Datagridviewrow返回不正确的单元格值

Question

我有一个简单的DataGridView，我试图在单击按钮时获取单元格的值。当它被设置为变量时它是不正确的但是当我快速观察它是正确的。我不知道造成这种情况的原因是什么？

 Private Sub btnUpdAll_Click(sender As Object, e As EventArgs) Handles btnUpdAll.Click
        For Each r As DataGridViewRow In gvResults.Rows
            Dim x = r.Cells(1).Value
        Next
    End Sub

Answer 1

为什么要循环，如果你想要一个单元格的值，你选择的单元格。

我会用：

Private Sub btnUpdAll_Click(sender As Object, e As EventArgs) Handles btnUpdAll.Click

   Dim row As DataGridViewRow = gvResults.CurrentRow

   Dim x as String= row.Cells(e.ColumnIndex).Value.toString()

End Sub

或

Private Sub btnUpdAll_Click(sender As Object, e As EventArgs) Handles btnUpdAll.Click

   Dim x As String = gvResults.Rows(e.RowIndex).Cells(e.ColumnIndex).Value.ToString()

End Sub

Answer 2

正如@jmcilhinney所说我错误地在循环中声明了变量并且每次都重置它。 @shimrod，我想获得每一行并更新每一行中的单个单元格，如下所示。

 Private Sub btnUpdAll_Click(sender As Object, e As EventArgs) Handles btnUpdAll.Click
        Dim x
        For Each r As DataGridViewRow In gvResults.Rows
            x = r.Cells(1).Value
            updateRecord(x)               
        Next
    End Sub