Question

我正在尝试实施自定义事件，但由于某些原因，我无法退订事件

我正在使用带组合框单元格的datagridview。我还在该组合框上创建了一个自定义事件来处理我的数据。如果在新的特定列上按键盘上的空格键，将出现一个搜索表单。问题是，如果我第一次按该搜索表单，则会出现一次。如果我在不同的行但相同的列上第二次再次按它，则搜索表单将出现两次。如果我再按一次，它将显示3倍，并且每次按空格时，它将增加越来越多的内容。我的退订事件似乎由于某种原因而无法正常运行。我尝试将文本框用作列，但存在相同的问题。您能指出我做错了什么吗？是我的退订代码错误还是datagridview editcontrol上显示某些我不知道的东西。

private void dtgClientInfo_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
    {
        var senderGrid = (DataGridView)sender;
        //declare my custom event
        KeyPressEventHandler mykeypress = delegate (object sender1, KeyPressEventArgs e1)
        {
            ShowSearchbox_KeyPress(sender1, e1, senderGrid.CurrentCell);
        };
        //e.Control.KeyPress -= new KeyPressEventHandler(mykeypress); -- this code is not working
        e.Control.KeyPress -= mykeypress; // for some reason its not working
        if (senderGrid.CurrentCell.ColumnIndex == senderGrid.Columns["mainmemberid"].Index )
        {
            ComboBox searchBox = e.Control as ComboBox;
            if (searchBox != null)
            {
                searchBox.DropDownStyle = ComboBoxStyle.DropDown;
                searchBox.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
                // searchBox.KeyPress -= mykeypress; // unsubscribing to event before subscribing again but its not working
                searchBox.KeyPress += mykeypress; // subscribe to event
            }
        }
    }


//custom event
 private void ShowSearchbox_KeyPress(object sender, KeyPressEventArgs e, DataGridViewCell cell)
    {
        //custom keypress to determine who calls and returns 
        if (e.KeyChar == (char)Keys.Space) //when spacebar is pressed
        {
            //when spacebar is press then this event will occur
            ClientSearchFrm search = new ClientSearchFrm();
            //instatiate form to search
            search.ShowDialog();
            DataRow SearchedRow = search.getMemberInfo();
            if (SearchedRow == null)
            {
                cell.DataGridView.Rows[cell.RowIndex].Cells[cell.ColumnIndex].Value = null;
            }
            else
            {
                cell.DataGridView.Rows[cell.RowIndex].Cells[cell.ColumnIndex].Value = SearchedRow["memberid"].ToString();
            }
            cell.DataGridView.EndEdit();

            search.Dispose();
            e.Handled = true;
        }
    }

即使我在另一行上多次按空格键，输出也只能显示一次

取消订阅datagridview EditingControlShowing C＃

0 个答案: