WPF使用HierarchicalDataTemplate绑定Dictionary生成TreeView

Dictionary<string, CustomeType>中的CustomeType是一个集合，将其绑定生成一棵树，树的第一层节点是Dictionary的Key，第二层是CustomeType集合，所有代码用XAML实现。
代码如下：

<TreeView Name="dictree" ItemsSource="{Binding}">

    <TreeView.Resources>

        <HierarchicalDataTemplate ItemsSource="{Binding Value}" DataType="{x:Type local:Job}">

            <TextBlock Text="{Binding Id}"><TextBlock Text="{Binding Name}"></TextBlock></TextBlock>

        </HierarchicalDataTemplate>

    </TreeView.Resources>

    <TreeView.ItemTemplate>

        <HierarchicalDataTemplate ItemsSource="{Binding Value}">

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

            <HierarchicalDataTemplate.ItemTemplate>

                <DataTemplate>

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

                </DataTemplate>

            </HierarchicalDataTemplate.ItemTemplate>

        </HierarchicalDataTemplate>

    </TreeView.ItemTemplate>

</TreeView>

Jobs jobs1 = new Jobs();

jobs1.Add(new Job() { Id = 1, Name = "CEO1"});

jobs1.Add(new Job() { Id = 2, Name = "CEO2"});

jobs1.Add(new Job() { Id = 3, Name = "CEO3"});

Jobs jobs2 = new Jobs();

jobs2.Add(new Job() { Id = 1, Name = "CEO1"});

jobs2.Add(new Job() { Id = 2, Name = "CEO2"});

jobs2.Add(new Job() { Id = 3, Name = "CEO3"});

Dictionary<string, Jobs> allJob = new Dictionary<string, Jobs>();

allJob.Add("CEO one", jobs1);

allJob.Add("CEO two", jobs2);

dictree.DataContext = allJob;

public class Job

{

    public int Id

    { get; set; }

    public string Name

    { get; set; }

    public string Status

    { get; set; }

}

public class Jobs : System.Collections.ObjectModel.ObservableCollection<Job> { }