docker容器运行.net core3.0的坑一：无法执行image类（亲测原创技术分享）

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docker容器运行.net core3.0的坑一：无法执行image类

当.net core 3.0项目上用到image类时，会遇到如下问题

System.TypeInitializationException: The type initializer for 'Gdip' threw an exception.
 ---> System.DllNotFoundException: Unable to load shared library 'libgdiplus' or one of its dependencies. In order to help diagnose loading problems, consider setting the LD_DEBUG environment variable: liblibgdiplus: cannot open shared object file: No such file or directory
   at System.Drawing.SafeNativeMethods.Gdip.GdiplusStartup(IntPtr& token, StartupInput& input, StartupOutput& output)
   at System.Drawing.SafeNativeMethods.Gdip..cctor()
   --- End of inner exception stack trace ---
   at SmallWeb.Areas.OCR.Controllers.HomeController.Base64StrToImage(String base64Str) in C:Userssjnsource
eposSmallWebSmallWebAreasOCRControllersHomeController.cs:line 256
   at SmallWeb.Areas.OCR.Controllers.HomeController.upload() in C:Userssjnsource
eposSmallWebSmallWebAreasOCRControllersHomeController.cs:line 65

在容器里顺序执行命令

apt-get update
apt-get install libgdiplus