已添加项。字典中的关键字:“1”所添加的关键字:“1”

[ArgumentException: 已添加项。字典中的关键字:“1”所添加的关键字:“1”] System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add) +10065554 download._301.GetHS() +574 download._301.Getlist(String str) +196 download._301.Page_Load(Object sender, EventArgs e) +6060 System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +42 System.Web.UI.Control.OnLoad(EventArgs e) +132 System.Web.UI.Control.LoadRecursive() +66 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2428