Xamarin 从一开始就形成许多错误

debugcn 发表于 Dev

瓦西里希腊

在 VS 2017 中安装 Xamarin 并在 app.xaml.cs 中创建跨平台项目后，我有十个错误和九个警告（没有做任何事情）。我已经进行了搜索，我找到了将 xamarin 表单更新到最新版本的解决方案，但 xamarin 表单的最新版本为 2.5.0.28

我得到的错误和警告：

Severity    Code    Description Project File    Line    Suppression State
Error   CS0234  The type or namespace name 'Forms' does not exist in the namespace 'Xamarin' (are you missing an assembly reference?)   App1.Android    C:\Users\vtsou_000\source\repos\App1\App1\App1\App.xaml.cs  6   Active
Error   CS0246  The type or namespace name 'Application' could not be found (are you missing a using directive or an assembly reference?)   App1.Android, App1.iOS  C:\Users\vtsou_000\source\repos\App1\App1\App1\App.xaml.cs  10  Active
Error   CS0115  'App.OnStart()': no suitable method found to override   App1.Android, App1.iOS  C:\Users\vtsou_000\source\repos\App1\App1\App1\App.xaml.cs  19  Active
Error   CS0115  'App.OnSleep()': no suitable method found to override   App1.Android, App1.iOS  C:\Users\vtsou_000\source\repos\App1\App1\App1\App.xaml.cs  24  Active
Error   CS0115  'App.OnResume()': no suitable method found to override  App1.Android, App1.iOS  C:\Users\vtsou_000\source\repos\App1\App1\App1\App.xaml.cs  29  Active
Error   CS0246  The type or namespace name 'Xamarin' could not be found (are you missing a using directive or an assembly reference?)   App1.iOS    C:\Users\vtsou_000\source\repos\App1\App1\App1\App.xaml.cs  6   Active
Error   CS0103  The name 'InitializeComponent' does not exist in the current context    App1.Android, App1.iOS  C:\Users\vtsou_000\source\repos\App1\App1\App1\App.xaml.cs  14  Active
Error   CS0118  'MainPage' is a type but is used like a variable    App1.Android, App1.iOS  C:\Users\vtsou_000\source\repos\App1\App1\App1\App.xaml.cs  16  Active
Error       The type 'Application' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built. App1.iOS    C:\Users\vtsou_000\source\repos\App1\App1\App1\App.xaml 2   
Error       The attachable property 'Resources' was not found in type 'Application'.    App1.iOS    C:\Users\vtsou_000\source\repos\App1\App1\App1\App.xaml 5   
Warning     No resource found that matches the given name: attr 'windowNoTitle'.    App1.Android    C:\Users\vtsou_000\source\repos\App1\App1\App1.Android\Resources\values\styles.xml  2   
Warning     Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light.DarkActionBar'.  App1.Android    C:\Users\vtsou_000\source\repos\App1\App1\App1.Android\Resources\values\styles.xml  2   
Warning     No resource found that matches the given name: attr 'windowActionBar'.  App1.Android    C:\Users\vtsou_000\source\repos\App1\App1\App1.Android\Resources\values\styles.xml  2   
Warning     No resource found that matches the given name: attr 'colorPrimary'. App1.Android    C:\Users\vtsou_000\source\repos\App1\App1\App1.Android\Resources\values\styles.xml  2   
Warning     No resource found that matches the given name: attr 'colorPrimaryDark'. App1.Android    C:\Users\vtsou_000\source\repos\App1\App1\App1.Android\Resources\values\styles.xml  2   
Warning     No resource found that matches the given name: attr 'colorAccent'.  App1.Android    C:\Users\vtsou_000\source\repos\App1\App1\App1.Android\Resources\values\styles.xml  3   
Warning     No resource found that matches the given name: attr 'colorAccent'.  App1.Android    C:\Users\vtsou_000\source\repos\App1\App1\App1.Android\Resources\values\styles.xml  4   
Warning     No resource found that matches the given name: attr 'windowActionModeOverlay'.  App1.Android    C:\Users\vtsou_000\source\repos\App1\App1\App1.Android\Resources\values\styles.xml  4   
Warning     Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light.Dialog'. App1.Android    C:\Users\vtsou_000\source\repos\App1\App1\App1.Android\Resources\values\styles.xml  4

我是 Xamarin 的新开发人员，所以我不知道该怎么做。

重新启动 VS 2017 后，旧错误消失了，但我仍然收到新错误：

[I:sdk]:                    Key HKCU\SOFTWARE\Xamarin\VisualStudio\15.0_efe5e5bc\Android\AndroidSdkDirectory found:
    Path contains adb in \platform-tools (C:\Program Files (x86)\Android\android-sdk).
[I:sdk]:                    Key HKCU\SOFTWARE\Xamarin\VisualStudio\15.0_efe5e5bc\Android\AndroidNdkDirectory found:
    Path contains ndk-stack in \. (C:\ProgramData\Microsoft\AndroidNDK64\android-ndk-r13b).
[I:sdk]:                    Key HKCU\SOFTWARE\Xamarin\VisualStudio\15.0_efe5e5bc\Android\JavaSdkDirectory found:
    Path contains jarsigner.exe in \bin (C:\Program Files\Java\jdk1.8.0_131).
[I:]:                     Found Xamarin.Android 8.2.0.15
[I:]:                     Found Android SDK. API levels: 25, 26
[I:]:                     Found Xamarin.Android 8.2.0.15
[I:sdk]:                  Runtime path: C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\Xamarin\Android
[I:sdk]:                  Framework path: C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v1.0
[I:]:                     Tracking android devices started
[D:]:                     TrackDeviceTask got: 
[I:]:                     Got new device list from adb with 0 devices
[D:]:                     live player watcher: got device list from live player with 1 devices
[D:]:                     Tracking avd started
[D:]:                     avd watcher *.ini path: 'C:\Users\vtsou_000\.android\avd'
[D:]:                     avd watcher: got device list from avd with 5 devices
[E:]:                     an error occurred loading avd `Android_Accelerated_Nougat`, the system image does not exists
[E:]:                     an error occurred loading avd `Android_ARM_Nougat`, the system image does not exists
[E:]:                     an error occurred loading avd `Nexus_5_API_24`, the system image does not exists
[E:]:                     an error occurred loading avd `Nexus_5_API_25`, the system image does not exists

还有一个错误：

Severity    Code    Description Project File    Line    Suppression State
Error   CS0103  The name 'InitializeComponent' does not exist in the current context    App1.Android, App1.iOS  C:\Users\vtsou_000\source\repos\App1\App1\App1\App.xaml.cs  14  Active

瓦西里希腊

经过多次尝试，我想出了如何解决我的问题：

从 bin 和 obj 中删除文件是完全没有必要的，我的问题并没有消失。

我做的第一件事是构建解决方案。

第二种是从android卸载并重新加载解决方案。在此之后，我的代码中没有错误。

此外，sdk 工具设置不正确，模拟器无法正常工作。所以你必须安装它们。另一件事是在所有 xaml 文件上共享变量。右键单击属性并将内置操作设置为内容，然后再次设置为嵌入式资源。

正如我从一开始就说了太多错误。Microsoft 开发人员必须解决这些问题。

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