I am new to Xamarin... I have a problem when I want to show a description in a label. I have a listView with different items and when the user clicks in one item the app moves to a Tabbed Page with two main windows one for description and the other one for opinions. Here you have a diagram. photo

I pass the object from the item clicked to the Tabbed Page and from it I pass data to its children. Here is the code

---> Model

 public class Item
{
    public String name;
    public String description;
    public Double price;
    public int stock;
    public List<String> opinions;

    public Item(String name, String description ,Double price, int stock, List<String> opinions)
    {
        this.name = name;
        this.description = description;
        this.price = price;
        this.stock = stock;
        this.opinions = opinions;
    }
    public override string ToString()
    {
        return this.name   " "   this.price   " $"   this.stock   " ud";
    }
    
}

---> event handler to navigate to the TabPage once an item from listView is clicked.

private async void parent_listView_ItemSelected(object sender, SelectedItemChangedEventArgs e)
    {
        var item = (Item)e.SelectedItem;
        //await Navigation.PushAsync(new TabPage(new Datos(itemList[e.SelectedItemIndex] ), new Opinions(itemList[e.SelectedItemIndex] )));
        await Navigation.PushAsync(new TabPage(item));
    }

----> How I get the data to the TabPage and send to its children.

 public partial class TabPage : TabbedPage
{
    Item item;
    public TabPage(Item item)
    {
        InitializeComponent();
        this.item = item;
        inichildren(item);


    }

    private void inichildren(Item item)
    {
        
        Datos d = new Datos(item);
        Opinions o = new Opinions(item);
       
    }

}

---> Finally the Datos class where I am interested in.

 public Datos()
    {
        InitializeComponent();
        
        
        
    }

    public Datos(Item i)
    {
        InitializeComponent();

        
        
        lbl_description.Text = i.description.ToString();
        lbl_item_price.Text = i.price.ToString();
    }

Everything works fine and even I added some break point to see if I receive the data in Datos class and all labels variables seems to point to the right data. But the thing is that when I initialize the labels in the constructors no data appears on the screen.... I am new to Xamarin and don't have idea why this is happening. Many thanks for your help.

CodePudding user response：

if you want to pass data to the child pages via the constructor, you will need to setup the pages in code, not XAML.

private void inichildren(Item item)
{
    Datos d = new Datos(item);
    Opinions o = new Opinions(item);
   
    // since you are adding the child pages here, remove them from the TabbedPage XAML
    this.Children.Add(d);
    this.Children.Add(o);
}