[InvalidOperationException: 序列不包含任何匹配元素]
System.Linq.Enumerable.Single(IEnumerable`1 source, Func`2 predicate) +488
LIB.WEB.special.item.PageInit() in F:\项目文件\2020\北京电子科技学院\SRC\LIB.WEB\special\item.aspx.cs:112
LIB.WEB.special.item.Page_Load(Object sender, EventArgs e) in F:\项目文件\2020\北京电子科技学院\SRC\LIB.WEB\special\item.aspx.cs:101
System.Web.UI.Control.OnLoad(EventArgs e) +108
System.Web.UI.Control.LoadRecursive() +90
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1607
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