问题
I'm using some custom tasks from MSBuild Extension Pack (MEP). My projects are splitted among many files. In those files I import the MEP tasks using (twice or three times in two/three files). I receive the warning message when doing this like:
... warning MSB4011: "C:\Program Files\MSBuild\ExtensionPack\MSBuild.ExtensionPack.tasks" cannot be imported again. It was already imported at "D:...\Tasker.proj (5,3)". This is most likely a build authoring error. This subsequent import will be ignored.
Does anyone know how to get rid of this warning message? Please help!
回答1:
The work-around of this question would be: Calling the import with condition to check the existence of a unique property defined in the considering project file. Hope this helps!
回答2:
That warning has happened to me when I have built my application from VS IDE and by MSBuild tool in parallel. I guess the same might happen when you work with more than one VS window on the same project
回答3:
Delete the automatically generated file yourproject.nuget.props and the warning will go away.
来源：https://stackoverflow.com/questions/2544926/how-to-get-import-custom-tasks-more-than-once-without-warning-message