Having trouble binding an Observable collection to my ListView in Xamarin Forms

Question

I am very new to Xamarin Forms and I am trying to bind my Observable collection "DisplayItems" to my listview, but I cannot figure out how to do that and be able to display the name to the item. I can get the make listview.ItemsSource = DisplayItems, but when I do I don't know how to make the label in the listview display to get the name of the Item. Any help would be appreciated.

    using System;
    using System.Collections.Generic;
    using System.Collections.ObjectModel;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.ComponentModel
    using Xamarin.Forms;
    using Xamarin.Forms.Xaml;


    namespace ShoppingList
    {
        [XamlCompilation(XamlCompilationOptions.Compile)]
        public partial class Page1 : ContentPage
        {

            public ObservableCollection<Item> DisplayItems;

            public Page1()
            {
                InitializeComponent();

                DisplayItems = new ObservableCollection<Item>();

                DisplayItems.Add(new Item("potato", 3.40, 3, false));
                DisplayItems.Add(new Item("juice", 4.70, 5, true));


                BindingContext = this;

            }


        }
    }

XAML:

    <?xml version="1.0" encoding="utf-8" ?>
    <ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
                 xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                 xmlns:d="http://xamarin.com/schemas/2014/forms/design"
                 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
                 mc:Ignorable="d"
                 x:Class="ShoppingList.Page1"
                 Title ="ViewPage">
        <ContentPage.Content>
            <StackLayout>

                <ListView x:Name="listview"  ItemsSource="{Binding DisplayItems}" HasUnevenRows="True" HorizontalOptions="Fill" VerticalOptions="Fill" >
                    <ListView.ItemTemplate>
                        <DataTemplate>
                            <ViewCell x:Name="viewcell">
                                <StackLayout>
                                    <Label x:Name="ListCell" Text="{Binding name}"/>
                                </StackLayout>
                            </ViewCell>
                        </DataTemplate>
                    </ListView.ItemTemplate>
                </ListView>


            </StackLayout>
        </ContentPage.Content>
    </ContentPage>

do you know the difference between a field and a property? The code you just posted and deleted was NOT a public property — Jason
Okay, I made them into public properties and now everything is working, thanks for the quick help :) — Billybo_O

Junior Jiang Junior Jiang · Accepted Answer · 2019-09-23T01:59:45

Having a look at this document about set model data for ListView. Data Binding in ListView.

You should define Item class as follow :

public class Item 
{
    public string name {get; set;}
}

Then in ContentPage add some data DisplayItems :

namespace ShoppingList
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class Page1 : ContentPage
    {

        public ObservableCollection<Item> DisplayItems;

        public Page1()
        {
            InitializeComponent();

            DisplayItems = new ObservableCollection<Item>();

            DisplayItems .Add(new Item{ name="Rob Finnerty"});
            DisplayItems .Add(new Item{ name="Bill Wrestler"});

            BindingContext = this;
        }

    }
}

Last in Xaml this can work:

<ListView x:Name="listview"  ItemsSource="{Binding DisplayItems}" HasUnevenRows="True" HorizontalOptions="Fill" VerticalOptions="Fill" >
      <ListView.ItemTemplate>
           <DataTemplate>
               <ViewCell x:Name="viewcell">
                    <StackLayout>
                           <Label x:Name="ListCell" Text="{Binding name}"/>
                    </StackLayout>
                </ViewCell>
           </DataTemplate>
      </ListView.ItemTemplate>
  </ListView>

Having trouble binding an Observable collection to my ListView in Xamarin Forms

1 Answers