mysql - 如何禁用或隐藏 DataGridView 中的按钮

Question

您好，我想隐藏或禁用第 3 列中的按钮，我打算在每次单击它时添加行。乱七八糟的是，以前的按钮是事件的，可以添加行。如何将按钮仅放在最后一行？

这是我的工作代码:

    Private Sub dgAppliances_CellContentClick(sender As Object, e As DataGridViewCellEventArgs) Handles dgAppliances.CellContentClick
    If e.ColumnIndex <> 2 Then
        Exit Sub
    Else
        If Me.dgAppliances.RowCount - 1 = 20 Then
            MsgBox("Maximum of 20 appliances only.")
        Else
            Me.dgAppliances.Rows.Add()
        End If
    End If
End Sub

但是当我添加一些代码时:

    Private Sub dgAppliances_CellContentClick(sender As Object, e As DataGridViewCellEventArgs) Handles dgAppliances.CellContentClick
    If e.ColumnIndex <> 2 Then
        Exit Sub
    Else
        If Me.dgAppliances.RowCount - 1 = 20 Then
            MsgBox("Maximum of 20 appliances only.")
        Else
            Me.dgAppliances.Rows.Add()
            Dim cell As DataGridViewButtonCell = dgAppliances.Rows(0).Cells(2)
            cell.Value = String.Empty
            cell = New DataGridViewColumn()
            cell.ReadOnly = True
        End If
    End If
End Sub

这行 cell = New DataGridViewColumn() 有错误。

它说，“System.Windows.Forms.DataGridViewColumn”无法转换为“System.Windows.Forms.DataGridViewButtonCell”。

谁能帮我解决这个问题？ TIA。

Here's the sample image.

Answer 1

您正在尝试将 DataGridViewColumn 分配给 DataGridViewButtonCell - 将整个列分配给单个单元格 .

也许您的意图是:cell = New DataGridViewTextBoxCell()？但即便如此，如果你想

place the button only in the last row

然后你会遇到Adding Different DataGridView Cell Types to a Column的问题.您可以如下所示进行转换:

Me.dataGridView1.ColumnCount = 3
Me.dataGridView1.AllowUserToAddRows = False
Me.dataGridView1.AllowUserToDeleteRows = False
Me.dataGridView1.RowCount = 1
Me.dataGridView1(2, 0) = New DataGridViewButtonCell()

Private Sub DataGridView1_CellContentClick(sender As Object, e As DataGridViewCellEventArgs) Handles dataGridView1.CellContentClick
    If TypeOf Me.dataGridView1(e.ColumnIndex, e.RowIndex) Is DataGridViewButtonCell Then
        If Me.dataGridView1.RowCount - 1 = 20 Then
            MessageBox.Show("Maximum of 20 appliances only.")
        Else
            Me.dataGridView1.Rows.Add()
            Me.dataGridView1(e.ColumnIndex, e.RowIndex) = New DataGridViewTextBoxCell()
            Me.dataGridView1(e.ColumnIndex, e.RowIndex).[ReadOnly] = True
            Me.dataGridView1(e.ColumnIndex, Me.dataGridView1.RowCount - 1) = New DataGridViewButtonCell()
        End If
    End If
End Sub