ASP.NET Core MVC 中缺少类型/命名空间

Question

I've created an empty ASP.NET Core Mvc project in visual studio for Mac, added a few dependencies

• Microsoft.AspNetCore.Mvc (1.1.2)
• Microsoft.AspNetCore.Mvc.Core (1.1.2)

and also imported the namespaces. However, when I create a new HomeController class and try to inherit from the Controller class

public class HomeController : Controller

I get a red squiggle line and an error:

the type of namespace name 'Controller' could not be found".

Also, I can't seem to find the project.json and csproj files in my project.

Answer 1

You need to reference Microsoft.AspNetCore as well. This package contains references to a number of other packages that you need to build ASP.NET Core applications.

Try this working csproj file:

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp1.1</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="1.1.2" />
    <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="1.1.1" />
  </ItemGroup>

</Project>

Also, I can't seem to find the project.json and csproj files in my project.

project.json has been deprecated , so you won't see it in your project.

You do have a .csproj file, though. Visual Studio for Mac is representing it as the LanguageFeatures element in the tree view. You should also be able to see it if you ls in your current directory.

Answer 2

所以我最终通过删除并重新安装 Microsoft.AspNetCore.Mvc 解决了这个问题，然后我重建了项目。