CodeGo.net>如何访问按钮单击Xamarin.Forms中的列表视图数据模板内部？

我有具有两个视图的动态视图,该视图动态地处理了标签和按钮,并且我试图访问按钮单击以转到按钮单击的详细信息页面.

以下是我自定义的ViewCell

protected override async void OnAppearing()
{
    listClass.ItemsSource = list;
    listClass.ItemTemplate = new DataTemplate(typeof(ItemTemplateViewCell )); 
}

public class ItemTemplateViewCell : ViewCell
{

    Label NameLbl = new Label();
    StackLayout sLayout = new StackLayout ();
    Button btnViewcell = new Button {Text = "Show class details"};
    public ItemTemplateViewCell()
    {
        NameLbl.SetBinding(Label.TextProperty, "Name");
        sLayout.Children.Add(NameLbl);
        btnViewcell.Clicked += (s, e) =>
        {
            // Navigation.PushAsync(new Home()); //I can not using this line 
            // does not exist in the current context, why cant i navigate to 
            // another page from inside datatemplate in List view
        };
        sLayout.Children.Add(btnViewcell);
        this.View = sLayout;
    }
}

解决方法:

您可以通过构造函数将Navication传递给ViewCell：

    public class ItemTemplateViewCell : ViewCell
    {
        // Navigation Mermber
        INavigation MyNavigation;
        Label NameLbl = new Label();
        StackLayout sLayout = new StackLayout ();
        Button btnViewcell = new Button {Text = "Show class details"};
        public ItemTemplateViewCell(INavigation navigation)
        {
            MyNavigation = navigation;
            NameLbl.SetBinding(Label.TextProperty, "Name");
            sLayout.Children.Add(NameLbl);
            btnViewcell.Clicked += ButtonShowDetails_Clicked;
            sLayout.Children.Add(btnViewcell);
            this.View = sLayout;
        }

        private void ButtonShowDetails_Clicked(object sender, EventArgs e)
        {                                                  
             MyNavigation.PushAsync(new Home());
        }
    }

然后通过代理函数传递导航

    protected override async void OnAppearing()
    {
       listClass.ItemsSource = list;
       listClass.ItemTemplate = new DataTemplate(Function) ; 
    }

    public object Function()
    {
        return new ItemTemplateViewCell (Navigation);
    }

然后,您可以在ViewCell中访问Navigation对象

标签：xamarin-forms,cross-platform,portable-class-library,c
来源： https://codeday.me/bug/20191025/1930608.html