如何读取 Xamarin 中的链接器错误

Question

在发布模式下执行我的 Xamarin Android 应用程序时出现以下错误。我想 LinkerPleaseInclude.cs 中缺少某些内容，但错误消息不是很有帮助。

09-25 16:17:38.140 W/art     ( 1082): JNI RegisterNativeMethods: attempt to register 0 native methods for mvvmcross.binding.droid.views.MvxRadioGroup
[0:] MvxBind:Error:  2,89 Exception thrown during the view binding ArgumentNullException: missing source event info in MvxWeakEventSubscription
Parameter name: sourceEventInfo
      at MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`2[TSource,TEventArgs]..ctor (Android.Widget.TextView source, System.Reflection.EventInfo sourceEventInfo, System.EventHandler`1[TEventArgs] targetEventHandler) [0x00017] in <54d9eb77c4d448d4bc5e7c7a5cdd0a97>:0 
  at MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`2[TSource,TEventArgs]..ctor (Android.Widget.TextView source, System.String sourceEventName, System.EventHandler`1[TEventArgs] targetEventHandler) [0x00012] in <54d9eb77c4d448d4bc5e7c7a5cdd0a97>:0 
  at MvvmCross.Platform.WeakSubscription.MvxWeakSubscriptionExtensionMethods.WeakSubscribe[TSource,TEventArgs] (TSource source, System.String eventName, System.EventHandler`1[TEventArgs] eventHandler) [0x00000] in <54d9eb77c4d448d4bc5e7c7a5cdd0a97>:0 
  at MvvmCross.Binding.Droid.Target.MvxTextViewTextTargetBinding.SubscribeToEvents () [0x0000b] in <cc9453c0f5794d529a8b1975bb62dd40>:0 
  at MvvmCross.Binding.Bindings.MvxFullBinding.CreateTargetBinding (System.Object target) [0x00057] in <5d9349f2d9c240e38eaeca40fe71d977>:0 
  at MvvmCross.Binding.Bindings.MvxFullBinding..ctor (MvvmCross.Binding.MvxBindingRequest bindingRequest) [0x0002f] in <5d9349f2d9c240e38eaeca40fe71d977>:0 
  at MvvmCross.Binding.Binders.MvxFromTextBinder.BindSingle (MvvmCross.Binding.MvxBindingRequest bindingRequest) [0x00000] in <5d9349f2d9c240e38eaeca40fe71d977>:0 
  at MvvmCross.Binding.Binders.MvxFromTextBinder+<>c__DisplayClass2_0.<Bind>b__0 (MvvmCross.Binding.Bindings.MvxBindingDescription description) [0x00018] in <5d9349f2d9c240e38eaeca40fe71d977>:0 
  at System.Linq.Utilities+<>c__DisplayClass2_0`3[TSource,TMiddle,TResult].<CombineSelectors>b__0 (TSource x) [0x00012] in <9ecdeee51aa740839577d6db9550e95f>:0 
  at System.Linq.Utilities+<>c__DisplayClass2_0`3[TSource,TMiddle,TResult].<CombineSelectors>b__0 (TSource x) [0x00000] in <9ecdeee51aa740839577d6db9550e95f>:0 
  at (wrapper delegate-invoke) System.Func`2[System.Collections.Generic.KeyValuePair`2[System.String,MvvmCross.Binding.Parse.Binding.MvxSerializableBindingDescription],System.Collections.Generic.KeyValuePair`2[System.Object,MvvmCross.Binding.Bindings.IMvxUpdateableBinding]]:invoke_TResult_T (System.Collections.Generic.KeyValuePair`2<string, MvvmCross.Binding.Parse.Binding.MvxSerializableBindingDescription>)
  at System.Linq.Enumerable+SelectEnumerableIterator`2[TSource,TResult].MoveNext () [0x00048] in <9ecdeee51aa740839577d6db9550e95f>:0 
  at System.Collections.Generic.List`1[T].InsertRange (System.Int32 index, System.Collections.Generic.IEnumerable`1[T] collection) [0x000ea] in <b2855d13f99e445b95990a59348d98e8>:0 
  at System.Collections.Generic.List`1[T].AddRange (System.Collections.Generic.IEnumerable`1[T] collection) [0x00000] in <b2855d13f99e445b95990a59348d98e8>:0 
  at MvvmCross.Binding.Droid.Binders.MvxAndroidViewBinder.StoreBindings (Android.Views.View view, System.Collections.Generic.IEnumerable`1[T] newBindings) [0x00028] in <cc9453c0f5794d529a8b1975bb62dd40>:0 
  at MvvmCross.Binding.Droid.Binders.MvxAndroidViewBinder.ApplyBindingsFromAttribute (Android.Views.View view, Android.Content.Res.TypedArray typedArray, System.Int32 attributeId) [0x0001c] in <cc9453c0f5794d529a8b1975bb62dd40>:0

我明白了，MvxRadioGroup 缺少一些东西。我如何找出要在 LinkerPleaseInclude 中添加的内容？

我对 MvxRadioGroup 的绑定如下：

<MvxRadioGroup
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:layout_marginTop="6dp"
    local:MvxBind="ItemsSource GenderAnswers; SelectedItem GenderAnswer"
    local:MvxItemTemplate="@layout/radioitem_enum" />

我的 LinkerPleaseInclude 仍然是空的。

这是视图模型中属性的定义：

public IEnumerable<GenderQuestionAnswers> GenderAnswers => Enum.GetValues(typeof(GenderQuestionAnswers)).Cast<GenderQuestionAnswers>();

public GenderQuestionAnswers? GenderAnswer
{
    get => _genderAnswer;
    set => SetProperty(ref _genderAnswer, value);
}

[编辑 2017-09-27]：添加了 MvxRadioGroup 绑定的代码

[编辑 2017-09-27]：在视图模型中添加了属性片段

Answer 1

除了 @york-shen-msft

提到的文件之外，我最终将这些行添加到 LinkerPleaseInclude

public void Include(RadioButton radioButton)
{
    radioButton.CheckedChange += (sender, args) => radioButton.Checked = args.IsChecked
}

好吧，这并没有真正回答我的问题，因为我想知道如何找到正确的解决方案，而无需在整个互联网上搜索其他人之前包含的行并进行反复试验，但它解决了我的实际问题片刻。

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