ViewModel是否应该继承WPF中的DependencyObject？ [英] Should ViewModel inherit DependencyObject in WPF?

问题描述

我试图使用MVVM在WPF中创建一个简单的 UserControl 。现在，我需要为 UserControl 创建一个依赖项属性，因此我尝试在 UserControlViewModel 中创建依赖项属性（我

I tried to create a simple UserControl in WPF using MVVM. Now I need to create a dependency property for the UserControl, so I tried to create the dependency property in UserControlViewModel (I don't want to be in code-behind).

为了在 UserControlViewModel 中创建依赖项属性，需要从 DependencyObject 继承。在 UserControlViewModel 中继承 DependencyObject 是一个好习惯吗？也就是说，遵循MVVM来设计 UserControl 的好方法吗？

In order to create a dependency property in UserControlViewModel I need to inherit from DependencyObject. Is it a good practice to inherit DependencyObject in UserControlViewModel? That is, is it a good way to follow MVVM for designing a UserControl?

推荐答案

如果您创建的自定义控件的属性要可绑定（例如以下代码），则不能使用 INotifyPropertyChanged ，并且您必须使用 DependencyObject 。

If you have created a custom control with properties that you want them to be bindable (e.g. the following code), you cannot use INotifyPropertyChanged and you must use a DependencyObject.

<MyUserControl MyDependencyProperty="{Binding PropertyPath}"  />

但是当使用 DependencyObjects 时，请注意：

But when using DependencyObjects you should keep in mind that:

1. DependencyObjects 未标记为可序列化。


2. DependencyObject 类会覆盖并密封 Equals（）和
   GetHashCode（）方法。



3. A DependencyObject 具有线程相似性-
   只能在创建它的线程上访问。

1. DependencyObjects are not marked as serializable.
2. The DependencyObject class overrides and seals both the Equals() and GetHashCode() methods.

3. A DependencyObject has thread affinity - it can only be accessed on the thread on which it was created.

• 查看讨论在View-Model中实现INPC和DP的良好MVVM示例，请参见此文章。

有关INPC与DP辩论的更多信息，请阅读此博客。

For more on the INPC vs DP debate, read this blog.

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