我从Windows“programms安装”图标中删除了IIS Express，因为我只想使用完整的IIS，它也是从“programm安装”激活的。
然后我加载了我的VS解决方案。 Web Api项目未加载，因为为IIS Express配置的项目显示错误消息。
当我检查.csproj文件时，我删除了有关IIS Express的任何内容。
但是仍然有这个内容我得到了这个错误，为什么？
唯一与此相关的IIS是：
<UseIIS>True</UseIIS>
它不是关于IIS表达的。它是完整的IIS。
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<Compile Include="App_Start\JsonContentNegotiator.cs" />
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<Compile Include="App_Start\WebApiConfig.cs" />
<Compile Include="App_Start\WebServicesConfig.cs" />
<Compile Include="Infrastructure\GlobalExceptionHandler.cs" />
<Compile Include="Infrastructure\GlobalExceptionLogger.cs" />
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<Compile Include="Controllers\AccountController.cs" />
<Compile Include="Controllers\HomeController.cs" />
<Compile Include="Controllers\SchoolclassCodesController.cs" />
<Compile Include="Controllers\PupilsController.cs" />
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Other similar extension points exist, see Microsoft.Common.targets.
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<Target Name="AfterBuild">
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