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找不到指定的框架“microsoft.aspnetcore.app”,版本“2.1.0”

asp.net-core-2.0 .net-core asp.net-core

Kyle · 技术社区 · 6 年前

我尝试将我的Web应用程序从.NET核心2.0升级到.NET核心2.1 我做到了:

1)安装Visual Studio Professional 2017预览版15.8.0预览版1.1
2)在此安装.NET Core 2.1.3 RC1 SDK: https://www.microsoft.com/net/download/dotnet-core/sdk-2.1.300-rc1
3)将我的所有AspNetCore Nuget包更新为最新版本。

在做了这两件事之后,当我开始我的项目时,我会看到这个屏幕:

HTTP错误502.5-进程失败此问题的常见原因:

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

有关详细信息,请访问: https://go.microsoft.com/fwlink/?LinkID=808681

在我的ASP.NET核心Web服务器输出窗口中,我得到了:

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]

4 回复 | 直到 6 年前

Fouad Messaia 6 年前

.NET Core 2.1 SDK将于本周发布。如果您不能等到那时,请将此添加到您的*.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: https://dotnetcli.blob.core.windows.net/dotnet/Sdk/2.1.300/dotnet-sdk-2.1.300-win-x64.exe

有关详细信息,请访问: https://github.com/aspnet/Home/wiki/2.1.0-Early-Access-Downloads

Martin Ullrich 6 年前

通过更新所有的nuget包,您似乎已经从最初使用的rc版本(安装在您的系统上)升级到当前发布的rtm版本(因此在nuget上已经可用,但在您的系统上没有安装)。

这个 Microsoft.AspNetCore.App nuget包应该在没有版本的情况下被引用,以便安装的工具可以选择适当的版本。

更新.csproj文件以删除 Version 属性,仅通过以下方式引用该包:

<ItemGroup>
  <PackageReference Include="Microsoft.AspNetCore.App" />
</ItemGroup>

satellite satellite 6 年前

.NET Core sdk 2.1.300现在可用: https://www.microsoft.com/net/download/windows 安装它,这为我解决了问题。

GeekyMonkey 6 年前

看起来现在巧克力有售 https://chocolatey.org/packages/dotnetcore-sdk/2.1.300

在正常的dotnet分发站点上还没有。疯子。