c# - 获取 ObservableCollection 的父级

Question

我想通过仅从集合中推导它来引用包含 ObservableCollection 的对象。如何在 C# 中完成此操作？

例子

public class Order: INotifyPropertyChanged
{   

    public DateTime OrderDate {get; set;}  

    public ObservableCollection<Item> ItemsA {get; set;}

    public ObservableCollection<Item> ItemsB {get; set;}

    public ObservableCollection<Item> ItemsC {get; set;}

 } 

代码中的引用

private void ItemsChanged(ObservableCollection<Item> items)
{
    Order newOrder = items.Parent(); // <-- How can this be done?

    if (newOrder.OrderDate <= new DateTime (2016, 6, 30)
    {

    }
}

谢谢!

Answer 1

如何扩展 ObservableCollection？

public ChildObservableCollection<T> : ObservableCollection<T>
{
    private Order parent { get;set;}
}

用法:

public class Order: INotifyPropertyChanged
{   
    public Order()
    {
       ItemsA = new ChildOberservableCollection<Item>();
       ItemsA.parent = this;
       ...
    }

    public DateTime OrderDate {get; set;}  

    public ChildObservableCollection<Item> ItemsA {get; set;}

    public ChildObservableCollection<Item> ItemsB {get; set;}

    public ChildObservableCollection<Item> ItemsC {get; set;}

} 

代码中的引用:

private void ItemsChanged(ChildObservableCollection<Item> items)
{
    Order newOrder = items.parent; // done!

    if (newOrder.OrderDate <= new DateTime (2016, 6, 30)
    {

    }
}