Question

我正在使用带有2个组合框列的datagridview来显示vb.net 2005中的帐户号和描述。

my query = "select acctno, acctdesc from mytable union select ' ','' from mytable" (why union? - so that once user selects acct no, can deselect)

我使用dataadapter将ds1和ds2填入上面的查询。

dim ds1 as new dataset
cmbcol1.datasource = ds1.tables(0).defaultview
cmbcol1.DisplayMember = "Acctno"
cmbCol1.ValueMember = "Acctno"

-----------------

dim ds2 as new dataset
cmbcol2.datasource = ds2.tables(0).defaultview
cmbcol2.DisplayMember = "Acctdesc"
cmbCol2.ValueMember = "Acctno"

-----------------

My code - 


    Private Sub dgvAcctSelect_EditingControlShowing(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles dgvAcctSelect.EditingControlShowing

            Try
                If dgv.CurrentCell.OwningColumn.Name = "ACCTNO" Then
                    Dim combo As ComboBox = TryCast(e.Control, ComboBox)
                    If combo IsNot Nothing Then
                        RemoveHandler  combo.SelectedIndexChanged,  
                                   AddressOf  combo_SelectedIndexChangedACCT
                        AddHandler  combo.SelectedIndexChanged, 
                                   AddressOfcombo_SelectedIndexChangedACCT
                    End If
                End If

                If dgv.CurrentCell.OwningColumn.Name = "ACCTDESC" Then
                    Dim combo As ComboBox = TryCast(e.Control, ComboBox)
                    If combo IsNot Nothing Then
                       RemoveHandler combo.SelectedIndexChanged, AddressOf 
                               combo_SelectedIndexChangedDESC
                       AddHandler combo.SelectedIndexChanged, AddressOf 
                               combo_SelectedIndexChangedDESC
                    End If
                End If

            Catch ex As Exception
            End Try

        End Sub

' IF USER SELECTS ACCTNO THEN AUTOMATICALLY CORRESPONDING ACCTDESC should be get selected IN OTHER COLUMN


     Private Sub combo_SelectedIndexChangedACCT(ByVal sender As Object, ByVal e As EventArgs)
            Try
                If dgv.CurrentCell.OwningColumn.Name = "ACCTCNO" Then
                    Dim cb As ComboBox = DirectCast(sender, ComboBox)
                    dgv.CurrentRow.Cells(1).Value = cb.SelectedValue
                End If
            Catch ex As Exception
            End Try

        End Sub



' IF USER SELECTS ACCTDESC THEN AUTOMATICALLY SELECT CORRESPONDING ACCTNO should be get selected IN OTHER COLUMN

    Private Sub combo_SelectedIndexChangedDESC(ByVal sender As Object, ByVal e As EventArgs)
        Try
            If dgvAcctSelect.CurrentCell.OwningColumn.Name = "ACCTDESC" Then
                Dim cb As ComboBox = DirectCast(sender, ComboBox)
                dgv.CurrentRow.Cells(0).Value = cb.SelectedValue
            End If
        Catch ex As Exception
        End Try

    End Sub

这使Cell值无效错误。

如果有人想尝试，只需使用2个comboboxcolumns的datagridview。从任何tbale显示任何2列，如id和desc。并尝试选择id并在其他列中自动显示desc。反之亦然

        Dim cmbCol1 As New DataGridViewComboBoxColumn
    Dim ds1 As DataSet
    Dim da1 As Data.SqlClient.SqlDataAdapter
    Try
        ds1 = New DataSet
        da1 = New Data.SqlClient.SqlDataAdapter("SELECT ACCTDESC ,ACCTNO FROM mytable union " & _
        "select ' ' as ACCTNO,'' as ACCTDESC from mytable order by ACCTno", sqlCon)
        ds1.Clear()
        da1.Fill(ds1, "ConnToSqlDrp1")
        If ds1 Is Nothing = False Then
            cmbCol1.DataSource = ds1.Tables("ConnToSqlDrp1").DefaultView
            cmbCol1.DisplayMember = "ACCTno"
            cmbCol1.ValueMember = "SACCTno"
        End If
    Catch ex As Exception
    End Try
    cmbCol1.DisplayStyle = DataGridViewComboBoxDisplayStyle.ComboBox
    cmbCol1.HeaderText = "Account No"
    cmbCol1.Name = "ACCTno"
    cmbCol1.Width = 150
    cmbCol1.AutoComplete = True
    .Add(cmbCol1)

    Dim cmbCol2 As New DataGridViewComboBoxColumn
    Dim ds2 As DataSet
    Dim da2 As Data.SqlClient.SqlDataAdapter
    Try
        ds2 = New DataSet
        da2 = New Data.SqlClient.SqlDataAdapter("SELECT ACCTNO,ACCTDESC FROM MYTABLE union " & _
       "select ' ' as ACCTNO,'' as ACCTDESC from MYTABLE order by ACCTDESC", sqlCon)
        ds2.Clear()
        da2.Fill(ds2, "ConnToSqlDrp2")
        If ds2 Is Nothing = False Then
            cmbCol2.DataSource = ds2.Tables("ConnToSqlDrp2").DefaultView
            cmbCol2.DisplayMember = "ACCTDESC"
            cmbCol2.ValueMember = "ACCTNO"
        End If
    Catch ex As Exception
    End Try
    cmbCol2.DisplayStyle = DataGridViewComboBoxDisplayStyle.ComboBox
    cmbCol2.HeaderText = "Consol Account Description"
    cmbCol2.Name = "ACCTDESC"
    cmbCol2.Width = 330
    cmbCol2.AutoComplete = True
    'cmbCol2.Visible = False
    .AdDcmbCol2)   



         **THIS IS MY CODE IN FORM LOAD EVENT SO IT SHOULD POPULATE ONLY ONCE.**

Answer 1

这可能会给你一个IndexOutOfBounds异常。实际上它应该给它两次。

dim ds1 as new dataset
cmbcol1.datasource = ds1.tables(0).defaultview

dim ds2 as new dataset
cmbcol2.datasource = ds2.tables(0).defaultview

当你创建一个Data.DataSet的新实例时，tables属性为空，所以没有实际填充数据集，我想知道你的应用程序是如何不抛出异常的？ ds1.tables数组中没有第0个表。如果这不会引发异常，那么程序的执行逻辑就会有缺陷。有些东西不会被调用，而某些东西应该填满数据集。如果没有填充数据集并将其附加到组合框，那么这些组合框将为空，其SelectedItem不会导致您获得Cell值错误。我希望这有帮助。检查你的代码。

在datagridview中添加2个组合框列

1 个答案: