如何獲取當前呈現UserControls在MainWindow作爲一個孩子？

Question

我是MVVM和MVVMLight Toolkit的新手。因此，我正在使用基於Uri進行導航的項目，該項目設置在以視圖形式公開的Frame上：x：Name。 這是我的代碼..

public virtual void SetFrame(Uri userControll, string FrameElementName) 
{ 
    var mainWindow = Application.Current.MainWindow; 
    var frame = mainWindow.FindName(FrameElementName) as Frame; 

    if (frame != null) 
    { 
      frame.Source = userControll; 
    } 
} 

，如果我們想要導航功能上下工夫當前呈現UserControll哪個是主窗口的孩子呢？我們必須執行哪些步驟？ 像

public virtual void SetFrame(Uri anotherUserControll, string FrameElementName) 
{ 
    var userControl= // what to do to get Currently rendered Usercontroll as child of MainWindow? 
    var frame = userControl.FindName(FrameElementName) as Frame; 

    if (frame != null) 
    { 
     frame.Source = anotherUserControll;  
    } 
} 

Answer 1

我鑄造Frame.Context爲用戶控件來得到當前渲染用戶控件解決了這個問題.. 這裏

public virtual void SetFrame(Uri anotherUserControll, string FrameElementName) 
    { 
     var mainFrame =(Frame)Application.Current.MainWindow.FindName("MainFrame"); 
     var userControll = mainFrame.Content as UserControl; 
     var frame = userControll.FindName(contentControll) as Frame; 
     if (frame != null) 
     { 
      frame.Source = anotherUserControll; 
     }   
    }