C# System.Threading.Tasks和System.Runtime中的任务冲突

我有一个asp.net内核的中间件，它工作得很好，但现在它给出了以下错误

类型“Task”存在于“System.Threading.Tasks，版本=4.0.10.0，区域性=中性，PublicKeyToken=b03f5f7f11d50a3a”和“System.Runtime，版本=4.2.0.0，区域性=中性，PublicKeyToken=b03f5f7f11d50a3a”ERP..NETCoreApp，版本=v1.1中

我也尝试了alias和absolute reference，但没有成功

这是Project.json

{
  "dependencies": {
    "AutoMapper": "5.2.0",
    "Microsoft.AspNetCore.Diagnostics": "1.1.0",
    "Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore": "1.1.0",
    "Microsoft.AspNetCore.Mvc": "1.1.0",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.1.0",
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.1.0-preview4-final",
    "Microsoft.AspNetCore.Server.Kestrel": "1.1.0",
    "Microsoft.AspNetCore.Session": "1.1.0",
    "Microsoft.AspNetCore.StaticFiles": "1.1.0",
    "Microsoft.EntityFrameworkCore.SqlServer": "1.1.0",
    "Microsoft.Extensions.Configuration.FileExtensions": "1.1.0",
    "Microsoft.Extensions.Configuration.Json": "1.1.0",
    "Microsoft.Extensions.Logging.Console": "1.1.0",
    "Microsoft.Extensions.Logging.Debug": "1.2.0-preview1-23015",
    "Microsoft.NETCore.App": {
      "version": "1.1",
      "type": "platform"
    }
  },

  "tools": {
  },

  "frameworks": {
    "netcoreapp1.1": {
      "imports": [
        "dotnet5.6",
        "portable-net45+win8"
      ]
    }
  },

  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },

  "runtimeOptions": {
    "configProperties": {
      "System.GC.Server": true
    }
  },

  "publishOptions": {
    "include": [
      "Areas/**/*.cshtml",
      "wwwroot",
      "web.config"
    ]
  },

  "scripts": {
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  },
  "userSecretsId": "aspnet-ERP-20161109085850"
}

---

我能够通过

Debug

包版本解决此更改

"Microsoft.Extensions.Logging.Debug": "1.2.0-preview1-23015",

到

并对调用方法签名进行更改

public Task Invoke(HttpContext httpContext)

到

---

请复制您的方法代码。由于popupost your project.json中的信息，我无法看到它，您在某处打乱了引用。我怀疑您已经将框架部分中的完整.NET Framework程序集添加到了.NET核心应用程序/.NET标准库中，或者您的依赖项之一does@Tseng添加了project.json。无需添加

async

，除非在方法中使用

wait

。，在这个方法中，只需要创建一个我一直在等待的异步StateMachine。

public Task Invoke(HttpContext httpContext)

public async Task Invoke(HttpContext httpContext)