I have tried a lot of combination to test the code in LoadData function.
The first time the Page loaded, the LoadData function got called. Later user change the date which causing the LoadData function to be called again. This time there was an error quoted below. If I commented the Collection = programs line, the code have no problem.
The problem even if the programs has 0 item in the second execution of the function.
public async Task LoadData (DateTime day)
{
this.day = day;
var programs = await new ECEProgramLogic().GetGrouppedProgram(day.Date, actionNameType);
Collection = programs;
}
private ObservableCollection<GroupViewModel<object>> collection;
public ObservableCollection<GroupViewModel<object>> Collection
{
get
{
return collection;
}
set
{
collection = value;
Banner = new NoDataBannerViewModel<GroupViewModel<object>>(value, AppResources.NoDataToShow);
OnPropertyChanged(nameof(Collection));
}
}
Specified argument was out of the range of valid values. Parameter name: index
Stacktrace from Xamarin:
at Xamarin.Forms.ListProxy.get_Item (System.Int32 index) [0x0000b] in D:\agent_work\1\s\Xamarin.Forms.Core\ListProxy.cs:127 at Xamarin.Forms.ListProxy.System.Collections.IList.get_Item (System.Int32 index) [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\ListProxy.cs:444 at Xamarin.Forms.Internals.TemplatedItemsList
2[TView,TItem].get_Item (System.Int32 index) [0x00008] in <afec569c85894ae9a18371a2fecd2d37>:0 at Xamarin.Forms.Platform.iOS.ListViewRenderer+ListViewDataSource.HeaderViewDisplayingEnded (UIKit.UITableView tableView, UIKit.UIView headerView, System.nint section) [0x0001f] in <82f6100a289642ae988dc0d85a373bef>:0 at (wrapper managed-to-native) ObjCRuntime.Messaging.void_objc_msgSend(intptr,intptr) at UIKit.UITableView.ReloadData () [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UITableView.g.cs:792 at Xamarin.Forms.Platform.iOS.ListViewRenderer.UpdateItems (System.Collections.Specialized.NotifyCollectionChangedEventArgs e, System.Int32 section, System.Boolean resetWhenGrouped) [0x002b8] in <82f6100a289642ae988dc0d85a373bef>:0 at Xamarin.Forms.Platform.iOS.ListViewRenderer.OnCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in <82f6100a289642ae988dc0d85a373bef>:0 at Xamarin.Forms.Internals.TemplatedItemsList2[TView,TItem].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x0000a] in :0 at Xamarin.Forms.Internals.TemplatedItemsList2[TView,TItem].GroupedReset () [0x000b6] in <afec569c85894ae9a18371a2fecd2d37>:0 at Xamarin.Forms.Internals.TemplatedItemsList2[TView,TItem].OnCollectionChangedGrouped (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00459] in :0 at Xamarin.Forms.Internals.TemplatedItemsList2[TView,TItem].OnProxyCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e, System.Boolean fixWindows) [0x00008] in <afec569c85894ae9a18371a2fecd2d37>:0 at Xamarin.Forms.Internals.TemplatedItemsList2[TView,TItem].OnProxyCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in :0 at Xamarin.Forms.Internals.TemplatedItemsList2[TView,TItem].OnItemsSourceChanged (System.Boolean fromGrouping) [0x00069] in <afec569c85894ae9a18371a2fecd2d37>:0 at Xamarin.Forms.Internals.TemplatedItemsList2[TView,TItem].BindableOnPropertyChanged (System.Object sender, System.ComponentModel.PropertyChangedEventArgs e) [0x00020] in :0 at (wrapper delegate-invoke) .invoke_void_object_PropertyChangedEventArgs(object,System.ComponentModel.PropertyChangedEventArgs) at Xamarin.Forms.BindableObject.OnPropertyChanged (System.String propertyName) [0x0000a] in D:\agent_work\1\s\Xamarin.Forms.Core\BindableObject.cs:146 at Xamarin.Forms.Element.OnPropertyChanged (System.String propertyName) [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\Element.cs:401 at Xamarin.Forms.BindableObject.SetValueActual (Xamarin.Forms.BindableProperty property, Xamarin.Forms.BindableObject+BindablePropertyContext context, System.Object value, System.Boolean currentlyApplying, Xamarin.Forms.Internals.SetValueFlags attributes, System.Boolean silent) [0x00107] in D:\agent_work\1\s\Xamarin.Forms.Core\BindableObject.cs:602 at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, Xamarin.Forms.Internals.SetValueFlags attributes, Xamarin.Forms.BindableObject+SetValuePrivateFlags privateAttributes) [0x0015b] in D:\agent_work\1\s\Xamarin.Forms.Core\BindableObject.cs:399 at Xamarin.Forms.BindingExpression.ApplyCore (System.Object sourceObject, Xamarin.Forms.BindableObject target, Xamarin.Forms.BindableProperty property, System.Boolean fromTarget) [0x001f9] in D:\agent_work\1\s\Xamarin.Forms.Core\BindingExpression.cs:172 at Xamarin.Forms.BindingExpression.Apply (System.Boolean fromTarget) [0x0003e] in D:\agent_work\1\s\Xamarin.Forms.Core\BindingExpression.cs:56 at Xamarin.Forms.BindingExpression+BindingExpressionPart.b__47_0 () [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\BindingExpression.cs:557 at Foundation.NSAsyncActionDispatcher.Apply () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/Foundation/NSAction.cs:163 at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr) at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIApplication.cs:79 at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIApplication.cs:63 at Tux.iOS.Application.Main (System.String[] args) [0x00001] in /Users/simon/Documents/AimyPlus/EceAdmin/Tux/Tux.iOS/Main.cs:17
> Xamarin.Android
Version: 8.2.0.16 (Visual Studio Community)
Android SDK: /Users/simon/Library/Developer/Xamarin/android-sdk-macosx
Supported Android versions:
6.0 (API level 23)
7.1 (API level 25)
8.0 (API level 26)
SDK Tools Version: 25.2.5
SDK Platform Tools Version: 25.0.5
SDK Build Tools Version: 25.0.3
Java SDK: /usr
java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL
Xamarin Inspector
Version: 1.4.0
Hash: b3f92f9
Branch: master
Build date: Fri, 19 Jan 2018 22:00:34 GMT
Client compatibility: 1
Apple Developer Tools
Xcode 9.2 (13772)
Build 9C40b
Xamarin.Mac
Version: 4.2.1.28 (Visual Studio Community)
Xamarin.iOS
Version: 11.9.1.24 (Visual Studio Community)
Hash: f62de472
Branch: xcode9.3
Build date: 2018-03-29 19:30:53-0400
It was an issue of the updated Xamarin.Forms 2.51444934. It happened when doing a groupped listview. In order to solve:
ListView.HasUnevenRows = false;
ListView.IsGroupingEnabled = false;
((ObservableCollection<T>)listView.ItemsSource).Clear();
ListView.HasUnevenRows = true;
ListView.IsGroupingEnabled = true;
Put similar code before replacing new data collection. The problem will be solved.