关于DataGrid呈现数据的问题

[小紧张]

DataGrid dg

List<Activity> list //这是要呈现的数据合集

dg.ItemsSource = list;

在xaml里面加了一些列控件，然后绑定了Activity的一些我需要呈现的字段
如：
<DataGridTextColumn Header="活动名称" Binding="{Binding Path=name}"/>

现在遇到一个问题。
这个DataGrid需要呈现Activity以外的数据。
Activity是一个活动，一个活动对应了很多个报名信息（ActivityEnroll）。

我现在的想法是这样的
Dictionary<Activity, List<ActivityEnroll>> dictionary
用DataGrid来绑定dictionary是否能实现我想要的效果呢？如果可以，那么xaml里面的Binding该怎么写呢。

各位大大最好写点代码给小弟参考一下，感激不尽~~

[Bonjour-你好]

用一个ListBox绑定Dictionary<Activity, List<ActivityEnroll>>的Keys，DataGrid 根据 ListBox 的选项不同而呈现不同的 List<ActivityEnroll>。

[小紧张]

引用 1 楼 KumaPower 的回复:

用一个ListBox绑定Dictionary<Activity, List<ActivityEnroll>>的Keys，DataGrid 根据 ListBox 的选项不同而呈现不同的 List<ActivityEnroll>。

啊不好意思，我没问清楚问题。 我是想DataGrid呈现List<Activity>的数据。 但是我想通过每一个Activity得到的每一个List<ActivityEnroll>的Count都呈现进去。 也就是 名称 内容 时间 报名人数 参与人数 这样的5列。前3列是Activity的，后两列分别是List<ActivityEnroll>的Count和List<ActivityEnroll>中ActivityEnroll.statr==1的count

[Bonjour-你好]

<Window x:Class="MyTestWpf.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
       xmlns:local="clr-namespace:MyTestWpf"
        Title="MainWindow" Height="350" Width="525">

    <Window.Resources>
        <local:MyTestConverter x:Key="testConverter"/>
    </Window.Resources>

    <Grid>
        <DataGrid x:Name="dataGrid1" MinColumnWidth="80" AutoGenerateColumns="False" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Height="217" Width="425">
            <DataGrid.Columns>
                <DataGridTextColumn Header="名称" Binding="{Binding Key.Name}"/>
                <DataGridTextColumn Header="内容" Binding="{Binding Key.Content}"/>
                <DataGridTextColumn Header="时间" Binding="{Binding Key.Time,StringFormat='yyyy-MM-dd'}"/>
                <DataGridTextColumn Header="报名人数" Binding="{Binding Value.Count}"/>
                <DataGridTextColumn Header="参与人数" Binding="{Binding Value,Converter={StaticResource testConverter}}"/>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Data;
using System.Windows.Documents;

namespace MyTestWpf
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            DateTime time = DateTime.Now;
            Dictionary<Activity, List<ActivityEnroll>> source = new Dictionary<Activity, List<ActivityEnroll>>();

            Activity a1 = new Activity {
                Name = "名称  1",
                Content = "内容  1",
                Time = time.AddDays(-3)
            };
            List<ActivityEnroll> ae1 = new List<ActivityEnroll> {
                new ActivityEnroll { Statr=1},
                new ActivityEnroll { Statr=2},
                new ActivityEnroll { Statr=1},
                new ActivityEnroll { Statr=3},
                new ActivityEnroll { Statr=0}
            };
            source.Add(a1, ae1);

            Activity a2 = new Activity {
                Name = "名称  2",
                Content = "内容  2",
                Time = time.AddDays(-5)
            };
            List<ActivityEnroll> ae2 = new List<ActivityEnroll> {
                new ActivityEnroll { Statr=1},
                new ActivityEnroll { Statr=2},
                new ActivityEnroll { Statr=1},
                new ActivityEnroll { Statr=1}
            };
            source.Add(a2, ae2);

            var temp = source.ToList();
            this.dataGrid1.ItemsSource = temp;
        }
    }

    public class Activity
    {
        public String Name { get; set; }
        public String Content { get; set; }
        public DateTime Time { get; set; }
    }

    public class ActivityEnroll
    {
        public Int32 Statr { get; set; }
    }

    public class MyTestConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            List<ActivityEnroll> temp = value as List<ActivityEnroll>;
            if (temp != null) {
                return temp.Where(x => x.Statr == 1).ToList().Count;
            }

            return null;
        }

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