[ArgumentOutOfRangeException: 索引和长度必须引用该字符串内的位置。
参数名: length]
System.String.Substring(Int32 startIndex, Int32 length) +13148947
product.Page_Load(Object sender, EventArgs e) +634
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
System.Web.UI.Control.OnLoad(EventArgs e) +97
System.Web.UI.Control.LoadRecursive() +61
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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