Xamly 将键盘焦点设置为 DataGridTemplateColumn 单元格中的元素？

Question

我已经在 DataGridTemplateColumn.CellEditing DataTemplate 中设置了一些内容。 我希望当单元格编辑加载并显示模板时，键盘焦点应该给予模板中的某个控件。

考虑这个例子，当您进入编辑模式时，文本框不是以键盘为中心的：

<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
    <Grid>
    <DataGrid Name="dg" AutoGenerateColumns="False">
      <DataGrid.Columns>
        <DataGridTemplateColumn Header="Title">
          <DataGridTemplateColumn.CellTemplate>
            <DataTemplate>
              <TextBlock Text="{Binding Title}"/>
            </DataTemplate>
          </DataGridTemplateColumn.CellTemplate>
          <DataGridTemplateColumn.CellEditingTemplate>
            <DataTemplate>
              <TextBox Text="{Binding Title}"/>
            </DataTemplate>
          </DataGridTemplateColumn.CellEditingTemplate>
        </DataGridTemplateColumn>
        <DataGridTemplateColumn Header="Value">
          <DataGridTemplateColumn.CellTemplate>
            <DataTemplate>
              <TextBlock Text="{Binding Note}"/>
            </DataTemplate>
          </DataGridTemplateColumn.CellTemplate>
          <DataGridTemplateColumn.CellEditingTemplate>
            <DataTemplate>
              <TextBox Text="{Binding Note}"/>
            </DataTemplate>
          </DataGridTemplateColumn.CellEditingTemplate>
        </DataGridTemplateColumn>
      </DataGrid.Columns>      
    </DataGrid>
  </Grid>
</Window>

---

Class MainWindow 

  Private Sub Window_Loaded(ByVal sender As Object,
                            ByVal e As RoutedEventArgs) Handles MyBase.Loaded

    Dim data As New List(Of Item) From
      {New Item,
       New Item,
       New Item}
    dg.ItemsSource = data
  End Sub

End Class

Public Class Item
  Private Shared Number As Integer = 0
  Sub New()
    Number += 1
  End Sub
  Public Property Title = "Title " & Number.ToString
  Public Property Note = "Note " & Number.ToString
End Class

Answer 1

答案其实很简单，上面的文本框应该更改如下：

<TextBox Text="{Binding Title}"
  FocusManager.FocusedElement="{Binding RelativeSource={RelativeSource Self}}"/>
<TextBox Text="{Binding Note}"
  FocusManager.FocusedElement="{Binding RelativeSource={RelativeSource Self}}"/>