有关视图模型管理问题（DesignTime VS运行时间） [英] Question about ViewModel Management (DesignTime Vs Run Time)

问题描述

我有一个很基本的WPF UI，从而用户请求会导致一个新的标签在我的TabControl打开。在的TabControl绑定到的ObservableCollection< ViewModelBase>

I have a fairly basic WPF UI whereby user requests cause a new tab to open in my TabControl. The TabControl is bound to an ObservableCollection<ViewModelBase>

我添加视图模型实例此集合，并相应的选项卡的内容显示基于模板是这样的：

I add ViewModel instances to this collection, and the corresponding tab's content is displayed based on templates like this:

    <DataTemplate DataType="{x:Type viewModels:UserUploadsViewModel}">
        <userControls:UserUploads />
    </DataTemplate>

现在让我们假设UserUploads控制，这里面我想在XAML线了一个虚拟机用设计帮助，像这样的：

Now let's say that inside of the UserUploads control I'd like to wire up a VM in XAML to help with the designing, like this:

<UserControl x:Class=".....UserUploads"
   .....
    DataContext="{Binding Source={StaticResource ViewModelLocater},
                  Path=UserAdministrationViewModel}">

这属性将在运行时返回一个VM提供现场服务和虚拟机在设计时模拟数据

This property will return a VM with live services at runtime, and a VM with mock data at design time.

问：这会不会XAML干扰了我在做什么了的TabItems内容绑定到视图模型的实例，并依托上述的DataTemplate使这种权利观？如果是这样，有没有办法让这两个概念一起工作？

Question: Will this XAML interfere with what I'm doing in binding a TabItems content to a ViewModel instance, and relying on the dataTemplate above to render the right View? If so, is there a way to get both of these concepts to work together?

推荐答案

还有就是要做到这一点更简单的方法。有DesignTimeUserAdministrationViewModel并在构造函数与静态数据填充它，然后指在用户控件为：

There is an easier way to do this. Have a DesignTimeUserAdministrationViewModel and populate it with static data in the constructor and refer that in UserControl as:

<UserControl d:DataContext="{d:DesignInstance designTimeVMs:DesignTimeUserAdministrationViewModel, IsDesignTimeCreatable=True}">

这种方式你必然会设计时的测试数据D：的DataContext 和运行时绑定到实际的实时数据的DataContext 。更多细节这里。

This way you have a design time test data bound to d:DataContext and runtime live data bound to the actual DataContext. More details here.

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