“/”应用程序中的服务器错误。

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行 35:         if (currentindex != 0)
行 36:         {
行 37:             ntid = list[currentindex - 1].ClassId;
行 38:         }
行 39:         else

[ArgumentOutOfRangeException: 索引超出范围。必须为非负值并小于集合大小。
参数名: index]
   System.ThrowHelper.ThrowArgumentOutOfRangeException() +72
   System.Collections.Generic.List`1.get_Item(Int32 index) +34
   Index.Page_Load(Object sender, EventArgs e) in f:\usr\localuser\qxw1608450018\case.aspx.cs:37
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +92
   System.Web.UI.Control.LoadRecursive() +54
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772