“/”应用程序中的服务器错误。

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行 502:                            if (relprolist.Count == 0)
行 503:                            {
行 504:                                relprolist = current.product.getfixedproducts(current.nowproduct.catalog().code.Substring(0, 4), -1, 10, "0", 1).list;
行 505:                            }
行 506:                            foreach (var pro in relprolist)

[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) +12953527
   ASP.content_xtheme_yonghua_product_info_aspx.__RenderContent3(HtmlTextWriter __w, Control parameterContainer) in e:\websites\yonghuachem_com\wwwroot\content\xtheme\yonghua\product_info.aspx:504
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +270
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +14
   System.Web.UI.Control.Render(HtmlTextWriter writer) +12
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +67
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +101
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +27
   ASP.content_xtheme_yonghua_site_master.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in e:\websites\yonghuachem_com\wwwroot\content\xtheme\yonghua\Site.Master:55
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +270
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +14
   System.Web.UI.Control.Render(HtmlTextWriter writer) +12
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +67
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +101
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +27
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +129
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +14
   System.Web.UI.Page.Render(HtmlTextWriter writer) +30
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +67
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +101
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +27
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1342