NuGet软件包还原项目失败:无法找到软件包'Microsoft.Net.Compilers'的2.0.0版本 [英] NuGet Package restore failed for project PROJECT: Unable to find version 2.0.0 of package 'Microsoft.Net.Compilers'

问题描述

我使用Visual Studio 2015的GitHub扩展将项目克隆到新计算机上.我尝试还原软件包，但收到一条错误消息:

I used the GitHub extension of Visual Studio 2015 to clone my project onto a new computer. I try to restore packages and I get an error that says:

NuGet Package restore failed for project PROJECT: Unable to find version 2.0.0 of package 'Microsoft.Net.Compilers'

我已经研究了有关类似问题的其他一些问题，但是这些解决方案中没有一个对我有用.

I've looked into some other questions about similar issues, but none of those solutions have worked for me yet.

我尝试删除程序包文件夹，再次打开Visual Studio，然后重新构建.那没有解决.

I tried deleting the packages folder, opening up up Visual Studios again and then rebuilding. That didn't resolve it.

我尝试在程序包管理器控制台中手动安装Microsoft.Net.Compilers.

I tried manually installing Microsoft.Net.Compilers in Package Manager Console.

 PM> Install-Package Microsoft.Net.Compilers

我尝试从csproj文件中删除这段代码(这似乎对某些人有用):

I tried removing this bit of code from the csproj file (this seemed to work for some):

    <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
  <PropertyGroup>
    <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
  </PropertyGroup>
  <Error Condition="!Exists('$(SolutionDir)\.nuget\NuGet.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\.nuget\NuGet.targets'))" />
</Target>

我尝试使用重新安装所有软件包

I tried reinstalling all packages with

Update-Package –reinstall

到目前为止，我还没有解决这个问题的运气.任何帮助表示赞赏.

So far I haven't had any luck resolving the issue. Any help is appreciated.

I tried the response below and received this error:

Install-Package : Some NuGet packages are missing from the solution. The packages need to be restored in order to build the dependency graph. Restore the packages before performing any operations.
At line:1 char:16
+ Install-Package <<<<  -Id Microsoft.Net.Compilers -Version 1.3.2 -Source nuget.org
    + CategoryInfo          : InvalidOperation: (:) [Install-Package], InvalidOperationException
    + FullyQualifiedErrorId : NuGetMissingPackages,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand

它也提示我还原软件包.当我点击恢复时，我得到了和往常一样的错误.

It also prompted me to restore packages. When I hit restore, I got the same error as usual.

推荐答案

根据错误消息，您似乎正在寻找一个不再存在的版本，并且无法确定您选择了哪个Package Source.我觉得您正在寻找的版本2.0.0在nuget.org存储库中不可用.最新的是2.0.0-rc，它是预发行版本.

Based on your error message looks like you are looking for a version that no longer exists and cannot tell which Package source you have selected. I feel like you are looking for version 2.0.0 which is not available in nuget.org repository. The latest one is 2.0.0-rc and it is pre release candidate.

如果要获取最新版本，请尝试使用此命令

Please try this command if you want to get the latest version

Install-Package -Id Microsoft.Net.Compilers -Version 2.0.0-rc -Source nuget.org

如果您想要最新的稳定版本(1.3.2)，请尝试使用此命令

If you want the latest stable version (1.3.2), try this command

Install-Package -Id Microsoft.Net.Compilers -Version 1.3.2 -Source nuget.org

更新 如果仍然无法安装该软件包，则该软件包可能在packages.config，packages/文件夹和.csproj文件之间不同步

UPDATE If the package still cannot be installed, then that package may be out of sync between packages.config, packages/ folder and .csproj file

请按照以下步骤进行手动清理

Please follow these steps to perform manual cleanup

1. 关闭Visual Studio.
2. 在记事本或某些文本编辑器中打开.csproj，然后手动删除与Microsoft.Net.Compilers相关的所有条目
3. 在记事本或某些文本编辑器中打开packages.config，并删除Microsoft.Net.Compilers软件包的条目
4. 转到Windows资源管理器中的"packages/"文件夹，然后删除Microsoft.Net.Compilers文件夹
5. 现在启动Visual Studio并打开解决方案.
6. 现在尝试再次安装该软件包.

作为第2步的一部分，您可能需要从.csproj中删除的某些条目是这些

Some of the entries that you may have to remove from .csproj as part of step 2 are these

<Import Project="..\packages\Microsoft.Net.Compilers.1.3.2\build\Microsoft.Net.Compilers.props" Condition="Exists('..\packages\Microsoft.Net.Compilers.1.3.2\build\Microsoft.Net.Compilers.props')" />

<NuGetPackageImportStamp></NuGetPackageImportStamp>

<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
        <PropertyGroup>
          <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
        </PropertyGroup>
        <Error Condition="!Exists('..\packages\Microsoft.Net.Compilers.1.3.2\build\Microsoft.Net.Compilers.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Net.Compilers.1.3.2\build\Microsoft.Net.Compilers.props'))" />
</Target>

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