问题
This error occurs on the Bamboo build server during a command that restores my solution's NuGet packages. I can bypass this error by disabling the package restore task; however, this is only a temporary fix. Is there any way I can check if the dependency exists while running the task? This error occurs before MSBUILD is running. I am using .NET 4.5
回答1:
The already has a dependency defined for error when installing a NuGet package is due to a bug in older versions of NuGet.
You should look at updating NuGet on the build server or run your own build step that uses a version of NuGet that you download or deploy separately.
回答2:
This issue is fixed if you use nuget version: 3.4.4+
https://dist.nuget.org/index.html
I would recommend using latest version
来源：https://stackoverflow.com/questions/36656552/portable-bouncycastle-already-has-a-dependency-defined-for-system-collections