将SelectedItem传递到DataTemplate内的UserControl的ViewModel

我有一个用prism编写的非常简单的mvvm代码:

• 2个模型(个人、公司-公共接口IContact),2个视图模型(prism)和2个视图(usercontrol)
• 1个视图模型(接口IContact的集合),其中1个视图(列表框绑定到集合,一个ContentControl绑定到列表框的SelectedItem,数据模板Selector根据SelectedItem的类型返回两个用户控件中的一个)

如何将模型对象(个人或公司)从列表框的SelectedItem(IContact)传递到与DataTemplateSelector返回的视图(个人视图或公司视图)匹配的两个视图模型之一?

谢谢您!

代码很多,但很简单:

我有这些模型类:

public interface IContact
{
    string Address { get; set; }
}

public class Person : IContact
{
    public string Address { get; set; }
}

public class Company : IContact
{
    public string Address { get; set; }
}

我有以下ViewModel类:

public class ContactViewModel : Prism.Mvvm.BindableBase
{
    private ObservableCollection<IContact> _contacts = new ObservableCollection<IContact>();
    public ObservableCollection<IContact> Contacts
    {
        get { return _contacts; }
        set { SetProperty(ref _contacts, value); }
    }
}

public class PersonViewModel : Prism.Mvvm.BindableBase
{
    private Person _person; // I want to set this from the ListBox's SelectedItem
    public Person Person
    {
        get { return _person; }
        set { SetProperty(ref _person, value); }
    }
}

public class CompanyViewModel : Prism.Mvvm.BindableBase
{
    private Company _company; // I want to set this from the ListBox's SelectedItem
    public Company Company
    {
        get { return _company; }
        set { SetProperty(ref _company, value); }
    }
}

我有这些视图类:

<UserControl x:Class="ContactView"
             xmlns:prism="http://prismlibrary.com/"
             prism:ViewModelLocator.AutoWireViewModel="True" >
    <UserControl.Resources>
        <DataTemplate x:Key="PersonDataTemplate">
            <local:PersonView>
                // How can I pass the SelectedItem to the ViewModel of this UserControl?
            </local:PersonView>
        </DataTemplate>
        <DataTemplate x:Key="CompanyDataTemplate">
            <local:CompanyView>
                // How can I pass the SelectedItem to the ViewModel of this UserControl?
            </local:CompanyView>
        </DataTemplate>
        <dataTemplateSelectors:contactDataTemplateSelector x:Key="templateSelector"
              PersonDataTemplate="{StaticResource PersonDataTemplate}" 
              CompanyDataTemplate="{StaticResource CompanyDataTemplate}"/>
    </UserControl.Resources>
    <Grid>
        // RowDefinitions here
        <ListBox ItemsSource="{Binding Contacts}" x:Name="myListBox">
            // ItemTemplate here
        </ListBox>
        <ContentControl Grid.Row="1" 
            Content="{Binding ElementName=myListBox, Path=SelectedItem}" 
            ContentTemplateSelector="{StaticResource templateSelector}" />
    </Grid>
</UserControl>

人:

<UserControl x:Class="PersonView"
             xmlns:prism="http://prismlibrary.com/"
             prism:ViewModelLocator.AutoWireViewModel="True" >
    <Grid>
        <TextBlock Text="{Binding Person.Address}" />
    </Grid>
</UserControl>

公司:

<UserControl x:Class="CompanyView"
             xmlns:prism="http://prismlibrary.com/"
             prism:ViewModelLocator.AutoWireViewModel="True" >
    <Grid>
        <TextBlock Text="{Binding Company.Address}" />
    </Grid>
</UserControl>

还有这个:

public class ContactDataTemplateSelector : DataTemplateSelector
{
    public DataTemplate PersonDataTemplate { get; set; }
    public DataTemplate CompanyDataTemplate { get; set; }

    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
        if (item is Person)
        {
            return PersonDataTemplate;
        }
        if (item is Company)
        {
            return CompanyDataTemplate;
        }
    }
}