清除 NavigationService 中的 backstack

本文介绍了清除 NavigationService 中的 backstack的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

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我正在我的应用程序中浏览不同的页面.登录后，我从导航开始的位置进入主页.在导航过程中，当我进入主页时，我想通过按 BackKey 进入登录页面，但我只能导航到以前导航的页面.我可以覆盖 BackKeyPress 事件以导航到登录页面，但在 LoginPage 中，我应该再次覆盖 Backkeypress，否则在按下 backkey 时会出现登录页面和主页之间的循环.有没有办法清除导航历史记录?

I am navigating through different pages within my application. After I login, I come to home page from where the navigation starts. During navigation, when I come to homepage, I want to go to the login page by pressing BackKey but I can only navigate to previously navigated page. I could have overriden the BackKeyPress event to navigate to the Login Page but in LoginPage I should again override the Backkeypress otherwise there appears to be cycle between loginpage and homepage on backkey press. Is there anyway to clear the navigation history?

推荐答案

您可以使用 NavigationService.RemoveBackEntry:http://msdn.microsoft/en-us/library/system.windows.navigation.navigationservice.removebackentry%28v=VS.92%29.aspx

You can use NavigationService.RemoveBackEntry: http://msdn.microsoft/en-us/library/system.windows.navigation.navigationservice.removebackentry%28v=VS.92%29.aspx

例如，从堆栈中删除所有条目:

For instance, to remove all entries from the stack:

while (this.NavigationService.BackStack.Any())
{
   this.NavigationService.RemoveBackEntry();
}

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此外，如果您想在检查其 URI 后仅删除上一页:

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Also, if you want to remove only the previous page after checking its URI:

var previousPage = this.NavigationService.BackStack.FirstOrDefault();

if (previousPage != null && previousPage.Source.ToString().StartsWith("/MainPage.xaml"))
{
    this.NavigationService.RemoveBackEntry();
}

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