VS Code dotnet core C#中的错误:"无法找到类型或命名空间名称'System'",但构建成功

当尝试在C#DotNet Core MVC应用程序上使用Visual Studio Code时,我在使Visual Studio代码工作时遇到了很多麻烦.它无法找到与C#相关的任何内容,甚至标记为"使用系统"; 无效,说它找不到它.

但是,当我运行dotnet build时,它会成功,没有警告或错误,项目就会运行.

我的project.json:

 {
  "version": "1.0.0-*",
  "buildOptions": {
    "debugType": "portable",
    "emitEntryPoint": true
  },
  "dependencies": {
    "Microsoft.NETCore.App": {
      "version": "1.1.0",
      "type": "platform"
    },
    "Microsoft.EntityFrameworkCore.Sqlite": "1.1.0",
    "Microsoft.EntityFrameworkCore.Design": {
      "version": "1.1.0",
      "type": "build"
    },
    "Microsoft.AspNetCore.Mvc": "1.1.0",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.1.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.1.0",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.1.0",
    "Microsoft.Extensions.Configuration.FileExtensions": "1.1.0",
    "Microsoft.Extensions.Configuration.Json": "1.1.0",
    "Microsoft.Extensions.Logging": "1.1.0",
    "Microsoft.Extensions.Logging.Console": "1.1.0",
    "Microsoft.Extensions.Logging.Debug": "1.1.0",
    "Microsoft.Extensions.Options.ConfigurationExtensions": "1.1.0",
    "Microsoft.AspNetCore.StaticFiles": "1.1.0"
  },

  "frameworks": {
    "netcoreapp1.1": {
      "dependencies": {
        "Microsoft.NETCore.App": {
          "type": "platform",
          "version": "1.1.0"
        }
      },
      "imports": "dnxcore50"
    }
  }
}

有任何想法吗？我真的用这个把头发拉了出来.

有时,Visual Studio Code的C#(由OmniSharp提供支持)会变得混乱.

尝试重新启动OmniSharp.这有两种方式:

关闭并重新打开Visual Studio代码,或

打开Command Pallet并键入Restart Omnisharp.

如果我们从命令行而不是从Visual Studio Code中恢复依赖关系,OmniSharp往往会变得混乱.