已筛选组合框上的箭头键

本文关键字:筛选 组合 | 更新日期: 2023-09-27 18:29:11

我有一个简单的组合框,其中有一个使用.DefaultView作为项源的数据表。我在组合框上放置了一个过滤器,代码如下:

    private void FilterCombobox(ComboBox cmb, string columnName)
    {
        DataView view = (DataView)cmb.ItemsSource;
        view.RowFilter = (columnName + " like '*" + cmb.Text + "*'");
        cmb.ItemsSource = view;
        cmb.IsDropDownOpen = true;
    }

组合框的XAML为:

<ComboBox x:Name="cmbRigNum" KeyboardNavigation.TabIndex="3" HorizontalAlignment="Left" Margin="470,440,0,0" VerticalAlignment="Top" Width="206" SelectionChanged="cmbRigNum_SelectionChanged" IsEditable="True" StaysOpenOnEdit="True" IsTextSearchEnabled="False" FontFamily="Arial" FontSize="14" KeyUp="cmbRigNum_KeyUp"/>     

更新:Key_Up事件:

    private void cmbRigNum_KeyUp(object sender, KeyEventArgs e)
    {
        FilterCombobox(cmbRigNum, "RigNumber");         
    }

当用户键入时,一切都很好,但一旦使用箭头键进行选择,过滤后的列表就会消失,组合框中的值也会被清除。如何让用户使用箭头键浏览用户最初键入时显示的筛选列表?

已筛选组合框上的箭头键

我怀疑它是您的"cmbRigNum_KeyUp"方法中的某个东西。

编辑:所以,如果你不想让它用箭头键改变过滤器,你能做这样的事情吗?

private void cmbRigNum_KeyUp(object sender, KeyEventArgs e)
{
    if (char.IsLetter(e.Keychar) || char.IsDigit(e.KeyChar)) // Add more characters as needed.
    {
        FilterCombobox(cmbRigNum, "RigNumber");
    {
}

在考虑了@Topher Birth给出的建议后,我找到了解决问题的方法。对于任何在同一问题上挣扎的人来说,这里是解决问题的代码:

     private void FilterCombobox(ComboBox cmb, string columnName)
    {
        //because the itemsSource of the comboboxes are datatables, filtering is not supported. Converting the itemsSource to a
        //dataview will allow the functionality of filtering to be implemented
        DataView view = (DataView)cmb.ItemsSource;
        view.RowFilter = (columnName + " like '*" + cmb.Text + "*'");
        cmb.ItemsSource = view;
        cmb.IsDropDownOpen = true;
    }
    private void cmbRigNum_KeyUp(object sender, KeyEventArgs e)
    {
        if (e.Key != Key.Down & e.Key != Key.Up) 
        {
            e.Handled = true;
            FilterCombobox(cmbRigNum, "RigNumber");
        }
    }

真不敢相信事情竟然这么简单。感谢所有的投入!