下面的示例禁止指派无效的“Budget”列单元格取值。 此单元格的取值应大于 0，并且小于 1,000,000。 BaseView.ValidatingEditor 事件被接管，以检查输入值的有效性。 BaseView.InvalidValueException 事件被接管，如果指派了无效的单元格取值，则显示一个异常消息框。 在这种情况下 GridView.HideEditor 方法被调用，以放弃所作出的更改并销毁单元格的编辑器。

C#CopyCode image复制代码
using DevExpress.XtraEditors.Controls;
// ...
private void gridView1_ValidatingEditor(object sender, ValidatingEditorEventArgs e) {
   if (gridView1.FocusedColumn.Name != "colBudget") return;
   if ((Convert.ToInt32(e.Value) < 0) || (Convert.ToInt32(e.Value) > 1000000))
      e.Valid = false;
}

private void gridView1_InvalidValueException(object sender, InvalidValueExceptionEventArgs e) {
    e.ExceptionMode = ExceptionMode.DisplayError;
    e.WindowCaption = "Input Error";
    e.ErrorText = "The value should be greater than 0 and less than 1,000,000";

    // Destroying the editor and discarding the changes made within the edited cell
    gridView1.HideEditor();
}
Visual BasicCopyCode image复制代码
Imports DevExpress.XtraEditors.Controls
' ...
Private Sub GridView1_ValidatingEditor(ByVal sender As Object, _
  ByVal e As ValidatingEditorEventArgs) Handles GridView1.ValidatingEditor
   If GridView1.FocusedColumn.Name <> "colBudget" Then Exit Sub
   If (Convert.ToInt32(e.Value) < 0) Or (Convert.ToInt32(e.Value) > 1000000) Then
      e.Valid = False
   End If
End Sub

Private Sub GridView1_InvalidValueException(ByVal sender As Object, _
  ByVal e As ValidatingEditorEventArgs) Handles GridView1.InvalidValueException
   e.ExceptionMode = ExceptionMode.DisplayError
   e.WindowCaption = "Input Error"
   e.WindowText = "The value should be greater than 0 and less than 1,000,000"

   ' Destroying the editor and discarding the changes made within the edited cell
   GridView1.HideEditor()
End Sub