通过Visual Studio 2015启动Xamarin Android应用程序时，我面临NullReferenceException。
在我的主要活动中离开OnCreate（）之后抛出它，但我不知道在哪里以及为什么。如何找到有关此错误的更多信息？
Debug输出如下：
05-21 20:18:51.643 D/OpenGLRenderer(25574): Use EGL_SWAP_BEHAVIOR_PRESERVED: true
05-21 20:18:51.651 D/Atlas (25574): Validating map...
Unhandled Exception:
System.NullReferenceException: Object reference not set to an instance of an object
Exception:
System.NullReferenceException: Object reference not set to an instance of an object
05-21 20:19:37.436 D/Mono (25574): DllImport attempting to load: '/system/lib/liblog.so'.
05-21 20:19:37.436 D/Mono (25574): DllImport loaded library '/system/lib/liblog.so'.
05-21 20:19:37.436 D/Mono (25574): DllImport searching in: '/system/lib/liblog.so' ('/system/lib/liblog.so').
05-21 20:19:37.436 D/Mono (25574): Searching for '__android_log_print'.
05-21 20:19:37.436 D/Mono (25574): Probing '__android_log_print'.
05-21 20:19:37.437 D/Mono (25574): Found as '__android_log_print'.
05-21 20:19:37.450 I/MonoDroid(25574): UNHANDLED EXCEPTION:
05-21 20:19:37.454 I/MonoDroid(25574): System.NullReferenceException: Object reference not set to an instance of an object
05-21 20:19:37.454 I/MonoDroid(25574): at Xamarin.Forms.Platform.Android.KeyboardManager.HideKeyboard (Android.Views.View inputView, Boolean overrideValidation) [0x00000] in C:\BuildAgent3\work\aad494dc9bc9783\Xamarin.Forms.Platform.Android\KeyboardManager.cs:14
05-21 20:19:37.454 I/MonoDroid(25574): at Xamarin.Forms.Platform.Android.FormsApplicationActivity.OnPause () [0x00000] in C:\BuildAgent3\work\aad494dc9bc9783\Xamarin.Forms.Platform.Android\FormsApplicationActivity.cs:153
05-21 20:19:37.455 I/MonoDroid(25574): at Android.App.Activity.n_OnPause (IntPtr jnienv, IntPtr native__this) [0x00009] in /Users/builder/data/lanes/3236/ee215fc9/source/monodroid/src/Mono.Android/platforms/android-23/src/generated/Android.App.Activity.cs:4046
05-21 20:19:37.455 I/MonoDroid(25574): at (wrapper dynamic-method) System.Object:5c198319-5b9a-4152-9518-5aa3ce7cab6e (intptr,intptr)
05-21 20:19:37.476 W/art (25574): JNI RegisterNativeMethods: attempt to register 0 native methods for md52ce486a14f4bcd95899665e9d932190b.JavaProxyThrowable
An unhandled exception occured.
05-21 20:19:38.791 E/mono (25574):
05-21 20:19:38.791 E/mono (25574): Unhandled Exception:
05-21 20:19:38.791 E/mono (25574): System.NullReferenceException: Object reference not set to an instance of an object
05-21 20:19:38.791 E/mono (25574): at (wrapper dynamic-method) System.Object:5c198319-5b9a-4152-9518-5aa3ce7cab6e (intptr,intptr)
05-21 20:19:38.791 E/mono (25574): at (wrapper native-to-managed) System.Object:5c198319-5b9a-4152-9518-5aa3ce7cab6e (intptr,intptr)
05-21 20:19:38.792 E/mono-rt (25574): [ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object
05-21 20:19:38.792 E/mono-rt (25574): at (wrapper dynamic-method) System.Object:5c198319-5b9a-4152-9518-5aa3ce7cab6e (intptr,intptr)
05-21 20:19:38.792 E/mono-rt (25574): at (wrapper native-to-managed) System.Object:5c198319-5b9a-4152-9518-5aa3ce7cab6e (intptr,intptr)
referenceTable GDEF length=670 1
referenceTable GSUB length=7202 1
referenceTable GPOS length=24560 1
答案 0 :(得分：1)
我知道已经有一段时间了，但也许我可以在将来帮助某人。当我在应用程序启动时意外删除了我的App.Current.Mainpage的启动时，发生了类似的事情。愚蠢的错误会导致无用的错误信息。
从这里了解我的问题所在：https://bugzilla.xamarin.com/show_bug.cgi?id=36287