如何继承DataContext？

Question

请注意，我使用特定于WPF的F＃。在任何深度设置DataContext的子控件应该怎么做？特别是如何设置数据上下文以控制名称“TargetControl”。问题背景：

的App.xaml：

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     > 
    <Frame Name="Frame" Source="MainWindow.xaml" /> 
</Window> 

MainWindow.xaml：

<UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> 
    <Grid> 
     <TabControl Grid.Row="0" Grid.Column="0" Name="mainTab"> 
      <!-- Tests work area --> 
      <TabItem Header="Проверка проекта"> 
       <Frame Source="TestsPropagate.xaml" /> 
      </TabItem> 
     </TabControl> 
    </Grid> 
</UserControl> 

TestsPropagate.xaml

<UserControl 
    Name="TargetControl" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> 
    <TextBox Text="{Binding Path=testField}" /> 
</UserControl> 

我的引导程序来启动这个上限：

[<STAThread>] 
[<EntryPoint>] 
let main(_) = //(new Application()).Run(Application.Current) //mainWindowViewModel) 
    OFTD.DOM.ExtraEntities.Verification.EnitiesInitializer.InitializeReaders() 
    let app = new Application() 
    let view = Application.LoadComponent(new System.Uri("App.xaml", UriKind.Relative)) :?> Window 

    let vm = new AppViewModel() // is data context to TargetControl  
    app.Run(view) 

Answer 1

不超肯定的fsharp语法，但是这应该是有意义：

let vm = new AppViewModel() // is data context to TargetControl  
view.DataContext <- vm 
app.Run(view)