Question

我有一个（相当复杂的）应用程序，并且在某些罕见的情况下（特别是第一次按下某个按钮）功能

    public static bool ShowDialogOk(this Form form, IWin32Window owner = null) {
            return form.ShowDialog(owner) == DialogResult.OK;

抛出异常

{System.IndexOutOfRangeException: Index -1 does not have a value.
   at System.Windows.Forms.CurrencyManager.get_Item(Int32 index)
   at System.Windows.Forms.DataGridView.DataGridViewDataConnection.OnRowEnter(DataGridViewCellEventArgs e)
   at System.Windows.Forms.DataGridView.OnRowEnter(DataGridViewCell& dataGridViewCell, Int32 columnIndex, Int32 rowIndex, Boolean canCreateNewRow, Boolean validationFailureOccurred)
   at System.Windows.Forms.DataGridView.SetCurrentCellAddressCore(Int32 columnIndex, Int32 rowIndex, Boolean setAnchorCellAddress, Boolean validateCurrentCell, Boolean throughMouseClick)
   at System.Windows.Forms.DataGridView.OnCellMouseDown(HitTestInfo hti, Boolean isShiftDown, Boolean isControlDown)
   at System.Windows.Forms.DataGridView.OnCellMouseDown(DataGridViewCellMouseEventArgs e)
   at System.Windows.Forms.DataGridView.OnMouseDown(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseDown(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.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(IntPtr 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.Form.ShowDialog(IWin32Window owner)

现在这个函数在崩溃之前用相同的变量调用了很多次，这让我很难说出错了。有人知道form.ShowDialog函数中IndexOutOfRangeException的可能原因吗？这样我可以更好地调试这段代码。

编辑：我注意到只从一个地方调用ShowDialogOk，如果我在这一行放置一个断点，它只在创建GUI时传递，但实际上不是在错误触发时传递。

Answer 1

就在CurrencyManager属性的位置并进行大小检查。（它是表单类中的属性，它可能用于网格事件（行输入或输入））（假设它是一个属性，因为：CurrencyManager.get_Item（Int32 index））

var index = <somenumber>;
if(CurrencyManager.Length > 0 && index < CurrencyManager.Length) //also can be Count()
   CurrencyManager[index]
else
   // Do some logic when index is out of bounds.

form.ShowDialog（owner）抛出IndexOutOfRangeException可能导致？

1 个答案: