Question

我有一个称为“强势”的视图模型,其中引用了“强势”的级别视图模式 < /强势” 。每个级别视图模型都代表了基本模型的等级。我的问题是,通知“强势”操作ViewModel

我试着听了家长的“强势”财产变更

我还尝试过通过父母作为孩子的参考,然后引用一种方法,然后在链子上援引父母的提法,但同样,这似乎也很糟糕。

class OperatingViewModel : INotifyPropertyChanged
{
   LevelAListViewModel LevelACollection { get; set; }
}

class LevelAListViewModel : INotifyPropertyChanged
{
   LevelAList _model;
   LevelBListViewModel LevelBListViewModel { get; set; }
}

class LevelAViewModel : INotifyPropertyChanged
{
   LevelB _model;
   LevelBListViewModel LevelBListViewModel { get; set; }
}

class LevelBListViewModel : INotifyPropertyChanged
{
   LevelBList _model;
   ObservableCollection<LevelBViewModel> LevelBCollection { get; set; }
}

class LevelBViewModel : INotifyPropertyChanged
{
   LevelB _model;
   LevelCListViewModel LevelCListViewModel { get; set; }
}

class LevelCListViewModel : INotifyPropertyChanged
{
   LevelCList _model;
   ObservableCollection<LevelCViewModel> LevelCCollection { get; set; }
}

class LevelCViewModel : INotifyPropertyChanged
{
   LevelC _model;
   LevelDListViewModel LevelDListViewModel { get; set; }

   DateTime StartDate
   { 
       get { return _model.StartDate } 
       set 
       { 
           _model.StartDate = value; 
           OnPropertyChanged("StartDate"); 
       } 
   }

   DateTime EndDate 
   { 
       get { return _model.EndDate } 
       set 
       { 
           _model.EndDate = value;
           OnPropertyChanged("EndDate"); 
       } 
   }
}

class LevelDListViewModel : INotifyPropertyChanged
{
   LevelD _model;
   ObservableCollection<LevelDViewModel> LevelDCollection { get; set; }
}

class LevelDViewModel : INotifyPropertyChanged
{
   LevelD _model;    
   int Price
   { 
       get { return _model.Price} 
       set 
       { 
           _model.Price = value; 
           OnPropertyChanged("Price"); 
       } 
   }
}

Answer 1

最常用的四种方式是:

Listening to the child s PropertyChanged event
Passing a reference to a parent, and then invoking a method on the parent
Passing a lambda to the children which invokes a method on the parent
Using a loosely-coupled EventAggregator to publish a PropertyChanged event in the child, to which the parent subscribes. See Prism s EventAggregator for an example.

我通常会选择1或3, 始终铭记两者都可能造成内存漏漏,

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