找不到指定的框架'Microsoft.AspNetCore.App'版本'2.1.0' [英] The specified framework 'Microsoft.AspNetCore.App', version '2.1.0' was not found

问题描述

我试图将我的Web应用程序从.net core 2.0升级到.net core 2.1 我做到了:

I tried to upgrade my web app from .net core 2.0 to .net core 2.1 I did:

1)安装Visual Studio Professional 2017预览版15.8.0预览版1.1
2)从此处安装.net core 2.1.3 RC1 SDK:

1) Install Visual Studio Professional 2017 Preview Version 15.8.0 Preview 1.1
2) Installed the .net core 2.1.3 RC1 SDK from here: https://www.microsoft.com/net/download/dotnet-core/sdk-2.1.300-rc1
3) Updated all of my aspnetcore nuget packages to the latest version.

完成这两项操作后，当我启动项目时，会显示以下屏幕:

After doing both of these things, when I start my project I get this screen:

HTTP错误502.5-进程失败此问题的常见原因:

HTTP Error 502.5 - Process Failure Common causes of this issue:

The application process failed to start
The application process started but then stopped
The application process started but failed to listen on the configured port 

故障排除步骤:

Check the system event log for error messages
Enable logging the application process' stdout messages
Attach a debugger to the application process and inspect 

有关更多信息，请访问: https://go.microsoft.com/fwlink/?LinkID=808681

For more information visit: https://go.microsoft.com/fwlink/?LinkID=808681

在ASP.NET Core Web Server的输出"窗口中，得到以下信息:

and in my Output window from ASP.NET Core Web Server, I get this:

The specified framework 'Microsoft.AspNetCore.App', version '2.1.0' was not found.
  - Check application dependencies and target a framework version installed at:
      C:\Program Files\dotnet\
  - Installing .NET Core prerequisites might help resolve this problem:
      http://go.microsoft.com/fwlink/?LinkID=798306&clcid=0x409
  - The .NET Core framework and SDK can be installed from:
      https://aka.ms/dotnet-download
  - The following versions are installed:
      2.1.0-preview2-final at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
      2.1.0-rc1-final at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
It was not possible to find any compatible framework version
The specified framework 'Microsoft.AspNetCore.App', version '2.1.0' was not found.
  - Check application dependencies and target a framework version installed at:
      C:\Program Files\dotnet\
  - Installing .NET Core prerequisites might help resolve this problem:
      http://go.microsoft.com/fwlink/?LinkID=798306&clcid=0x409
  - The .NET Core framework and SDK can be installed from:
      https://aka.ms/dotnet-download
  - The following versions are installed:
      2.1.0-preview2-final at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
      2.1.0-rc1-final at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]

推荐答案

.NET Core 2.1 SDK将于本周发布.如果您不能等到那时，请将其添加到您的* .csproj

.NET Core 2.1 SDK will be released this week. If you can't wait until then, add this to your *.csproj

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>netcoreapp2.1</TargetFramework>
    <RestoreAdditionalProjectSources>
        https://dotnetfeed.blob.core.windows.net/orchestrated-release-2-1/20180515-07/final/index.json
    </RestoreAdditionalProjectSources>
  </PropertyGroup>

  ....
</Project>

并从以下位置下载最终的SDK:

And download the final SDK from: https://dotnetcli.blob.core.windows.net/dotnet/Sdk/2.1.300/dotnet-sdk-2.1.300-win-x64.exe

有关更多详细信息，请访问: https://github.com/aspnet/Home/wiki/2.1.0-早期访问-下载

For more details visit: https://github.com/aspnet/Home/wiki/2.1.0-Early-Access-Downloads

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