[ArgumentOutOfRangeException: 长度不能小于 0。
参数名: length]
System.String.Substring(Int32 startIndex, Int32 length) +10756467
NewChineseWeb.pdfReader.web.pdfReader.Page_Load(Object sender, EventArgs e) +4225
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
System.Web.UI.Control.OnLoad(EventArgs e) +92
System.Web.UI.Control.LoadRecursive() +54
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772
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