我想知道是否可以使用Key.Delete
删除突出显示的项目,而DropDown
是打开的?从DropDown中删除选定的项目(突出显示)
example http://iforce.co.nz/i/eolrdqjq.mx3.png
我已经试过..
C#
private void OnKeyUpHandler(object sender, KeyEventArgs e)
{
Boolean delete = e.Key == Key.Delete;
if (sender == cbkSnpCodes && (delete && cbkSnpCodes.IsDropDownOpen))
{
cbkSnpCodes.Items.Remove(cbkSnpCodes.SelectedItem);
cbkSnpCodes.Items.Refresh();
}
}
XAML
<ComboBox ItemsSource="{Binding SnpCodeModel}" Name="cbkSnpCodes" Controls:TextboxHelper.Watermark="Enter an snp code and press enter" MaxDropDownHeight="50" KeyUp="OnKeyUpHandler" KeyDown="OnKeyDownHandler" DisplayMemberPath="SnpCode" IsEditable="True" HorizontalAlignment="Left" VerticalAlignment="Top" Text="{Binding Path=SnpCode, Mode=TwoWay}" IsReadOnly="False" Height="26" Margin="81,9,0,0" Width="223" Grid.Column="1" Grid.ColumnSpan="2" />
结合SnpCodeModel
类
class SnpCodeModel
{
public string SnpCode { get; set; }
public SnpCodeModel(string _snpcode)
{
this.SnpCode = _snpcode;
}
}
我也曾尝试发布该解决方案通过Harold Bamford对#1问题: In a combobox, how do I determine the highlighted item (not selected item)?
private void OnKeyUpHandler(object sender, KeyEventArgs e)
{
Boolean delete = e.Key == Key.Delete;
ComboBox box = sender as ComboBox;
if (box.IsDropDownOpen && delete)
{
const BindingFlags flags = BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance;
PropertyInfo hl = box.GetType().GetProperty("HighlightedItem", flags);
if (hl != null)
{
String hlString = hl.GetValue(sender, null).ToString();
SnpCodeModel snp = new SnpCodeModel(hlString);
cbkSnpCodes.Items.Remove(snp);
cbkSnpCodes.Items.Refresh();
}
}
}
但它不工作:-(并产生System.Diagnostics;
System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='System.Windows.Controls.ItemsControl', AncestorLevel='1''. BindingExpression:Path=VerticalContentAlignment; DataItem=null; target element is 'ComboBoxItem' (Name=''); target property is 'VerticalContentAlignment' (type 'VerticalAlignment')
我目前的尝试主要问题是因为ComboBox
是可编辑的,我试图删除的项目变为null
,然后它达到cbkSnpCodes.Items.Remove
。
是否有可能实现我正在寻找的功能?我一直未能在google上找到太多