Bug 25367 - ListView ItemsSource don't work in xaml file
Summary: ListView ItemsSource don't work in xaml file
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 1.3.0
Hardware: Macintosh Mac OS
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2014-12-14 12:12 UTC by Thetyne
Modified: 2015-01-17 07:23 UTC (History)
4 users (show)

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

Sample Code (2.48 KB, text/rtf)
2014-12-30 04:09 UTC, Arpit Jha

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Description Thetyne 2014-12-14 12:12:08 UTC
Xamarin.Forms version

I have a ListView inside xaml page definition.

i Bind inside xaml the itemsSource property, listView don't show items and i see null pointer inside itemsSource property (in debug).

the same thing work if i set itemsSource property by code.

Example KO where DataList is List or ObervableCollection:
<ListView x:Name="myListView"  ItemsSource="{Binding DataList}">
      <TextCell Text="{Binding Value}"/>

But it's work by code with -> myListView.ItemsSource=DataList;

In my Xaml file, i have other binding who work.
Comment 1 Arpit Jha 2014-12-30 04:09:53 UTC
Created attachment 9205 [details]
Sample Code

I have checked this issue and able to reproduce this issue with the help of bug description.

Steps i have followed to reproduce it:

1. Create a Xamarin form application.
2. Add a class(xaml).
3. Implement some code in BasicListxaml.
4. Assign item source on .cs page.

   listView.ItemsSource = str;
5.Run the application.
6.Observed that Listview working fine.
7.Assign datasource on Xaml page.

	<ListView x:Name="listView" 
			  ItemsSource="{Binding str}" />

8. Run the application.
9. Observed that Listview does not load data.

Note: I am getting same behaviour with Xamarin.forms version and

Environment Info:
=== Xamarin Studio ===

Version 5.5.4 (build 15)
Installation UUID: 3d25a767-a003-4a7d-9f5e-e57987cf6cf0
	Mono 3.10.0 ((detached/92c4884)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 310000031

=== Apple Developer Tools ===

Xcode 6.1 (6602)
Build 6A1052c

=== Xamarin.Mac ===

Version: (Enterprise Edition)

=== Xamarin.Android ===

Version: (Enterprise Edition)
Android SDK: /Users/mac360_xamarin/Library/Developer/Xamarin/android-sdk-macosx
	Supported Android versions:
		2.1   (API level 7)
		2.2   (API level 8)
		2.3   (API level 10)
		3.1   (API level 12)
		4.0.3 (API level 15)
		4.4   (API level 19)
		5.0   (API level 21)
Java SDK: /usr
java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)

=== Xamarin.iOS ===

Version: (Enterprise Edition)
Hash: 840a925
Build date: 2014-11-16 21:03:22-0500

=== Build Information ===

Release ID: 505040015
Git revision: f93940a35458a18052f1a25e106e62ca970d9c40
Build date: 2014-11-19 15:32:41-05
Xamarin addins: dc23cbd91a3a0e1d326328e1229e86c942a49ec8

=== Operating System ===

Mac OS X 10.10.0
Darwin mac360-xamarins-Mac-mini.local 14.0.0 Darwin Kernel Version 14.0.0
    Fri Sep 19 00:26:44 PDT 2014
    root:xnu-2782.1.97~2/RELEASE_X86_64 x86_64
Comment 2 Arpit Jha 2014-12-30 04:14:11 UTC
An update to comment 1

Ide log : https://gist.github.com/Arpit360/c7e14a5e909ff6a3b9f0
Comment 3 Jason Smith [MSFT] 2015-01-17 05:55:10 UTC
We will need to see your ViewModel to accurately diagnose the issue. This is likely a visibility issue in the ViewModel
Comment 4 Thetyne 2015-01-17 07:23:36 UTC
Finally, it's not a bug.

in the ViewModel, i change
public ObservableCollection<string> DataList = new ObservableCollection<string>()
ObservableCollection<string> DataList {get; set; }

Sorry :)