mvvmcross Android. Cannot access a disposed object on Enabled Binding

Question

After repeating visiting screen, I get next error:

System.ObjectDisposedException: Cannot access a disposed object. at Java.Interop.JniPeerMembers.AssertSelf (Java.Interop.IJavaPeerable self) [0x00029] in <286213b9e14c442ba8d8d94cc9dbec8e>:0 07-03 11:29:51.230 I/MonoDroid(20631): at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeVirtualVoidMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x00000] in <286213b9e14c442ba8d8d94cc9dbec8e>:0 07-03 11:29:51.230 I/MonoDroid(20631): at Android.Views.View.set_Enabled (System.Boolean value) [0x00022] in :0 07-03 11:29:51.230 I/MonoDroid(20631): at MvvmCross.Platforms.Android.Binding.Target.MvxViewClickBinding.RefreshEnabledState () [0x00022] in C:\projects\mvvmcross\MvvmCross\Platforms\Android\Binding\Target\MvxViewClickBinding.cs:64 07-03 11:29:51.230 I/MonoDroid(20631): at MvvmCross.Platforms.Android.Binding.Target.MvxViewClickBinding.OnCanExecuteChanged (System.Object sender, System.EventArgs e) [0x00000] in C:\projects\mvvmcross\MvvmCross\Platforms\Android\Binding\Target\MvxViewClickBinding.cs:69 07-03 11:29:51.230 I/MonoDroid(20631): at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke(System.Reflection.MonoMethod,object,object[],System.Exception&) 07-03 11:29:51.230 I/MonoDroid(20631): at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0003b] in :0 07-03 11:29:51.230 I/MonoDroid(20631): --- End of inner exception stack trace --- 07-03 11:29:51.230 I/MonoDroid(20631): at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00054] in :0 07-03 11:29:51.230 I/MonoDroid(20631): at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in :0 07-03 11:29:51.230 I/MonoDroid(20631): at MvvmCross.WeakSubscription.MvxWeakEventSubscription`2[TSource,TEventArgs].OnSourceEvent (System.Object sender, TEventArgs e) [0x0000a] in C:\projects\mvvmcross\MvvmCross\WeakSubscription\MvxWeakEventSubscription.cs:74 07-03 11:29:51.230 I/MonoDroid(20631): at MvvmCross.Commands.MvxWeakCommandHelper.RaiseCanExecuteChanged (System.Object sender) [0x00014] in C:\projects\mvvmcross\MvvmCross\Commands\MvxCommand.cs:96 07-03 11:29:51.230 I/MonoDroid(20631): at MvvmCross.Commands.MvxCommandBase.b__9_0 () [0x00000] in C:\projects\mvvmcross\MvvmCross\Commands\MvxCommand.cs:135

Not sure, if this android or mvvmcross issue. Can I avoid invoking view in MvxViewClickBinding, if it disposed?

Raimo Raimo · Accepted Answer · 2019-07-03T09:07:55

I guess you could write a static extension method for Java.Lang.Object like below:

public static class ObjectExtensions
{
    public static bool IsDisposedOrNull(this Object objectValue)
    {
        return objectValue?.Handle == IntPtr.Zero;
    }
}

mvvmcross Android. Cannot access a disposed object on Enabled Binding

1 Answers