A BUG for DataGridCheckBoxColumn of Avalonia.Controls.DataGrid

[jioyou]

Expected behavior

I'm running into a small bug when using Avalonia.Controls.DataGrid's DataGridCheckBoxColumn.
After clicking the checkbox of the DataGridCheckBoxColumn column,
click again to unselect it,
but there is no response.
You need to click on another cell and then click checkbox to unselect it.

Screenshots

Environment

• OS: Windows
• Avalonia-Version: [e.g. 11.0.7 and 11.0.9]

Additional context

11.0.5 and earlier versions is fine, 11.0.7 and later versions have this issue

[timunie]

Could you check nightly builds please?

[timunie]

I cannot reproduce it using 11.0.9. Please file a minimal repro. Thx.

[timunie]

ExtraPoint needs to raise PropertyChanged

[khanhstitsel]

I implemented your suggestions just in case, but even before that, it is not really a matter of binding that I am encountering. Checkboxes that are inside of data grid columns behaves totally different from the checkboxes that are outside.

After the changes were made, the UI behaviors are still the same. Once checked or unchecked, even if I double click the same data grid column checkbox again multiple time, it will not go to the opposite state; I need to click on another window, or click on some other element within the same form - clicking on white space within the same form does not resolve the inability of checkbox to switch state. Normal checkbox component works fine as expected, I can keep clicking on the same checkbox to repeatedly switch state.

The code after your suggestion is here just in case, there is no functions that changes the states of Included in the code behind:

public class ExtraPoint : INotifyPropertyChanged{
public ExtraPoint(Boolean included, Int32 testPointNumber) {
	Included = included;
	TestPointNumber = testPointNumber;
}

public event PropertyChangedEventHandler PropertyChanged;

protected virtual void OnPropertyChanged(string propertyName) {
	PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}

public ExtraPoint() { }

Boolean _included = false;
public Boolean Included {
	get => _included;
	set {
		_included = value;
		OnPropertyChanged(nameof(Included));
	} 
}

Int32 _testPointNumber = 0;
/// <summary>Gets or sets the test point number.</summary>
public Int32 TestPointNumber {
	get => _testPointNumber;
	set {
		_testPointNumber = value;
		OnPropertyChanged(nameof(TestPointNumber));
	}
}

}

[timunie]

ah okay that's the confusion. So the DataGrid is specail here as it needs a double-click to make the cell entering edit mode and a lost focus to exit edit mode. Then the binding gets updated. If you dislike that, I suggest to use a DataGridTemplateColumn where you can add an editable CheckBox directly.

[khanhstitsel]

I see, so that is intended behavior? Not sure if I ever use any GUI that have such a strange checkbox behavior. Anyhow, thank you very much for your time.

[timunie]

DataGrid was isnpired by WPF and Silverlight afaik.

• https://stackoverflow.com/questions/10651206/datagridcheckboxcolumn-two-way-binding

in 11.1 we will also have UpdateSourceTrigger like WPF has but we haven't it released yet.