[ArgumentException: 参数无效。]
System.Drawing.Bitmap..ctor(String filename) +124
img.ThumImage(String srcPath, Int32 width, Int32 height) in e:\host\xinzhicn\web\ashx\img.ashx:75
img.ProcessRequest(HttpContext context) in e:\host\xinzhicn\web\ashx\img.ashx:26
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +406
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +76
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