问题描述
调查只发生在我们的构建服务器上的构建问题，我很惊讶地看到这个答案指出有$(ProjectDir) 和 $(MSBuildProjectDir)，前者有时不可用.
Investigating a build problem that only occurs on our build server, I was surprised to see this answer point out there is both a $(ProjectDir) and a $(MSBuildProjectDir), the former sometimes not available.
大体上有什么区别?如果可用，我是否应该始终使用 $(MSBuildXXX) 版本的属性?为什么首先要使用 $(ProjectDir)?
What is the difference in general? Should I always be using $(MSBuildXXX) versions of properties if available? Why use $(ProjectDir) in the first place?
与其他问答中的建议相反，我有时会看到 $(MSBuildProjectDir) = ''.
Contrary to advice in the other Q&A, I'm sometimes seeing $(MSBuildProjectDir) = ''.
推荐答案
正如您链接的答案所说 $(ProjectDir) 仅在导入 Microsoft.Common.Targets 后可用，而 $(MSBuildProjectDir) 是 MSBuild 本身的保留属性.
As your linked answer says $(ProjectDir) is only available after Microsoft.Common.Targets has been imported, while $(MSBuildProjectDir) is a reserved property in MSBuild itself.
因此，使用 $(MSBuildXXX) 属性将确保您始终可以使用它们，而无需导入所有必要的引用.
So using the $(MSBuildXXX) properties will ensure that they are always available to you without needing to import all the necessary references.
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