更新时间:2023-11-29 19:55:16
您需要检查 值
属性 nofollow> DataGridViewCell
是 Nothing
(等效于 null
in C#)。
You need to check if the Value
property of the DataGridViewCell
is Nothing
(the equivalent of null
in C#).
您可以使用以下代码进行操作:
You can do that with the following code:
If myDataGridView.CurrentCell.Value Is Nothing Then
MessageBox.Show("Cell is empty")
Else
MessageBox.Show("Cell contains a value")
End If
如果您想通知用户何时尝试将保留为空的单元格保留为空白,您需要在 CellValidating
事件处理程序方法。例如:
If you want to inform the user when they try to leave the cell that it has been left empty, you need to use similar code in the CellValidating
event handler method. For example:
Private Sub myDataGridView_CellValidating(ByVal sender As Object,
ByVal e As DataGridViewCellValidatingEventArgs)
Handles myDataGridView.CellValidating
If myDataGridView.Item(e.ColumnIndex, e.RowIndex).Value Is Nothing Then
' Show the user a message
MessageBox.Show("You have left the cell empty")
' Fail validation (prevent them from leaving the cell)
e.Cancel = True
End If
End Sub