Command is missing on Checkbox control

[sam-wheat]

Description

Why does Button have an ICommand to handle the click event but Checkbox has no such convenience?

Steps to Reproduce

Add Checkbox to view/control.

Version with bug

Release Candidate 3 (current)

Last version that worked well

Unknown/Other

Affected platforms

I was not able test on other platforms

Affected platform versions

windows 10.0.19041.0

Did you find any workaround?

Community toolkit EventToCommand.

Writing code in the setter of a property bound to IsChecked. The horror.

Relevant log output

No response

[jfversluis]

It probably was simply never implemented, so this would be an enhancement. There are multiple ways to go about this depending on your needs, but I can see this might be handy to have.

[sam-wheat]

The MVVM pattern is a natural choice for .NET MAUI apps

Yes, it is. Please use this ticket or raise others to implement commanding robustly not just for Checkbox but for all controls (ListView.SelectionChanged).

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.

[WimpleDimple]

I've spent two days trying to figure out why the EventToCommandBehavior wouldn't trigger for event "CheckedChanged" to fire a command. This was helpful. I'm just not sure quite what to do at this point.

[sam-wheat]

I suggest you try Uno.

[DeerSteak]

I know it's a terrible workaround, but for now I've created the Command in the ViewModel and then in the constructor tie the CheckedChanged event handler to the Command's Execute method:

MyCheckbox.CheckedChanged += (s, e) => viewModel.MyCheckboxChangedCommand.Execute(null);

Takes a little bit more to do the CanExecute logic, but not much. It's as close as we're going to get until we get the Command property on Checkboxes. It seems to work; binding the IsChecked property to a bool in the ViewModel still changes the value, but now I can do other logic, too.

[DeerSteak]

I just discovered that CommunityToolkit.Mvvm adds auto-generated methods for each of the properties Changed and Changing for any ObservableProperty you create. So if your property is called IsSelected, you can do this:

[ObservableProperty]
private bool _isSelected;

partial void OnIsSelectedChanged(bool value)
{
    //do what you would otherwise do in a Command here
}

Found this info here. This is probably a cleaner-ish workaround? https://learn.microsoft.com/en-us/dotnet/communitytoolkit/mvvm/generators/observableproperty