我想知道是否可以使用Key.Delete
刪除突出顯示的項目,而DropDown
是打開的?從DropDown中刪除選定的項目(突出顯示)
example http://iforce.co.nz/i/eolrdqjq.mx3.png
我已經試過..
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" />
結合SnpCodeModel
類
class SnpCodeModel
{
public string SnpCode { get; set; }
public SnpCodeModel(string _snpcode)
{
this.SnpCode = _snpcode;
}
}
我也曾嘗試發佈該解決方案通過Harold Bamford對#1問題: 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:-(併產生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')
我目前的嘗試主要問題是因爲ComboBox
是可編輯的,我試圖刪除的項目變爲null
,然後它達到cbkSnpCodes.Items.Remove
。
是否有可能實現我正在尋找的功能?我一直未能在google上找到太多