问题
I receive the following error message when opening layout files in F# project.
System.NullReferenceException: Object reference not set to an instance of an object. at Xamarin.VisualStudio.Android.MonoAndroidDesignerInterface.VisualStudioCodeModelBridge.get_EnclosingProject() in c:\Users\builder\data\lanes\3822\3b7df6f5\source\xamarinvs\src\Core\VisualStudio.Android\Designer\MonoAndroidDesignerInterface.cs:line 180 at Xamarin.AndroidDesigner.CodeInteractions.CodeModelBridge.d__12.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Xamarin.AndroidDesigner.CodeInteractions.CodeModelBridge.d__27.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Xamarin.AndroidDesigner.DesignerProject.d__175.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Xamarin.AndroidDesigner.DesignerProject.d__139.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Xamarin.AndroidDesigner.AndroidRenderSession.d__105.MoveNext()`
Never had this problem before, until I updated Xamarin to the latest version. I've found related bug here https://bugzilla.xamarin.com/show_bug.cgi?id=44956, but it says that it's a duplicate of another one which is https://bugzilla.xamarin.com/show_bug.cgi?id=44797, but I can't access it.
回答1:
As mentioned, this appears to be public bug report 44956, which is currently under investigation. Bug 44797 was filed as a private issue by the individual reporting it; as such, only the original reporter and the Xamarin team can access it.
The private bug has been closed as a duplicate of this public report, so future updates on the status of the bug from the Xamarin team will be made via Bug 44956.
来源：https://stackoverflow.com/questions/40070400/xamarin-android-exception-when-opening-axml-files-in-vs2015-using-f