c# – 使用viewmodel绑定usercontrol的依赖属性

本质上,我有一个主窗口,其上有一个用户控件,包含一个绑定到主窗口视图模型的属性.这个想法是当属性在用户表单中发生变化时,通过绑定主窗口视图模型中的属性也会发生变化.问题是,当用户控件没有ViewModel时,这是有效的,当我向用户控件添加一个简单的ViewModel时,绑定不再起作用.因为我需要为我的控件设置ViewModel,所以我需要弄清楚为什么添加ViewModel会破坏绑定以及如何修复它.欢迎任何建议.

public partial class Control1 : UserControl,INotifyPropertyChanged
{
   public Control1()
    {
        InitializeComponent();
        Loaded += Control1_Loaded;
    }

    void Control1_Loaded(object sender,RoutedEventArgs e)
    {
        DataContext = new Control1ViewModel();
    }

    public static DependencyProperty SavedStringProperty = DependencyProperty.Register(
       "SavedString",typeof(string),typeof(Control1));
    public string SavedString
    {
        get
        {
            return (string)GetValue(SavedStringProperty);
        }
        set
        {
            SetValue(SavedStringProperty,value);
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;


    private void FirePropChanged(string property)
    {
        if (PropertyChanged != null)
            PropertyChanged(this,new PropertyChangedEventArgs(property));
    }

    private void Button_Click_1(object sender,RoutedEventArgs e)
    {
         SavedString = "Hi";
    }   
}

public class MainWindowViewModel : INotifyPropertyChanged
{
    private string _message = "Hi";
    public string myMessage
    {
        get
        {
          return _message;  
        }
        set
        {
            _message = value;
            FirePropChanged("myMessage");
        }
    }
    public event PropertyChangedEventHandler PropertyChanged;

    private void FirePropChanged(string property)
    {
        if (PropertyChanged != null)
            PropertyChanged(this,new PropertyChangedEventArgs(property));
    }



    private string _savedString;
    public string SavedString
    {
        get
        {
            return _savedString;
        }
        set
        {
            _savedString = value;
            FirePropChanged("SavedString");
        }
    }
}

xaml(在MainWindow中)：

<myCtrl:Control1 SavedString="{Binding Path=SavedString,Mode=TwoWay}"/>

cs(我的uc viewmode)：

public class Control1ViewModel : INotifyPropertyChanged
 {
      public event PropertyChangedEventHandler PropertyChanged;       
 }

<myCtrl:Control1 SavedString="{Binding RelativeSource={RelativeSource 
    AncestorType=Window} Path=DataContext.SavedString,Mode=TwoWay}"/>