DependentProperty被称为计算属性。在本例中，INotifyPropertyChanged.PropertyChanged事件通过调用SetProperty方法隐式引发。您所要做的就是显式引发计算属性的事件。
通常，您已经有了一个事件调用器方法实现，SetProperty方法也在内部使用它。
例如，如果使用.NET社区工具包，则已经继承了可以调用的protected virtual ObservableObject.OnPropertyChanged(propertyName: string):void方法。

private int _property;
public int Property
{
  get => _property;
  set
  {
    // Implicitly raises the PropertyChanged event for this property
    // because SetProperty is calling OnPropertyChanged (event invocator method) internally.
    SetProperty(ref _property, value, () => Property);

    // Raise the PropertyChanged event explicitly for the computed property
    OnPropertyChanged(nameof(DependentProperty));
  }
}

public int DependentProperty => Property + SomeLogic;

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当然，如果你想避免从计算属性所依赖的每个属性中显式引发PropertyChanged事件，你可以观察所需的属性：

private int _property;
public int Property
{
  get => _property;
  set => SetProperty(ref _property, value, () => Property);
}

public int DependentProperty => Property + SomeLogic;

public ViewModel()
{
  TrackDependentPropertySourceProperties();
}

private void TrackDependentPropertySourceProperties()
{
  this.PropertyChanged += OnDependentPropertySourcePropertiesChanged;
}

// Assume that DependentProperty depends on three other properties
// (use three to highlight the pattern)
private void OnDependentPropertySourcePropertiesChanged(object sender, PropertyChangedEventArgs e)
{
  switch (e.PropertyName)
  {
    case nameof(Property):
    case nameof(SomeOtherProperty):
    case nameof(AThirdProperty):
      OnPropertyChanged(nameof(DependentProperty));
  }
}

型

你需要实现INotifyPropertyChanged接口到模型。
然后实施

protected void OnPropertyChanged(string name)
{
     PropertyChangedEventHandler handler = PropertyChanged;
     if (handler != null)
     {
         handler(this, new PropertyChangedEventArgs(name));
     }
}

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当你set的时候，属性就调用OnPropertyChanged(<ProperyName>)。

建议：不要将业务逻辑放入模型本身。