偶爾NullReferenceException

Question

用戶偶爾會遇到錯誤。我將我的應用程序從2003服務器32位2.0框架移至2012服務器（位於雲）64位4.0框架。任何幫助表示讚賞。

< Exception Type =" System.NullReferenceException"> 
<Message> Object reference not set to an instance of an object. </ Message > 
<Source> Syncfusion.Grid.Grouping.Web </ Source > 
<StackTrace> at Syncfusion.Web.UI.WebControls.Grid.Grouping.GridGroupingControl.LoadSourceListSet() at Syncfusion.Web.UI.WebControls.Grid.Grouping.GridGroupingControl.LoadViewState(Object savedState) at System.Web.UI.Control.LoadViewStateRecursive(Object savedState) at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) at System.Web.UI.Control.LoadViewStateRecursive(Object savedState) at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) at System.Web.UI.Control.LoadViewStateRecursive(Object savedState) at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) at System.Web.UI.Control.LoadViewStateRecursive(Object savedState) at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) at System.Web.UI.Control.LoadViewStateRecursive(Object savedState) at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) at System.Web.UI.Control.LoadViewStateRecursive(Object savedState) at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) at System.Web.UI.Control.LoadViewStateRecursive(Object savedState) at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) at System.Web.UI.Control.LoadViewStateRecursive(Object savedState) at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) at System.Web.UI.Control.LoadViewStateRecursive(Object savedState) at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) at System.Web.UI.Control.LoadViewStateRecursive(Object savedState) at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) at System.Web.UI.Control.LoadViewStateRecursive(Object savedState) at System.Web.UI.Page.LoadAllState() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) </ StackTrace > 
< Data /> 
</ Exception > 

Answer 1

我們在gridgroupingcontrol中將一些狀態從會話還原到ViewState。無論何時回收IIS，會話都會丟失，並導致更新後的問題。在Web中，會話不會過期，因爲我們會持續刷新會話，但如果您回收無法處理的IIS，則會話必須過期。

要解決此問題，請檢查會話是否已過期。如果是，您的頁面重定向到登錄頁面，重新登錄後，添加一個標誌參數到需要恢復的地址。在頁面加載中，嘗試獲取標誌參數。

我希望它對你有幫助。

如果解決方案無法幫助您，請與我分享有關它的更多信息或分享您的示例代碼。