回答編集履歴

  はっきり言って面倒くさいのですが、このように`ElementStyle`・`EditingElementStyle`を設定します。

 

  <Window

  x:Class="Questions314501.MainWindow"

  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

  Width="800"

  Height="450">

  <Grid>

  <DataGrid AutoGenerateColumns="False" ItemsSource="{Binding}">

  <DataGrid.Resources>

  <Style

  x:Key="RightElementStyle"

  BasedOn="{x:Static DataGridTextColumn.DefaultElementStyle}"

  TargetType="TextBlock">

  <Setter Property="HorizontalAlignment" Value="Right" />

  </Style>

  <Style

  x:Key="RightEditingElementStyle"

  BasedOn="{x:Static DataGridTextColumn.DefaultEditingElementStyle}"

  TargetType="TextBox">

  <Setter Property="HorizontalContentAlignment" Value="Right" />

  </Style>

  </DataGrid.Resources>

  <DataGrid.Columns>

  <DataGridTextColumn Binding="{Binding Item1}" Header="Normal" />

 

  <DataGridTextColumn

  Binding="{Binding Item2}"

  ElementStyle="{StaticResource RightElementStyle}"

  Header="View Right" />

 

  <DataGridTextColumn

  Binding="{Binding Item3}"

  EditingElementStyle="{StaticResource RightEditingElementStyle}"

  ElementStyle="{StaticResource RightElementStyle}"

  Header="View&amp;Edit Right" />

  </DataGrid.Columns>

  </DataGrid>

  </Grid>

  </Window>

  ```