WPF DataGrid - 带有 PropertyChanged 的​​ DataGridTextColumn 十进制/双精度/浮点数输入

Question

I'm having trouble with decimal (double/float) inputs in DataGridTextColumn with UpdateSourceTrigger=PropertyChanged.

(1) I have searched several sites and many suggest to change this to LostFocus. Im not very keen on this implementation cause the behaviour with PropertyChanged is what I require. Unless there is a way to get the same result with LostFocus??

I have read the following articles on stackoverflow - Link 1 , Link 2 , Link 3 , Link 4 , Link 5 & Link 6

(2) Using Binding="{Binding StringFormat=N2}" or its variation has a very annoying behavior as described in the comments in Link 4 .

(3) The other method is to allow string input and parse it as double in the back end. This is fine-ish, and I'm holding onto it as a last resort solution only.

(4) Lastly in the same Link 4 , a solution mentioned by xmedeko - System.Windows.FrameworkCompatibilityPreferences.KeepTextBoxDisplaySynchronizedWithTextProperty = false; for .NET 4.5 or later only.

I do have the newer version but not sure how/where to implement this line of code. Or if there's a way to turn this property false in the XAML itself? Any help is greatly appreciated. Unable to reply as a comment on that link due to my reputation level.

If there is a any other neater way while keeping the behavior similar to PropertyChanged, would be very helpful.

CODE
XAML - <DataGridTextColumn Header="Rate" Binding="{Binding Path=Rate, UpdateSourceTrigger=PropertyChanged}" Width="90"/>

cs -

public void NotifyPropertyChanged(string property)
{
   PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(property));
}

public double Rate
{
   get { return rate; }
   set { rate = value; NotifyPropertyChanged("Rate"); }
}

The code is actually very simple. This is displayed on a datagrid. The DataGridTextColumn does not accept decimal values and this correctly noted by Chevul Ervin in Link 2 -

UpdateSourceTrigger=PropertyChanged reevalutes the text on every keystroke. A number that ends in a decimal point is invalid. Change the UpdateSourceTrigger to LostFocus (same as removing it) or try to type the '.' while you have other digits after it.

Answer 1

一个老问题，但我想分享一个奇怪的解决方案:) 通过“ UpdateSourceTrigger=LostFocus ”更改“ UpdateSourceTrigger=PropertyChanged ”将允许十进制值。

Answer 2

I did quite a bit of research and found no solution. So going with Option 3 - allow string input and handle it in the backend.