.Net DataGridView“索引0没有值”。 [英] .Net DataGridView "Index 0 does not have a value."

问题描述

我遇到了一个DataGridView问题。
尝试删除其中一个项目并重新加载网格时，我收集了3个绑定到网格的项目。

如果有代码

  If（dlg.ShowDialog（）= DialogResult.OK）然后
'显示对话框与网格
结束如果
  

在打开的对话框中，我从网格中删除一个项目（应该依次删除）从集合中的项目，并重新加载网格），并返回到If（dlg.show ...行，错误

System.Windows.Forms.dll中出现类型System.IndexOutOfRangeException的第一次机会异常

附加信息：索引2没有值。

（我已经打破了调试器设置通用语言运行时错误）

我可以理解这个错误，如果我是尝试访问任何单元格，行或列，但不是，然后我会期望异常停止在代码行，试图acc ess这个网格数据，而不是If（dlg.ShowDialog（）...行

任何想法？
Cheers

解决方案

我发现如果你添加了

  DataGridView.DataSource = Nothing 
 DataGridView.Refresh（）
  

$ b在将网格重置为集合（删除已删除的项目）之前$ b

  DataGridView.DataSource = MyCollection 
  

它的作用就像一个魅力。
仍然有兴趣了解为什么你必须这样做。

I am having trouble with a DataGridView. I have a collection of 3 Items bound to the grid, when trying to delete one of the items and reload the grid.

If have code of

If (dlg.ShowDialog() = DialogResult.OK) Then
     'Show dialog with grid on it
End If

On the opened dialog, I delete an item from the grid (which should in turn, delete the item from the collection, and re-load the grid), and it returns to the "If (dlg.show..." line, with the error of

"A first chance exception of type 'System.IndexOutOfRangeException' occurred in System.Windows.Forms.dll

Additional information: Index 2 does not have a value. "

(I have break into debugger set on for common language runtime errors)

I can understand this error if i were trying to access any cells, row or columns, but im not, and then I would expect the exception to stop on the line of code that is trying to access this grid data, not the "If (dlg.ShowDialog()... " line

Any ideas? Cheers

解决方案

I have discovered that if you add in

DataGridView.DataSource = Nothing
DataGridView.Refresh()

before resetting the grid to the collection (with the deleted item removed)

DataGridView.DataSource = MyCollection

It works like a charm. Still interested as to why you have to do this.

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