WPF将列表绑定到树视图并分组

我的ViewModel中有一个列表。我想根据属性将此列表对象分组，并在Treeview中显示它

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我通过使用CollectionViewSource成功地做到了这一点。创建CollectionViewSource并设置组描述

    <CollectionViewSource Source="{Binding ProductList}"
                          x:Key="Items">
        <CollectionViewSource.GroupDescriptions>
            <PropertyGroupDescription PropertyName="Category" />
        </CollectionViewSource.GroupDescriptions>
    </CollectionViewSource>

我在列表框中使用了GroupStyle来实现分组。但是，由于您需要树状视图UI，我们需要自定义GroupItem的ContainerStyle。将TreeViewItem模板放置到容器样式中。我实际上是从复制了TreeViewItem的默认模板

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使用以下内容更改Product&ProductViewModel类：

class ProductsViewModel
{
    private List<Product> productList;

    public List<Product> ProductList
    {
        get 
        { return productList; }
        set 
        { productList = value; }
    }
}

class Product
{
    private string name;

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

    private string category;

    public string Category
    {
        get { return category; }
        set { category = value; }
    }

    private double price;

    public double Price
    {
        get { return price; }
        set { price = value; }
    }
}

MainWindow.xaml

<Window x:Class="WpfApplication11.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">
    <Grid>
        <TreeView x:Name="treeView" HorizontalAlignment="Left" Height="178" Margin="85,24,0,0" VerticalAlignment="Top" Width="279"/>

    </Grid>
</Window>

主窗口构造函数：

    public MainWindow()
    {
        ProductsViewModel viewModel = new ProductsViewModel();
        viewModel.ProductList = new List<Product>();
        viewModel.ProductList.Add(new Product() { Name = "ABC", Category ="1", Price = 100 });
        viewModel.ProductList.Add(new Product() { Name = "PQR", Category = "2", Price = 100 });
        viewModel.ProductList.Add(new Product() { Name = "ABC", Category = "3", Price = 100 });
        viewModel.ProductList.Add(new Product() { Name = "XYZ", Category = "2", Price = 100 });

        InitializeComponent();

        var GetCategories = viewModel.ProductList.Select(p => p.Category).Distinct();
        foreach (var item in GetCategories)
        {
            TreeViewItem node = new TreeViewItem() { Header = item };
            treeView.Items.Add(node);
            var products = viewModel.ProductList.Where(p => p.Category == item).Select(p => p.Name).Distinct();
            foreach (var product in products)
            {
                node.Items.Add(product);
            }
        }
    }

class ProductsViewModel
{
    private List<Product> productList;

    public List<Product> ProductList
    {
        get 
        { return productList; }
        set 
        { productList = value; }
    }
}

class Product
{
    private string name;

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

    private string category;

    public string Category
    {
        get { return category; }
        set { category = value; }
    }

    private double price;

    public double Price
    {
        get { return price; }
        set { price = value; }
    }
}

<Window x:Class="WpfApplication11.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">
    <Grid>
        <TreeView x:Name="treeView" HorizontalAlignment="Left" Height="178" Margin="85,24,0,0" VerticalAlignment="Top" Width="279"/>

    </Grid>
</Window>

    public MainWindow()
    {
        ProductsViewModel viewModel = new ProductsViewModel();
        viewModel.ProductList = new List<Product>();
        viewModel.ProductList.Add(new Product() { Name = "ABC", Category ="1", Price = 100 });
        viewModel.ProductList.Add(new Product() { Name = "PQR", Category = "2", Price = 100 });
        viewModel.ProductList.Add(new Product() { Name = "ABC", Category = "3", Price = 100 });
        viewModel.ProductList.Add(new Product() { Name = "XYZ", Category = "2", Price = 100 });

        InitializeComponent();

        var GetCategories = viewModel.ProductList.Select(p => p.Category).Distinct();
        foreach (var item in GetCategories)
        {
            TreeViewItem node = new TreeViewItem() { Header = item };
            treeView.Items.Add(node);
            var products = viewModel.ProductList.Where(p => p.Category == item).Select(p => p.Name).Distinct();
            foreach (var product in products)
            {
                node.Items.Add(product);
            }
        }
    }