WPF DataGrid validation error and editing

Question

WPF DataGrid validation error and editing

Neo 421

I see that if there is validation error, DataGrid enters a special state - it won't allow any other editing until the error is corrected.
Now I have a problem. How can I tell if the DataGrid is in error state in code? In RowEndEditing event, I cannot tell if the edit commit is valid or not.

Hui Liu-MSFT 48,676 Reputation points Microsoft External Staff

2022-12-23T07:40:59.333+00:00

Hi,@Neo . Could you show the minimal code that can reproduce your problem? What are the expected and actual performance of what you want to achieve?
Neo 421 Reputation points

2022-12-23T09:03:09.153+00:00

That's not what I meant. The 'problem' is not a problem. The 'error' state is quite expected because that's how DataGrid handles validation errors.

What I want is a way to tell if DataGrid is this error state so that I can disable some context operations such as disabling some context menu items.

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Hui Liu-MSFT 48,676 Reputation points Microsoft External Staff

2022-12-23T07:40:59.333+00:00

Hi,@Neo . Could you show the minimal code that can reproduce your problem? What are the expected and actual performance of what you want to achieve?
Neo 421 Reputation points

2022-12-23T09:03:09.153+00:00

That's not what I meant. The 'problem' is not a problem. The 'error' state is quite expected because that's how DataGrid handles validation errors.

What I want is a way to tell if DataGrid is this error state so that I can disable some context operations such as disabling some context menu items.

Answer 1

Hui Liu-MSFT 48,676 Microsoft External Staff

Hi,@Neo . For detecting Validation Errors, you could try to refer to the following code. You can also refer here for more solutions.
274023-validation-state.txt

The reuslt:

Hope my solution could help you.
Best Regards,
Hui

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Hui Liu-MSFT 48,676 Reputation points Microsoft External Staff

2022-12-28T09:27:54.4+00:00

Hi,@Neo . Is there any update to the question? Did my answer solve your problem? If so, you could accept it as the answer. It's helpful for community members with related questions.

Neo 421

Though your answer works as expected, but it took too much code. All I expected is a property or something to check. But, maybe that's the nature of WPF design.

What I ended up with is much more direct and simple solution. I store the data item (DataRowView) in DataGrid_BeginningEdit and checks its IsEdit property.

/*  
 * This field holds last edited data row. The reason is that if last edit  
 * results in an error state (due to validation), DataGrid will enter into  
 * a special state not allowing any other operations (e.g., disabling it  
 * will throw an exception); and the data row will still be in edit mode.  
 * That is DataRowView.IsEdit still holds true.  
 *   
 * Many operations will check if the last edited data row is still in editing  
 * state and will do nothing if it is true.  
 */  
private DataRowView _editingDataRowView;

Of course this only applies to DataTable as datasource.

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WPF DataGrid validation error and editing

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