WPF：两个控件绑定到一个源，如何过滤绑定？

Question

我有一个 WPF windows 应用程序项目，它有一个带有两个 ListBox 控件的窗口，问题是如何将一个源绑定到这两个控件？ 来源是这样的：

class student
{
    public string name{get;set;}
    public int age{get;set;}
}

ObservableCollection<student> m_myGroup;

我想：如果年龄 > 25，ListBox1 绑定到 m_myGroup 如果年龄

TextBlock Text={binding Path=name}

并且我不想使用 DataTrigger 将项目可见性属性隐藏或显示，我尝试使用 ICollectionView 过滤源，但它会影响其他 ListBox！ 有谁知道如何为每个 ListBox 制作两个过滤器，并且它们只绑定到一个源？

Answer 1

为 m_myGroup 创建两个ICollectionView，过滤它们并将它们绑定到ListBoxes。

就此而言，将ListBox.IsSynchronizedWithCurrentItem 设置为false 将不会在选择时ListBoxes 之间产生影响。

见this。

编辑：

public class StudentHandler
{
    ObservableCollection<student> m_myGroup;

    public CollectionViewSource YoungStudentsViewSource { get; private set; }
    public CollectionViewSource OldStudentsViewSource { get; private set; }

    public StudentHandler
    {
        YoungStudentsViewSource = new CollectionViewSource {Source = m_myGroup};
        OldStudentsViewSource = new CollectionViewSource {Source = m_myGroup}; 

        YoungStudentsViewSource.Filter = (stud) => {return (stud as student).age<=25;};
        OldStudentsViewSource .Filter = (stud) => {return (stud as student).age>25;};
    }
}

在此之后将ViewSources 绑定到ListBoxes

Answer 2

<Window x:Class="ComboboxStyle.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:converter="clr-namespace:ComboboxStyle"
    Title="MainWindow" Height="350" Width="525">
<Window.Resources>
    <converter:AgeConverter x:Key="ageConv"/>
</Window.Resources>

<Grid >
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*"/>
        <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>
    <ListBox Grid.Column="0"  DisplayMemberPath="Name" ItemsSource="{Binding Students, Converter={StaticResource ageConv}, ConverterParameter=agelessthan25}" >
    </ListBox>
    <ListBox  Grid.Column="1" DisplayMemberPath="Name" ItemsSource="{Binding Students, Converter={StaticResource ageConv}, ConverterParameter=agegreaterthan25}" >
    </ListBox>
</Grid>

 public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        Students = new ObservableCollection<Student>();
        Students.Add(new Student() { Name = "Aeqwwe", Age = 24 });
        Students.Add(new Student() { Name = "bqwewqeq", Age = 28 });
        Students.Add(new Student() { Name = "cwqeqw", Age = 23 });
        Students.Add(new Student() { Name = "dweqqw", Age = 29 });
        Students.Add(new Student() { Name = "eqweweq", Age = 20 });
        DataContext = this;
    }
    public ObservableCollection<Student> Students { get; set; }
}
public class Student
{
    public string Name { get; set; }
    public int Age { get; set; }
}
public class AgeConverter : IValueConverter
{

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        var items = value as ObservableCollection<Student>;
        if (parameter != null && items != null)
        {
            if (parameter.ToString() == "agelessthan25")
            {
                return items.Where(i => i.Age < 25).ToList();
            }
            else if (parameter.ToString() == "agegreaterthan25")
            {
                return items.Where(i => i.Age >= 25).ToList();
            }
        }
        return null;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

我希望这会有所帮助