[ArgumentNullException: 值不能为 null。
参数名: url]
System.Web.HttpResponse.Redirect(String url, Boolean endResponse, Boolean permanent) +11740078
Document_DownloadFile.Download() +150
System.Web.UI.Control.OnLoad(EventArgs e) +108
System.Web.UI.Control.LoadRecursive() +90
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533
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