将依赖属性传递给子视图 [英] Pass dependency property to child view

问题描述

我正在wpf中创建一个用户控件，其中包含用户点击的多个屏幕。

I am currently creating a usercontrol in wpf which consists of several 'screens' that the user will click through.

我正在尝试以相对不错的方式MVVM方式，但是传递属性到每个视图有点麻烦。

I am trying to do this in a relatively nice MVVM way but am having a bit of trouble passing properties to each view.

对于每个屏幕，我已经创建了一个视图，它具有自己的viewmodel（例如View1.xaml， View2.xaml）。主要的用户控件可以访问这些视图：

For each 'screen' I have created a view with it's own viewmodel (e.g. View1.xaml, View2.xaml). The main usercontrol can then access these views:

<UserControl.Resources>
    <local:ModuleBaseViewModel x:Key="ViewModelDataSource" />
</UserControl.Resources>

<Grid x:Name="LayoutRoot" DataContext="{Binding Source={StaticResource ViewModelDataSource}}">
<Grid Background="#FF054549">
    <local:View1 Visibility="Visible"/>
    <local:View2 Visibility="Hidden"/>
    </Grid>
</Grid>

现在，我有一些属性，我想在每个视图之间共享（例如背景颜色） 。如果我把这个属性放在主用户控件viewmodel中，那么它被忽略，因为每个视图的DataContext被设置为它自己的viewmodel。

Now, I have some properties that I would like to share between each view (for example background color). If I put this property in the main usercontrol viewmodel then it gets ignored because each view has it's DataContext set to it's own viewmodel.

有没有办法传递属性到每个视图模型，而不必复制它？或者我完全错了吗？

Is there a way of passing down the property to each of the viewmodels without having to duplicate it? Or am I doing it completely wrong?

谢谢！

推荐答案

有一种方法可以解决这个问题。

There are multiple ways you can achive this.

一个解决方案可能是View1，View2等的ViewModels具有包含相同对象并与其绑定的CommonViewModel属性。 / p>

One solution could be that the ViewModels for View1, View2 etc has a CommonViewModel property containing the same object and binding to it.

<Grid Backround={Binding CommonSettings.Background} />

另一种方法是使用相对绑定并绑定到包含视图的研磨的数据文本。 p>

Another way is to use relative binding and bind to the datacontext of the grind containing the views.

<Usercontrol ...>
   <Grid Backround={Binding DataContext.Background, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Grid}} />
</UserControl>

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