我遇到了同样的问题，得到了同样的错误：
error : Package <package> was not found. It might have been deleted since NuGet restore. Otherwise, NuGet restore might have only partially completed, which might have been due to maximum path length restrictions. [<path>]
我能够使用MSBuild /t:restore代替来解决它dotnet restore。
请参阅：https : //docs.microsoft.com/zh-cn/nuget/reference/msbuild- targets#restore-target
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