XAML代码

<Window x:Class="WpfApplication73.MainWindow"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

xmlns:local="clr-namespace:WpfApplication73"

mc:Ignorable="d"

Title="MainWindow" Height="350" Width="525">

<Grid>

<TreeView ItemsSource="{Binding}">

<TreeView.Resources>

<HierarchicalDataTemplate DataType="{x:Type local:Class1}" ItemsSource="{Binding Races}">

<TextBlock Text="{Binding Year}"/>

</HierarchicalDataTemplate>

<HierarchicalDataTemplate DataType="{x:Type local:F1Race}" ItemsSource="{Binding Results}">

<StackPanel Orientation="Horizontal">

<TextBlock Text="{Binding Country}"/>

<TextBlock Text="{Binding Date,StringFormat=d}"/>

</StackPanel>

</HierarchicalDataTemplate>

<HierarchicalDataTemplate DataType="{x:Type local:F1RaceResult}">

<StackPanel Orientation="Horizontal">

<TextBlock Text="{Binding Position}"/>

<TextBlock Text="{Binding Racer}"/>

</StackPanel>

</HierarchicalDataTemplate>

</TreeView.Resources>

</TreeView>

</Grid>

</Window>

隐藏代码：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

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 WpfApplication73

{

/// <summary>

/// Interaction logic for MainWindow.xaml

/// </summary>

public partial class MainWindow : Window

{

public Formula1v2Entities data = new Formula1v2Entities();

public MainWindow()

{

InitializeComponent();

this.DataContext = Years;

}

public IEnumerable<Class1> Years

{

get

{

F1DataContext.Data = data;

return data.Races.Select(r => new Class1

{

Year = r.Date.Year

}).Distinct().OrderBy(c => c.Year).ToList();

//return (from r in data.Races

//        select new Class1

//        {

//           Year= r.Date.Year

//        }).ToList();

}

}

}

}

Class1代码，用来产生TreeView控件使用的集合

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace WpfApplication73

{

public static class F1DataContext

{

public static Formula1v2Entities Data { get; set; }

}

public　class Class1

{

public int Year { get; set; }

public IEnumerable<F1Race>Races

{

get

{

return (from r in F1DataContext.Data.Races

where r.Date.Year == Year

orderby r.Date

select new F1Race

{

Date = r.Date,

Country = r.Circuits.Country

}).ToList();

}

}

}

public　class F1Race

{

public string Country { get; set; }

public DateTime Date { get; set; }

public IEnumerable<F1RaceResult> Results

{

get

{

return (from rr in F1DataContext.Data.RaceResults

where rr.Races.Date == this.Date

select new F1RaceResult

{

Position = rr.Position,

Racer = rr.Racers.FirstName + " " + rr.Racers.LastName

}).ToList();

}

}

}

public class F1RaceResult

{

public int Position { get; set; }

public string Racer { get; set; }

}

}