Force datagridview call row validating after finish input

Question

I'm creating a Form with a Bound Datagridview inside it. On Form_Load or Row_Validating, I added new row to Datagridview by:

Private Sub PurchaseInRowAdd()
        'add new row to datagridview
        Dim dtRow As DataRow = CType(Me.dgvPurchaseIn.DataSource, DataTable).NewRow()
        dtRow.Item("InvoiceID") = 0
        dtRow.Item("KindID") = CType(CType(Me.dgvPurchaseIn.Columns("colPurchaseKind"), DataGridViewComboBoxColumn).DataSource, DataTable).Rows(0)("KindID")
        dtRow.Item("InvoiceSign") = ""
        dtRow.Item("InvoiceNo") = ""
        dtRow.Item("InvoiceDate") = New Date(objController.ProcessYear, objController.ProcessMonth, 1)
        dtRow.Item("ID") = CType(CType(Me.dgvPurchaseIn.Columns("colPurchaseCustomer"), DataGridViewComboBoxColumn).DataSource, DataTable).Rows(0)("ID")
        dtRow.Item("Product") = ""
        dtRow.Item("Price") = "0.00"
        dtRow.Item("Note") = ""
        dtRow.Item("Tax") = CType(CType(Me.dgvPurchaseIn.Columns("colPurchaseKind"), DataGridViewComboBoxColumn).DataSource, DataTable).Rows(0)("Tax")
        dtRow.Item("TaxCode") = CType(CType(Me.dgvPurchaseIn.Columns("colPurchaseCustomer"), DataGridViewComboBoxColumn).DataSource, DataTable).Rows(0)("TaxCode")
        dtRow.Item("VAT") = ""

        CType(Me.dgvPurchaseIn.DataSource, DataTable).Rows.Add(dtRow)
    End Sub

The problem here is, when user finished input in that new row and press enter, Row_Validating hasn't been fired because there's no row below it. So how can I force Row_Validating trigger when user finished input and press enter?

I have found this solution, but it doesn't suit my case because I don't want to set Enable Adding to True. I want to handle row adding by code instead.

Answer 1

I found the solution, I subclassed DataGridView and override ProcessDialogKey like this:

protected override bool ProcessDialogKey(Keys keyData)
        {
            if(keyData == Keys.Enter)
            {
                KeyEnterPress(this, new EventArgs());
            }
            return base.ProcessDialogKey(keyData);
        }

(I wrote this subclass in C#)

Then handle key enter press in my form like this

Private Sub PurchaseInCellKeyDown(ByVal sender As Object, ByVal e As EventArgs)
        If Me.dgvPurchaseIn.CurrentRow.Index = Me.dgvPurchaseIn.Rows.Count - 1 Then
            If PurchaseInRowValidate(Me.dgvPurchaseIn.CurrentRow.Index, True) Then
                Me.PurchaseInRowAdd()
                Me.deselectPurchaseCell(Me.dgvPurchaseIn.CurrentRow.Index)
                Me.dgvPurchaseIn.Rows(Me.dgvPurchaseIn.Rows.Count - 1).Cells("colPurchaseSign").Selected = True
            End If
        End If
    End Sub

This line:

Me.dgvPurchaseIn.Rows(Me.dgvPurchaseIn.Rows.Count - 1).Cells("colPurchaseSign").Selected = True

will trigger row validating