Set a padding on dataGridCells in WPF

The problem is that the Padding isn't transfered to the Border that's in the Template for DataGridCell. You can edit the Template and add the TemplateBinding for Padding

<DataGrid ...>    <DataGrid.CellStyle>        <Style TargetType="DataGridCell">            <Setter Property="Padding" Value="20"/>            <Setter Property="Template">                <Setter.Value>                    <ControlTemplate TargetType="{x:Type DataGridCell}">                        <Border Padding="{TemplateBinding Padding}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True">                            <ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>                        </Border>                    </ControlTemplate>                </Setter.Value>            </Setter>        </Style>    </DataGrid.CellStyle>    <!--...--></DataGrid>

Here's a cleaner method (my opinion) that combines the approach from David

<Resources>    <Style x:Key="ColumnElementStyle" TargetType="TextBlock">        <Setter Property="Margin" Value="5,0,10,0" />    </Style></Resources>

then...

<DataGridTextColumn ElementStyle="{StaticResource ColumnElementStyle}" /><DataGridTextColumn ElementStyle="{StaticResource ColumnElementStyle}" />

(in my case, my rows are readonly, so no EditingStyle)

Almost 5 years later, since this question seems to still be of use (it is still getting upvotes) and since it has been requested, here is the solution I used (with the ElementStyle) on a TextColumn (but you can do the same for any type of DataGridColumn):

I did it all in code behind:

class MyTextColumn : DataGridTextColumn{    public MyTextColumn()    {        ElementStyle = new Style(typeof(TextBlock));        EditingElementStyle = new Style(typeof(TextBox));        ElementStyle.Setters.Add(new Setter(FrameworkElement.MarginProperty, new Thickness(3)));        EditingElementStyle.Setters.Add(new Setter(Control.PaddingProperty, new Thickness(0, 1, 0, 1)));    }}

But if you want to do it directly in xaml:

<DataGrid.Columns>    <DataGridTextColumn>        <DataGridTextColumn.ElementStyle>            <Style TargetType="TextBlock">                <Setter Property="Margin" Value="3"/>            </Style>        </DataGridTextColumn.ElementStyle>        <DataGridTextColumn.EditingElementStyle>            <Style TargetType="TextBox">                <Setter Property="Padding" Value="0 1 0 1"/>            </Style>        </DataGridTextColumn.EditingElementStyle>    </DataGridTextColumn></DataGrid.Columns>