更改帧源 Wpf
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Change Frame Source Wpf
提问by Kuriyama Mirai
How can I possibly change the source of a frame from other page when I click a button in an active page.
当我单击活动页面中的按钮时，我怎么可能从其他页面更改框架的来源。
What I'm doing is In page1.xaml, I have a frame with a source displaying page2.xaml.Once I click a button in page2.xaml, I want to update the source of frame in page1.xaml to page3.xaml and the frame should display page3.xaml instead of page2.xaml.
我正在做的是在 page1.xaml 中，我有一个源显示 page2.xaml 的框架。一旦我单击 page2.xaml 中的按钮，我想将 page1.xaml 中的框架源更新为 page3.xaml 和框架应显示 page3.xaml 而不是 page2.xaml。
As of now, I tried using
截至目前，我尝试使用
page1 pg1 = new page1();
pg1.frame.source = new Uri("page3.xaml",UriKind.Relative);
But it didn't display page3.xaml in the frame in page1.xaml.
但是它没有在page1.xaml的frame中显示page3.xaml。
I also tried
我也试过
page1 pg1 = new page1();
pg1.frame.Navigate(new Uri("page3.xaml",UriKind.Relative));
but didn't work as well, page2.xaml remains the display of the frame.
但效果不佳，page2.xaml 仍然是框架的显示。
回答by Liero
First of all, it is unusual to have frame inside page. Usually you have frame inside MainWindow or Usercontrol, because Page is meant to be hosted inside frame.
首先，页面内有框架是不寻常的。通常您在 MainWindow 或 Usercontrol 中有框架，因为 Page 旨在托管在框架内。
Second, you can't just create new Page1and use it's frame. This newly created Page1 exist only in memory and it is another instance that the one displayed.
其次，您不能只是创建新的Page1并使用它的框架。这个新创建的 Page1 只存在于内存中，它是显示的另一个实例。
Because it would be quite difficult to find the Frame from pages, there is NavigationServiceproperty in Page class.
因为要从页面中找到 Frame 非常困难，所以Page 类中有NavigationService属性。
NavigationService.Navigate(new Uri("page3.xaml",UriKind.Relative));
