在 WPF 中设置子 UserControl 的数据上下文
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Set datacontext of child UserControl in WPF
提问by Masood Alam
I am not able to set the datacontext of the UserControl (the UserControl is nested within other UserControl).
我无法设置 UserControl 的数据上下文（UserControl 嵌套在其他 UserControl 中）。
I have the below structure:
我有以下结构：
Views/ViewModels:
视图/视图模型：
MainControl <-> MainViewModel <br>
UserControlA <-> ViewModelA<br>
UserControlB <-> ViewModelB<br><br>
ViewModels:<br>
ViewModelBis a property of ViewModelAMainViewModel instantiates ViewModelAand ViewModelBin the ctor.
ViewModelB是ViewModelAMainViewModel 实例化的一个属性，ViewModelA并且ViewModelB在ctor.
Views:MainControlcontains UserControlA, which in turn contains UserControlBMainControlassigns the ViewModelAas the datacontext ( This works as expected )
视图：MainControlcontains UserControlA，它依次包含UserControlBMainControl将 分配ViewModelA为数据上下文（这按预期工作）
<!-- MainControl Xaml-->
<UserControl x:Name="MainControl">
<views:UserControlA DataContext="{Binding ViewModelA}" />
</UserControl>
In UserControlAi doing the same thing as in the MainControl, binding the datacontext
of UserControlBto its ViewModelwhich is a property in the ViewModelAThis is not working as expected...
在UserControlA我做与在相同的事情中MainControl，将数据上下文绑定UserControlB到它ViewModel的属性，ViewModelA这是不按预期工作...
<!-- USerControlA Xaml-->
<UserControl>
.....
.....
<views:UserControlB DataContext="{Binding DataContext.ViewModelB}" />
</UserControl>
回答by Stuart
Change the datacontext binding for UserControlB to:
将 UserControlB 的数据上下文绑定更改为：
<UserControl>
<views:UserControlB DataContext="{Binding ViewModelB}" />
</UserControl>
