单击列标题时出现System.NullReferenceException

本文介绍了单击列标题时出现System.NullReferenceException的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我的表单上有一个datagridview。

I have a datagridview on my form.

datagridview将AutoResizeColumn设置为Fill，一切正常。

the datagridview had the AutoResizeColumn set to Fill and everything worked fine.

我现在将其更改为All，当我点击colum标题时，我得到System.NullReferenceException。

I now changed it to All and when I click on the colum header a few time I get System.NullReferenceException.

我点击了一行时发生了一个事件，我知道那里没有发生异常。

I have one event that occurs when a row is clicked and I know the exception is not happening in there.

下面是错误的描述（很遗憾，它太长了）。任何意见，将不胜感激。

Below is a description of the error (sorry that it is so long).  Any advice would be appreciated.

无论如何，我是否可以捕获此错误并阻止它终止我的应用程序？

Is there anyway that I could just catch this error and prevent it from terminating my application?

System.NullReferenceException未处理 Message ="对象引用未设置为对象的实例。" Source =" System.Windows.Forms" StackTrace： System.Windows.Forms.DataGridView.ComputeVisibleColumns（） at System.Windows.Forms.DataGridView.LayoutScrollBars（） at System .Windows.Forms.DataGridView.ComputeLayout（） at System.Windows.Forms.DataGridView.PerformLayoutPrivate（Boolean useRowShortcut，Boolean computeVisibleRows，Boolean invalidInAdjustFillingColumns，Boolean repositionEditingControl） at System.Windows.Forms.DataGridView.OnColumnWidthChanged（ DataGridViewColumnEventArgs e） System.Windows.Forms.DataGridView.OnBandThicknessChanged（DataGridViewBand dataGridViewBand） System.Windows.Forms.DataGridView.AutoResizeColumnInternal（Int32 columnIndex，DataGridViewAutoSizeColumnCriteriaInternal autoSizeCol umnCriteriaInternal，Boolean fixedHeight）在System.Windows上的System.Windows.Forms.DataGridView.AutoResizeAllVisibleColumnsInternal（DataGridViewAutoSizeColumnCriteriaInternal autoSizeColumnCriteriaFilter，Boolean fixedHeight） System.Windows.Forms.DataGridView.OnAddedRow_PostNotification（Int32 rowIndex） Forms.DataGridViewRowCollection.OnCollectionChanged_PostNotification（CollectionChangeAction cca，Int32 rowIndex，Int32 rowCount，DataGridViewRow dataGridViewRow，Boolean changeIsDeletion，Boolean changeIsInsertion，Boolean recreateNewRow，Point newCurrentCell） at System.Windows.Forms.DataGridViewRowCollection.OnCollectionChanged（CollectionChangeEventArgs e，Int32 rowIndex， Int32 rowCount） System.Windows.Fo上的System.Windows.Forms.DataGridViewRowCollection.AddInternal（DataGridViewRow dataGridViewRow） System.Windows.Fo的System.Windows.Forms.DataGridView.RefreshRows（Boolean scrollIntoView）在System.Windows.Forms.CurrencyManager.OnListChanged（ListChangedEventArgs e）的System.Windows.Forms.DataGridView.DataGridViewDataConnection.currencyManager_ListChanged（Object sender，ListChangedEventArgs e）中的rms.DataGridView.DataGridViewDataConnection.ProcessListChanged（ListChangedEventArgs e） System.Windows.Forms.CurrencyManager.List_ListChanged（Object sender，ListChangedEventArgs e） System.Data.DataView.UnListChanged（ListChangedEventArgs e） System.Data.DataView.UpdateIndex（Boolean force，布尔fireEvent）在System.Data.Data.Data.SupIndex2上的System.Data.DataView.UpdateIndex（布尔强制） System.Data上的System.Data.DataView.SetIndex2（String newSort，DataViewRowState newRowStates，DataExpression newRowFilter，Boolean fireEvent）。 System.Data.DataView.set_Sort（String val）中的DataView.SetIndex（String newSort，DataViewRowState newRowStates，DataExpression newRowFilter） ue）在System.Data.DataView.System.ComponentModel.IBindingList.ApplySort（PropertyDescriptor属性，ListSortDirection方向） System.Windows.Forms.DataGridView.DataGridViewDataConnection.Sort（DataGridViewColumn dataGridViewColumn，ListSortDirection direction）在System.Windows.Fors上的System.Windows.Forms.DataGridView.SortInternal（IComparer比较器，DataGridViewColumn dataGridViewColumn，ListSortDirection方向） System.Windows.Forms上的System.Windows.Forms.DataGridView.Sort（DataGridViewColumn dataGridViewColumn，ListSortDirection方向） System.WindView.OnColumnHeaderMouseClick（DataGridViewCellMouseEventArgs e） System.Windows.Fornd.DataMridView.OnMouseClick（MouseEventArgs e） System.Windows.Forms.Control.WmMouseUp（Message& m，MouseButtons按钮，Int32单击）在System.Windows.Forms.Control.WndProc（Message& m） System.Windows.Forms.DataGridView.WndProc（Message& m）在System。 Windows.Forms.Control.ControlNativeWindow.OnMessage（Message& m） System.Windows.Forms.Control.ControlNativeWindow.WndProc（Message& m） System.Windows.Forms.NativeWindow.DebuggableCallback（IntPtr hWnd在System.Windows.Forns.Forms.Forms.Forms.UnsafeNativeMethods的System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW（MSG& msg）中，Int32 msg，IntPtr wparam，IntPtr lparam）。在System.Windows.Forms.Application.ThreadContext.RunMessageLoop的System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner（Int32 reason，ApplicationContext context）中的IMsoComponentManager.FPushMessageLoop（Int32 dwComponentID，Int32 reason，Int32 pvLoopData） （ Int32原因，ApplicationContext上下文）在System.Windows.Forms.Application.Run（Form mainForm）中的GuardianConfig.Program.Main（）在C：\ vsswork \ Guardard \ GuardianConfig \ GuardianConfig \\ GuardardConfig \Program.cs：第18行 System.AppDomain.nExecuteAssembly（程序集，String [] args） System.AppDomain.ExecuteAssembly（String assemblyFile，Evidence assemblySecurity，String [] args）<在System.Threading.Thread上的Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly（） 在System.Threading.ThreadHelper.ThreadStart（）

System.NullReferenceException was unhandled  Message="Object reference not set to an instance of an object."  Source="System.Windows.Forms"  StackTrace:       at System.Windows.Forms.DataGridView.ComputeVisibleColumns()       at System.Windows.Forms.DataGridView.LayoutScrollBars()       at System.Windows.Forms.DataGridView.ComputeLayout()       at System.Windows.Forms.DataGridView.PerformLayoutPrivate(Boolean useRowShortcut, Boolean computeVisibleRows, Boolean invalidInAdjustFillingColumns, Boolean repositionEditingControl)       at System.Windows.Forms.DataGridView.OnColumnWidthChanged(DataGridViewColumnEventArgs e)       at System.Windows.Forms.DataGridView.OnBandThicknessChanged(DataGridViewBand dataGridViewBand)       at System.Windows.Forms.DataGridView.AutoResizeColumnInternal(Int32 columnIndex, DataGridViewAutoSizeColumnCriteriaInternal autoSizeColumnCriteriaInternal, Boolean fixedHeight)       at System.Windows.Forms.DataGridView.AutoResizeAllVisibleColumnsInternal(DataGridViewAutoSizeColumnCriteriaInternal autoSizeColumnCriteriaFilter, Boolean fixedHeight)       at System.Windows.Forms.DataGridView.OnAddedRow_PostNotification(Int32 rowIndex)       at System.Windows.Forms.DataGridViewRowCollection.OnCollectionChanged_PostNotification(CollectionChangeAction cca, Int32 rowIndex, Int32 rowCount, DataGridViewRow dataGridViewRow, Boolean changeIsDeletion, Boolean changeIsInsertion, Boolean recreateNewRow, Point newCurrentCell)       at System.Windows.Forms.DataGridViewRowCollection.OnCollectionChanged(CollectionChangeEventArgs e, Int32 rowIndex, Int32 rowCount)       at System.Windows.Forms.DataGridViewRowCollection.AddInternal(DataGridViewRow dataGridViewRow)       at System.Windows.Forms.DataGridView.RefreshRows(Boolean scrollIntoView)       at System.Windows.Forms.DataGridView.DataGridViewDataConnection.ProcessListChanged(ListChangedEventArgs e)       at System.Windows.Forms.DataGridView.DataGridViewDataConnection.currencyManager_ListChanged(Object sender, ListChangedEventArgs e)       at System.Windows.Forms.CurrencyManager.OnListChanged(ListChangedEventArgs e)       at System.Windows.Forms.CurrencyManager.List_ListChanged(Object sender, ListChangedEventArgs e)       at System.Data.DataView.OnListChanged(ListChangedEventArgs e)       at System.Data.DataView.UpdateIndex(Boolean force, Boolean fireEvent)       at System.Data.DataView.UpdateIndex(Boolean force)       at System.Data.DataView.SetIndex2(String newSort, DataViewRowState newRowStates, DataExpression newRowFilter, Boolean fireEvent)       at System.Data.DataView.SetIndex(String newSort, DataViewRowState newRowStates, DataExpression newRowFilter)       at System.Data.DataView.set_Sort(String value)       at System.Data.DataView.System.ComponentModel.IBindingList.ApplySort(PropertyDescriptor property, ListSortDirection direction)       at System.Windows.Forms.DataGridView.DataGridViewDataConnection.Sort(DataGridViewColumn dataGridViewColumn, ListSortDirection direction)       at System.Windows.Forms.DataGridView.SortInternal(IComparer comparer, DataGridViewColumn dataGridViewColumn, ListSortDirection direction)       at System.Windows.Forms.DataGridView.Sort(DataGridViewColumn dataGridViewColumn, ListSortDirection direction)       at System.Windows.Forms.DataGridView.OnColumnHeaderMouseClick(DataGridViewCellMouseEventArgs e)       at System.Windows.Forms.DataGridView.OnMouseClick(MouseEventArgs e)       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)       at System.Windows.Forms.Control.WndProc(Message& m)       at System.Windows.Forms.DataGridView.WndProc(Message& m)       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)       at System.Windows.Forms.Application.Run(Form mainForm)       at GuardianConfig.Program.Main() in C:\vsswork\Guardian\GuardianConfig\GuardianConfig\GuardianConfig\Program.cs:line 18       at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)       at System.Threading.ThreadHelper.ThreadStart()

推荐答案

我遇到了完全相同的问题。在我的场景中，AutoSizeColumnsMode设置为'DisplayedCell'。当我单击列标题时，我得到一个NullReferenceException。堆栈跟踪如下所示。

I have experienced exactly the same problem. In my scenario, the AutoSizeColumnsMode is set to 'DisplayedCell'. When I click on a column header, I get a NullReferenceException. Stack trace is shown below.

这是DataGridView控件中的错误吗？有没有人知道一个解决方法？

Is this a bug in the DataGridView control? Does anyone know a workaround?

在System.Windows.Forms.DataGridView.ComputeVisibleColumns（） at System.Windows.Forms.DataGridView.LayoutScrollBars（） at System.Windows.Forms.DataGridView.ComputeLayout（） at System.Windows.Forms.DataGridView.PerformLayoutPrivate（Boolean useRowShortcut，Boolean computeVisibleRows，Boolean invalidInAdjustFillingColumns，Boolean repositionEditingControl） System.Windows.Forms.DataGridView.OnColumnWidthChanged（DataGridViewColumnEventArgs e） System.Windows.Forms.DataGridView.OnBandThicknessChanged（DataGridViewBand dataGridViewBand） System.Windows.Forms.DataGridView.AutoResizeColumnInternal（ Int32 columnIndex，DataGridViewAutoSizeColumnCriteriaInternal autoSizeColumnCriteriaInternal，Boolean fixedHeight） at System.Windows.Forms.DataGridView.AutoResizeAllVisibleColumnsInternal（DataGridViewAutoSizeColumnCriteriaInternal autoSizeColumnCriteriaFilter， System.Windows.Forms.DataGridView.OnAddedRow_PostNotification（Int32 rowIndex） System.Windows.Forms.DataGridViewRowCollection.OnCollectionChanged_PostNotification（CollectionChangeAction cca，Int32 rowIndex，Int32 rowCount，DataGridViewRow dataGridViewRow，Boolean changeIsDeletion，Boolean changeIsInsertion，Boolean recreateNewRow，Point newCurrentCell） at System.Windows.Forms.DataGridViewRowCollection.OnCollectionChanged（CollectionChangeEventArgs e，Int32 rowIndex，int32 rowCount） at System.Windows.Forms.DataGridViewRowCollection.AddInternal（DataGridViewRow dataGridViewRow） at System.Windows.Forms.DataGridView.RefreshRows（Boolean scrollIntoView） System.Windows.Forms.DataGridView.DataGridViewDataConnection.ProcessListChanged（ListChangedEventArgs e） at System.Windows.Forms.DataGridView.DataGridViewDataConnection.currencyManager_ListChanged（ System.Windows中的Object sender，ListChangedEventArgs e） .Forms.CurrencyManager.OnListChanged（ListChangedEventArgs e） System.Windows.Forms.CurrencyManager.List_ListChanged（Object sender，ListChangedEventArgs e） System.Windows.Forms.BindingSource.OnListChanged（ListChangedEventArgs e）在System.Windows.Forms.BindingSource.InnerList_ListChanged（Object sender，ListChangedEventArgs e） System.Data.DataView.OnListChanged（ListChangedEventArgs e） System.Data.DataView.UpdateIndex（Boolean force，Boolean fireEvent） System.Data.Data.Data.S.Index2中的System.Data.DataView.UpdateIndex（布尔强制） System.Data.DataView.SetIndex中的System.Data.DataView.SetIndex2（String newSort，DataViewRowState newRowStates，DataExpression newRowFilter，Boolean fireEvent） （String newSort，DataViewRowState newRowStates，DataExpression newRowFilter） at System.Data.DataView.set_Sort（String value） at System.Data.DataView.System.ComponentModel.IBindingList.ApplySort（PropertyDescriptor property，ListSortDirection dire ction）在System.Windows.Forms.BindingSource.ApplySort（PropertyDescriptor属性，ListSortDirection sort） System.Windows.Forms.DataGridView.DataGridViewDataConnection.Sort（DataGridViewColumn dataGridViewColumn，ListSortDirection direction）在System。 Windows.Forms.DataGridView.SortInternal（IComparer比较器，DataGridViewColumn dataGridViewColumn，ListSortDirection方向） System.Windows.Forms.DataGridView.Sort（DataGridViewColumn dataGridViewColumn，ListSortDirection方向） System.Windows.Forms.DataGridView.OnColumnHeaderMouseClick System.Windows.Forms.Control.WmMouseUp上的System.Windows.Forms.DataGridView.OnMouseClick（MouseEventArgs e）的（DataGridViewCellMouseEventArgs e）（消息& m，MouseButtons按钮，Int32单击）在System.Windows.Forms.Control.WndProc（Message& m） System.Windows.Forms.DataGridView.WndProc（Message& m）在System。 Windows.Forms.Control.ControlNativeWindow.OnMessage（Message& m） System.Windows.Forms.Control.ControlNativeWindow.WndProc（Message& m） System.Windows.Forms.NativeWindow.DebuggableCallback（IntPtr hWnd在System.Windows.Forns.Forms.Forms.Forms.UnsafeNativeMethods的System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW（MSG& msg）中，Int32 msg，IntPtr wparam，IntPtr lparam）。在System.Windows.Forms.Application.ThreadContext.RunMessageLoop的System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner（Int32 reason，ApplicationContext context）中的IMsoComponentManager.FPushMessageLoop（Int32 dwComponentID，Int32 reason，Int32 pvLoopData） （Int32原因，ApplicationContext上下文）在System.Windows.Form s.Application.Run（Form mainForm）

   at System.Windows.Forms.DataGridView.ComputeVisibleColumns()   at System.Windows.Forms.DataGridView.LayoutScrollBars()   at System.Windows.Forms.DataGridView.ComputeLayout()   at System.Windows.Forms.DataGridView.PerformLayoutPrivate(Boolean useRowShortcut, Boolean computeVisibleRows, Boolean invalidInAdjustFillingColumns, Boolean repositionEditingControl)   at System.Windows.Forms.DataGridView.OnColumnWidthChanged(DataGridViewColumnEventArgs e)   at System.Windows.Forms.DataGridView.OnBandThicknessChanged(DataGridViewBand dataGridViewBand)   at System.Windows.Forms.DataGridView.AutoResizeColumnInternal(Int32 columnIndex, DataGridViewAutoSizeColumnCriteriaInternal autoSizeColumnCriteriaInternal, Boolean fixedHeight)   at System.Windows.Forms.DataGridView.AutoResizeAllVisibleColumnsInternal(DataGridViewAutoSizeColumnCriteriaInternal autoSizeColumnCriteriaFilter, Boolean fixedHeight)   at System.Windows.Forms.DataGridView.OnAddedRow_PostNotification(Int32 rowIndex)   at System.Windows.Forms.DataGridViewRowCollection.OnCollectionChanged_PostNotification(CollectionChangeAction cca, Int32 rowIndex, Int32 rowCount, DataGridViewRow dataGridViewRow, Boolean changeIsDeletion, Boolean changeIsInsertion, Boolean recreateNewRow, Point newCurrentCell)   at System.Windows.Forms.DataGridViewRowCollection.OnCollectionChanged(CollectionChangeEventArgs e, Int32 rowIndex, Int32 rowCount)   at System.Windows.Forms.DataGridViewRowCollection.AddInternal(DataGridViewRow dataGridViewRow)   at System.Windows.Forms.DataGridView.RefreshRows(Boolean scrollIntoView)   at System.Windows.Forms.DataGridView.DataGridViewDataConnection.ProcessListChanged(ListChangedEventArgs e)   at System.Windows.Forms.DataGridView.DataGridViewDataConnection.currencyManager_ListChanged(Object sender, ListChangedEventArgs e)   at System.Windows.Forms.CurrencyManager.OnListChanged(ListChangedEventArgs e)   at System.Windows.Forms.CurrencyManager.List_ListChanged(Object sender, ListChangedEventArgs e)   at System.Windows.Forms.BindingSource.OnListChanged(ListChangedEventArgs e)   at System.Windows.Forms.BindingSource.InnerList_ListChanged(Object sender, ListChangedEventArgs e)   at System.Data.DataView.OnListChanged(ListChangedEventArgs e)   at System.Data.DataView.UpdateIndex(Boolean force, Boolean fireEvent)   at System.Data.DataView.UpdateIndex(Boolean force)   at System.Data.DataView.SetIndex2(String newSort, DataViewRowState newRowStates, DataExpression newRowFilter, Boolean fireEvent)   at System.Data.DataView.SetIndex(String newSort, DataViewRowState newRowStates, DataExpression newRowFilter)   at System.Data.DataView.set_Sort(String value)   at System.Data.DataView.System.ComponentModel.IBindingList.ApplySort(PropertyDescriptor property, ListSortDirection direction)   at System.Windows.Forms.BindingSource.ApplySort(PropertyDescriptor property, ListSortDirection sort)   at System.Windows.Forms.DataGridView.DataGridViewDataConnection.Sort(DataGridViewColumn dataGridViewColumn, ListSortDirection direction)   at System.Windows.Forms.DataGridView.SortInternal(IComparer comparer, DataGridViewColumn dataGridViewColumn, ListSortDirection direction)   at System.Windows.Forms.DataGridView.Sort(DataGridViewColumn dataGridViewColumn, ListSortDirection direction)   at System.Windows.Forms.DataGridView.OnColumnHeaderMouseClick(DataGridViewCellMouseEventArgs e)   at System.Windows.Forms.DataGridView.OnMouseClick(MouseEventArgs e)   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)   at System.Windows.Forms.Control.WndProc(Message& m)   at System.Windows.Forms.DataGridView.WndProc(Message& m)   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)   at System.Windows.Forms.Application.Run(Form mainForm)