WPF Datagrid control the gap between the first row and first column

Original: the WPF the Datagrid control the gap between the first row and first column

This location is here

We change the template DataGridControltemplate

Look inside the tree structure is a BUtton

Select function is able to find it can directly get rid of

 

  
  
<ControlTemplate x:Key= "DataGridControlTemplate1" TargetType= "{x:Type DataGrid}">
<Border BorderBrush= "{TemplateBinding BorderBrush}" BorderThickness= "{TemplateBinding BorderThickness}" Background= "{TemplateBinding Background}" Padding= "{TemplateBinding Padding}" SnapsToDevicePixels= "True">
<ScrollViewer x:Name= "DG_ScrollViewer" Focusable= "False">
<ScrollViewer.Template>
<ControlTemplate TargetType= "{x:Type ScrollViewer}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width= "Auto"/>
<ColumnDefinition Width= "*"/>
<ColumnDefinition Width= "Auto"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height= "Auto"/>
<RowDefinition Height= "*"/>
<RowDefinition Height= "Auto"/>
</Grid.RowDefinitions>
<Button Width= "208" Height= "125.917" Command= "ApplicationCommands.SelectAll" Focusable= "False" Style= "{DynamicResource {ComponentResourceKey ResourceId=DataGridSelectAllButtonStyle, TypeInTargetAssembly={x:Type DataGrid}}}">
<Button.Visibility>
<Binding Path= "HeadersVisibility" RelativeSource= "{RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type DataGrid}}">
<Binding.ConverterParameter>
<DataGridHeadersVisibility>All</DataGridHeadersVisibility>
</Binding.ConverterParameter>
</Binding>
</Button.Visibility>
</Button>
<DataGridColumnHeadersPresenter x:Name= "PART_ColumnHeadersPresenter" Grid.Column= "1">
<DataGridColumnHeadersPresenter.Visibility>
<Binding Path= "HeadersVisibility" RelativeSource= "{RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type DataGrid}}">
<Binding.ConverterParameter>
<DataGridHeadersVisibility>Column</DataGridHeadersVisibility>
</Binding.ConverterParameter>
</Binding>
</DataGridColumnHeadersPresenter.Visibility>
</DataGridColumnHeadersPresenter>
<ScrollContentPresenter x:Name= "PART_ScrollContentPresenter" CanContentScroll= "{TemplateBinding CanContentScroll}" CanHorizontallyScroll= "False" Grid.ColumnSpan= "2" CanVerticallyScroll= "False" ContentTemplate= "{TemplateBinding ContentTemplate}" Content= "{TemplateBinding Content}" ContentStringFormat= "{TemplateBinding ContentStringFormat}" Grid.Row= "1"/>
<ScrollBar x:Name= "PART_VerticalScrollBar" Grid.Column= "2" Maximum= "{TemplateBinding ScrollableHeight}" Orientation= "Vertical" Grid.Row= "1" Visibility= "{TemplateBinding ComputedVerticalScrollBarVisibility}" Value= "{Binding VerticalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" ViewportSize= "{TemplateBinding ViewportHeight}"/>
<Grid Grid.Column= "1" Grid.Row= "2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width= "{Binding NonFrozenColumnsViewportHorizontalOffset, RelativeSource={RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type DataGrid}}}"/>
<ColumnDefinition Width= "*"/>
</Grid.ColumnDefinitions>
<ScrollBar x:Name= "PART_HorizontalScrollBar" Grid.Column= "1" Maximum= "{TemplateBinding ScrollableWidth}" Orientation= "Horizontal" Visibility= "{TemplateBinding ComputedHorizontalScrollBarVisibility}" Value= "{Binding HorizontalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" ViewportSize= "{TemplateBinding ViewportWidth}"/>
</Grid>
</Grid>
</ControlTemplate>
</ScrollViewer.Template>
<ItemsPresenter SnapsToDevicePixels= "{TemplateBinding SnapsToDevicePixels}"/>
</ScrollViewer>
</Border>
</ControlTemplate>
 
 

 

This can be changed

  
  
<Button Width= "208" Height= "125.917" Command= "ApplicationCommands.SelectAll" Focusable= "False" Style= "{DynamicResource {ComponentResourceKey ResourceId=DataGridSelectAllButtonStyle, TypeInTargetAssembly={x:Type DataGrid}}}">
<Button.Visibility>
<Binding Path= "HeadersVisibility" RelativeSource= "{RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type DataGrid}}">
<Binding.ConverterParameter>
<DataGridHeadersVisibility>All</DataGridHeadersVisibility>
</Binding.ConverterParameter>
</Binding>
</Button.Visibility>
</Button>