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:\11code\11casignMinipro\M10008.CaSignMiniPro\Shared\Tools\ValidateCode.cs:line 49
   at M10008.CaSignMiniPro.Application.BasicApplication.CreateImgCode() in E:\11code\11casignMinipro\M10008.CaSignMiniPro\Application\BasicApplication.cs:line 89
   at M10008.CaSignMiniPro.Service.BasicService.ImgCode() in E:\11code\11casignMinipro\M10008.CaSignMiniPro\Service\BasicService.cs:line 221

net core publish 發佈命令的時候 

System.Drawing.common.dll生成有問題

 這個dll文件正常是600kb的,每次生成都會把這個小文件的dll打出來.

替換一下就行...去自己的包源找一下