have tried upgrading to the professional version of visual studio 2017 v 15.6.0 (Preview 7.0)have tried upgrading to the professional versio
阅读背景：
当前的.NET SDK不支持以.NET Core 2.1为目标。目标.NET Core 2.0或更低版本，或使用支持.NET Core 2.1的.NET SDK
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