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

[ArgumentOutOfRangeException: 绱㈠紩瓒呭嚭鑼冨洿銆傚繀椤讳负闈炶礋鍊煎苟灏忎簬闆嗗悎澶у皬銆
鍙傛暟鍚岤 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