VS2019正式上手，第1个问题创建不了工程，看起来非常类似之前VS2017更新
解决办法
https://github.com/Microsoft/msbuild/issues/4286
和上次的问题如出一辙
https://www.cnblogs.com/kileyi/p/10772269.html
gacutil /u "MSBuild, Version=15.1.0.0" gacutil /u "Microsoft.Build.Conversion.Core, Version=15.1.0.0" gacutil /u "Microsoft.Build, Version=15.1.0.0" gacutil /u "Microsoft.Build.Engine, Version=15.1.0.0" gacutil /u "Microsoft.Build.Tasks.Core, Version=15.1.0.0" gacutil /u "Microsoft.Build.Utilities.Core, Version=15.1.0.0" gacutil /u "Microsoft.Build.Framework, Version=15.1.0.0"
原文：https://www.cnblogs.com/kileyi/p/11029634.html