Vb.net WinForm应用程序的DataGridView中的组合框

在

DataGridView

中使用

ComboBox

：

实施：

DataGridView

与datatable绑定，当使用鼠标单击任何行时，该行单元格元素将转换为

ComboBox

，现在用户可以选择

ComboBox

元素

问题：

它在所有情况下都能正常工作，

dgvTables（e.ColumnIndex，e.RowIndex）=l_CMBCTableList

但当

e.ColumnIndex

和

e.RowIndex

具有相同的值时，问题就出现了，当时

ComboBox

列表项看起来很不稳定，用户无法选择此

ComboBox

项 第一次

代码：

一,

二,

三,

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您需要编辑DataGridView模板，并为组合框提供一个标签，您可以在代码中引用该标签。单击时，您的组合框是否正在刷新页面？感谢您的回复，但问题是，当我选择datagridview的单元格时，我只是在dgvTables（e.ColumnIndex，e.RowIndex）=l_CMBCTableList中添加DataGridViewComboxCell对象，现在选择下拉值时出现了问题。第一次无法从下拉列表中选择项目。列表获得跳转。

Private Sub dgvTables_CellClick(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles dgvTables.CellClick

If e.ColumnIndex > -1 Then
  If dgvTables.Columns(e.ColumnIndex).Name.Contains("TableCaption") Then
   dgvTables(e.ColumnIndex, e.RowIndex) = l_cmbTableList ' Problem is coming at that point,       dropdown list is jumpy, user not able to select item .
   l_cmbTableList.DisplayMember = CONST_TableCaption
   l_cmbTableList.ValueMember = CONST_TableCaption
   l_cmbTableList.DataSource = dt
   l_cmbTableList.DisplayStyle = DataGridViewComboBoxDisplayStyle.Nothing

End If

Private Sub dgvTables_EditingControlShowing(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles dgvTables.EditingControlShowing
'Set the value of the object
  cmbEditingComobTables = CType(e.Control, ComboBox)
  If Not cmbEditingComobTables Is Nothing Then
  AddHandler cmbEditingComobTables.SelectedIndexChanged, AddressOf       editingCombo_SelectedIndexChanged
  cmbEditingComobTables.DrawMode = DrawMode.OwnerDrawFixed
  AddHandler cmbEditingComobTables.DrawItem, AddressOf cmb_DrawItem ' This attached event  will fire and set the color of combo box item
End If

Private Sub cmb_DrawItem(ByVal sender As System.Object, ByVal e As DrawItemEventArgs)
  If Not e.Index = -1 Then
  Dim cmb As ComboBox = DirectCast(sender, ComboBox)
  Dim dr As DataRowView = DirectCast(cmb.Items(e.Index), DataRowView)
  e.DrawBackground()
  e.Graphics.DrawString(dr(cmb.DisplayMember).ToString(), e.Font, New  SolidBrush(Color.Gray), e.Bounds.X, e.Bounds.Y)
End If