Realm Xamarin - Ошибка на GetInstance()

Question

Я поставил свою главную страницу таким образом:

namespace MyNamepage 
{ 
public partial class MyPage: ContentPage 
    { 
    private Realm realm; 
    public MyPage() 
    { 
     InitializeComponent(); 
     this.realm = Realm.GetInstance(); 
    } 
    } 
} 

Отладка Android проекта я получил эту ошибку и сбой приложения:

System.Reflection. TargetInvocationException: Исключение было выбрано мишенью вызова.

• Я установил «Сферу» в PCL и в Droid Project с помощью NuGet но это, кажется, не работает.
• Если я удалю вызов GetInstance(), приложение не сработает;

Стек след:

10-17 10:36:31.935 I/MonoDroid(31518): UNHANDLED EXCEPTION: 
10-17 10:36:31.955 I/MonoDroid(31518): System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.PlatformNotSupportedException: The PCL build of Realm is being linked which probably means you need to use NuGet or otherwise link a platform-specific Realm.dll to your main application. 
10-17 10:36:31.955 I/MonoDroid(31518): at Realms.RealmPCLHelpers.ThrowProxyShouldNeverBeUsed() [0x00000] in <filename unknown>:0 
10-17 10:36:31.955 I/MonoDroid(31518): at Realms.Realm.GetInstance (Realms.RealmConfiguration config) [0x00000] in <filename unknown>:0 
10-17 10:36:31.955 I/MonoDroid(31518): at MyPack.SidePage.MyPage..ctor() [0x00008] in C:\Users\User\documents\visual studio 2015\Projects\MyPack\MyPack\MyPack\SidePage\MyPage.xaml.cs:14 
10-17 10:36:31.955 I/MonoDroid(31518): at (wrapper managed-to-native) System.Reflection.MonoCMethod:InternalInvoke (System.Reflection.MonoCMethod,object,object[],System.Exception&) 
10-17 10:36:31.955 I/MonoDroid(31518): at System.Reflection.MonoCMethod.InternalInvoke (System.Object obj, System.Object[] parameters) [0x00002] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/mcs/class/corlib/System.Reflection/MonoMethod.cs:644 
10-17 10:36:31.965 I/MonoDroid(31518): --- End of inner exception stack trace --- 
10-17 10:36:31.965 I/MonoDroid(31518): at System.Reflection.MonoCMethod.InternalInvoke (System.Object obj, System.Object[] parameters) [0x00016] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/mcs/class/corlib/System.Reflection/MonoMethod.cs:650 
10-17 10:36:31.965 I/MonoDroid(31518): at System.RuntimeType.CreateInstanceMono (Boolean nonPublic) [0x000ca] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/mcs/class/corlib/ReferenceSources/RuntimeType.cs:115 
10-17 10:36:31.965 I/MonoDroid(31518): at System.RuntimeType.CreateInstanceSlow (Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, System.Threading.StackCrawlMark& stackMark) [0x0001a] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/mcs/class/corlib/ReferenceSources/RuntimeType.cs:89 
10-17 10:36:31.965 I/MonoDroid(31518): at System.RuntimeType.CreateInstanceDefaultCtor (Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, System.Threading.StackCrawlMark& stackMark) [0x0002a] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/external/referencesource/mscorlib/system/rttype.cs:5599 
10-17 10:36:31.965 I/MonoDroid(31518): at System.Activator.CreateInstance (System.Type type, Boolean nonPublic) [0x00040] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/external/referencesource/mscorlib/system/activator.cs:201 
10-17 10:36:31.965 I/MonoDroid(31518): at System.Activator.CreateInstance (System.Type type) [0x00000] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/external/referencesource/mscorlib/system/activator.cs:134 
10-17 10:36:31.965 I/MonoDroid(31518): at MyPack.MainPage.OnItemSelected (System.Object sender, Xamarin.Forms.SelectedItemChangedEventArgs e) [0x00016] in C:\Users\User\documents\visual studio 2015\Projects\MyPack\MyPack\MyPack\MainPage.xaml.cs:24 
10-17 10:36:31.965 I/MonoDroid(31518): at (wrapper delegate-invoke) System.EventHandler`1[Xamarin.Forms.SelectedItemChangedEventArgs]:invoke_void_object_TEventArgs (object,Xamarin.Forms.SelectedItemChangedEventArgs) 
10-17 10:36:31.975 I/MonoDroid(31518): at Xamarin.Forms.ListView.OnSelectedItemChanged (Xamarin.Forms.BindableObject bindable, System.Object oldValue, System.Object newValue) [0x0001c] in <filename unknown>:0 
10-17 10:36:31.975 I/MonoDroid(31518): at Xamarin.Forms.BindableObject.SetValueActual (Xamarin.Forms.BindableProperty property, Xamarin.Forms.BindablePropertyContext context, System.Object value, Boolean currentlyApplying, SetValueFlags attributes, Boolean silent) [0x0010e] in <filename unknown>:0 
10-17 10:36:31.975 I/MonoDroid(31518): at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, SetValueFlags attributes, SetValuePrivateFlags privateAttributes) [0x0014b] in <filename unknown>:0 
10-17 10:36:31.975 I/MonoDroid(31518): at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, SetValueFlags attributes) [0x00000] in <filename unknown>:0 
10-17 10:36:31.975 I/MonoDroid(31518): at Xamarin.Forms.ListView.NotifyRowTapped (Int32 groupIndex, Int32 inGroupIndex, Xamarin.Forms.Cell cell) [0x0004c] in <filename unknown>:0 
10-17 10:36:31.975 I/MonoDroid(31518): at Xamarin.Forms.ListView.NotifyRowTapped (Int32 index, Xamarin.Forms.Cell cell) [0x00023] in <filename unknown>:0 
10-17 10:36:31.975 I/MonoDroid(31518): at Xamarin.Forms.Platform.Android.ListViewAdapter.HandleItemClick (Android.Widget.AdapterView parent, Android.Views.View view, Int32 position, Int64 id) [0x00056] in <filename unknown>:0 
10-17 10:36:31.975 I/MonoDroid(31518): at Xamarin.Forms.Platform.Android.CellAdapter.OnItemClick (Android.Widget.AdapterView parent, Android.Views.View view, Int32 position, Int64 id) [0x0002e] in <filename unknown>:0 
10-17 10:36:31.975 I/MonoDroid(31518): at Android.Widget.AdapterView+IOnItemClickListenerInvoker.n_OnItemClick_Landroid_widget_AdapterView_Landroid_view_View_IJ (IntPtr jnienv, IntPtr native__this, IntPtr native_parent, IntPtr native_view, Int32 position, Int64 id) [0x00019] in /Users/builder/data/lanes/3415/7db2aac3/source/monodroid/src/Mono.Android/platforms/android-23/src/generated/Android.Widget.AdapterView.cs:215 
10-17 10:36:31.975 I/MonoDroid(31518): at (wrapper dynamic-method) System.Object:585983a8-79f2-48a3-ac33-5b4c905219f1 (intptr,intptr,intptr,intptr,int,long) 
10-17 10:36:31.995 D/Mono (31518): DllImport searching in: '__Internal' ('(null)'). 
10-17 10:36:31.995 D/Mono (31518): Searching for 'java_interop_jnienv_throw'. 
10-17 10:36:31.995 D/Mono (31518): Probing 'java_interop_jnienv_throw'. 
10-17 10:36:31.995 D/Mono (31518): Found as 'java_interop_jnienv_throw'. 
An unhandled exception occured. 

10-17 10:36:34.115 E/mono (31518): 
10-17 10:36:34.115 E/mono (31518): Unhandled Exception: 
10-17 10:36:34.115 E/mono (31518): System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.PlatformNotSupportedException: The PCL build of Realm is being linked which probably means you need to use NuGet or otherwise link a platform-specific Realm.dll to your main application. 
10-17 10:36:34.115 E/mono (31518): at Realms.RealmPCLHelpers.ThrowProxyShouldNeverBeUsed() [0x00000] in <filename unknown>:0 
10-17 10:36:34.115 E/mono (31518): at Realms.Realm.GetInstance (Realms.RealmConfiguration config) [0x00000] in <filename unknown>:0 
10-17 10:36:34.115 E/mono (31518): at MyPack.SidePage.MyPage..ctor() [0x00008] in C:\Users\User\documents\visual studio 2015\Projects\MyPack\MyPack\MyPack\SidePage\MyPage.xaml.cs:14 
10-17 10:36:34.115 E/mono (31518): at (wrapper managed-to-native) System.Reflection.MonoCMethod:InternalInvoke (System.Reflection.MonoCMethod,object,object[],System.Exception&) 
10-17 10:36:34.115 E/mono (31518): at System.Reflection.MonoCMethod.InternalInvoke (System.Object obj, System.Object[] parameters) [0x00002] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/mcs/class/corlib/System.Reflection/MonoMethod.cs:644 
10-17 10:36:34.115 E/mono (31518): --- End of inner exception stack trace --- 
10-17 10:36:34.115 E/mono (31518): at (wrapper dynamic-method) System.Object:585983a8-79f2-48a3-ac33-5b4c905219f1 (intptr,intptr,intptr,intptr,int,long) 
10-17 10:36:34.115 E/mono (31518): at (wrapper native-to-managed) System.Object:585983a8-79f2-48a3-ac33-5b4c905219f1 (intptr,intptr,intptr,intptr,int,long) 
10-17 10:36:34.115 E/mono-rt (31518): [ERROR] FATAL UNHANDLED EXCEPTION: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.PlatformNotSupportedException: The PCL build of Realm is being linked which probably means you need to use NuGet or otherwise link a platform-specific Realm.dll to your main application. 
10-17 10:36:34.115 E/mono-rt (31518): at Realms.RealmPCLHelpers.ThrowProxyShouldNeverBeUsed() [0x00000] in <filename unknown>:0 
10-17 10:36:34.115 E/mono-rt (31518): at Realms.Realm.GetInstance (Realms.RealmConfiguration config) [0x00000] in <filename unknown>:0 
10-17 10:36:34.115 E/mono-rt (31518): at MyPack.SidePage.MyPage..ctor() [0x00008] in C:\Users\User\documents\visual studio 2015\Projects\MyPack\MyPack\MyPack\SidePage\MyPage.xaml.cs:14 
10-17 10:36:34.115 E/mono-rt (31518): at (wrapper managed-to-native) System.Reflection.MonoCMethod:InternalInvoke (System.Reflection.MonoCMethod,object,object[],System.Exception&) 
10-17 10:36:34.115 E/mono-rt (31518): at System.Reflection.MonoCMethod.InternalInvoke (System.Object obj, System.Object[] parameters) [0x00002] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/mcs/class/corlib/System.Reflection/MonoMethod.cs:644 
10-17 10:36:34.115 E/mono-rt (31518): --- End of inner exception stack trace --- 
10-17 10:36:34.115 E/mono-rt (31518): at (wrapper dynamic-method) System.Object:585983a8-79f2-48a3-ac33-5b4c905219f1 (intptr,intptr,intptr,intptr,int,long) 
10-17 10:36:34.115 E/mono-rt (31518): at (wrapper native-to-managed) System.Object:585983a8-79f2-48a3-ac33-5b4c905219f1 (intptr,intptr,intptr,intptr,int,long) 
In mgmain JNI_OnLoad 

Answer 1

Как трассировки стека указывает и путь, который вы выложили в комментариях шоу. Вы установили версию PCL в проекты, специфичные для платформы. Именно поэтому он выбрасывает исключение PlatformNotSupportedException, которое вы получаете.

Попробуйте переустановить NuGet в своих конкретных проектах. В качестве альтернативы вы можете вручную изменить ссылку, чтобы указать на:

packages\Realm.0.78.1\lib\MonoAndroid44\Realm.dll 

Вы не должны иметь каких-либо ссылок на портативном папку в вашей платформы конкретного проекта.