net core System.Drawing is not supported on this platform.

System.Drawing is not supported on this platform.
System.PlatformNotSupportedException: System.Drawing is not supported on this platform.
   at System.Drawing.Bitmap..ctor(Int32 width, Int32 height)
   at M10008.CaSignMiniPro.Shared.ValidateCode.CreateValidateGraphic(String validateCode, Int32 fontSize, Int32 lineHeight) in E:11code11casignMiniproM10008.CaSignMiniProSharedToolsValidateCode.cs:line 49
   at M10008.CaSignMiniPro.Application.BasicApplication.CreateImgCode() in E:11code11casignMiniproM10008.CaSignMiniProApplicationBasicApplication.cs:line 89
   at M10008.CaSignMiniPro.Service.BasicService.ImgCode() in E:11code11casignMiniproM10008.CaSignMiniProServiceBasicService.cs:line 221

net core publish 发布命令的时候 

System.Drawing.common.dll生成有问题

 这个dll文件正常是600kb的,每次生成都会把这个小文件的dll打出来.

替换一下就行...去自己的包源找一下