在MVC中，什么是视图模型？ [英] In MVC, what is a ViewModel?

问题描述

我是正确的思维，它几乎像一个视图？

Am I right in thinking it's almost like a wrapper for all the objects necessary for a View?

举例来说，假设你有一个在线商店的销量音乐和DVD。在您浏览网页你想显示你所有的DVD和音乐列表。你会因此构建具有视图模型对象，包含专辑列表和DVD的名单？两个属性。

For example, say you had an online store that sold music and dvds. On your browse page you'd want to display a list of all your dvds and music. Would you therefore construct a ViewModel object that has two properties containing an albums list and a dvds list?

从我的理解看来，你有你的所有模型类IE浏览器。一个专辑/ DVD类，而只是单纯路过这些是不够的视图。难道一个视图模型基本上充当所有数据的视图需要一个载体？

From my understanding it seems that you have all your model classes ie. an Album/Dvd class, but simply passing these alone wouldn't be enough for your View. Does a ViewModel basically act as a carrier for all the data your View requires?

推荐答案

你的理解是正确的大部分，但它不是完整的。

Your understanding is mostly correct, but it's not complete.

该视图模型也可以执行从你的模型进行到View可以方便地与工作的数据类型的数据类型转换;这甚至可能意味着视图模型不直接携带模式但携带（可能的子集）在一个更合适的格式相同的信息的其他船只

The ViewModel may also perform conversions from the type of data that your Model carries to the type of data your View can conveniently work with; this might even mean that the ViewModel does not carry Models directly but other vessels that carry (possibly a subset of) the same information in a more suitable format.

考虑，你可以有一个聚集专辑和DVD的图书馆模式 - 这种模式之间的差异，相应的视图模型为precisely该型号不关心（甚至知道），而查看视图模型有利于它的前preSS目的。

Consider that you could have a Library model that aggregates Albums and DVDs -- the difference between such a model and the corresponding ViewModel is precisely that the Model doesn't care (or even know about) the View while the ViewModel has the express purpose of facilitating it.

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