Application crash when using the x:Bind in ComboBox

[sudharsan-narayanan]

Describe the bug

In ComboBox, SelectedItem property is binded with x:bind and the combo box is editable. Now, user tried to enter value manually and press enter. Application gets crashed.

Note: If we use Binding the control works fine.

MSControlTest.zip

Steps to reproduce the bug

1. Run the sample.
2. Edit the combo box and enter the non-listed item.
3. Now, press enter key.

Application crashed with Unhandled exception.

Expected behavior

It should work fine with all type of binding.

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.7.1: 1.7.250401001

Windows version

Windows 11 (23H2): Build 22631

Additional context

No response

[Skittles2519]

I deployed your solution and experienced the crash you mention on a custom submission. However, this is not due to a bug with binding via x:bind to the combo box. The error received is - Unable to cast object of type 'System.String' to type 'MSControlTest.WetterTypDto'.

You are submitting a string and it's expecting your custom WetterTypDto. With two-way binding it bombs because it is looking to update your viewmodel colors list, and it can't with just the string. You will need to add a converter in your two way binding to convert the string to a WetterTypeDto, or add a new WetterTypeDto manually on the submission event to update your view model with a custom submission