vb.net DataGridViewCombobox基于第一个dgv组合框过滤第二个dgv组合框的内容

Question

我有一个datagridivew，其中包含许多列，其中包含两个组合框。第一个组合框称为“ cbxCampaign2”，第二个组合框称为“ cbxPositionNo”。当使用表结果进行加载时，我会填充两个框，请参见此处的代码...

'Populate DataGrid3  - Applicant Offers and Recruit
        cmd = New SqlCommand("GetApplicantSuccessfulCampaigns", conn)
        cmd.Parameters.AddWithValue("@AppID", Me.intAppID)
        cmd.CommandType = CommandType.StoredProcedure
        da3 = New SqlDataAdapter(cmd)
        da3.Fill(ds, "CampignSuccess")
        Me.cbxCampaign2.DataSource = ds.Tables("CampignSuccess")
        Me.cbxCampaign2.DisplayMember = "CampaignName"
        Me.cbxCampaign2.ValueMember = "ID"

        ' Also changed when  Clicked in DGV3
        cmd = New SqlCommand("SELECT ID, PositionNo + ', ' + Title As PositionName FROM TblPosition ORDER By PositionNo ASC", conn)
        da3 = New SqlDataAdapter(cmd)
        da3.Fill(ds, "PositionNames")
        Me.cbxPositionNo.DataSource = ds.Tables("PositionNames")
        Me.cbxPositionNo.DisplayMember = "PositionName"
        Me.cbxPositionNo.ValueMember = "ID"

然后我正在尝试根据第一个组合框的值来过滤第二个组合框的内容。

到目前为止，我有两个事件CellBegin Edit和CellEndEdit并强制转换为新的“ dgvcbPositionNo”，为此添加了新的数据源，但是它不起作用并且不会产生错误！我添加了一些消息框，它们显示正确的结果！我觉得我错过了一些东西，但不确定在哪里！

请参见下面的代码...

 Private Sub DataGridView3_CellBeginEdit(sender As Object, e As DataGridViewCellCancelEventArgs) Handles DataGridView3.CellBeginEdit
    If e.ColumnIndex = 3 Then
        MsgBox(Me.DataGridView3.CurrentRow.Cells("cbxCampaign2").Value)
        ' Set the combobox cell datasource to the filtered BindingSource
        Dim dgvcbPostionNo As DataGridViewComboBoxCell = DirectCast(DataGridView1(e.ColumnIndex, e.RowIndex), DataGridViewComboBoxCell)

        cmd = New SqlCommand("SELECT ID, Title +', ' + PositionNo As PositionName FROM TblPosition WHERE ID IN (SELECT PositionID FROM TblCampaignPositions WHERE CampaignID = @CampID) ORDER By PositionNo", conn)
        cmd.Parameters.AddWithValue("@CampID", Me.DataGridView3.CurrentRow.Cells("cbxCampaign2").Value)
        da3 = New SqlDataAdapter(cmd)
        If Not IsNothing(ds.Tables("PositionFiltered")) Then
            ds.Tables("PositionFiltered").Rows.Clear()
        End If
        da3.Fill(ds, "PositionFiltered")
        MsgBox(ds.Tables("PositionFiltered").Rows.Count)
        dgvcbPostionNo.DataSource = ds.Tables("PositionFiltered")
        dgvcbPostionNo.DisplayMember = "PositionName"
        dgvcbPostionNo.ValueMember = "ID"
    End If
End Sub


Private Sub DataGridView3_CellEndEdit(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView3.CellEndEdit
    If e.ColumnIndex = 3 Then
        MsgBox("A")
        ' Set the combobox cell datasource to the filtered BindingSource
        Dim dgvcbPostionNo As DataGridViewComboBoxCell = DirectCast(DataGridView1(e.ColumnIndex, e.RowIndex), DataGridViewComboBoxCell)
        dgvcbPostionNo.DataSource = ds.Tables("PositionNames")
    End If
End Sub

结束班级