如何使 WPF DataGridCell 只读? [英] How to make WPF DataGridCell ReadOnly?

问题描述

我知道您可以使整个 DataGrid 或一整列就绪 (IsReadOnly = true).但是，在单元级别，此属性仅准备就绪.但我确实需要这种级别的粒度.在过去，DataGrid 是公共领域时，有一篇关于通过更改源代码将 IsReadOnly 添加到一行的博客，但现在我没有 DataGrid 的源代码.有什么解决方法?

I understand you can make the whole DataGrid or a whole column readyonly (IsReadOnly = true). However, at cell level this property is ready only. But I do need this level of granularity. There is blog about adding IsReadOnly to a row by changing the source code in old days when DataGrid was public domain, but now I don't have source code for DataGrid. What's workaround?

禁用单元格 (IsEnabled=false) 几乎可以满足我的需要.但问题是你甚至不能点击禁用的单元格来选择行(我有全行选择模式).

Making cell disabled (IsEnabled=false) almost meets my need. But the problem is that you can't even click the disabled cell to select the row (I have full row selection mode).

由于没有人回答过这个问题，所以我想这不是一个容易解决的问题.这是一个可能的解决方法:使单元格不可编辑.唯一的问题是单击单元格不会选择该行.我刚刚注意到，当单击禁用的单元格时，仍会触发 DataGrid 的 MouseDown 或 MouseUp 事件.在这个事件处理程序中，如果我能找出它点击的行，我可以以编程方式选择该行.但是，我无法弄清楚如何从 DataGrid.InputHitTest 中找到基础行.有人可以给我一些提示吗?

Since nobody has responded to this question, so I guess it's not an easy fix. Here is a possible workaround: Make the cell uneditable. The only problem is that clicking the cell doesn't select the row. I just noticed that MouseDown or MouseUp event of the DataGrid is still fired when the disabled cell is clicked. In this event handler, if I could figure out the row it clicked, I could select the row programmatically. However, I couldn't figure out how to find the underlying row from DataGrid.InputHitTest. Can somebody please give me some tip?

推荐答案

我遇到了同样的问题，单元格在某些行中应该是只读的，而在其他行中则不是.这是一个变通的解决方案:

I've encountered the same problem, the cell should be read-only in some rows but not in the others. Here is a workaround solution:

想法是在两个模板之间动态切换CellEditingTemplate，一个和CellTemplate中的一样，另一个是为了编辑.这使得编辑模式的行为与非编辑单元格完全相同，尽管它处于编辑模式.

The idea is to dynamically switch the CellEditingTemplate between two templates, one is the same as the one in the CellTemplate, the other is for editing. This makes the edit mode acts exactly the same as the non-editing cell although it is in edit mode.

以下是执行此操作的一些示例代码，请注意此方法需要 DataGridTemplateColumn:

The following is some sample code for doing this, notice that this approach requires DataGridTemplateColumn:

首先，为只读和编辑单元定义两个模板:

First, define two templates for read-only and editing cells:

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

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

然后定义一个带有附加ContentPresenter层的数据模板，并使用Trigger切换ContentPresenter的ContentTemplate，所以上面两个模板可以通过IsEditable绑定动态切换:

Then define a data template with additional ContentPresenter layer and use Trigger to switch the ContentTemplate of the ContentPresenter, so the above two templates can be switched dynamically by the IsEditable binding:

<DataGridTemplateColumn CellTemplate="{StaticResource ReadonlyCellTemplate}">
  <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 IsEditable}" Value="True">
          <Setter TargetName="Presenter" Property="ContentTemplate" Value="{StaticResource EditableCellTemplate}" />
        </DataTrigger>
      </DataTemplate.Triggers>
    </DataTemplate>
  </DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>

HTH

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