我希望清除datagridview单元格并保持焦点

Question

我有一个Datagridview，包含4列Item，Qty，Price，Amount。用户应在第一列中输入项目名称。我在数据库中有一个表，存储了所有项目名称。因此，如果插入的名称在数据库中，则应该检查它。如果它不在数据库中，我希望像TextBox一样清除单元格，焦点仍然在那个单元格中。用户不应该被允许继续，直到他输入正确的项目名称...到目前为止，我已经尝试过这个

Private Sub DataGridView1_CellEndEdit(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellEndEdit

        connect()
        sql = "Select ProductName from Products where ProductName = '" & Me.DataGridView1.Rows(e.RowIndex).Cells(0).Value.ToString & "' "
        objcmd = New SqlCommand(sql, objcon)
        OBJDR = objcmd.ExecuteReader
        If OBJDR.Read = False Then
            MessageBox.Show("Item Name Is not in the Items list", "Item Name Error", MessageBoxButtons.OK, MessageBoxIcon.Error)   
                     ''clearing the cell    '    
            Me.DataGridView1.Rows(e.RowIndex).Cells(0).Value = ""
            '' here i want the cell to get foucus and the cursor remain like textbox
            DataGridView1.CurrentCell = DataGridView1.Rows(DataGridView1.CurrentCell.RowIndex).Cells(0)
            ' DataGridView1.BeginEdit(True)
            Exit Sub
        End If
 End Sub

这是我的datagridview的图像

datagridview2

这是一个datagridview，在用户输入时显示给用户，因此他可以从中选择项目名称。它的工作方式类似于ComboBox AutoComplete。

Answer 1

最后我得到了我想要的东西。我把代码放在单元格验证事件

中

Private Sub DataGridView1_CellValidating(sender As Object, e As DataGridViewCellValidatingEventArgs) Handles DataGridView1.CellValidating
       With DataGridView1.Rows(e.RowIndex)
           If e.ColumnIndex = 0 Then
               If Not ItemExists(.Cells(e.ColumnIndex).Value) Then
                   MessageBox.Show("Item Name Is not in the Items list", "Item Name Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
                   e.Cancel = True
               End If
           End If
       End With
   End Sub

Function ItemExists(ByVal itemname As String) As Boolean
      Dim bResult As Boolean = True

      connect()
      Sql = "Select ProductName from Products where ProductName = '" & itemname & "' "
      objcmd = New SqlCommand(Sql, objcon)
      OBJDR = objcmd.ExecuteReader
      If OBJDR.Read = False Then
          bResult = False
      End If

      Return bResult
  End Function