验证失败时出现DataGrid异常(不允许使用DeferRefresh ...)

问题描述

与DataGrid验证方案问题，

In the same series as the DataGrid validation scheme issues , I get an exception when

• 单元格无效
• DataContext更改

这发生在绑定到CollectionViewSource的DataGrid中.此CVS本身具有绑定到ListBox当前选定产品的DataContext.因此，我们正在编辑产品的详细信息，这些详细信息包括DataGrid(DataGridTextColumn)中的数据列表. 在这种情况下).

This happens in a DataGrid, which is bound to a CollectionViewSource. This CVS itself has a DataContext bound to the currently selected product of a ListBox. So we are editing the details of product, those details include a data list in a DataGrid (DataGridTextColumn in this case).

通过使用实现IDataErrorInfo的数据类型或通过ValidationRule，如果验证失败，则DataGrid会通过保留TextBox并在其周围显示一个红色框来做出反应(当验证正常时，单元格将转换回一个 TextBlock).

Either by using a data type that implements IDataErrorInfo or by using a ValidationRule, if the validation fails the DataGrid reacts by keeping the TextBox and showing a red box around it (when the validation is OK, the cell is tranformed back to a TextBlock).

没有什么可以阻止我选择其他产品.然后，DataGrid显示新数据，一切正常.但是，如果我返回验证失败的产品，则会收到此异常:

Nothing prevents me from selecting another product. The DataGrid then shows the new data and everything is fine. But if I come back to the product which failed validation, I get this exception:

InvalidOperationException，在AddNew或EditItem事务期间不允许使用'DeferRefresh'.

如何防止这种情况?选择其他产品或DataContext更改后，取消对该故障单元格上的编辑的正确方法是什么?

How can I prevent that? What is the correct way of cancelling the edit on that faulty cell when another product is selected, or when the DataContext changes?

我可以检测到那些事件，但是CancelEdit()在DataGrid上不起作用(无结果).

I can detect those events, but CancelEdit() doesn't work on the DataGrid (no result).

我正在使用.NET 4.

I'm using .NET 4.

 

可以在此处查看代码: C#部分， XAML部分.可以下载代码从此处.

The code can be viewed here: C# part ,XAML part . The code can be downloadedfrom here .

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