[NullReferenceException: 未将对象引用设置到对象的实例。]
NSP.Web.CChannelBook.<get_Navs>b__3(EtCategory catItem) +3
System.Linq.EnumerableSorter`2.ComputeKeys(TElement[] elements, Int32 count) +106
System.Linq.EnumerableSorter`1.Sort(TElement[] elements, Int32 count) +28
System.Linq.<GetEnumerator>d__1.MoveNext() +272
System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +452
System.Linq.Enumerable.ToList(IEnumerable`1 source) +72
NSP.Web.CChannelBook.get_Nav() +51
ASP.booklist_aspx.Page_Load(Object sender, EventArgs e) +643
System.Web.UI.Control.OnLoad(EventArgs e) +107
System.Web.UI.Control.LoadRecursive() +89
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1532
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