NullReferenceException calling MapPins.Clear () (OnCollectionChanged)

[marcoseraphin]

Hi,

thanx for the fix concerning SetMapCenter()....no problems here any more.

BUT: I have a new problem in OnCollectionChanged(). I am clearing my MapPins collection and adding a new pin with updated GPS data.

While calling this.MapPins.Clear () a second time I am getting this error:

at TK.CustomMap.iOSUnified.TKCustomMapRenderer.OnCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x0014e] in :0
at (wrapper delegate-invoke) :invoke_void_object_NotifyCollectionChangedEventArgs (object,System.Collections.Specialized.NotifyCollectionChangedEventArgs)
at System.Collections.ObjectModel.ObservableCollection1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00012] in /Users/builder/data/lanes/2689/962a0506/source/mono/external/referencesource/System/compmod/system/collections/objectmodel/observablecollection.cs:286 at System.Collections.ObjectModel.ObservableCollection1[T].OnCollectionReset () [0x00000] in /Users/builder/data/lanes/2689/962a0506/source/mono/external/referencesource/System/compmod/system/collections/objectmodel/observablecollection.cs:373
at System.Collections.ObjectModel.ObservableCollection1[T].ClearItems () [0x00022] in /Users/builder/data/lanes/2689/962a0506/source/mono/external/referencesource/System/compmod/system/collections/objectmodel/observablecollection.cs:187 at System.Collections.ObjectModel.Collection1[T].Clear () [0x00017] in /Users/builder/data/lanes/2689/962a0506/source/mono/external/referencesource/mscorlib/system/collections/objectmodel/collection.cs:87
at VagaBoo.MapViewModel.OnViewAppearing () [0x0002b] in /Users/marcoseraphin/Xamarin/Xamarin/Projekte/VagaBooMobileApp/VagaBooMobileApp (trunk)/VagaBoo/ViewModel/TabPageSetTwo/MapViewModel.cs:87
at XLabs.Forms.Mvvm.BaseView.OnAppearing () [0x00027] in :0
at VagaBoo.Waiting.WaitingPage.OnAppearing () [0x00002] in /Users/marcoseraphin/Xamarin/Xamarin/Projekte/VagaBooMobileApp/VagaBooMobileApp (trunk)/VagaBoo/WaitingPage/WaitingPage.cs:141
at VagaBoo.MapPage.OnAppearing () [0x00002] in /Users/marcoseraphin/Xamarin/Xamarin/Projekte/VagaBooMobileApp/VagaBooMobileApp (trunk)/VagaBoo/Pages/TabPageSetTwo/MapPage.xaml.cs:28
at Xamarin.Forms.Page.SendAppearing () [0x00024] in :0
at Xamarin.Forms.Platform.iOS.PageRenderer.ViewDidAppear (Boolean animated) [0x00025] in :0
at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
at UIKit.UIApplication.Main (System.String[] args, IntPtr principal, IntPtr delegate) [0x00005] in /Users/builder/data/lanes/2689/962a0506/source/maccore/src/UIKit/UIApplication.cs:77
at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Users/builder/data/lanes/2689/962a0506/source/maccore/src/UIKit/UIApplication.cs:61
at VagaBoo.iOS.Application.Main (System.String[] args) [0x00008] in /Users/marcoseraphin/Xamarin/Xamarin/Projekte/VagaBooMobileApp/VagaBooMobileApp (trunk)/iOS/Main.cs:17