我们如何循环 datagridview 中的列和行？答案

【问题标题】：how can we loop the column and row in the datagridview?我们如何循环 datagridview 中的列和行？
【发布时间】：2014-07-03 08:17:41
【问题描述】：

让我告诉你我们想要做什么，用户必须点击每个复选框，因为它代表学生出勤的数量，一旦用户点击按钮 1，它将显示出席的总天数和按钮2是每个学生的总缺勤。但是当我们运行我们的程序时，它只计算每列的数量。所以请帮助我们。 .谢谢！

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)  Handles Button1.Click
    If DataGridView1.RowCount > 1 Then
        Dim counter As Integer = 0
        Dim Counter1 As Integer = 0
        Dim Counter2 As Integer = 0
        Dim Counter3 As Integer = 0
        Dim Counter4 As Integer = 0
        Dim Counter5 As Integer = 0
        Dim Counter6 As Integer = 0
        Dim Counter7 As Integer = 0
        Dim Counter8 As Integer = 0
        Dim Counter9 As Integer = 0
        Dim Counter10 As Integer = 0




        For Each dr As DataGridViewRow In DataGridView1.Rows
            If dr.Cells("checkColumn").Value = True Then
                counter += 1

            End If
            If dr.Cells("checkCol1").Value = True Then
                Counter1 += 1
            End If
            If dr.Cells("checkCol2").Value = True Then
                Counter2 += 1
            End If
            If dr.Cells("checkCol3").Value = True Then
                Counter3 += 1
            End If
            If dr.Cells("checkCol4").Value = True Then
                Counter4 += 1
            End If
            If dr.Cells("checkCol5").Value = True Then
                Counter5 += 1
            End If
            If dr.Cells("checkCol6").Value = True Then
                Counter6 += 1
            End If
            If dr.Cells("checkCol7").Value = True Then
                Counter7 += 1
            End If
            If dr.Cells("checkCol8").Value = True Then
                Counter8 += 1
            End If
            If dr.Cells("checkCol9").Value = True Then
                Counter9 += 1
            End If
            If dr.Cells("checkCol10").Value = True Then
                Counter10 += 1
            End If





        Next
        DataGridView1.Rows(0).Cells("Present").Value = counter
        DataGridView1.Rows(1).Cells("Present").Value = Counter1
        DataGridView1.Rows(2).Cells("Present").Value = Counter2
        DataGridView1.Rows(3).Cells("Present").Value = Counter3
        DataGridView1.Rows(4).Cells("Present").Value = Counter4
        DataGridView1.Rows(5).Cells("Present").Value = Counter5
        DataGridView1.Rows(6).Cells("Present").Value = Counter6
        DataGridView1.Rows(7).Cells("Present").Value = Counter7
        DataGridView1.Rows(8).Cells("Present").Value = Counter8
        DataGridView1.Rows(9).Cells("Present").Value = Counter9


    End If
End Sub

【问题讨论】：

请附上您的代码。
哦！对不起，我只是新来的，所以我不熟悉使用这个网站。 .

标签： vb.net datagridviewcolumn

【解决方案1】：

这对你有用吗？

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    If DataGridView1.RowCount > 1 Then
        Dim columns As String() = { "checkColumn", "checkCol1", "checkCol2", "checkCol3", "checkCol4", "checkCol5", "checkCol6", "checkCol7", "checkCol8", "checkCol9", "checkCol10" }
        For i = 0 to columns.Length - 1
            DataGridView1.Rows(i).Cells("Present").Value = _
                DataGridView1.Rows _
                    .Cast(Of DataGridViewRow) _
                    .Select(Function (dr) dr.Cells(columns(i)).Value) _
                    .Where(Function (x) x) _
                    .Count()
        Next
    End If
End Sub

【讨论】：

感谢您回答我的问题，但您提供给我们的代码中有一些错误。 .
@Juri14 - 因为您的代码依赖于 UI，所以我无法正确测试它。你能告诉我错误是什么吗？
@Juri14 - 我刚刚启动了一个正在运行的测试并且代码有效。您需要提供更多详细信息。
嗯，这是错误：“Lambda 参数 'dr' 隐藏了封闭块中的变量、先前定义的范围变量或查询表达式中隐式声明的变量。”
你能告诉我这是什么意思吗？抱歉，我只是使用 vb.net 的新手，而且我只是一名学生，所以我不熟悉使用它。所以请帮助我们

【解决方案2】：

请尝试以下循环通过DataGridView：

Dim dgv As DataGridView = YourDataGridViewControl

For r As Integer = 0 To dgv.RowCount - 1
    Dim r As DataGridViewRow = dgv.Rows(r)
    For c As Integer = 0 To dgv.ColumnCount - 1
        Dim cellValue as string = dgv.Rows(r).Cells(c).Value
    Next
Next

【讨论】：