Bug 44798 - forms Listview not showing items
Summary: forms Listview not showing items
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 2.3.2
Hardware: All All
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2016-09-27 20:38 UTC by Andrew
Modified: 2016-10-10 15:07 UTC (History)
3 users (show)

Is this bug a regression?: ---
Last known good build:

sample bug project (55.50 KB, application/zip)
2016-09-28 13:35 UTC, Andrew

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Description Andrew 2016-09-27 20:38:40 UTC

code sample provided.  

Forms, ListView only showing last items in the list on Android and iOS.  

it works if you create the ItemTemplate like this (not like the one provided in code)

	list1.ItemTemplate = new DataTemplate(() =>
			   var label1 = new Label();
			   label1.FontAttributes = FontAttributes.Bold;
			   label1.TextColor = Color.Black;
			   label1.SetBinding(Label.TextProperty, "Subject");

			   var layout1 = new StackLayout();
			   return new ViewCell { View = layout1 };

Fails to bind this way:
 public Page1()
            var list1 = new ListView();
            //list1.HasUnevenRows = true;
            list1.IsGroupingEnabled = false;
            //list1.SetBinding(ListView.ItemsSourceProperty, "Model");

            var txtSubject = new Label
                TextColor = Color.Black

            txtSubject.SetBinding(Label.TextProperty, "Subject");

            list1.ItemTemplate = new DataTemplate(() =>
               var view = new ViewCell();
               view.View = new StackLayout
                   HeightRequest = 60,
                   Children =
               return view;

            var data2 = new List<Message>();
            data2.Add(new Message { Subject = "Test2" });
            data2.Add(new Message { Subject = "Test4" });
            data2.Add(new Message { Subject = "Test14" });

            list1.ItemsSource = data2;

            this.Content = list1;

Model class.

    public class Message
        public Message()

        public string Subject
Comment 1 Andrew 2016-09-28 13:34:03 UTC
Sample instructions:

Open App.cs.

change this line:

// Bug
MainPage = new NavigationPage(new ErrorPage());

// Works
MainPage = new NavigationPage(new OKPage());

Xamarin.Forms v2.3.2.127  (confirmed) iOS and Android

Xamarin.Forms v2.3.3.152-pre2 (confirmed) iOS and Android
Comment 2 Andrew 2016-09-28 13:35:05 UTC
Created attachment 17785 [details]
sample bug project
Comment 3 E.Z. Hart [MSFT] 2016-10-10 15:07:15 UTC
In the non-working version of your code, you've created exactly one instance of the Label control (outside of your template); that same instance is used for every templated ListView item. The ViewCell for the first item ("Test2") is created and that single instance of Label is added to it. Then the ViewCell for the second item ("Test4") is created and the single Label instance is added to it (and removed from the "Test2" ViewCell, since a control can only exist in one place at a time). Finally, the ViewCell for the third item ("Test14") is created, and again the single instance of Label is added to that ViewCell (and removed from the "Test4" ViewCell). So only the last ViewCell created has a Label in it.

In your working version, you're creating a new instance of Label for each ViewCell, so each ViewCell has a control for displaying data. This is the correct way to create a DataTemplate.