从DropDown中删除选定的项目（突出显示）

问题描述：

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;

内这种输出

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

答

您正在使用SnpCodeModel snp = new SnpCodeModel(hlString);创建一个SnpCodeModel的新实例。即使它具有相同的内容，它也不能在cbkSnpCodes中找到，因为它与HighlightedItem不同。

尝试像

 if (hl != null) 
     { 
      box.Items.Remove(hl.GetValue(sender, null)); 
      //box.Items.Refresh(); 
     }

或覆盖您的SnpCodeModel Equals方法：

public override bool Equals(object obj) 
    { 
     if (obj is SnpCodeModel) 
      return ((SnpCodeModel)obj).SnpCode == this.SnpCode 

     return false; 
    }

从DropDown中删除选定的项目（突出显示）

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