[InvalidOperationException: 序列不包含任何匹配元素]
System.Linq.Enumerable.First(IEnumerable`1 source, Func`2 predicate) +276
products_list.Page_Load(Object sender, EventArgs e) in e:\WEB\HJ(新)\products_list.aspx.cs:31
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
System.Web.UI.Control.OnLoad(EventArgs e) +95
System.Web.UI.Control.LoadRecursive() +59
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678
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