GDI+ 中发生一般性错误。

行 37:                 }
行 38:                 string savePath = string.Format("{0}/storebook.png", path);

行 40:                 baseList.Str = string.Format("{0}/storebook.png", str);
行 41:             #endregion

[ExternalException (0x80004005): GDI+ 中发生一般性错误。]
System.Drawing.Image.Save(String filename, ImageCodecInfo encoder, EncoderParameters encoderParams) +475786
System.Drawing.Image.Save(String filename, ImageFormat format) +69
System.Drawing.Image.Save(String filename) +25
Purple.WebWeChat.Controllers.QrCodeController.Storebook() in F:\lab-mf-storebook\Purple\Purple.WebWeChat\Controllers\QrCodeController.cs:39
lambda_method(Closure , ControllerBase , Object[] ) +62
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +14
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +205
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27
System.Web.Mvc.<>c__DisplayClassd.<InvokeActionMethodWithFilters>b__a() +56
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +256
System.Web.Mvc.<>c__DisplayClassf.<InvokeActionMethodWithFilters>b__c() +22
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +190
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +324
System.Web.Mvc.Controller.ExecuteCore() +105
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +42
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +10
System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__4() +31
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +19
System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +10
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +55
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +43
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9658236
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155