C# WPF 测试基类接受派生类实例再用基类赋值个 DataContext 绑定能找到派生类元素

ViewModel：

测试：这样子赋值是没问题,绑定能找到派生类元素：

public MainWindow()
{
    InitializeComponent();
    Myc myc = new VMMainWindow();
    DataContext = myc;
}

CS:

public class VMMainWindow : Myc, INotifyPropertyChanged
{
    public VMMainWindow()
    {
        Name = "令狐冲";
        Age = 25;
    }
    private string m_Name;
    public string Name
    {
        get { return m_Name; }
        set
        {
            m_Name = value;
            RaisePropertyChanged(nameof(Name));
        }
    }

    private int m_Age;

    public event PropertyChangedEventHandler PropertyChanged;

    public int Age
    {
        get { return m_Age; }
        set
        {
            m_Age = value;
            RaisePropertyChanged(nameof(Age));
        }
    }

    protected void RaisePropertyChanged(string name)
    {
        PropertyChanged?.Invoke(this, new System.ComponentModel.PropertyChangedEventArgs(name));
    }
}

public class Myc
{

}