Bug 359 - 4.1 crash with ABPeoplePickercontroller
Summary: 4.1 crash with ABPeoplePickercontroller
Status: RESOLVED DUPLICATE of bug 980
Alias: None
Product: iOS
Classification: Xamarin
Component: General ()
Version: 4.x
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2011-08-22 05:19 UTC by john murray
Modified: 2011-09-29 19:12 UTC (History)
3 users (show)

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

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Description john murray 2011-08-22 05:19:42 UTC
talke any new solution and insert the following code 
the following code runs fine under 4.1 but crashes with no chance of debug in 4.1 
error given is null object reference 

interestingly if one comments out the two delegates -ppvc.Cancel and ppvc.SelectPerson then it will run under 4.1 - however if one reintroduces the delegates even with empty code and no action then the crash reappears 

public partial class AppDelegate : UIApplicationDelegate
protected ABPeoplePickerNavigationController  ppvc=new  ABPeoplePickerNavigationController(); 	
		public override bool FinishedLaunching (UIApplication app, NSDictionary options)
			window.AddSubview (navcontrol.View);
			window.MakeKeyAndVisible ();
	        button.TouchUpInside +=delegate{
			ppvc.Cancelled+=delegate(object sender,EventArgs e)
				{				navcontrol.DismissModalViewControllerAnimated(true);
				}  ;
ppvc.SelectPerson+=delegate (object sender,ABPeoplePickerSelectPersonEventArgs args1)
if (!args1.Continue)
				{ navcontrol.DismissModalViewControllerAnimated(true);}
			} ;			
			return true;
Comment 1 Sebastien Pouliot 2011-08-22 10:06:55 UTC
'navcontrol' is not assigned anywhere so I could be the cause of your NullReferenceException - but that would not explain how it works without the delegates.

Please provide a self-contained test case so we can be sure we'll get the exact same error as you get. Thanks
Comment 2 Sebastien Pouliot 2011-09-29 19:12:35 UTC
Fix available in MonoTouch 4.2.2

*** This bug has been marked as a duplicate of bug 980 ***