从的PhoneApplicationPage的子类继承的代码隐藏类 [英] Inheriting code-behind class from PhoneApplicationPage's subclass

问题描述

在默认情况下所有的代码隐藏类从的PhoneApplicationPage 继承。我想作的PhoneApplicationPage 的子类，并用它作为基础，我的代码隐藏类，像这样：

By default all code-behind classes inherit from PhoneApplicationPage. I would like to make a subclass of PhoneApplicationPage and use it as basis for my code-behind class, like so:

namespace Test
{
    public partial class HistoryRemoverPage : PhoneApplicationPage
    {
        protected override void OnNavigatedTo
            (NavigationEventArgs e)
        {
            if (e.NavigationMode == NavigationMode.New)
                NavigationService.RemoveBackEntry();
        }
    }
}

namespace Test
{
    public partial class MainPage : HistoryRemoverPage 
    {
        public MainPage()
        {
            InitializeComponent();
        }
    }
}

当我尝试编译我的应用程序，我得到以下错误：

When I try to compile my application I get the following error:

错误Test.MainPage1分部声明不能指定
不同的基类

Error 1 Partial declarations of 'Test.MainPage' must not specify different base classes

我相信这与按照 MainPage.xaml中这点声明做到的PhoneApplicationPage ，而不是我的子类：

I believe this has to do with following declaration in MainPage.xaml that points to PhoneApplicationPage instead of my subclass:

电话：的PhoneApplicationPage ...

phone:PhoneApplicationPage ...

但我不知道如何解决这个问题。有什么建议？

But I don't understand how to fix this. Any advice?

推荐答案

是的，你是在正确的轨道上。你需要在你的 MainPage.xaml中来改变根元素，以自定义的基类：

Yes you are on the right track. You need to change the root element in your MainPage.xaml to your custom base class:

<test:HistoryRemoverPage x:Class="Test.MainPage"                   
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    <!-- ... ---> 
    xmlns:test="clr-namespace:Test">

         <!--LayoutRoot is the root grid where all page content is placed-->
         <Grid x:Name="LayoutRoot" Background="Transparent">
              <!-- ... --->
         </Gird>    

</test:HistoryRemoverPage>

请注意你需要添加你的基类的命名空间（的xmlns：测试）。

Note you need add your base class namespace (xmlns:test) in order to specify your base class in XAML.

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