Question

我有一个绑定到数据源的datagridview。我试图用datagridviewcomboboxcolumn替换DGV的第一列，但它给了我以下例外：

无法将对象转换为类型＆system; system.argumentexception＆＃39;输入＆＃39; system.windows.forms.iwin32window＆＃39;

这是我的代码。

Public Sub formdata()
    Try

        Dim query As String = "select th.catalogue,th.name,pi.itemcode,th.itemcode,pi.party_code " _
        & "from partyitem pi,itemhead th where th.itemcode=pi.itemcode and pi.party_code=" & valpartycode & " order by th.catalogue"

        adap = New OleDbDataAdapter(query, conn)
        ds = New DataSet
        ds.Clear()
        adap.Fill(ds, "partyitem")
        DataGridView1.DataSource = ds.Tables(0)

        DataGridView1.Columns.Item(0).HeaderText = "CATALOGUE"
        DataGridView1.Columns.Item(0).Width = 180
        DataGridView1.Columns.Item(1).HeaderText = "NAME"
        DataGridView1.Columns.Item(1).Width = 350
        DataGridView1.Columns.Item(2).Visible = False
        DataGridView1.Columns.Item(3).Visible = False
        DataGridView1.Columns.Item(4).Visible = False

        Dim query1 As String = "select catalogue from itemhead where itemcode not in" _
                       & "(select itemcode from partyitem where party_code=" & valpartycode & ") order by catalogue"

        adapnew = New OleDbDataAdapter(query1, conn)
        Dim ds1 As New DataSet
        adapnew.Fill(ds1, "itemhead")

        Me.DataGridView1.Columns.Remove("catalogue")
        Dim datacol As New DataGridViewComboBoxColumn
        With datacol
            .Name = "catalogue"
            .DataPropertyName = "catalogue"
            .DataSource = ds1.Tables(0)
            .ValueMember = "catalogue"
            .DisplayMember = "catalogue"
            .HeaderText = "CATALOGUE"
            .FlatStyle = FlatStyle.Flat
            .DropDownWidth = 160
            .Width = 200
        End With
        Me.DataGridView1.Columns.Insert(0, datacol)

    Catch ex As Exception
        MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error)
    End Try
End Sub

我在下面的datagridview中以另一种形式做了同样的事情，它工作得很好，而且代码就是这里。

Public Sub formdata()
    Try
        Dim query As String = "SELECT Itemcategory.categoryname," _
                              & "PartyDiscount.discount,PartyDiscount.cash_discount,PartyDiscount.turnover_discount" _
                                & " from Itemcategory,PartyDiscount where PartyDiscount.category=Itemcategory.categorycode" _
                                & " and PartyDiscount.party_code=" & valpartycode & " order by itemcategory.categoryname"

        adap = New OleDbDataAdapter(query, conn)
        ds = New DataSet
        ds.Clear()
        adap.Fill(ds, "partydiscount")
        DataGridView1.DataSource = ds.Tables(0)

        DataGridView1.Columns.Item(0).HeaderText = "PRODUCT GROUP"
        'DataGridView1.Columns.Item(0).Width = 170
        DataGridView1.Columns.Item(1).HeaderText = "DISCOUNT"
        DataGridView1.Columns.Item(1).Width = 90
        DataGridView1.Columns.Item(2).HeaderText = "CASH DISCOUNT"
        DataGridView1.Columns.Item(2).Width = 90
        DataGridView1.Columns.Item(3).HeaderText = "TURNOVER DISCOUNT"
        DataGridView1.Columns.Item(3).Width = 95

        adapnew = New OleDbDataAdapter("Select categoryname from itemcategory where itemtype='F' order by categoryname", conn)
        Dim dsnew As New DataSet
        adapnew.Fill(dsnew, "itemcategory")

        Me.DataGridView1.Columns.Remove("categoryname")
        Dim datacol As New DataGridViewComboBoxColumn
        With datacol
            .Name = "categoryname"
            .DataPropertyName = "categoryname"
            .DataSource = dsnew.Tables(0)
            .ValueMember = "categoryname"
            .DisplayMember = "categoryname"
            .HeaderText = "PRODUCT GROUP"
            .FlatStyle = FlatStyle.Flat
            .DropDownWidth = 160
            .Width = 200
        End With
        Me.DataGridView1.Columns.Insert(0, datacol)

    Catch ex As Exception
        MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error)
    End Try
End Sub

不知道为什么上面的代码出错了。请帮帮我。

修改

堆栈跟踪：

在MYsoft.PMitemlist.datagridview1_dataerror（Object sender，datagridviewdataerroreventargs e）中 E：\ Harry \ Mysoft \ MYSOFT \ PMitemlist.vb：list 226

编辑2：

Try
    Dim a As Exception = e.Exception
Catch ex As Exception
    MessageBox.Show(ex.StackTrace.ToString, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try

它还提供以下异常

system.argumentexception：datagridviewcomboboxcell值无效

无法将对象强制转换为'system.argumentexception'类型以键入'system.windows.forms.iwin32window'

0 个答案: