ListBox和DataTrigger

Question

爲什麼它不起作用？

的XAML：

<Window x:Class="WpfApplication1.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     Title="MainWindow" Height="218" Width="239"> 
    <Grid> 
     <ListBox Margin="12" Name="listBox1"> 
      <Style TargetType="{x:Type ListBoxItem}"> 
       <Style.Triggers> 
        <DataTrigger Binding="{Binding Path=Name}" Value="Gil"> 
         <Setter Property="ListBoxItem.Background" Value="Red" /> 
        </DataTrigger> 
       </Style.Triggers> 
      </Style> 
     </ListBox> 
    </Grid> 
</Window> 

守則

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 

namespace WpfApplication1 
{ 
    public class User 
    { 
     private string name; 
     private string role; 

     public User(string strName, string strRole) 
     { 
      Name = strName; 
      Role = strRole; 
     } 

     public string Name 
     { 
      get { return name; } 
      set { name = value; } 
     } 

     public string Role 
     { 
      get { return role; } 
      set { role = value; } 
     } 
    } 
} 

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Data; 
using System.Windows.Documents; 
using System.Windows.Input; 
using System.Windows.Media; 
using System.Windows.Media.Imaging; 
using System.Windows.Navigation; 
using System.Windows.Shapes; 

namespace WpfApplication1 
{ 
    /// <summary> 
    /// Interaction logic for MainWindow.xaml 
    /// </summary> 
    public partial class MainWindow : Window 
    { 
     public MainWindow() 
     { 
      InitializeComponent(); 

      List<User> list = new List<User>(); 
      list.Add(new User("Gil", "Programmer")); 
      list.Add(new User("Pavel", "Sport")); 
      list.Add(new User("Max", "Falafel")); 

      this.listBox1.Items.Clear(); 
      this.listBox1.ItemsSource = list; 
     } 
    } 
} 

Answer 1

設置ListBoxItem風格ListBox.ItemContainerStyle

<ListBox Margin="12" Name="listBox1"> 
    <ListBox.ItemContainerStyle> 
     <Style TargetType="{x:Type ListBoxItem}"> 
      <Style.Triggers> 
       <DataTrigger Binding="{Binding Path=Name}" Value="Gil"> 
        <Setter Property="ListBoxItem.Background" Value="Red" /> 
       </DataTrigger> 
      </Style.Triggers> 
     </Style> 
    </ListBox.ItemContainerStyle>    
</ListBox> 

Answer 2

您需要定義爲類一個DataTemplate並設置ItemContainerStyle：

<Window.Resources> 
     <Style TargetType="{x:Type ListBoxItem}" x:Key="TBStyle"> 
      <Style.Triggers> 
       <DataTrigger Binding="{Binding Name}" Value="Gil"> 
        <Setter Property="ListBoxItem.Background" Value="Red"/> 
       </DataTrigger> 
      </Style.Triggers> 
     </Style> 
    </Window.Resources> 
    <Grid> 
     <ListBox Margin="12" Name="listBox1" ItemContainerStyle="{StaticResource TBStyle}"> 
      <ListBox.ItemTemplate> 
       <DataTemplate> 
        <TextBlock Text="{Binding Name}"/> 
       </DataTemplate> 
      </ListBox.ItemTemplate> 
     </ListBox> 
    </Grid> 
</Window>