Question

我有一个非常简单的WPF应用程序，它显示一个ComboBox，它绑定到代表人的类列表。每个'Person'对象都有一个Name字符串字段和一个Sex enum。我希望ComboBox显示各种人物名称字段的下拉列表，但是根据性别字段对每一行进行样式设置，例如，蓝色表示男性，粉红色表示女性。谁能告诉我我做错了什么？

这是XML：

<Window x:Class="ComboBoxColour.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <StackPanel Orientation="Vertical">
        <ComboBox ItemsSource="{Binding People}" Width="100" Height="20">
            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Name="somePerson" Text="{Binding Path=Name}">                        
                        <TextBlock.Triggers>
                            <DataTrigger Binding="{Binding Path=Sex}" Value="Male">
                                <DataTrigger.Setters>
                                    <Setter Property="Foreground" Value="Blue" TargetName="somePerson" />
                                </DataTrigger.Setters>
                            </DataTrigger>
                        </TextBlock.Triggers>                        
                    </TextBlock>
                </DataTemplate>
            </ComboBox.ItemTemplate>
        </ComboBox>
    </StackPanel>
</Window>

这是C＃：

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;
using System.Collections.ObjectModel;

namespace ComboBoxColour
{
  /// <summary>
  /// Interaction logic for MainWindow.xaml
  /// </summary>
  public partial class MainWindow : Window
  {
    public List<Person> people;
    public List<Person> People
    {
      get { return people; }
      set { people = value; }
    }

    public MainWindow()
    {
      this.DataContext = this;

      People = new List<Person>();
      People.Add(new Person("Alice", SexEnum.Female));
      People.Add(new Person("Bob", SexEnum.Male));
      People.Add(new Person("Claire", SexEnum.Female));
      People.Add(new Person("Daniel", SexEnum.Male));

      InitializeComponent();
    }
  }

  public enum SexEnum{Male,Female};

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

    private SexEnum sex;
    public SexEnum Sex
    {
      get { return sex; }
      set { sex = value; }
    }

    public Person(string Name, SexEnum Sex)
    {
      this.Name = Name;
      this.Sex = Sex;
    }
  }
}

非常感谢提前

Answer 1

使用ItemContainerStyle代替ItemTemplate：

    <ComboBox ItemsSource="{Binding People}" Width="100" Height="20">
        <ComboBox.ItemContainerStyle>
            <Style TargetType="ComboBoxItem">
                <Setter Property="Foreground" Value="Pink" />
                <Style.Triggers>
                    <DataTrigger Binding="{Binding Path=Sex}" Value="Male">
                        <Setter Property="Foreground" Value="Blue" />
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </ComboBox.ItemContainerStyle>
    </ComboBox>

Answer 2

您应该使用“Style”触发器而不是“TextBlock.Triggers”

使用此XAML：

<Window x:Class="ComboBoxColour.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <StackPanel Orientation="Vertical">
        <ComboBox ItemsSource="{Binding People}" Width="100" Height="20">
            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Name="somePerson" Text="{Binding Path=Name}">
                        <TextBlock.Style>
                            <Style TargetType="TextBlock">
                                <Style.Triggers>
                                    <DataTrigger Binding="{Binding Path=Sex}" Value="Male">
                                        <DataTrigger.Setters>
                                            <Setter Property="Foreground" Value="blue"/>
                                        </DataTrigger.Setters>
                                    </DataTrigger>
                                    <DataTrigger Binding="{Binding Path=Sex}" Value="Female">
                                        <DataTrigger.Setters>
                                            <Setter Property="Foreground" Value="Pink"/>
                                        </DataTrigger.Setters>
                                    </DataTrigger>
                                </Style.Triggers>
                            </Style>
                        </TextBlock.Style>
                    </TextBlock>
                </DataTemplate>
            </ComboBox.ItemTemplate>
        </ComboBox>
    </StackPanel>
</Window>

现在你的男性为蓝色，女性为粉红色。

样式化WPF ComboBox项目

2 个答案: