Xamarin Forms按钮单击事件在运行时崩溃

Question

I'm editing an application in Xamarin targeting: Windows, iOS and Android.

In the portable project, when editing the xaml file I added this button:

<Button 
    x:Name="Marker_Detection" 
    Text="Marker Detection" 
    Grid.Row="0" 
    Grid.Column="0" />

All goes well.

Then I added the click name function for the button:

<Button 
    x:Name="Marker_Detection" 
    Text="Marker Detection" 
    Grid.Row="0" 
    Grid.Column="0" 
    Click="MarkerDetectionClick" />

The project builds fine, but crashes in the execution. It stops at the line below, in the file App.gics :

#if DEBUG && !DISABLE_XAML_GENERATED_BREAK_ON_UNHANDLED_EXCEPTION
        UnhandledException += (sender, e) =>
        {
        --->STOP HERE--->   
            if (global::System.Diagnostics.Debugger.IsAttached) 
                global::System.Diagnostics.Debugger.Break();
        };
#endif
}

What is the solution for the this problem?

Answer 1

The event is called Clicked, not Click in Xamarin Forms, so your XAML is invalid, and that's why it's failing. This should work:

<Button 
x:Name="Marker_Detection" 
Text="Marker Detection" 
Grid.Row="0" 
Grid.Column="0" 
Clicked="MarkerDetectionClick" />

You may want to set your debugging settings to break when an exception is thrown, it should give you more information about the real problem when things like this happen. Here is some info on how to do this in Visual Studio, I assume Xamarin Studio has similar settings if you're using that.

https://msdn.microsoft.com/en-us/library/x85tt0dd.aspx