Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.
And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.
[Bug] Unable to make use of BindCommand method on MenuFlyoutItem object (Desktop menu)
See original GitHub issueDescription
Getting this exception message when the application is launched with the BindCommand method that is added to the MenuFlyoutItem object
No command + command parameter properties are registered for BindableObject type Microsoft.Maui.Controls.MenuFlyoutItem Register command + command parameter properties for this BindableObject type
After this exception, have tried to register the command using the DefaultBindableProperties.RegisterForCommand method.
But it resulted in a different exception with the below message (as MenuFlyoutItem inherits from MenuItem):
An item with the same key has already been added. Key: Microsoft.Maui.Controls.MenuItem
Stack Trace
Link to Reproduction Sample
https://github.com/egvijayanand/dotnet-maui-samples
Solution name: MenuApp (Made available under the src folder)
The page that is causing this exception is available in the MenuPageCS.cs
Steps to Reproduce
- Clone the repository
- Navigate to the src folder
- Open the MenuApp solution
- Set the instance of
MenuPageCSas the Startup page in App.xaml.cs
Expected Behavior
The command is expected to bound to the MenuFlyoutItem object and invoke the associated action.
Actual Behavior
Ends in an exception.
Basic Information
- Version with issue: 1.0.0
- Last known good version: NA
- IDE: VS2022 17.3.0 Preview 3.0
- Platform Target Frameworks:
- iOS: NA
- Android: NA
- UWP: net6.0-windows10.0.19041.0 - running on Windows 11
- MacCatalyst - Haven’t tried on it due to infra constraint.
- Android Support Library Version:
- NuGet Packages:
- Affected Devices:
Workaround
The event handler with the Invoke API works for now. Only Command is having the issue.
Reproduction imagery
Issue Analytics
- State:
- Created a year ago
- Comments:12
Top Results From Across the Web
Top Related Medium Post
Top Related StackOverflow Question
Troubleshoot Live Code
Top Related Reddit Thread
Top Related Hackernoon Post
Top Related Tweet
Top Related Dev.to Post
Top Related Hashnode Post
Seems like the behavior is not consistent in XAML too, reference binding works but relative source binding fails.
Moreover, there is already an open issue (#5382) in the MAUI repo itself for Menu Commanding.
I think that is what influences here as well, let’s wait for it to get addressed and revisit this, if necessary.
Ah - apologies! I see now that we’re testing
MenuFlyoutItem. I’m able to reproduce + confirm the bug.