wpf 如何访问框架内的页面内容？
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How can I access a page's content inside a frame?
提问by Fehu
I have a frame inside mainwindow, inside it there's a page with panels and various contents. The mainwindow decides wich page to load, and then must interact with their contents (here is the problem).
我在主窗口中有一个框架，里面有一个带有面板和各种内容的页面。主窗口决定加载哪个页面，然后必须与其内容交互（这是问题所在）。
I've tried many solution and the best is this, but returns pageLogin as a null object
我已经尝试了很多解决方案，最好的是这个，但是将 pageLogin 作为空对象返回
_mainFrame.Source = new Uri(@"/Pages/Login.xaml", UriKind.Relative);
Page pageLogin = this._mainFrame.Content as Page;
where _mainFrame is of course the name of the frame inside t mainwindow, and Login.xaml is the content with the Login_panel Stackpanel inside
其中_mainFrame当然是t mainwindow里面的frame的名字，Login.xaml就是里面有Login_panel Stackpanel的内容
回答by Rhyous
OK. So first, I think you might be going about this the wrong way to start. Check out this project. http://www.wpfsharp.com/2011/04/05/navigation-and-pages-using-model-view-viewmodel-mvvm/
好的。所以首先，我认为你可能会以错误的方式开始。看看这个项目。 http://www.wpfsharp.com/2011/04/05/navigation-and-pages-using-model-view-viewmodel-mvvm/
Try this example:
试试这个例子：
MainWindow.xaml
主窗口.xaml
<Window x:Class="Test.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"
Loaded="Window_Loaded"
>
<Grid>
<Frame Name="MainFrame" Source="/Login.xaml"></Frame>
</Grid>
</Window>
MainWindow.xaml.cs
主窗口.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
namespace Test
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
var a = MainFrame.Content as Page;
var grid = a.Content as Grid;
var textBlock = grid.Children[0];
// bla bla, you logged in
MainFrame.Source = new Uri("/Home.xaml", UriKind.Relative);
var b = MainFrame.Content as Page; // Still Login.xaml
MainFrame.ContentRendered +=MainFrame_ContentRendered;
}
private void MainFrame_ContentRendered(object sender, EventArgs e)
{
var b = MainFrame.Content as Page; // Is now Home.xaml
}
}
}
Login.xaml
登录.xaml
<Page x:Class="Test.Login"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300"
Title="Login">
<Grid>
<TextBlock>This is a sample login page.</TextBlock>
</Grid>
</Page>
