Column HeaderStyle target type

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C#

DataGridColumnHeader header = new DataGridColumnHeader();
            Style headerstyle = new System.Windows.Style();
            headerstyle.TargetType = typeof(DataGridColumnHeader);
            Setter setter = new Setter();        
            Setter setter1 = new Setter();
            Setter setter2 = new Setter();
            setter.Property = FontSizeProperty;
            FontSize = 10;
            setter.Value = FontSize;
            headerstyle.Setters.Add(setter);
            setter1.Property = ForegroundProperty;
            Foreground = Brushes.BlueViolet;
            setter1.Value = Foreground;
            headerstyle.Setters.Add(setter1);
            Setter setter3 = new Setter();
            LinearGradientBrush lb = new LinearGradientBrush();
            Point startpoint = new Point(0.5, 0);
            Point endpoint = new Point(1, 1);
            lb.StartPoint = startpoint;
            lb.EndPoint = endpoint;
            GradientStop gst = new GradientStop();
            lb.GradientStops.Add(new GradientStop(Colors.Black, 0.0));
            lb.GradientStops.Add(new GradientStop(Colors.Orange, 0.5));
            lb.GradientStops.Add(new GradientStop(Colors.Green, 1.0));
            setter3.Property = BackgroundProperty;
            setter3.Value = lb;
            headerstyle.Setters.Add(setter3);

            dataGrid1.ColumnHeaderStyle = headerstyle;

what is wrong with this . while executing it gives error saying target mismatch .

DataGridColumnHeader' TargetType does not match type of element 'DataGridColumnHeader'.

i am attaching the corresponding XAML file

HTML

<dg:DataGrid.Columns>

                          <dg:DataGridTextColumn Header="AuthorID" FontWeight="Black" Foreground="Red"
                                     FontSize="16" FontStyle="Italic"
                                     CanUserReorder="True"
                                     CanUserSort="True" SortDirection="Ascending" Binding="{Binding Path=AuthorID}">
                              <dg:DataGridTextColumn.ElementStyle>
                                  <Style TargetType="TextBlock">
                                      <Setter Property="TextAlignment" Value="Center" />
                                  </Style>
                              </dg:DataGridTextColumn.ElementStyle>
                              <dg:DataGridTextColumn.EditingElementStyle>
                                  <Style TargetType="TextBox">
                                      <Setter Property="TextWrapping" Value="Wrap" />
                                      <Setter Property="AcceptsReturn" Value="true" />
                                  </Style>
                              </dg:DataGridTextColumn.EditingElementStyle>
                              <dg:DataGridColumn.HeaderStyle>

                                  <Style TargetType="{x:Type dg:DataGridColumnHeader}">
                                      <Setter Property="Background" >
                                          <Setter.Value>
                                              <LinearGradientBrush EndPoint="1,1" StartPoint="0.5,0" SpreadMethod="Pad">
                                                  <GradientStop Color="Bisque" Offset="0" />
                                                  <GradientStop Color="Cyan" Offset="1" />
                                              </LinearGradientBrush>
                                          </Setter.Value>
                                      </Setter>
                                      <Setter Property="Foreground" Value="Black" />
                                      <Setter Property="FontSize" Value="20" />
                                      <Setter Property="HorizontalContentAlignment" Value="Center" />
                                      <Setter Property="BorderBrush" Value="yellow"/>
                                      <Setter Property="BorderThickness" Value="2,2,2,2"/>

                                  </Style>
                              </dg:DataGridColumn.HeaderStyle>
                          </dg:DataGridTextColumn>
                          <dg:DataGridTextColumn Header="FirstName" FontWeight="Bold" Foreground="DarkGreen" FontSize="16" FontStyle="Italic"
                                     CanUserSort="False" Binding="{Binding Path=FirstName}">
                              <dg:DataGridTextColumn.ElementStyle>
                                  <Style TargetType="TextBlock">
                                      <Setter Property="TextAlignment" Value="Center" />
                                  </Style>
                              </dg:DataGridTextColumn.ElementStyle>
                              <dg:DataGridTextColumn.EditingElementStyle>
                                  <Style TargetType="TextBox">
                                      <Setter Property="TextWrapping" Value="Wrap" />
                                      <Setter Property="AcceptsReturn" Value="true" />
                                  </Style>
                              </dg:DataGridTextColumn.EditingElementStyle>
                              <dg:DataGridColumn.HeaderStyle>
                                  <Style TargetType="{x:Type dg:DataGridColumnHeader}">

                                      <Setter Property="Background" >
                                          <Setter.Value>
                                              <LinearGradientBrush EndPoint="1,1" StartPoint="0.5,0" SpreadMethod="Pad">
                                                  <GradientStop Color="Lavender" Offset="0" />
                                                  <GradientStop Color="BlanchedAlmond" Offset="1" />
                                              </LinearGradientBrush>
                                          </Setter.Value>
                                      </Setter>
                                      <Setter Property="Foreground" Value="Black" />
                                      <Setter Property="FontSize" Value="20" />
                                      <Setter Property="HorizontalContentAlignment" Value="Center" />
                                      <Setter Property="Width" Value="Auto" />
                                      <Setter Property="BorderBrush" Value="Yellow"/>
                                      <Setter Property="BorderThickness" Value="2,2,2,2"/>
                                  </Style>
                              </dg:DataGridColumn.HeaderStyle>
                          </dg:DataGridTextColumn>
                          <dg:DataGridTextColumn Header="LastName" FontWeight="Bold" Foreground="OrangeRed" FontSize="16" FontStyle="Italic"
                                     CanUserSort="False" Binding="{Binding Path=LastName}">
                              <dg:DataGridTextColumn.ElementStyle>
                                  <Style TargetType="TextBlock">
                                      <Setter Property="TextAlignment" Value="Center" />
                                  </Style>
                              </dg:DataGridTextColumn.ElementStyle>
                              <dg:DataGridTextColumn.EditingElementStyle>
                                  <Style TargetType="TextBox">
                                      <Setter Property="TextWrapping" Value="Wrap" />
                                      <Setter Property="AcceptsReturn" Value="true" />
                                  </Style>
                              </dg:DataGridTextColumn.EditingElementStyle>
                              <dg:DataGridColumn.HeaderStyle>
                                  <Style TargetType="{x:Type dg:DataGridColumnHeader}">
                                      <Setter Property="Background" >
                                          <Setter.Value>
                                              <LinearGradientBrush EndPoint="1,1" StartPoint="0.5,0" SpreadMethod="Pad">
                                                  <GradientStop Color="Brown" Offset="0" />
                                                  <GradientStop Color="White" Offset="1" />
                                              </LinearGradientBrush>
                                          </Setter.Value>
                                      </Setter>
                                      <Setter Property="Foreground" Value="Black" />
                                      <Setter Property="FontSize" Value="20" />
                                      <Setter Property="HorizontalContentAlignment" Value="Center" />
                                      <Setter Property="Width" Value="Auto" />
                                      <Setter Property="BorderBrush" Value="Yellow"/>
                                      <Setter Property="BorderThickness" Value="2,2,2,2"/>
                                  </Style>
                              </dg:DataGridColumn.HeaderStyle>
                          </dg:DataGridTextColumn>
                          <dg:DataGridTemplateColumn Header="DOB" MinWidth="100" CanUserSort="False">
                              <dg:DataGridTemplateColumn.HeaderStyle>
                                  <Style TargetType="{x:Type dg:DataGridColumnHeader}">
                                      <Setter Property="Background" >
                                          <Setter.Value>
                                              <LinearGradientBrush EndPoint="1,.1" StartPoint="0.5,1" SpreadMethod="Pad">
                                                  <GradientStop Color="Orange" Offset="1" />
                                                  <GradientStop Color="Thistle" Offset="0" />
                                              </LinearGradientBrush>
                                          </Setter.Value>
                                      </Setter>
                                      <Setter Property="Foreground" Value="Black" />
                                      <Setter Property="FontSize" Value="20" />
                                      <Setter Property="HorizontalContentAlignment" Value="Center" />
                                      <Setter Property="Width" Value="Auto" />
                                      <Setter Property="BorderBrush" Value="yellow"/>
                                      <Setter Property="BorderThickness" Value="2,2,2,2"/>
                                  </Style>
                              </dg:DataGridTemplateColumn.HeaderStyle>
                              <dg:DataGridTemplateColumn.CellEditingTemplate>
                                  <DataTemplate>
                                      <dg:DatePicker SelectedDate="{Binding DOB}" SelectedDateFormat="Short" CalendarStyle="DynamicResource CalenderControlTemplate" removed="Yellow" />
                                  </DataTemplate>
                              </dg:DataGridTemplateColumn.CellEditingTemplate>
                              <dg:DataGridTemplateColumn.CellTemplate>
                                  <DataTemplate>
                                      <TextBlock Text="{Binding DOB, StringFormat=d}" Foreground="DarkTurquoise" HorizontalAlignment="Center" />
                                  </DataTemplate>
                              </dg:DataGridTemplateColumn.CellTemplate>
                          </dg:DataGridTemplateColumn>
                          <dg:DataGridCheckBoxColumn Header="Pass/Fail" Binding="{Binding Pass}">
                              <dg:DataGridColumn.HeaderStyle>
                                  <Style TargetType="{x:Type dg:DataGridColumnHeader}">
                                      <Setter Property="Background" >
                                          <Setter.Value>
                                              <LinearGradientBrush EndPoint="1,1" StartPoint="0.5,0" SpreadMethod="Pad">
                                                  <GradientStop Color="#FFC2D6F6" Offset="0" />
                                                  <GradientStop Color="White" Offset="1" />
                                              </LinearGradientBrush>
                                          </Setter.Value>
                                      </Setter>
                                      <Setter Property="Foreground" Value="Black" />
                                      <Setter Property="FontSize" Value="20" />
                                      <Setter Property="HorizontalContentAlignment" Value="Center" />
                                      <Setter Property="Width" Value="Auto" />
                                      <Setter Property="BorderBrush" Value="Yellow"/>
                                      <Setter Property="BorderThickness" Value="2,2,2,2"/>
                                  </Style>
                              </dg:DataGridColumn.HeaderStyle>
                          </dg:DataGridCheckBoxColumn>
                          <dg:DataGridTextColumn Header="Nationality" FontWeight="Bold" Foreground="SandyBrown"
                                     FontSize="16" FontStyle="Italic" CanUserSort="False"
                                     Binding="{Binding Path= Nationality}" Width="Auto">
                              <dg:DataGridTextColumn.ElementStyle>
                                  <Style TargetType="TextBlock">
                                      <Setter Property="TextAlignment" Value="Center" />
                                  </Style>
                              </dg:DataGridTextColumn.ElementStyle>
                              <dg:DataGridTextColumn.EditingElementStyle>
                                  <Style TargetType="TextBox">
                                      <Setter Property="TextWrapping" Value="Wrap" />
                                      <Setter Property="AcceptsReturn" Value="true" />
                                  </Style>
                              </dg:DataGridTextColumn.EditingElementStyle>
                              <dg:DataGridColumn.HeaderStyle>
                                  <Style TargetType="{x:Type dg:DataGridColumnHeader}">
                                      <Setter Property="Background" >
                                          <Setter.Value>
                                              <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0" SpreadMethod="Pad">
                                                  <GradientStop Color="Blue" Offset="0" />
                                                  <GradientStop Color="White" Offset="1" />
                                              </LinearGradientBrush>
                                          </Setter.Value>
                                      </Setter>
                                      <Setter Property="Foreground" Value="Black" />
                                      <Setter Property="FontSize" Value="20" />
                                      <Setter Property="HorizontalContentAlignment" Value="Center" />
                                      <Setter Property="Width" Value="Auto" />
                                      <Setter Property="BorderBrush" Value="Yellow"/>
                                      <Setter Property="BorderThickness" Value="2,2,2,2"/>
                                  </Style>
                              </dg:DataGridColumn.HeaderStyle>
                          </dg:DataGridTextColumn>
                      </dg:DataGrid.Columns>

regards iqbal

Posted 26-Jan-12 10:49am

MohammadIqbal

Updated 27-Jan-12 2:51am

v2

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Dean Oliver · Answer 1 · 2012-01-26T19:29:00

Solution 1

Hi when I run your code it works perfectly. Is it not because you may be setting the style for the DatagridColumnHeader in XAML as well? And when are you initialising this code? Can you maybe attach your xaml for your datagrid control please.

Posted 26-Jan-12 19:29pm

Dean Oliver

Comments

[no name] 27-Jan-12 8:41am

Yes I was setting the style in XAML.but I want to change the style during run time, to different various style(in fact a user shall be able to change looks of the DataGrid )

Dean Oliver · Answer 2 · 2012-01-30T18:16:00

Remove your namespace reference of dg: and add this xaml

C#

<datagrid autogeneratecolumns="False" height="200" horizontalalignment="Left" margin="153,84,0,0" name="dataGrid1" verticalalignment="Top" width="200">
          <datagrid.columns>

              <datagridtextcolumn header="AuthorID" fontweight="Black" foreground="Red">
                                     FontSize="16" FontStyle="Italic"
                                     CanUserReorder="True"
                                     CanUserSort="True" SortDirection="Ascending" Binding="{Binding Path=AuthorID}">
                  <datagridtextcolumn.elementstyle>
                      <style targettype="TextBlock">
                          <setter property="TextAlignment" value="Center" />
                      </style>
                  </datagridtextcolumn.elementstyle>
                  <datagridtextcolumn.editingelementstyle>
                      <style targettype="TextBox">
                          <setter property="TextWrapping" value="Wrap" />
                          <setter property="AcceptsReturn" value="true" />
                      </style>
                  </datagridtextcolumn.editingelementstyle>
                  <datagridcolumn.headerstyle>

                      <style targettype="{x:Type DataGridColumnHeader}">
                          <setter property="Background">
                              <setter.value>
                                  <lineargradientbrush endpoint="1,1" startpoint="0.5,0" spreadmethod="Pad">
                                      <gradientstop color="Bisque" offset="0" />
                                      <gradientstop color="Cyan" offset="1" />
                                  </lineargradientbrush>
                              </setter.value>
                          </setter>
                          <setter property="Foreground" value="Black" />
                          <setter property="FontSize" value="20" />
                          <setter property="HorizontalContentAlignment" value="Center" />
                          <setter property="BorderBrush" value="yellow" />
                          <setter property="BorderThickness" value="2,2,2,2" />

                      </style>
                  </datagridcolumn.headerstyle>
              </datagridtextcolumn>
              <datagridtextcolumn header="FirstName" fontweight="Bold" foreground="DarkGreen" fontsize="16" fontstyle="Italic">
                                     CanUserSort="False" Binding="{Binding Path=FirstName}">
                  <datagridtextcolumn.elementstyle>
                      <style targettype="TextBlock">
                          <setter property="TextAlignment" value="Center" />
                      </style>
                  </datagridtextcolumn.elementstyle>
                  <datagridtextcolumn.editingelementstyle>
                      <style targettype="TextBox">
                          <setter property="TextWrapping" value="Wrap" />
                          <setter property="AcceptsReturn" value="true" />
                      </style>
                  </datagridtextcolumn.editingelementstyle>
                  <datagridcolumn.headerstyle>
                      <style targettype="{x:Type DataGridColumnHeader}">

                          <setter property="Background">
                              <setter.value>
                                  <lineargradientbrush endpoint="1,1" startpoint="0.5,0" spreadmethod="Pad">
                                      <gradientstop color="Lavender" offset="0" />
                                      <gradientstop color="BlanchedAlmond" offset="1" />
                                  </lineargradientbrush>
                              </setter.value>
                          </setter>
                          <setter property="Foreground" value="Black" />
                          <setter property="FontSize" value="20" />
                          <setter property="HorizontalContentAlignment" value="Center" />
                          <setter property="Width" value="Auto" />
                          <setter property="BorderBrush" value="Yellow" />
                          <setter property="BorderThickness" value="2,2,2,2" />
                      </style>
                  </datagridcolumn.headerstyle>
              </datagridtextcolumn>
              <datagridtextcolumn header="LastName" fontweight="Bold" foreground="OrangeRed" fontsize="16" fontstyle="Italic">
                                     CanUserSort="False" Binding="{Binding Path=LastName}">
                  <datagridtextcolumn.elementstyle>
                      <style targettype="TextBlock">
                          <setter property="TextAlignment" value="Center" />
                      </style>
                  </datagridtextcolumn.elementstyle>
                  <datagridtextcolumn.editingelementstyle>
                      <style targettype="TextBox">
                          <setter property="TextWrapping" value="Wrap" />
                          <setter property="AcceptsReturn" value="true" />
                      </style>
                  </datagridtextcolumn.editingelementstyle>
                  <datagridcolumn.headerstyle>
                      <style targettype="{x:Type DataGridColumnHeader}">
                          <setter property="Background">
                              <setter.value>
                                  <lineargradientbrush endpoint="1,1" startpoint="0.5,0" spreadmethod="Pad">
                                      <gradientstop color="Brown" offset="0" />
                                      <gradientstop color="White" offset="1" />
                                  </lineargradientbrush>
                              </setter.value>
                          </setter>
                          <setter property="Foreground" value="Black" />
                          <setter property="FontSize" value="20" />
                          <setter property="HorizontalContentAlignment" value="Center" />
                          <setter property="Width" value="Auto" />
                          <setter property="BorderBrush" value="Yellow" />
                          <setter property="BorderThickness" value="2,2,2,2" />
                      </style>
                  </datagridcolumn.headerstyle>
              </datagridtextcolumn>
              <datagridtemplatecolumn header="DOB" minwidth="100" canusersort="False">
                  <datagridtemplatecolumn.headerstyle>
                      <style targettype="{x:Type DataGridColumnHeader}">
                          <setter property="Background">
                              <setter.value>
                                  <lineargradientbrush endpoint="1,.1" startpoint="0.5,1" spreadmethod="Pad">
                                      <gradientstop color="Orange" offset="1" />
                                      <gradientstop color="Thistle" offset="0" />
                                  </lineargradientbrush>
                              </setter.value>
                          </setter>
                          <setter property="Foreground" value="Black" />
                          <setter property="FontSize" value="20" />
                          <setter property="HorizontalContentAlignment" value="Center" />
                          <setter property="Width" value="Auto" />
                          <setter property="BorderBrush" value="yellow" />
                          <setter property="BorderThickness" value="2,2,2,2" />
                      </style>
                  </datagridtemplatecolumn.headerstyle>
                  <datagridtemplatecolumn.celleditingtemplate>
                      <datatemplate>
                          <datepicker selecteddate="{Binding DOB}" selecteddateformat="Short" calendarstyle="DynamicResource CalenderControlTemplate" />
                      </datatemplate>
                  </datagridtemplatecolumn.celleditingtemplate>
                  <datagridtemplatecolumn.celltemplate>
                      <datatemplate>
                          <textblock text="{Binding DOB, StringFormat=d}" foreground="DarkTurquoise" horizontalalignment="Center" />
                      </datatemplate>
                  </datagridtemplatecolumn.celltemplate>
              </datagridtemplatecolumn>
              <datagridcheckboxcolumn header="Pass/Fail" binding="{Binding Pass}">
                  <datagridcolumn.headerstyle>
                      <style targettype="{x:Type DataGridColumnHeader}">
                          <setter property="Background">
                              <setter.value>
                                  <lineargradientbrush endpoint="1,1" startpoint="0.5,0" spreadmethod="Pad">
                                      <gradientstop color="#FFC2D6F6" offset="0" />
                                      <gradientstop color="White" offset="1" />
                                  </lineargradientbrush>
                              </setter.value>
                          </setter>
                          <setter property="Foreground" value="Black" />
                          <setter property="FontSize" value="20" />
                          <setter property="HorizontalContentAlignment" value="Center" />
                          <setter property="Width" value="Auto" />
                          <setter property="BorderBrush" value="Yellow" />
                          <setter property="BorderThickness" value="2,2,2,2" />
                      </style>
                  </datagridcolumn.headerstyle>
              </datagridcheckboxcolumn>
              <datagridtextcolumn header="Nationality" fontweight="Bold" foreground="SandyBrown">
                                     FontSize="16" FontStyle="Italic" CanUserSort="False"
                                     Binding="{Binding Path= Nationality}" Width="Auto">
                  <datagridtextcolumn.elementstyle>
                      <style targettype="TextBlock">
                          <setter property="TextAlignment" value="Center" />
                      </style>
                  </datagridtextcolumn.elementstyle>
                  <datagridtextcolumn.editingelementstyle>
                      <style targettype="TextBox">
                          <setter property="TextWrapping" value="Wrap" />
                          <setter property="AcceptsReturn" value="true" />
                      </style>
                  </datagridtextcolumn.editingelementstyle>
                  <datagridcolumn.headerstyle>
                      <style targettype="{x:Type DataGridColumnHeader}">
                          <setter property="Background">
                              <setter.value>
                                  <lineargradientbrush endpoint="0.5,1" startpoint="0.5,0" spreadmethod="Pad">
                                      <gradientstop color="Blue" offset="0" />
                                      <gradientstop color="White" offset="1" />
                                  </lineargradientbrush>
                              </setter.value>
                          </setter>
                          <setter property="Foreground" value="Black" />
                          <setter property="FontSize" value="20" />
                          <setter property="HorizontalContentAlignment" value="Center" />
                          <setter property="Width" value="Auto" />
                          <setter property="BorderBrush" value="Yellow" />
                          <setter property="BorderThickness" value="2,2,2,2" />
                      </style>
                  </datagridcolumn.headerstyle>
              </datagridtextcolumn>
          </datagrid.columns>
      </datagrid>

I think the problem lies in your xaml with the namespace declaration of:

C#

dg:DataGridTextColumn

what is

C#

dg:

defined as in you xaml.

Try excluding it and see now if you don't get the problem. because it seems to work fine for me.

Regards