每个下拉列表抛出“对象引用未设置为对象的实例”，无论它们在哪个页面上
[英]Every single Drop Down List throws “Object reference not set to an instance of an object” no matter what page they are on
问题描述
Every drop down list that has the property "autopostback" set to true throws the "Object reference not set to an instance of an object" during run time. 
将属性“autopostback”设置为true的每个下拉列表都会在运行时抛出“对象引用未设置为对象的实例”。 No errors are thrown in debugging. 调试时不会抛出任何错误。 It doesn't seem to matter what page they are on or even if they are bound to a data source. 它们在哪个页面上或者即使它们绑定到数据源似乎也不重要。 Nothing in my configuration was changed that I know of since they started doing this. 自从他们开始这样做以来，我的配置中没有任何内容被更改。
The .net error is as follows: .net错误如下：
Server Error in '/Nominations' Application.
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Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.]
DevExpress.Web.ASPxMenu.Internal.MenuHorizontalSpacingControl.PrepareSpacingControl(WebControl control, MenuItem item, Boolean isSeparatorSpacing) +119
DevExpress.Web.ASPxMenu.Internal.MenuHorizontalSpacingControl.PrepareControlHierarchy() +80
DevExpress.Web.ASPxClasses.Internal.InternalTableCell.Render(HtmlTextWriter writer) +47
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
System.Web.UI.WebControls.WebControl.RenderContents(HtmlTextWriter writer) +10
System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +32
DevExpress.Web.ASPxClasses.Internal.InternalTableRow.Render(HtmlTextWriter writer) +58
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.WebControls.Table.RenderContents(HtmlTextWriter writer) +206
DevExpress.Web.ASPxClasses.Internal.InternalTable.RenderContents(HtmlTextWriter writer) +81
System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +32
DevExpress.Web.ASPxClasses.Internal.InternalTable.Render(HtmlTextWriter writer) +186
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
System.Web.UI.WebControls.WebControl.RenderContents(HtmlTextWriter writer) +10
DevExpress.Web.ASPxClasses.ASPxWebControlBase.RenderInternal(HtmlTextWriter writer) +73
DevExpress.Web.ASPxClasses.ASPxWebControlBase.Render(HtmlTextWriter writer) +67
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
System.Web.UI.WebControls.TableCell.RenderContents(HtmlTextWriter writer) +57
System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +32
DevExpress.Web.ASPxClasses.Internal.InternalTableCell.Render(HtmlTextWriter writer) +58
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
System.Web.UI.WebControls.WebControl.RenderContents(HtmlTextWriter writer) +10
System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +32
DevExpress.Web.ASPxClasses.Internal.InternalTableRow.Render(HtmlTextWriter writer) +58
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.WebControls.Table.RenderContents(HtmlTextWriter writer) +206
DevExpress.Web.ASPxClasses.Internal.InternalTable.RenderContents(HtmlTextWriter writer) +81
System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +32
DevExpress.Web.ASPxClasses.Internal.InternalTable.Render(HtmlTextWriter writer) +186
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
System.Web.UI.WebControls.WebControl.RenderContents(HtmlTextWriter writer) +10
DevExpress.Web.ASPxClasses.ASPxWebControlBase.RenderInternal(HtmlTextWriter writer) +73
DevExpress.Web.ASPxClasses.ASPxWebControlBase.Render(HtmlTextWriter writer) +67
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
System.Web.UI.WebControls.WebControl.RenderContents(HtmlTextWriter writer) +10
DevExpress.Web.ASPxClasses.ASPxWebControlBase.RenderInternal(HtmlTextWriter writer) +73
DevExpress.Web.ASPxClasses.ASPxWebControlBase.Render(HtmlTextWriter writer) +67
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
System.Web.UI.WebControls.WebControl.RenderContents(HtmlTextWriter writer) +10
DevExpress.Web.ASPxClasses.ASPxWebControlBase.RenderInternal(HtmlTextWriter writer) +73
DevExpress.Web.ASPxClasses.ASPxWebControl.RenderInternal(HtmlTextWriter writer) +205
DevExpress.Web.ASPxClasses.ASPxWebControlBase.Render(HtmlTextWriter writer) +67
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +163
System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +32
System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +51
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +40
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
System.Web.UI.Control.Render(HtmlTextWriter writer) +10
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
System.Web.UI.Page.Render(HtmlTextWriter writer) +29
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1266
--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:2.0.50727.4206; ASP.NET Version:2.0.50727.4209
Does anyone have any ideas? 有没有人有任何想法？
1 个解决方案
解决方案1
2 已采纳 2012-02-03 20:12:32
It's something about that DevExpress menu control, which I am guessing is on a master page, which is why it is happening on every page. 这是DevExpress菜单控件的一些东西，我猜它是在一个母版页上，这就是为什么它发生在每一页上。 As for why, I don't think it's related to the drop down control, only with the fact that it's posting back. 至于为什么，我不认为它与下拉控制有关，只是因为它回发了。
You'll want to look into where that control is getting it's data from to see if that's null or perhaps contact DevExpress to see if it's an issue with the control. 您将需要查看该控件从何处获取数据，以查看该数据是否为null或者可能与DevExpress联系以查看它是否是控件的问题。
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