如何在uwp中对x:Double标签中的值使用绑定？

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

public class MyViewModel : INotifyPropertyChanged
{
    private double myValue;

    public double MyValue
    {
        get { return myValue; }
        set
        {
            if (myValue != value)
            {
                myValue = value;
                OnPropertyChanged();
            }
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

MyViewModel viewModel = new MyViewModel();
DataContext = viewModel;

<Page.DataContext>
    <local:MyViewModel />
</Page.DataContext>