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Calendar with week number

08/02/2024 admin Commenter Allez aux commentaires

The current calendar not allow to show week number, i have made somes update for show it like this (datepicker too)

you must create an attached property

 public static class CalendarHelper
 {
     #region ShowWeekNumber              
     public static bool GetShowWeekNumber(DependencyObject obj) => (bool)obj.GetValue(ShowWeekNumberProperty);
     public static void SetShowWeekNumber(DependencyObject obj, bool value) => obj.SetValue(ShowWeekNumberProperty, value);
     public static readonly DependencyProperty ShowWeekNumberProperty =
         DependencyProperty.RegisterAttached("ShowWeekNumber",
             typeof(bool),
             typeof(CalendarHelper),
             new PropertyMetadata(false
             , (ss, ee) =>
             {
                 if(ss is System.Windows.Controls.Calendar ca)
                 {
                     ca.Loaded += (s, e) =>
                     {
                         // get grid with name
                         var x = ca.FindChild<Grid>("PART_WeekNumber");                           
                         if (x != null)
                         {                               
                             EventHandler<CalendarDateChangedEventArgs> changed = (a, b) =>
                             {                                 
                                 // get first day of month
                                 var dref = new DateTime(ca.DisplayDate.Year, ca.DisplayDate.Month,1);
                                 // adjuste date if first days is monday
                                 if(dref.DayOfWeek == DayOfWeek.Monday)
                                 {
                                      dref = dref.AddDays(-1);
                                 }              
                                 x.Children.Clear();
                                 for (int row = 1; row <= 6; row++, dref= dref.AddDays(7))
                                 {
                                     var tb = new TextBlock()
                                     {
                                         Text = GetWeekNumber(dref).ToString(),
                                         FontSize = 10,
                                         Margin = new Thickness(0, -2, 0, 0),
                                         VerticalAlignment = VerticalAlignment.Center,
                                         HorizontalAlignment = HorizontalAlignment.Center,
                                         Foreground = Brushes.Gray,
                                     };
                                     Grid.SetRow(tb, row);
                                     x.Children.Add(tb);
                                 }
                             };
                             ca.DisplayDateChanged += (sss, eee) =>
                             {
                                 changed(null, null);
                             };
                             changed(null, null);                                
                         }
                     };
                 }
             }));
     #endregion

     public static int GetWeekNumber(DateTime from)
     {
         CultureInfo ciCurr = CultureInfo.CurrentCulture;
         return ciCurr.Calendar.GetWeekOfYear(from, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);            
     }

     public static T FindChild<T>(this DependencyObject parent, string childName) where T : DependencyObject
     {
         // Confirm parent and childName are valid. 
         if (parent == null) return null;

         T foundChild = null;
         Debug.WriteLine($"ELEMENT TYPE = {parent.GetType()} -> {(parent as FrameworkElement).Name} #{VisualTreeHelper.GetChildrenCount(parent)}");

         int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
         for (int i = 0; i < childrenCount; i++)
         {
             var child = VisualTreeHelper.GetChild(parent, i);
             // If the child is not of the request child type child
             T childType = child as T;
             if (childType == null)
             {
                 // recursively drill down the tree
                 foundChild = FindChild<T>(child, childName);

                 // If the child is found, break so we do not overwrite the found child. 
                 if (foundChild != null) break;
             }
             else if (!string.IsNullOrEmpty(childName))
             {
                 var frameworkElement = child as FrameworkElement;
                 // If the child's name is set for search
                 if (frameworkElement != null && frameworkElement.Name == childName)
                 {
                     // if the child's name is of the request name
                     foundChild = (T)child;
                     break;
                 }
                 else
                 {
                     // recursively drill down the tree
                     foundChild = FindChild<T>(child, childName);

                     // If the child is found, break so we do not overwrite the found child. 
                     if (foundChild != null) break;
                 }
             }
             else
             {
                 // child element found.
                 foundChild = (T)child;
                 break;
             }
         }

         return foundChild;
     }
 }

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public static class CalendarHelper

{

#region ShowWeekNumber

public static bool GetShowWeekNumber(DependencyObject obj) => (bool)obj.GetValue(ShowWeekNumberProperty);

public static void SetShowWeekNumber(DependencyObject obj, bool value) => obj.SetValue(ShowWeekNumberProperty, value);

public static readonly DependencyProperty ShowWeekNumberProperty =

DependencyProperty.RegisterAttached("ShowWeekNumber",

typeof(bool),

typeof(CalendarHelper),

new PropertyMetadata(false

, (ss, ee) =>

{

if(ss is System.Windows.Controls.Calendar ca)

{

ca.Loaded += (s, e) =>

{

// get grid with name

var x = ca.FindChild<Grid>("PART_WeekNumber");

if (x != null)

{

EventHandler<CalendarDateChangedEventArgs> changed = (a, b) =>

{

// get first day of month

var dref = new DateTime(ca.DisplayDate.Year, ca.DisplayDate.Month,1);

// adjuste date if first days is monday

if(dref.DayOfWeek == DayOfWeek.Monday)

{

dref = dref.AddDays(-1);

}

x.Children.Clear();

for (int row = 1; row <= 6; row++, dref= dref.AddDays(7))

{

var tb = new TextBlock()

{

Text = GetWeekNumber(dref).ToString(),

FontSize = 10,

Margin = new Thickness(0, -2, 0, 0),

VerticalAlignment = VerticalAlignment.Center,

HorizontalAlignment = HorizontalAlignment.Center,

Foreground = Brushes.Gray,

};

Grid.SetRow(tb, row);

x.Children.Add(tb);

}

};

ca.DisplayDateChanged += (sss, eee) =>

{

changed(null, null);

};

changed(null, null);

}

};

}

}));

#endregion

public static int GetWeekNumber(DateTime from)

{

CultureInfo ciCurr = CultureInfo.CurrentCulture;

return ciCurr.Calendar.GetWeekOfYear(from, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);

}

public static T FindChild<T>(this DependencyObject parent, string childName) where T : DependencyObject

{

// Confirm parent and childName are valid.

if (parent == null) return null;

T foundChild = null;

Debug.WriteLine($"ELEMENT TYPE = {parent.GetType()} -> {(parent as FrameworkElement).Name} #{VisualTreeHelper.GetChildrenCount(parent)}");

int childrenCount = VisualTreeHelper.GetChildrenCount(parent);

for (int i = 0; i < childrenCount; i++)

{

var child = VisualTreeHelper.GetChild(parent, i);

// If the child is not of the request child type child

T childType = child as T;

if (childType == null)

{

// recursively drill down the tree

foundChild = FindChild<T>(child, childName);

// If the child is found, break so we do not overwrite the found child.

if (foundChild != null) break;

}

else if (!string.IsNullOrEmpty(childName))

{

var frameworkElement = child as FrameworkElement;

// If the child's name is set for search

if (frameworkElement != null && frameworkElement.Name == childName)

{

// if the child's name is of the request name

foundChild = (T)child;

break;

}

else

{

// recursively drill down the tree

foundChild = FindChild<T>(child, childName);

// If the child is found, break so we do not overwrite the found child.

if (foundChild != null) break;

}

else

{

// child element found.

foundChild = (T)child;

break;

}

return foundChild;

}

and made corrections in style

  <!-- CALENDAR -->
  <Style TargetType="{x:Type Calendar}">
      <Setter Property="CalendarItemStyle"
              Value="{DynamicResource CalendarItemStyle1}" />
      <Setter Property="local:CalendarHelper.ShowWeekNumber"
              Value="true" />
  </Style>
  <!-- CALENDAR ITEM -->
  <Style x:Key="CalendarItemStyle1"
         TargetType="{x:Type CalendarItem}">
      <Setter Property="Margin"
              Value="0,3,0,3" />
      <Setter Property="Background"
              Value="green" />
      <Setter Property="Template">
          <Setter.Value>
              <ControlTemplate TargetType="{x:Type CalendarItem}">
                  <ControlTemplate.Resources>
                      <DataTemplate x:Key="{x:Static CalendarItem.DayTitleTemplateResourceKey}">
                          <TextBlock Foreground="#FF333333"
                                     FontFamily="Verdana"
                                     FontWeight="Bold"
                                     FontSize="9.5"
                                     HorizontalAlignment="Center"
                                     Margin="0,6,0,6"
                                     Text="{Binding}"
                                     VerticalAlignment="Center" />
                      </DataTemplate>
                  </ControlTemplate.Resources>
                  <Grid x:Name="PART_Root">
                      <Grid.Resources>
                          <SolidColorBrush x:Key="DisabledColor"
                                           Color="#A5FFFFFF" />
                      </Grid.Resources>
                      <VisualStateManager.VisualStateGroups>
                          <VisualStateGroup x:Name="CommonStates">
                              <VisualState x:Name="Normal" />
                              <VisualState x:Name="Disabled">
                                  <Storyboard>
                                      <DoubleAnimation Duration="0"
                                                       Storyboard.TargetName="PART_DisabledVisual"
                                                       To="1"
                                                       Storyboard.TargetProperty="Opacity" />
                                  </Storyboard>
                              </VisualState>
                          </VisualStateGroup>
                      </VisualStateManager.VisualStateGroups>
                      <Border Background="{TemplateBinding Background}"
                              BorderBrush="{TemplateBinding BorderBrush}"
                              BorderThickness="{TemplateBinding BorderThickness}"
                              CornerRadius="1">
                          <Border BorderBrush="#FFFFFFFF"
                                  BorderThickness="2"
                                  CornerRadius="1">
                              <Grid>
                                  <Grid.Resources>
                                      <ControlTemplate x:Key="PreviousButtonTemplate"
                                                       TargetType="{x:Type Button}">
                                          <Grid Cursor="Hand">
                                              <VisualStateManager.VisualStateGroups>
                                                  <VisualStateGroup x:Name="CommonStates">
                                                      <VisualState x:Name="Normal" />
                                                      <VisualState x:Name="MouseOver">
                                                          <Storyboard>
                                                              <ColorAnimation Duration="0"
                                                                              Storyboard.TargetName="path"
                                                                              To="#FF73A9D8"
                                                                              Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)" />
                                                          </Storyboard>
                                                      </VisualState>
                                                      <VisualState x:Name="Disabled">
                                                          <Storyboard>
                                                              <DoubleAnimation Duration="0"
                                                                               Storyboard.TargetName="path"
                                                                               To=".5"
                                                                               Storyboard.TargetProperty="(Shape.Fill).(Brush.Opacity)" />
                                                          </Storyboard>
                                                      </VisualState>
                                                  </VisualStateGroup>
                                              </VisualStateManager.VisualStateGroups>
                                              <Rectangle Fill="#11E5EBF1"
                                                         Opacity="1"
                                                         Stretch="Fill" />
                                              <Grid>
                                                  <Path x:Name="path"
                                                        Data="M288.75,232.25 L288.75,240.625 L283,236.625 z"
                                                        Fill="#FF333333"
                                                        HorizontalAlignment="Left"
                                                        Height="10"
                                                        Margin="14,-6,0,0"
                                                        Stretch="Fill"
                                                        VerticalAlignment="Center"
                                                        Width="6" />
                                              </Grid>
                                          </Grid>
                                      </ControlTemplate>
                                      <ControlTemplate x:Key="NextButtonTemplate"
                                                       TargetType="{x:Type Button}">
                                          <Grid Cursor="Hand">
                                              <VisualStateManager.VisualStateGroups>
                                                  <VisualStateGroup x:Name="CommonStates">
                                                      <VisualState x:Name="Normal" />
                                                      <VisualState x:Name="MouseOver">
                                                          <Storyboard>
                                                              <ColorAnimation Duration="0"
                                                                              Storyboard.TargetName="path"
                                                                              To="#FF73A9D8"
                                                                              Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)" />
                                                          </Storyboard>
                                                      </VisualState>
                                                      <VisualState x:Name="Disabled">
                                                          <Storyboard>
                                                              <DoubleAnimation Duration="0"
                                                                               Storyboard.TargetName="path"
                                                                               To=".5"
                                                                               Storyboard.TargetProperty="(Shape.Fill).(Brush.Opacity)" />
                                                          </Storyboard>
                                                      </VisualState>
                                                  </VisualStateGroup>
                                              </VisualStateManager.VisualStateGroups>
                                              <Rectangle Fill="#11E5EBF1"
                                                         Opacity="1"
                                                         Stretch="Fill" />
                                              <Grid>
                                                  <Path x:Name="path"
                                                        Data="M282.875,231.875 L282.875,240.375 L288.625,236 z"
                                                        Fill="#FF333333"
                                                        HorizontalAlignment="Right"
                                                        Height="10"
                                                        Margin="0,-6,14,0"
                                                        Stretch="Fill"
                                                        VerticalAlignment="Center"
                                                        Width="6" />
                                              </Grid>
                                          </Grid>
                                      </ControlTemplate>
                                      <ControlTemplate x:Key="HeaderButtonTemplate"
                                                       TargetType="{x:Type Button}">
                                          <Grid Cursor="Hand">
                                              <VisualStateManager.VisualStateGroups>
                                                  <VisualStateGroup x:Name="CommonStates">
                                                      <VisualState x:Name="Normal" />
                                                      <VisualState x:Name="MouseOver">
                                                          <Storyboard>
                                                              <ColorAnimation Duration="0"
                                                                              Storyboard.TargetName="buttonContent"
                                                                              To="#FF73A9D8"
                                                                              Storyboard.TargetProperty="(TextElement.Foreground).(SolidColorBrush.Color)" />
                                                          </Storyboard>
                                                      </VisualState>
                                                      <VisualState x:Name="Disabled">
                                                          <Storyboard>
                                                              <DoubleAnimation Duration="0"
                                                                               Storyboard.TargetName="buttonContent"
                                                                               To=".5"
                                                                               Storyboard.TargetProperty="Opacity" />
                                                          </Storyboard>
                                                      </VisualState>
                                                  </VisualStateGroup>
                                              </VisualStateManager.VisualStateGroups>
                                              <ContentPresenter x:Name="buttonContent"
                                                                ContentTemplate="{TemplateBinding ContentTemplate}"
                                                                Content="{TemplateBinding Content}"
                                                                TextElement.Foreground="#FF333333"
                                                                HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                                                Margin="1,4,1,9"
                                                                VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
                                          </Grid>
                                      </ControlTemplate>
                                  </Grid.Resources>
                                  <Grid.ColumnDefinitions>
                                      <ColumnDefinition Width="Auto" />
                                      <ColumnDefinition Width="Auto" />
                                      <ColumnDefinition Width="Auto" />
                                  </Grid.ColumnDefinitions>
                                  <Grid.RowDefinitions>
                                      <RowDefinition Height="Auto" />
                                      <RowDefinition Height="*" />
                                  </Grid.RowDefinitions>
                                  <Button x:Name="PART_PreviousButton"
                                          Grid.Column="0"
                                          Focusable="False"
                                          HorizontalAlignment="Left"
                                          Height="20"
                                          Grid.Row="0"
                                          Template="{StaticResource PreviousButtonTemplate}"
                                          Width="28" />
                                  <Button x:Name="PART_HeaderButton"
                                          Grid.Column="1"
                                          Focusable="False"
                                          FontWeight="Bold"
                                          FontSize="10.5"
                                          HorizontalAlignment="Center"
                                          Grid.Row="0"
                                          Template="{StaticResource HeaderButtonTemplate}"
                                          VerticalAlignment="Center" />
                                  <Button x:Name="PART_NextButton"
                                          Grid.Column="2"
                                          Focusable="False"
                                          HorizontalAlignment="Right"
                                          Height="20"
                                          Grid.Row="0"
                                          Template="{StaticResource NextButtonTemplate}"
                                          Width="28" />
                                  <Grid Grid.ColumnSpan="3"
                                        HorizontalAlignment="Center"
                                        Margin="6,-1,6,6"
                                        Grid.Row="1"
                                        x:Name="PART_MonthView0"
                                        Grid.IsSharedSizeScope="true">
                                      <Border x:Name="br"
                                          Grid.Column="0"
                                              Margin="6 20 0 10"
                                              BorderThickness="1 0 0 0"
                                              BorderBrush="gray"
                                              Visibility="Collapsed"/>
                                      <Grid x:Name="PART_WeekNumber"
                                            Visibility="Collapsed"
                                            Background="Transparent"
                                            Width="10"
                                            VerticalAlignment="Stretch"
                                            HorizontalAlignment="Left"
                                            Margin=" -7 0 0 0">
                                          <Grid.RowDefinitions>
                                              <RowDefinition Height="Auto"
                                                             SharedSizeGroup="A" />
                                              <RowDefinition Height="Auto"
                                                             SharedSizeGroup="B" />
                                              <RowDefinition Height="Auto"
                                                             SharedSizeGroup="C" />
                                              <RowDefinition Height="Auto"
                                                             SharedSizeGroup="D" />
                                              <RowDefinition Height="Auto"
                                                             SharedSizeGroup="E" />
                                              <RowDefinition Height="Auto"
                                                             SharedSizeGroup="F" />
                                              <RowDefinition Height="Auto"
                                                             SharedSizeGroup="G" />
                                          </Grid.RowDefinitions>
                                          <Rectangle Fill="Green"
                                                     Grid.Row="4"
                                                     Height="10"
                                                     HorizontalAlignment="Stretch" />
                                      </Grid>
                                      <Grid x:Name="PART_MonthView"
                                            Grid.ColumnSpan="3"
                                            HorizontalAlignment="Center"
                                            Margin="6,-1,6,6"
                                            Grid.Row="1"
                                            Visibility="Visible">
                                          <Grid.ColumnDefinitions>
                                              <ColumnDefinition Width="Auto" />
                                              <ColumnDefinition Width="Auto" />
                                              <ColumnDefinition Width="Auto" />
                                              <ColumnDefinition Width="Auto" />
                                              <ColumnDefinition Width="Auto" />
                                              <ColumnDefinition Width="Auto" />
                                              <ColumnDefinition Width="Auto" />
                                          </Grid.ColumnDefinitions>
                                          <Grid.RowDefinitions>
                                              <RowDefinition Height="Auto"
                                                             SharedSizeGroup="A" />
                                              <RowDefinition Height="Auto"
                                                             SharedSizeGroup="B" />
                                              <RowDefinition Height="Auto"
                                                             SharedSizeGroup="C" />
                                              <RowDefinition Height="Auto"
                                                             SharedSizeGroup="D" />
                                              <RowDefinition Height="Auto"
                                                             SharedSizeGroup="E" />
                                              <RowDefinition Height="Auto"
                                                             SharedSizeGroup="F" />
                                              <RowDefinition Height="Auto"
                                                             SharedSizeGroup="G" />
                                          </Grid.RowDefinitions>
                                      </Grid>
                                  </Grid>
                                  <Grid x:Name="PART_YearView"
                                        Grid.ColumnSpan="3"
                                        HorizontalAlignment="Center"
                                        Margin="6,-3,7,6"
                                        Grid.Row="1"
                                        Visibility="Hidden">
                                      <Grid.ColumnDefinitions>
                                          <ColumnDefinition Width="Auto" />
                                          <ColumnDefinition Width="Auto" />
                                          <ColumnDefinition Width="Auto" />
                                          <ColumnDefinition Width="Auto" />
                                      </Grid.ColumnDefinitions>
                                      <Grid.RowDefinitions>
                                          <RowDefinition Height="Auto" />
                                          <RowDefinition Height="Auto" />
                                          <RowDefinition Height="Auto" />
                                      </Grid.RowDefinitions>
                                  </Grid>
                              </Grid>
                          </Border>
                      </Border>
                      <Rectangle x:Name="PART_DisabledVisual"
                                 Fill="{StaticResource DisabledColor}"
                                 Opacity="0"
                                 RadiusX="2"
                                 RadiusY="2"
                                 Stroke="{StaticResource DisabledColor}"
                                 Stretch="Fill"
                                 StrokeThickness="1"
                                 Visibility="Collapsed" />
                  </Grid>
                  <ControlTemplate.Triggers>
                      <Trigger Property="IsEnabled"
                               Value="False">
                          <Setter Property="Visibility"
                                  TargetName="PART_DisabledVisual"
                                  Value="Visible" />
                      </Trigger>
                      <DataTrigger Binding="{Binding DisplayMode, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Calendar}}}"
                                   Value="Year">
                          <Setter Property="Visibility"
                                  TargetName="PART_MonthView0"
                                  Value="Hidden" />
                          <Setter Property="Visibility"
                                  TargetName="PART_YearView"
                                  Value="Visible" />
                      </DataTrigger>
                      <DataTrigger Binding="{Binding DisplayMode, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Calendar}}}"
                                   Value="Decade">
                          <Setter Property="Visibility"
                                  TargetName="PART_MonthView0"
                                  Value="Hidden" />
                          <Setter Property="Visibility"
                                  TargetName="PART_YearView"
                                  Value="Visible" />
                      </DataTrigger>
                      <DataTrigger Binding="{Binding Path=(local:CalendarHelper.ShowWeekNumber), RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Calendar}}}"
                                   Value="true">
                          <Setter Property="Visibility"
                                  TargetName="PART_WeekNumber"
                                  Value="Visible" />
                          <Setter Property="Visibility"
                                  TargetName="br"
                                  Value="Visible" />
                      </DataTrigger>
                  </ControlTemplate.Triggers>
              </ControlTemplate>
          </Setter.Value>
      </Setter>
  </Style>
 <!-- DATEPICKER -->
 <Style TargetType="{x:Type DatePicker}">
     <Setter Property="CalendarStyle"
             Value="{DynamicResource {x:Type Calendar}}" />
 </Style>

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<Setter Property="CalendarItemStyle"

Value="{DynamicResource CalendarItemStyle1}" />

<Setter Property="local:CalendarHelper.ShowWeekNumber"

Value="true" />

</Style>

<Style x:Key="CalendarItemStyle1"

TargetType="{x:Type CalendarItem}">

<Setter Property="Margin"

Value="0,3,0,3" />

<Setter Property="Background"

Value="green" />

<Setter.Value>

<ControlTemplate.Resources>

<TextBlock Foreground="#FF333333"

FontFamily="Verdana"

FontWeight="Bold"

FontSize="9.5"

HorizontalAlignment="Center"

Margin="0,6,0,6"

Text="{Binding}"

VerticalAlignment="Center" />

</DataTemplate>

</ControlTemplate.Resources>

<Grid.Resources>

<SolidColorBrush x:Key="DisabledColor"

Color="#A5FFFFFF" />

</Grid.Resources>

<VisualStateManager.VisualStateGroups>

<DoubleAnimation Duration="0"

Storyboard.TargetName="PART_DisabledVisual"

To="1"

Storyboard.TargetProperty="Opacity" />

</Storyboard>

</VisualState>

</VisualStateGroup>

</VisualStateManager.VisualStateGroups>

<Border Background="{TemplateBinding Background}"

BorderBrush="{TemplateBinding BorderBrush}"

BorderThickness="{TemplateBinding BorderThickness}"

CornerRadius="1">

<Border BorderBrush="#FFFFFFFF"

BorderThickness="2"

CornerRadius="1">

<Grid>

<Grid.Resources>

<ControlTemplate x:Key="PreviousButtonTemplate"

TargetType="{x:Type Button}">

<VisualStateManager.VisualStateGroups>

<ColorAnimation Duration="0"

Storyboard.TargetName="path"

To="#FF73A9D8"

Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)" />

</Storyboard>

</VisualState>

<DoubleAnimation Duration="0"

Storyboard.TargetName="path"

To=".5"

Storyboard.TargetProperty="(Shape.Fill).(Brush.Opacity)" />

</Storyboard>

</VisualState>

</VisualStateGroup>

</VisualStateManager.VisualStateGroups>

<Rectangle Fill="#11E5EBF1"

Opacity="1"

Stretch="Fill" />

<Grid>

<Path x:Name="path"

Data="M288.75,232.25 L288.75,240.625 L283,236.625 z"

Fill="#FF333333"

HorizontalAlignment="Left"

Height="10"

Margin="14,-6,0,0"

Stretch="Fill"

VerticalAlignment="Center"

Width="6" />

</Grid>

</ControlTemplate>

<ControlTemplate x:Key="NextButtonTemplate"

TargetType="{x:Type Button}">

<VisualStateManager.VisualStateGroups>

<ColorAnimation Duration="0"

Storyboard.TargetName="path"

To="#FF73A9D8"

Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)" />

</Storyboard>

</VisualState>

<DoubleAnimation Duration="0"

Storyboard.TargetName="path"

To=".5"

Storyboard.TargetProperty="(Shape.Fill).(Brush.Opacity)" />

</Storyboard>

</VisualState>

</VisualStateGroup>

</VisualStateManager.VisualStateGroups>

<Rectangle Fill="#11E5EBF1"

Opacity="1"

Stretch="Fill" />

<Grid>

<Path x:Name="path"

Data="M282.875,231.875 L282.875,240.375 L288.625,236 z"

Fill="#FF333333"

HorizontalAlignment="Right"

Height="10"

Margin="0,-6,14,0"

Stretch="Fill"

VerticalAlignment="Center"

Width="6" />

</Grid>

</ControlTemplate>

<ControlTemplate x:Key="HeaderButtonTemplate"

TargetType="{x:Type Button}">

<VisualStateManager.VisualStateGroups>

<ColorAnimation Duration="0"

Storyboard.TargetName="buttonContent"

To="#FF73A9D8"

Storyboard.TargetProperty="(TextElement.Foreground).(SolidColorBrush.Color)" />

</Storyboard>

</VisualState>

<DoubleAnimation Duration="0"

Storyboard.TargetName="buttonContent"

To=".5"

Storyboard.TargetProperty="Opacity" />

</Storyboard>

</VisualState>

</VisualStateGroup>

</VisualStateManager.VisualStateGroups>

<ContentPresenter x:Name="buttonContent"

ContentTemplate="{TemplateBinding ContentTemplate}"

Content="{TemplateBinding Content}"

TextElement.Foreground="#FF333333"

HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"

Margin="1,4,1,9"

VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />

</Grid>

</ControlTemplate>

</Grid.Resources>

<Grid.ColumnDefinitions>

</Grid.ColumnDefinitions>

<Grid.RowDefinitions>

</Grid.RowDefinitions>

<Button x:Name="PART_PreviousButton"

Grid.Column="0"

Focusable="False"

HorizontalAlignment="Left"

Height="20"

Grid.Row="0"

Template="{StaticResource PreviousButtonTemplate}"

Width="28" />

<Button x:Name="PART_HeaderButton"

Grid.Column="1"

Focusable="False"

FontWeight="Bold"

FontSize="10.5"

HorizontalAlignment="Center"

Grid.Row="0"

Template="{StaticResource HeaderButtonTemplate}"

VerticalAlignment="Center" />

<Button x:Name="PART_NextButton"

Grid.Column="2"

Focusable="False"

HorizontalAlignment="Right"

Height="20"

Grid.Row="0"

Template="{StaticResource NextButtonTemplate}"

Width="28" />

<Grid Grid.ColumnSpan="3"

HorizontalAlignment="Center"

Margin="6,-1,6,6"

Grid.Row="1"

x:Name="PART_MonthView0"

Grid.IsSharedSizeScope="true">

<Border x:Name="br"

Grid.Column="0"

Margin="6 20 0 10"

BorderThickness="1 0 0 0"

BorderBrush="gray"

Visibility="Collapsed"/>

<Grid x:Name="PART_WeekNumber"

Visibility="Collapsed"

Background="Transparent"

Width="10"

VerticalAlignment="Stretch"

HorizontalAlignment="Left"

Margin=" -7 0 0 0">

<Grid.RowDefinitions>

<RowDefinition Height="Auto"

SharedSizeGroup="A" />

<RowDefinition Height="Auto"

SharedSizeGroup="B" />

<RowDefinition Height="Auto"

SharedSizeGroup="C" />

<RowDefinition Height="Auto"

SharedSizeGroup="D" />

<RowDefinition Height="Auto"

SharedSizeGroup="E" />

<RowDefinition Height="Auto"

SharedSizeGroup="F" />

<RowDefinition Height="Auto"

SharedSizeGroup="G" />

</Grid.RowDefinitions>

<Rectangle Fill="Green"

Grid.Row="4"

Height="10"

HorizontalAlignment="Stretch" />

</Grid>

<Grid x:Name="PART_MonthView"

Grid.ColumnSpan="3"

HorizontalAlignment="Center"

Margin="6,-1,6,6"

Grid.Row="1"

Visibility="Visible">

<Grid.ColumnDefinitions>

</Grid.ColumnDefinitions>

<Grid.RowDefinitions>

<RowDefinition Height="Auto"

SharedSizeGroup="A" />

<RowDefinition Height="Auto"

SharedSizeGroup="B" />

<RowDefinition Height="Auto"

SharedSizeGroup="C" />

<RowDefinition Height="Auto"

SharedSizeGroup="D" />

<RowDefinition Height="Auto"

SharedSizeGroup="E" />

<RowDefinition Height="Auto"

SharedSizeGroup="F" />

<RowDefinition Height="Auto"

SharedSizeGroup="G" />

</Grid.RowDefinitions>

</Grid>

<Grid x:Name="PART_YearView"

Grid.ColumnSpan="3"

HorizontalAlignment="Center"

Margin="6,-3,7,6"

Grid.Row="1"

Visibility="Hidden">

<Grid.ColumnDefinitions>

</Grid.ColumnDefinitions>

<Grid.RowDefinitions>

</Grid.RowDefinitions>

</Grid>

</Border>

<Rectangle x:Name="PART_DisabledVisual"

Fill="{StaticResource DisabledColor}"

Opacity="0"

RadiusX="2"

RadiusY="2"

Stroke="{StaticResource DisabledColor}"

Stretch="Fill"

StrokeThickness="1"

Visibility="Collapsed" />

</Grid>

<ControlTemplate.Triggers>

<Trigger Property="IsEnabled"

Value="False">

<Setter Property="Visibility"

TargetName="PART_DisabledVisual"

Value="Visible" />

</Trigger>

<DataTrigger Binding="{Binding DisplayMode, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Calendar}}}"

Value="Year">

<Setter Property="Visibility"

TargetName="PART_MonthView0"

Value="Hidden" />

<Setter Property="Visibility"

TargetName="PART_YearView"

Value="Visible" />

</DataTrigger>

<DataTrigger Binding="{Binding DisplayMode, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Calendar}}}"

Value="Decade">

<Setter Property="Visibility"

TargetName="PART_MonthView0"

Value="Hidden" />

<Setter Property="Visibility"

TargetName="PART_YearView"

Value="Visible" />

</DataTrigger>

<DataTrigger Binding="{Binding Path=(local:CalendarHelper.ShowWeekNumber), RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Calendar}}}"

Value="true">

<Setter Property="Visibility"

TargetName="PART_WeekNumber"

Value="Visible" />

<Setter Property="Visibility"

TargetName="br"

Value="Visible" />

</DataTrigger>

</ControlTemplate.Triggers>

</ControlTemplate>

</Setter.Value>

</Setter>

</Style>

<Setter Property="CalendarStyle"

Value="{DynamicResource {x:Type Calendar}}" />

</Style>

and usage like this (with the new style you can disable show week number)

 <DatePicker HorizontalAlignment="Left"
             Height="29"             
             VerticalAlignment="Top"
             Width="215"
             Margin="10,10,0,0" />
 <Calendar HorizontalAlignment="Left"
           Margin="250,10,0,0"
           VerticalAlignment="Top" />
 <Calendar HorizontalAlignment="Left"
           Margin="452,10,0,0"
           VerticalAlignment="Top"
           local:CalendarHelper.ShowWeekNumber="false" />

<DatePicker HorizontalAlignment="Left"

Height="29"

VerticalAlignment="Top"

Width="215"

Margin="10,10,0,0" />

<Calendar HorizontalAlignment="Left"

Margin="250,10,0,0"

VerticalAlignment="Top" />

<Calendar HorizontalAlignment="Left"

Margin="452,10,0,0"

VerticalAlignment="Top"

local:CalendarHelper.ShowWeekNumber="false" />

WARNING : for DatePicker is necessary to change style of CalendarItem for connect to dynamicresource of restyled style
CalendarStyle= »{DynamicResource {x:Type Calendar}} » or using redefine style of DatePicker

  <!--#region Usage-->
  <DatePicker HorizontalAlignment="Left"
              Height="29"
              CalendarStyle="{DynamicResource {x:Type Calendar}}"
              VerticalAlignment="Top"
              Width="215"
              Margin="10,10,0,0" />
  <!--#endregion-->
or
  <!--#region redefine style of DatePicker-->
  <Style TargetType="{x:Type DatePicker}">
      <Setter Property="CalendarStyle"
              Value="{DynamicResource {x:Type Calendar}}" />
  </Style>
  <!--#endregion-->

<DatePicker HorizontalAlignment="Left"

Height="29"

CalendarStyle="{DynamicResource {x:Type Calendar}}"

VerticalAlignment="Top"

Width="215"

Margin="10,10,0,0" />

<Setter Property="CalendarStyle"

Value="{DynamicResource {x:Type Calendar}}" />

</Style>

UPDATE : for getting first day of a week when clicking on week number

public static class CalendarHelper
{
    #region ShowWeekNumber              
    public static bool GetShowWeekNumber(DependencyObject obj) => (bool)obj.GetValue(ShowWeekNumberProperty);
    public static void SetShowWeekNumber(DependencyObject obj, bool value) => obj.SetValue(ShowWeekNumberProperty, value);
    public static readonly DependencyProperty ShowWeekNumberProperty =
        DependencyProperty.RegisterAttached("ShowWeekNumber",
            typeof(bool),
            typeof(CalendarHelper),
            new PropertyMetadata(false
            , (ss, ee) =>
            {
                if (ss is System.Windows.Controls.Calendar ca)
                {
                    ca.Loaded += (s, e) =>
                    {
                        // get grid with name
                        var x = ca.FindChild<Grid>("PART_WeekNumber");
                        if (x != null)
                        {
                            EventHandler<CalendarDateChangedEventArgs> changed = (a, b) =>
                            {
                                // get first day of month
                                var dref = new DateTime(ca.DisplayDate.Year, ca.DisplayDate.Month, 1);
                                // adjuste date if first days is monday
                                if (dref.DayOfWeek == DayOfWeek.Monday)
                                {
                                    dref = dref.AddDays(-1);
                                }
                                x.Children.Clear();
                                for (int row = 1; row <= 6; row++, dref = dref.AddDays(7))
                                {
                                    var tb = new TextBlock()
                                    {
                                        Text = GetWeekNumber(dref).ToString(),
                                        Background = Brushes.Transparent,
                                        Width = 12,
                                        TextAlignment = TextAlignment.Center,
                                        Tag = dref.Year,
                                        FontSize = 10,
                                        Margin = new Thickness(0, -2, 0, 0),
                                        VerticalAlignment = VerticalAlignment.Center,
                                        HorizontalAlignment = HorizontalAlignment.Center,
                                        Foreground = Brushes.Gray,
                                    };
                                    tb.MouseLeftButtonDown += (ss, ee) =>
                                    {
                                        if (GetClickWeekCommand(ca) is ICommand ic)
                                        {
                                            if (ic.CanExecute(null))
                                            {
                                                var date = GetFirstDayOfWeek(
                                                   (int)tb.Tag,
                                                   int.Parse(tb.Text)
                                                   );
                                                ic.Execute(date);                                                   
                                            }
                                        }
                                    };
                                    Grid.SetRow(tb, row);
                                    x.Children.Add(tb);
                                }
                            };
                            ca.DisplayDateChanged += (sss, eee) =>
                            {
                                changed(null, null);
                            };
                            changed(null, null);
                        }
                    };
                }
            }));
    #endregion

    #region ClickWeekCommand              
    public static ICommand GetClickWeekCommand(DependencyObject obj) => (ICommand)obj.GetValue(ClickWeekCommandProperty);
    public static void SetClickWeekCommand(DependencyObject obj, int value) => obj.SetValue(ClickWeekCommandProperty, value);
    public static readonly DependencyProperty ClickWeekCommandProperty =
        DependencyProperty.RegisterAttached("ClickWeekCommand",
            typeof(ICommand),
            typeof(CalendarHelper),
            new PropertyMetadata(null
            //,(ss,ee) => { }
            ));
    #endregion

    #region Static methods

    public static int GetWeekNumber(DateTime from)
    {
        CultureInfo ciCurr = CultureInfo.CurrentCulture;
        return ciCurr.Calendar.GetWeekOfYear(from, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
    }

    public static T FindChild<T>(this DependencyObject parent, string childName) where T : DependencyObject
    {
        // Confirm parent and childName are valid. 
        if (parent == null) return null;

        T foundChild = null;
        Debug.WriteLine($"ELEMENT TYPE = {parent.GetType()} -> {(parent as FrameworkElement).Name} #{VisualTreeHelper.GetChildrenCount(parent)}");

        int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
        for (int i = 0; i < childrenCount; i++)
        {
            var child = VisualTreeHelper.GetChild(parent, i);
            // If the child is not of the request child type child
            T childType = child as T;
            if (childType == null)
            {
                // recursively drill down the tree
                foundChild = FindChild<T>(child, childName);

                // If the child is found, break so we do not overwrite the found child. 
                if (foundChild != null) break;
            }
            else if (!string.IsNullOrEmpty(childName))
            {
                var frameworkElement = child as FrameworkElement;
                // If the child's name is set for search
                if (frameworkElement != null && frameworkElement.Name == childName)
                {
                    // if the child's name is of the request name
                    foundChild = (T)child;
                    break;
                }
                else
                {
                    // recursively drill down the tree
                    foundChild = FindChild<T>(child, childName);

                    // If the child is found, break so we do not overwrite the found child. 
                    if (foundChild != null) break;
                }
            }
            else
            {
                // child element found.
                foundChild = (T)child;
                break;
            }
        }

        return foundChild;
    }

    static DateTime GetFirstDayOfWeek(int year, int weekNumber)
    {
        DateTime jan1 = new DateTime(year, 1, 1);
        DateTime firstDayOfYear = jan1.AddDays(-((int)jan1.DayOfWeek - 1)); // Calculate the first Monday of the year
        int daysToAdd = (weekNumber - 1) * 7;
        DateTime result = firstDayOfYear.AddDays(daysToAdd);
        Debug.WriteLine($"First day of week {weekNumber} of year {year} is {result.ToShortDateString()}");
        return result;
    }

    #endregion

}

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public static class CalendarHelper

{

#region ShowWeekNumber

public static bool GetShowWeekNumber(DependencyObject obj) => (bool)obj.GetValue(ShowWeekNumberProperty);

public static void SetShowWeekNumber(DependencyObject obj, bool value) => obj.SetValue(ShowWeekNumberProperty, value);

public static readonly DependencyProperty ShowWeekNumberProperty =

DependencyProperty.RegisterAttached("ShowWeekNumber",

typeof(bool),

typeof(CalendarHelper),

new PropertyMetadata(false

, (ss, ee) =>

{

if (ss is System.Windows.Controls.Calendar ca)

{

ca.Loaded += (s, e) =>

{

// get grid with name

var x = ca.FindChild<Grid>("PART_WeekNumber");

if (x != null)

{

EventHandler<CalendarDateChangedEventArgs> changed = (a, b) =>

{

// get first day of month

var dref = new DateTime(ca.DisplayDate.Year, ca.DisplayDate.Month, 1);

// adjuste date if first days is monday

if (dref.DayOfWeek == DayOfWeek.Monday)

{

dref = dref.AddDays(-1);

}

x.Children.Clear();

for (int row = 1; row <= 6; row++, dref = dref.AddDays(7))

{

var tb = new TextBlock()

{

Text = GetWeekNumber(dref).ToString(),

Background = Brushes.Transparent,

Width = 12,

TextAlignment = TextAlignment.Center,

Tag = dref.Year,

FontSize = 10,

Margin = new Thickness(0, -2, 0, 0),

VerticalAlignment = VerticalAlignment.Center,

HorizontalAlignment = HorizontalAlignment.Center,

Foreground = Brushes.Gray,

};

tb.MouseLeftButtonDown += (ss, ee) =>

{

if (GetClickWeekCommand(ca) is ICommand ic)

{

if (ic.CanExecute(null))

{

var date = GetFirstDayOfWeek(

(int)tb.Tag,

int.Parse(tb.Text)

);

ic.Execute(date);

}

};

Grid.SetRow(tb, row);

x.Children.Add(tb);

}

};

ca.DisplayDateChanged += (sss, eee) =>

{

changed(null, null);

};

changed(null, null);

}

};

}

}));

#endregion

#region ClickWeekCommand

public static ICommand GetClickWeekCommand(DependencyObject obj) => (ICommand)obj.GetValue(ClickWeekCommandProperty);

public static void SetClickWeekCommand(DependencyObject obj, int value) => obj.SetValue(ClickWeekCommandProperty, value);

public static readonly DependencyProperty ClickWeekCommandProperty =

DependencyProperty.RegisterAttached("ClickWeekCommand",

typeof(ICommand),

typeof(CalendarHelper),

new PropertyMetadata(null

//,(ss,ee) => { }

));

#endregion

#region Static methods

public static int GetWeekNumber(DateTime from)

{

CultureInfo ciCurr = CultureInfo.CurrentCulture;

return ciCurr.Calendar.GetWeekOfYear(from, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);

}

public static T FindChild<T>(this DependencyObject parent, string childName) where T : DependencyObject

{

// Confirm parent and childName are valid.

if (parent == null) return null;

T foundChild = null;

Debug.WriteLine($"ELEMENT TYPE = {parent.GetType()} -> {(parent as FrameworkElement).Name} #{VisualTreeHelper.GetChildrenCount(parent)}");

int childrenCount = VisualTreeHelper.GetChildrenCount(parent);

for (int i = 0; i < childrenCount; i++)

{

var child = VisualTreeHelper.GetChild(parent, i);

// If the child is not of the request child type child

T childType = child as T;

if (childType == null)

{

// recursively drill down the tree

foundChild = FindChild<T>(child, childName);

// If the child is found, break so we do not overwrite the found child.

if (foundChild != null) break;

}

else if (!string.IsNullOrEmpty(childName))

{

var frameworkElement = child as FrameworkElement;

// If the child's name is set for search

if (frameworkElement != null && frameworkElement.Name == childName)

{

// if the child's name is of the request name

foundChild = (T)child;

break;

}

else

{

// recursively drill down the tree

foundChild = FindChild<T>(child, childName);

// If the child is found, break so we do not overwrite the found child.

if (foundChild != null) break;

}

else

{

// child element found.

foundChild = (T)child;

break;

}

return foundChild;

}

static DateTime GetFirstDayOfWeek(int year, int weekNumber)

{

DateTime jan1 = new DateTime(year, 1, 1);

DateTime firstDayOfYear = jan1.AddDays(-((int)jan1.DayOfWeek - 1)); // Calculate the first Monday of the year

int daysToAdd = (weekNumber - 1) * 7;

DateTime result = firstDayOfYear.AddDays(daysToAdd);

Debug.WriteLine($"First day of week {weekNumber} of year {year} is {result.ToShortDateString()}");

return result;

}

#endregion

}

if CalendarHelper.ClickWeekCommand is define you receive first day of week in command

like this

 <Calendar HorizontalAlignment="Left"
           VerticalAlignment="Top"
           uchelper:CalendarHelper.ClickWeekCommand="{Binding ClickWeekCommand}"
           Margin="248,23,0,0" />

<Calendar HorizontalAlignment="Left"

VerticalAlignment="Top"

uchelper:CalendarHelper.ClickWeekCommand="{Binding ClickWeekCommand}"

Margin="248,23,0,0" />

and using whith this command

 #region ClickWeek (COMMAND)
 RelayCommand _ClickWeekCommand;
 public ICommand ClickWeekCommand
 {
     get
     {
         if (_ClickWeekCommand == null)
         {
             _ClickWeekCommand = new RelayCommand(param =>
                 {
                     if(param is DateTime dt)
                     {
                         Debug.WriteLine($"First day of week = {dt.ToShortDateString()}");
                     }
                 },
                 param => true);
         }
         return _ClickWeekCommand;
     }
 }
 #endregion

#region ClickWeek (COMMAND)

RelayCommand _ClickWeekCommand;

public ICommand ClickWeekCommand

{

get

{

if (_ClickWeekCommand == null)

{

_ClickWeekCommand = new RelayCommand(param =>

{

if(param is DateTime dt)

{

Debug.WriteLine($"First day of week = {dt.ToShortDateString()}");

}

param => true);

}

return _ClickWeekCommand;

}

#endregion

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