没有引用任何.net 4.5的东西，也没有引用 Newtonsoft.dll，原因是引用了微软的tlb类型库，引用方法如 https://www.cnblogs.com/nanfei/p/10879800.html
解决办法：删除掉这个引用就好了，如果确实用到了其中的东西，那再找其它方案吧
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"Could not load type 'System.Runtime.CompilerServices.ExtensionAttribute' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b7
Could not load type 'System.Runtime.CompilerServices.ExtensionAttribute'
fiddler运行报错：Could not load type 'System.Runtime.CompilerServices.ExtensionAttribute'
Could not load type 'System.Reflection.AssemblySignatureKeyAttribute' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c
缺少编译器要求的成员“System.Runtime.CompilerServices.ExtensionAttribute..ctor” 解决方案
缺少编译器要求的成员“System.Runtime.CompilerServices.ExtensionAttribute..ctor” 解决方案
Could not load file or assembly 'System.ValueTuple'
System.Runtime.CompilerServices.Unsafe
TypeLoadException: Could not load type 'Microsoft.AspNetCore.Mvc.Internal.IHttpResponseStreamWriterFactory' from assembly 'Microsoft.AspNetCore.Mvc.Core, Version=2.1.2.0 ...
解决：Could not load type 'System.ServiceModel.Activation.HttpModule' from assemb