创建一个新的Mobile.App（Xamarin.Forms）项目，尝试编译，但“链接引用失败”

Question

我已经在16.2.3Xamarin上安装了最新的Visual Studio 2019（）社区版。

当我使用Mobile App (Xamarin.Forms)模板创建全新的解决方案并选择Android时，无法在任何配置中进行构建。

它最终显示为以下输出：

1>"C:\Users\myuser\source\repos\App3\App3\App3.Android\App3.Android.csproj" (Build;BuiltProjectOutputGroup;BuiltProjectOutputGroupDependencies;DebugSymbolsProjectOutputGroup;DebugSymbolsProjectOutputGroupDependencies;DocumentationProjectOutputGroup;DocumentationProjectOutputGroupDependencies;SatelliteDllsProjectOutputGroup;SatelliteDllsProjectOutputGroupDependencies;SGenFilesOutputGroup;SGenFilesOutputGroupDependencies target) (1) ->
1>(_UpdateAndroidResgen target) -> 
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1697,2): error APT0000: resource style/Theme.AppCompat.Light.Dialog (aka com.companyname.app3:style/Theme.AppCompat.Light.Dialog) not found.
1>  C:\Users\myuser\source\repos\App3\App3\App3.Android\Resources\values\styles.xml(4): error APT0000: style attribute 'attr/colorAccent (aka com.companyname.app3:attr/colorAccent)' not found.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1697,2): error APT0000: resource style/Theme.AppCompat.Light.DarkActionBar (aka com.companyname.app3:style/Theme.AppCompat.Light.DarkActionBar) not found.
1>  C:\Users\myuser\source\repos\App3\App3\App3.Android\Resources\values\styles.xml(2): error APT0000: style attribute 'attr/windowNoTitle (aka com.companyname.app3:attr/windowNoTitle)' not found.
1>  C:\Users\myuser\source\repos\App3\App3\App3.Android\Resources\values\styles.xml(2): error APT0000: style attribute 'attr/windowActionBar (aka com.companyname.app3:attr/windowActionBar)' not found.
1>  C:\Users\myuser\source\repos\App3\App3\App3.Android\Resources\values\styles.xml(2): error APT0000: style attribute 'attr/colorPrimary (aka com.companyname.app3:attr/colorPrimary)' not found.
1>  C:\Users\myuser\source\repos\App3\App3\App3.Android\Resources\values\styles.xml(2): error APT0000: style attribute 'attr/colorPrimaryDark (aka com.companyname.app3:attr/colorPrimaryDark)' not found.
1>  C:\Users\myuser\source\repos\App3\App3\App3.Android\Resources\values\styles.xml(3): error APT0000: style attribute 'attr/colorAccent (aka com.companyname.app3:attr/colorAccent)' not found.
1>  C:\Users\myuser\source\repos\App3\App3\App3.Android\Resources\values\styles.xml(4): error APT0000: style attribute 'attr/windowActionModeOverlay (aka com.companyname.app3:attr/windowActionModeOverlay)' not found.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1697,2): error APT0000: failed linking references.

App3.Android.csproj中引用的包如下：

1>"C:\Users\myuser\source\repos\App3\App3\App3.Android\App3.Android.csproj" (Build;BuiltProjectOutputGroup;BuiltProjectOutputGroupDependencies;DebugSymbolsProjectOutputGroup;DebugSymbolsProjectOutputGroupDependencies;DocumentationProjectOutputGroup;DocumentationProjectOutputGroupDependencies;SatelliteDllsProjectOutputGroup;SatelliteDllsProjectOutputGroupDependencies;SGenFilesOutputGroup;SGenFilesOutputGroupDependencies target) (1) ->
1>(_UpdateAndroidResgen target) -> 
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1697,2): error APT0000: resource style/Theme.AppCompat.Light.Dialog (aka com.companyname.app3:style/Theme.AppCompat.Light.Dialog) not found.
1>  C:\Users\myuser\source\repos\App3\App3\App3.Android\Resources\values\styles.xml(4): error APT0000: style attribute 'attr/colorAccent (aka com.companyname.app3:attr/colorAccent)' not found.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1697,2): error APT0000: resource style/Theme.AppCompat.Light.DarkActionBar (aka com.companyname.app3:style/Theme.AppCompat.Light.DarkActionBar) not found.
1>  C:\Users\myuser\source\repos\App3\App3\App3.Android\Resources\values\styles.xml(2): error APT0000: style attribute 'attr/windowNoTitle (aka com.companyname.app3:attr/windowNoTitle)' not found.
1>  C:\Users\myuser\source\repos\App3\App3\App3.Android\Resources\values\styles.xml(2): error APT0000: style attribute 'attr/windowActionBar (aka com.companyname.app3:attr/windowActionBar)' not found.
1>  C:\Users\myuser\source\repos\App3\App3\App3.Android\Resources\values\styles.xml(2): error APT0000: style attribute 'attr/colorPrimary (aka com.companyname.app3:attr/colorPrimary)' not found.
1>  C:\Users\myuser\source\repos\App3\App3\App3.Android\Resources\values\styles.xml(2): error APT0000: style attribute 'attr/colorPrimaryDark (aka com.companyname.app3:attr/colorPrimaryDark)' not found.
1>  C:\Users\myuser\source\repos\App3\App3\App3.Android\Resources\values\styles.xml(3): error APT0000: style attribute 'attr/colorAccent (aka com.companyname.app3:attr/colorAccent)' not found.
1>  C:\Users\myuser\source\repos\App3\App3\App3.Android\Resources\values\styles.xml(4): error APT0000: style attribute 'attr/windowActionModeOverlay (aka com.companyname.app3:attr/windowActionModeOverlay)' not found.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1697,2): error APT0000: failed linking references.

最低Android版本为 Android 5.0 (API Level 21 - Lollipop)

目标Android版本为 Android 9.0 (API Level 28 - Pie)

Answer 1

无论出于何种原因，它都可以将自己锁定在此状态。

删除*\bin并*\obj解决问题。

Answer 2

按顺序执行此操作：

1. 删除bin和obj文件夹。
2. 重建解决方案