具有MVVM和依赖项属性的WPF用户控件地狱 [英] WPF User Control hell with MVVM and Dependency Properties

问题描述

这就是我想要做的:

• 我正在写一个我想被其他开发人员使用的UserControl.

• 我希望最终用户能够通过依赖项属性"使用我的控件.

• I'm writing a UserControl that I want to be consumed by other developers.

• I want end users to be able to use my control using Dependency Properties.

<lib:ControlView ControlsText={Binding Path=UsersOwnViewModelText} />

我正在使用MVVM模式.

I'm using the MVVM pattern.

我正在使用<DataTemplates>

<DataTemplate DataType="{x:Type local:ControlViewModel}">  
    <local:ControlView />  
</DataTemplate>

所以我有两个问题:

1. 我是在想，如果在XAML中使用了UserControl，则当控件的Loaded事件触发时，UserControl必须将ViewModel设置为其DataContext，而不是使用<DataTemplate>方法?

1. Am I right in thinking that if a UserControl is being consumed in XAML then the UserControl must set the ViewModel as its DataContext when the control's Loaded event fires instead of using the <DataTemplate> method?

如何允许用户将数据绑定到控件的依赖项属性，同时仍将数据绑定到ViewModel?

How do I allow users to data bind to my control's dependency properties while still being data bound to my ViewModel?

推荐答案

首先，如果您正在开发将由其他用户使用的UserControl，我认为MVVM不是一个不错的选择.一个无表情的控件是您真正应该开发的.耶利米·莫里尔(Jeremiah Morrill)具有

First off, I don't think MVVM is a good choice if you are developing a UserControl that will be consumed by others. A lookless control is what you really should be developing. Jeremiah Morrill has a blog post about this subject.

话虽如此，如果您具有默认的公共构造函数，则可以使用XAML设置数据上下文.

With that said, you can set the datacontext with XAML if you have a default public constructor.

在ControlView.xaml内部放置:

Inside ControlView.xaml put:

<UserControl.DataContext>
    <local:ControlViewModel />
</UserControl.DataContext>

这篇关于具有MVVM和依赖项属性的WPF用户控件地狱的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！