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我在 c# 7 版本中阅读了本地函数定义，我想在 Visual Studio Express 2013 中使用。我该如何启用它。请帮帮我。预先感谢。
您应该升级到 Visual Studio 2017。自 Visual Studio 2002 (C# 1.0) 以来，我一直在移植相同的代码，而且编译失败的情况非常罕见！