Question

我有这段代码

public App()
    {
       ... 

        MainPage = new NavigationPage(content);
        App.Navigation.PushAsync(new homePage());
    }

PushAsync不起作用，它表示导航未定义，因此我可以向编译器证明导航已定义

Answer 1

Looks to me like the compiler is right. Your App won't have a Navigation property. What you probably need is:

MainPage.Navigation.PushAsync(new homePage());

Answer 2

另外

Application.Current.MainPage.Navigation.PushAsync(new homePage());

Answer 3

我的App（）设置如下：

public App()
{
    InitializeComponent();
    MainPage = new NavigationPage(new MasterDetail());
}

我的MasterDetail看起来像这样：

<?xml version="1.0" encoding="utf-8" ?>
<MasterDetailPage xmlns="http://xamarin.com/schemas/2014/forms"
         xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
         x:Class="GrowersClassified.Views.Menu.MasterDetail"
         xmlns:detail="clr-namespace:GrowersClassified"
         xmlns:master="clr-namespace:GrowersClassified.Views.Menu"
         Title="">
<MasterDetailPage.Master>
    <master:MasterPage x:Name="masterpage"/>
</MasterDetailPage.Master>
<MasterDetailPage.Detail>
    <NavigationPage>
        <x:Arguments>
            <detail:Index/>
        </x:Arguments>
    </NavigationPage>
</MasterDetailPage.Detail>

我认为您的问题可能是使用App. Navigation.PushAsync（new homePage（））; 对我来说，无论何时我试图使用它都会出错。

Xamarin导航PushAsync无法正常工作

3 个答案: