[英]How to check if a datagridview cell is empty through button click in vb.net?
在保存数据之前过滤或检查一个或多个datagridview单元格是否为null时,我需要帮助。 我尝试了几个代码,但始终存在错误。 下面是图片。
提前致谢。
For Each rw As DataGridViewRow In dataGridView1.Rows
For i As Integer = 0 To rw.Cells.Count - 1
If rw.Cells(i).Value Is Nothing OrElse rw.Cells(i).Value = DBNull.Value OrElse String.IsNullOrWhitespace(rw.Cells(i).Value.ToString()) Then
'empty
End If
Next
Next
你可以写一个这样的函数:
Public Function IsDataGridViewEmpty(ByRef dataGridView As DataGridView) As Boolean
Dim isEmpty As Boolean = True
For Each row As DataGridViewRow In dataGridView.Rows
For Each cell As DataGridViewCell In row.Cells
If Not String.IsNullOrEmpty(cell.Value) Then
If Not String.IsNullOrEmpty(Trim(cell.Value.ToString())) Then
isEmpty = False
Exit For
End If
End If
Next
Next
Return isEmpty
End Function
或者与Linq:
Public Function IsDataGridViewEmpty(ByRef dataGridView As DataGridView) As Boolean
Dim isEmpty As Boolean = True
For Each row As DataGridViewRow In From row1 As DataGridViewRow In dataGridView.Rows Where (From cell As DataGridViewCell In row1.Cells Where Not String.IsNullOrEmpty(cell.Value)).Any(Function(cell) Not String.IsNullOrEmpty(Trim(cell.Value.ToString())))
isEmpty = False
Next
Return isEmpty
End Function
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