更改模板内元素的绑定

Question

I have a DataGrid where different items in the row can be either editable or readonly.

If I had a single cell that needed to be make read only at will, I'd use something like

<DataGrid.Resources>
    <!-- the non-editing cell -->
    <DataTemplate x:Key="ReadonlyCellTemplate">
        <TextBlock Text="{Binding UserName}" />
    </DataTemplate>

    <!-- the editing cell -->
    <DataTemplate x:Key="EditableCellTemplate">
        <TextBox Text="{Binding UserName}" />
    </DataTemplate>
</DataGrid.Resources>

And than I would apply that template to a column of my choice.

<DataGridTemplateColumn CellTemplate="{StaticResource ReadonlyCellTemplate}" Header="User name">
    <DataGridTemplateColumn.CellEditingTemplate>
        <DataTemplate>
            <!-- the additional layer of content presenter -->
            <ContentPresenter x:Name="Presenter" Content="{Binding}" ContentTemplate="{StaticResource ReadonlyCellTemplate}" />
            <DataTemplate.Triggers>
                <!-- dynamically switch the content template by IsEditable binding -->
                <DataTrigger Binding="{Binding CreationFieldsEditable}" Value="True">
                    <Setter TargetName="Presenter" Property="ContentTemplate" Value="{StaticResource EditableCellTemplate}" />
                </DataTrigger>
            </DataTemplate.Triggers>
        </DataTemplate>
    </DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>

I want to be able to change {Binding UserName} inside the template, so I can apply the template to different columns.

How do I do that?

Answer 1

instead of

 <DataTemplate x:Key="EditableCellTemplate">
    <TextBox Text="{Binding UserName}" />
</DataTemplate>

you need to extend the template:

  <DataTemplate x:Key="t1">
        <TextBox Text="{Binding UserName1}" />
    </DataTemplate>
    <DataTemplate x:Key="t2">
        <TextBox Text="{Binding UserName2}" />
    </DataTemplate>
    <DataTemplate x:Key="EditableCellTemplate">
        <ContentPresenter x:Name="ctp" />

        <DataTemplate.Triggers>
            <DataTrigger Binding="{Binding MyProperty}"
                         Value="1">
                <Setter TargetName="ctp"
                        Property="ContentTemplate"
                        Value="{StaticResource t1}" />
            </DataTrigger>
            <DataTrigger Binding="{Binding MyProperty}"
                         Value="2">
                <Setter TargetName="ctp"
                        Property="ContentTemplate"
                        Value="{StaticResource t2}" />
            </DataTrigger>
        </DataTemplate.Triggers>
    </DataTemplate>

This should work if I understand your idea well.