Docker 运行 NET5 WebApi 出现 The type initializer for 'Gdip' threw an exception. 报错解决办法

如图，该webapi接口运行在Docker中，调用 /api/Verify/LoginVerifyCode接口时报错  The type initializer for 'Gdip' threw an exception.

后台看到是因为 libgdiplus这个类库找不到导致的！意思是在Docker容器里没有安装libgdiplus类库，只要安装上就可以了！

The type initializer for 'Gdip' threw an exception.
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 System.Drawing.SafeNativeMethods.Gdip.GdipCreateBitmapFromScan0(Int32 width, Int32 height, Int32 stride, Int32 format, IntPtr scan0, IntPtr& bitmap)
   at System.Drawing.Bitmap..ctor(Int32 width, Int32 height, PixelFormat format)
   at SkyebbBlogWebApi.Comm.Helper.VerifyCodeHelper.CreateImage(String code) in C:UsersSkyEebbDesktop新建文件夹skyebb-blog-webapiSkyebbBlogWebApi.CommHelperVerifyCodeHelper.cs:line 17
   at SkyebbBlogWebApi.Controllers.VerifyController.GetUserLoginVerifyCode() in C:UsersSkyEebbDesktop新建文件夹skyebb-blog-webapiSkyebbBlogWebApiControllersVerifyController.cs:line 70
   at lambda_method511(Closure , Object , Object[] )
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.SyncObjectResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeActionMethodAsync()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeNextActionFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextExceptionFilterAsync>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at System.Drawing.SafeNativeMethods.Gdip.GdipCreateBitmapFromScan0(Int32 width, Int32 height, Int32 stride, Int32 format, IntPtr scan0, IntPtr& bitmap)
   at System.Drawing.Bitmap..ctor(Int32 width, Int32 height, PixelFormat format)
   at SkyebbBlogWebApi.Comm.Helper.VerifyCodeHelper.CreateImage(String code) in C:UsersSkyEebbDesktop新建文件夹skyebb-blog-webapiSkyebbBlogWebApi.CommHelperVerifyCodeHelper.cs:line 17
   at SkyebbBlogWebApi.Controllers.VerifyController.GetUserLoginVerifyCode() in C:UsersSkyEebbDesktop新建文件夹skyebb-blog-webapiSkyebbBlogWebApiControllersVerifyController.cs:line 70
   at lambda_method511(Closure , Object , Object[] )
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.SyncObjectResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeActionMethodAsync()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeNextActionFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextExceptionFilterAsync>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)

接下来开始安装libgdiplus，执行【docker ps -a 】查看所有容器

【docker start 容器ID】 将容器运行起来

【docker exec -it e90f2b9d448d /bin/bash】进入该容器bash界面

 

执行【apt-get update】

【apt-get install -y libgdiplus】安装libgdiplus类库

 

【eixt】退出docker bash到宿主机的bash，执行 【docker restart 容器ID】，此时接口已经能正确访问了

上面的方法有个弊端，假如容器被误删，又要重新给容器安装libgdiplus库。

我们可以把修改好的容器制作成镜像，执行【docker commit e90f2b9d448d skyapi_libgdiplus】，然后执行【docker images】，

可以看到名字叫skyapi_libgdiplus的Docker镜像已经制作好了。今后只需要在 docker run -t 参数后面指定 skyapi_libgdiplus镜像即可。

当前还可以将镜像保存到docker hub，本地硬盘都可以。