C# 当ListView ItemSelected位于其他类文件中时，如何导航到其上的页面？

我无法在应用程序中导航页面。我是Xamarin形式的初学者。我正在做的是，我有一个名为Master.cs的主控详细信息页，默认情况下，它会导航到主页，即内容页。我已经在其他类页面（即ModelClasses.cs）中创建了列表视图，现在我想在选择listview项的同时导航到其他内容页面。我尝试了更多的东西，但没有成功。 救救我

母版页

public class master : MasterDetailPage
    {
        public master ()
        {
            Label header = new Label {
                Text = "Master",
                Font = Font.BoldSystemFontOfSize (20)
            };
            MenuStacklayout _MenuStacklayout = new MenuStacklayout ();
            this.Master = new ContentPage{ 
                Title=header.Text,
                Content=_MenuStacklayout
            };

            this.Detail = new NavigationPage(new FTWHome());

            // For Windows Phone, provide a way to get back to the master page.
            if (Device.OS == TargetPlatform.WinPhone)
            {
                (this.Detail as ContentPage).Content.GestureRecognizers.Add(
                    new TapGestureRecognizer((view) =>
                        {
                            this.IsPresented = true;
                        }));
            }
        }
    }

模型类

菜单堆栈布局创建菜单

    public class MenuStacklayout : StackLayout
        {
            String[] homelinks = { "HOME" };
            String[] healthlinks = { "I NEED HELP", "A MATE NEEDS HELP", "MOOD TRACKER", "HELPFUL ARTICLES" };
            String[] entertainmentlinks = { "PHOTO OF THE DAY", "MAGZINE CONTENTS", "FTW TEAM" };
            String[] aboutlinks = { "FTW PHILOSOPHY", "ABOUT FTW", "FTW STORE", "FTW SOCIAL" };
            String[] joinftwlinks = { "JOIN FTW" };
            String[] loginlinks = { "LOGIN" };

            #region Menu Layout
            public MenuStacklayout ()
            {
                ListView homelist = new ListView { 
                    ItemsSource = menuitems._menuitems (homelinks),
                    ItemTemplate = new DataTemplate (typeof(ftwMenuCell))
                };
                homelist.RowHeight = 30;
                homelist.ItemSelected+= navigatePage_onSelected;
                StackLayout homeliststack = new StackLayout ();
                homeliststack.Children.Add (homelist);
                homelist.SeparatorVisibility = SeparatorVisibility.None;

                //homeliststack.Padding = new Thickness (2, 5, 0, 0);
                ListView healthlist = new ListView { 
                    //Header = "HEALTH",
                    ItemsSource = menuitems._menuitems (healthlinks),
                    ItemTemplate = new DataTemplate (typeof(ftwMenuCell))
                };
                healthlist.RowHeight = 30;
                healthlist.ItemSelected+=navigatePage_onSelected;
                StackLayout healthliststack = new StackLayout ();
                healthliststack.Children.Add (healthlist);
                healthlist.SeparatorVisibility = SeparatorVisibility.None;

                ListView entertainmentlist = new ListView { 
                    //Header = "ENTERTAINMENT",
                    ItemsSource = menuitems._menuitems (entertainmentlinks),
                    ItemTemplate = new DataTemplate (typeof(ftwMenuCell))
                };
                entertainmentlist.RowHeight = 30;
                entertainmentlist.ItemSelected+=navigatePage_onSelected;
                StackLayout entertainmentliststack = new StackLayout ();
                entertainmentliststack.Children.Add (entertainmentlist);
                entertainmentlist.SeparatorVisibility = SeparatorVisibility.None;

                ListView aboutlist = new ListView { 
                    //Header = "ABOUT",
                    ItemsSource = menuitems._menuitems (aboutlinks),
                    ItemTemplate = new DataTemplate (typeof(ftwMenuCell))
                };
                aboutlist.RowHeight = 30;
                aboutlist.ItemSelected+=navigatePage_onSelected;
                StackLayout aboutliststack = new StackLayout ();
                aboutliststack.Children.Add (aboutlist);
                aboutlist.SeparatorVisibility = SeparatorVisibility.None;

                ListView joinftwlist = new ListView { 
                    ItemsSource = menuitems._menuitems (joinftwlinks),
                    ItemTemplate = new DataTemplate (typeof(ftwMenuCell))
                };
                joinftwlist.RowHeight = 30;
                StackLayout joinftwliststack = new StackLayout ();
                joinftwliststack.Children.Add (joinftwlist);
                joinftwlist.SeparatorVisibility = SeparatorVisibility.None;

                ListView loginlist = new ListView { 
                    ItemsSource = menuitems._menuitems (loginlinks),
                    ItemTemplate = new DataTemplate (typeof(ftwMenuCell))
                };
                loginlist.RowHeight = 30;
                loginlist.SeparatorVisibility = SeparatorVisibility.None;
                loginlist.BackgroundColor = Color.Blue;
                StackLayout loginstack = new StackLayout ();
                loginstack.Children.Add (loginlist);


                this.Spacing = 1;
                this.BackgroundColor = Color.FromHex("#cccccc");
                this.Padding = new Thickness (0, 65, 0, 0);
                this.Orientation = StackOrientation.Vertical;
                this.VerticalOptions = LayoutOptions.StartAndExpand;
                this.Children.Add (homeliststack);
                this.Children.Add (healthliststack);
                this.Children.Add (entertainmentliststack);
                this.Children.Add (aboutliststack);
                this.Children.Add (joinftwlist);
                this.Children.Add (loginstack);
            }
        }

菜单项模板

公共类ftwMenuCell:ViewCell
{
公共ftwMenuCell（）
{
var namelab=新标签（）{
FontFamily=“HelveticaNeue中等”，
FontSize=14，
FontAttributes=FontAttributes.Bold，
TextColor=Color.Black，
垂直选项=布局选项.Center
};
nameLabel.SetBinding（Label.TextProperty，“_链接”）；
var cellLayout=新堆栈布局{
间距=0，
填充=新厚度（10,0,0,0），
VerticalOptions=LayoutOptions.FillAndExpand，
方向=堆叠方向。水平，
子项={namelab}
};
this.View=cellLayout；
}
}
公共类
{
公共字符串_链接{get；set；}
}
公共静态类菜单项
{
公共静态列表\u菜单项（字符串[]linkid）
{
列表菜单列表=新列表（）；
foreach（linkid中的变量项）{
_menulink menulink=new_menulink（）；
菜单链接=项目；
menulinklist.Add（menulink）；
}
返回菜单列表；
}
}

每个Listview项目都有各自的内容页。 提前谢谢

我看不到您导航的位置声明了Page_onSelected，但您可以尝试以下操作

void navigatePage_onSelected(object sender, SelectedItemChangedEventArgs e) {
    Navigation.PushModalAsync(new PageName());
}

如果对你有效，请告诉我：）

我已经解决了

在MenuStacklayout类中声明的navigatePage_onSelected事件处理程序中，我放入了以下代码，它正在工作

void navigatePage_onSelected(object sender, SelectedItemChangedEventArgs args){
            _menulink menuitem = (_menulink)args.SelectedItem;
            MasterDetailPage mstr = (MasterDetailPage)(Application.Current.MainPage); // My Application main page is a Masterpage so..
            if (menuitem._link == "ABOUT FTW") {
                mstr.Detail = new NavigationPage (new AboutFTW ());
            }else if(menuitem._link == "I NEED HELP"){
                mstr.Detail = new NavigationPage (new Entertainment ());
            }else if(menuitem._link == "HOME"){
                mstr.Detail = new NavigationPage (new FTWHome ());
            }
            // Show the detail page.
            mstr.IsPresented = false;
        }

---

是的，没有给出，但它在我的解决方案中。我会尽力让你知道的。谢谢我一直在等谁给我一些想法。不工作，这是错误的说法。导航。PushModalAsync（new PageName（））；这似乎是一个很好的解决方案，尽管我有一点意见。NavigationPages通常用作转到其他页面的中心。我看不到你页面的代码，所以我可能是错的，但看起来这些是目标页面。如果是这种情况，您可能需要使用ContentPage。这其实没那么重要，但我想我应该提一下：）@I_Khanage是的，提到的导航页面是我的目标页面，我的其他东西都是在那里写的。

void navigatePage_onSelected(object sender, SelectedItemChangedEventArgs args){
            _menulink menuitem = (_menulink)args.SelectedItem;
            MasterDetailPage mstr = (MasterDetailPage)(Application.Current.MainPage); // My Application main page is a Masterpage so..
            if (menuitem._link == "ABOUT FTW") {
                mstr.Detail = new NavigationPage (new AboutFTW ());
            }else if(menuitem._link == "I NEED HELP"){
                mstr.Detail = new NavigationPage (new Entertainment ());
            }else if(menuitem._link == "HOME"){
                mstr.Detail = new NavigationPage (new FTWHome ());
            }
            // Show the detail page.
            mstr.IsPresented = false;
        }