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使用源代码调试Xamarin Forms应用程序

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我一直在使用Xamarin Forms和MVVMCross库开发我的应用程序，我遇到了一个错误，导致Xamarin.Forms . 我以为我会下载Xamarin Forms的源代码并进行调试 . 我已经克隆了git存储库，然后将这些项目添加到我的解决方案中：

  • Xamarin.Forms.Core

  • Xamarin.Forms.Maps

  • Xamarin.Forms.Maps.Android

  • Xamarin.Forms.Platform

  • Xamarin.Forms.Platform.Android

  • Xamarin.Forms.Platform.Android（货运代理）

  • Xamarin.Forms.Platform.Android.FormsViewGroup

  • Xamarin.Forms.Xaml

我删除了这些库的NuGet引用并替换了我的项目中的引用 . 应用程序正在构建，此时一切正常，但当我将其部署到模拟器时，应用程序崩溃 . 这是stacktrace：

android.runtime.JavaProxyThrowable：System.ArgumentException：element的类型不是Xamarin.Forms.View参数名称：元素在Xamarin.Forms.Platform.Android.VisualElementRenderer`1 [TElement] .Xamarin.Forms.Platform.Android.IVisualElementRenderer F：\ workspace \ Xamarin.Forms \ Xamarin.Forms.Platform.Android \ VisualElementRenderer.cs：139中的.SetElement（Xamarin.Forms.VisualElement元素）[0x00011]，位于Xamarin.Forms.Platform.Android.Platform.CreateRenderer（Xamarin） .Forms.VisualElement元素）[0x00022]在F：\ workspace \ Xamarin.Forms \ Xamarin.Forms.Platform.Android \ Platform.cs：289 at Xamarin.Forms.Platform.Android.Platform.AddChild（Xamarin.Forms.VisualElement）视图，System.Boolean布局）[0x0001d]在F：\ workspace \ Xamarin.Forms \ Xamarin.Forms.Platform.Android \ Platform.cs：530中的Xamarin.Forms.Platform.Android.Platform.SetPage（Xamarin.Forms . 页面newRoot）[0x000a2]在F：\ workspace \ Xamarin.Forms \ Xamarin.Forms.Platform.Android \ Platform.cs：414在Xamarin.Forms.Platform.Android.FormsApplicationAc tivity.Inte在md59d637456c2e899bd4a90a05345a07db3.MvxFormsApplicationActivity.n_onCreate（本机方法）在md59d637456c2e899bd4a90a05345a07db3.MvxFormsApplicationActivity.onCreate（MvxFormsApplicationActivity.java:31）在android.app.Activity.performCreate（Activity.java:5231）在android.app.Instrumentation.callActivityOnCreate（ Instrumentation.java:1087）android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2148），android.app.A活动，活动传递活动（ActivityThread.java：2233），位于android.app.ActivityThread.access $ 800（ActivityThread.java： 135）在Android.app.Loper.loop（Looper.java:136）的android.app.Handler.dispatchMessage（Handler.java:102）上的android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1196）处android.app.ActivityThread.main（ActivityThread.java:5001）位于com.android的java.lang.reflect.Method.invoke（Method.java:515）的java.lang.reflect.Method.invokeNative（Native Method）中 . internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:785)a t com.android.internal.os.ZygoteInit.main（ZygoteInit.java:601）at dalvik.system.NativeStart.main（Native Method）

它看起来像Xamarin找不到 NavigationPage 类的视图rednerer . 我正在使用Xamarin.Android 7.0和Java 8进行编译 .

c# android xamarin xamarin.android xamarin.forms

1 回答

  • 0

    我终于想出了如何运行我的应用程序 . 我发现，在Xamarin.Forms.Platform.Android命名空间的AssemblyInfo类中，我已经灰显了属性，这些属性告诉应用程序为视图注册渲染器 . 这就是我所说的：

    #if ROOT_RENDERERS
[assembly: ExportRenderer (typeof (BoxView), typeof (BoxRenderer))]
[assembly: ExportRenderer (typeof (Entry), typeof (EntryRenderer))]
[assembly: ExportRenderer (typeof (Editor), typeof (EditorRenderer))]
[assembly: ExportRenderer (typeof (Label), typeof (LabelRenderer))]
[assembly: ExportRenderer (typeof (Image), typeof (ImageRenderer))]
[assembly: ExportRenderer (typeof (Button), typeof (ButtonRenderer))]
[assembly: ExportRenderer (typeof (TableView), typeof (TableViewRenderer))]
[assembly: ExportRenderer (typeof (ListView), typeof (ListViewRenderer))]
[assembly: ExportRenderer (typeof (Slider), typeof (SliderRenderer))]
[assembly: ExportRenderer (typeof (WebView), typeof (WebViewRenderer))]
[assembly: ExportRenderer (typeof (SearchBar), typeof (SearchBarRenderer))]
[assembly: ExportRenderer (typeof (Switch), typeof (SwitchRenderer))]
[assembly: ExportRenderer (typeof (DatePicker), typeof (DatePickerRenderer))]
[assembly: ExportRenderer (typeof (TimePicker), typeof (TimePickerRenderer))]
[assembly: ExportRenderer (typeof (Picker), typeof (PickerRenderer))]
[assembly: ExportRenderer (typeof (Stepper), typeof (StepperRenderer))]
[assembly: ExportRenderer (typeof (ProgressBar), typeof (ProgressBarRenderer))]
[assembly: ExportRenderer (typeof (ScrollView), typeof (ScrollViewRenderer))]
[assembly: ExportRenderer (typeof (Toolbar), typeof (ToolbarRenderer))]
[assembly: ExportRenderer (typeof (ActivityIndicator), typeof (ActivityIndicatorRenderer))]
[assembly: ExportRenderer (typeof (Frame), typeof (FrameRenderer))]
[assembly: ExportRenderer (typeof (NavigationMenu), typeof (NavigationMenuRenderer))]
[assembly: ExportRenderer (typeof (OpenGLView), typeof (OpenGLViewRenderer))]

[assembly: ExportRenderer (typeof (TabbedPage), typeof (TabbedRenderer))]
[assembly: ExportRenderer (typeof (NavigationPage), typeof (NavigationRenderer))]
[assembly: ExportRenderer (typeof (CarouselPage), typeof (CarouselPageRenderer))]
[assembly: ExportRenderer (typeof (Page), typeof (PageRenderer))]
[assembly: ExportRenderer (typeof (MasterDetailPage), typeof (MasterDetailRenderer))]
#endif

    当我评论这个编译条件时，一切顺利 .

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