将集合绑定到具有不同类型的另一个集合 [英] Binding Collection to another Collection with different type

问题描述

好吧，我需要一些帮助来将一个集合绑定到另一个具有不同类型的集合

我有一个数据类(一个类，仅带有带有notifypropertychange的public get/set属性)
/>我有一个存储此数据对象的主集合
我有另一个集合(简称为集合A)，但是此集合是数据类内部属性的集合

我可以将收藏夹A绑定到主收藏夹吗? master集合将用于重新排序和修改数据类的属性.

我是否使用转换器来做到这一点?还是还有其他内容?

问候

ok, i need some help on binding a collection to another collection with different type

i have a data class(a class with just public get/set properties with notifypropertychange)
i have a master collection that stores this data object
i have another collection(lets call it collection A), however this collection is a collection of a property inside the data class

how can i bind collection A to the master collection. the master collection will be used for reordering and modifying the data classes' properties.

do i use a converter to do that? or is there something else?

Regards

推荐答案

如果我理解你对吧，您要在集合A中列出的是某个属性对主集合中的任何对象具有的所有值的列表，对吧?

好吧，由于数据对象实现了INotifyPropertyChanged，因此您可以注册一个处理程序，只要您将一个项目添加到主集合中，就可以在每次添加，删除或所讨论的属性更改其值时更新集合A.但是，为了知道何时删除一个值，您要么必须检查master集合中的所有项目(尽管可以通过LINQ非常优雅地做到这一点)，否则，如果这样做效率低下，则必须为每个告诉您何时可以将其从集合A中删除的值实现一个引用计数器.

Hi,

if I understand you right, what you want in Collection A is a list of all the values a certain property has on any object in your master collection, right?

Well, since the data objects implement INotifyPropertyChanged, you could register a handler for that whenever you add an item to the master collection, and update collection A whenever an item is added, removed, or the property in question changes its value. However, in order to know when to remove a value, you'd either have to check all items in the master collection (could do that through LINQ quite elegantly, though), or, if that is to inefficient, you'd have to implement a reference counter for each value that tells you when you can remove it from collection A.

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