Rank 1
I was trying to create a chart where some of the values might be missing, using the following class for the chart data:
public class DashboardData{ public string Category { get; set; } public double? Value { get; set; }}
When running on iOS I get the following exception when showing the chart (it works on Android and UWP):
System.NullReferenceException: Object reference not set to an instance of an object
at Telerik.XamarinForms.ChartRenderer.iOS.ManagedChartDataSource.GetPoint (TelerikUI.TKChart chart, System.nuint dataIndex, System.nuint seriesIndex) [0x000c0] in <7703bf205c0d44fb9c68eb78a97e22de>:0
at (wrapper managed-to-native) ApiDefinition.Messaging:void_objc_msgSendSuper_IntPtr (intptr,intptr,intptr)
at TelerikUI.TKChart.set_XAxis (TelerikUI.TKChartAxis value) [0x00047] in <5bae2bad360b4d5da328902516ddda38>:0
at Telerik.XamarinForms.ChartRenderer.iOS.CartesianChartAdapter.UpdateXAxis (Telerik.XamarinForms.Chart.RadCartesianChart sourceOwner, TelerikUI.TKChart targetOwner) [0x0002e] in <7703bf205c0d44fb9c68eb78a97e22de>:0
at Telerik.XamarinForms.ChartRenderer.iOS.CartesianChartAdapter.UpdateCore (Telerik.XamarinForms.Chart.RadCartesianChart sourceOwner, Telerik.XamarinForms.ChartRenderer.iOS.TKExtendedChart targetOwner, System.String propertyName, Telerik.XamarinForms.Common.IParentElement sourceOwnerRoot, System.Object targetOwnerRoot) [0x0003f] in <7703bf205c0d44fb9c68eb78a97e22de>:0
at Telerik.XamarinForms.ChartRenderer.iOS.BaseChartAdapter`1[S].Update (System.Object sourceOwner, System.Object targetOwner, System.String propertyName, System.Object sourceOwnerRoot, System.Object targetOwnerRoot) [0x00000] in <7703bf205c0d44fb9c68eb78a97e22de>:0
at Telerik.XamarinForms.Common.XamarinToNativeControlExtensions.Update[T,K] (T nativeElement, K xfЕlement, System.String propertyName, System.Object sourceOwnerRoot, System.Object targetOwnerRoot) [0x00031] in <be10754fe83d4f30b3bf0368f5628901>:0
at Telerik.XamarinForms.ChartRenderer.iOS.BaseChartRenderer`1[T].OnElementAttached (T newElement) [0x00068] in <7703bf205c0d44fb9c68eb78a97e22de>:0
at Telerik.XamarinForms.ChartRenderer.iOS.CartesianChartRenderer.OnElementAttached (Telerik.XamarinForms.Chart.RadCartesianChart newElement) [0x00000] in <7703bf205c0d44fb9c68eb78a97e22de>:0
at Telerik.XamarinForms.Common.iOS.IosRendererBase`2[S,T].OnElementChanged (Xamarin.Forms.Platform.iOS.ElementChangedEventArgs`1[TElement] e) [0x00037] in <be10754fe83d4f30b3bf0368f5628901>:0
at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00110] in D:\agent\_work\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:189
at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in D:\agent\_work\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:140
at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\agent\_work\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:193
at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0002a] in D:\agent\_work\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:77
at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in D:\agent\_work\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:45
at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x000cc] in D:\agent\_work\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:176
at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in D:\agent\_work\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:140
at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\agent\_work\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:193
at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0002a] in D:\agent\_work\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:77
at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (System.Object sender, Xamarin.Forms.ElementEventArgs e) [0x0000f] in D:\agent\_work\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:129
at Xamarin.Forms.Element.OnChildAdded (Xamarin.Forms.Element child) [0x00029] in D:\agent\_work\1\s\Xamarin.Forms.Core\Element.cs:375
at Xamarin.Forms.VisualElement.OnChildAdded (Xamarin.Forms.Element child) [0x00000] in D:\agent\_work\1\s\Xamarin.Forms.Core\VisualElement.cs:578
at Xamarin.Forms.Layout`1[T].OnChildAdded (Xamarin.Forms.Element child) [0x00000] in D:\agent\_work\1\s\Xamarin.Forms.Core\Layout.cs:32
at Xamarin.Forms.Layout.OnInternalAdded (Xamarin.Forms.View view) [0x0001d] in D:\agent\_work\1\s\Xamarin.Forms.Core\Layout.cs:416
at Xamarin.Forms.Layout.InternalChildrenOnCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00089] in D:\agent\_work\1\s\Xamarin.Forms.Core\Layout.cs:406
at (wrapper delegate-invoke) <Module>:invoke_void_object_NotifyCollectionChangedEventArgs (object,System.Collections.Specialized.NotifyCollectionChangedEventArgs)
at System.Collections.ObjectModel.ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x0000f] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/mcs/class/referencesource/System/compmod/system/collections/objectmodel/observablecollection.cs:288
at System.Collections.ObjectModel.ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedAction action, System.Object item, System.Int32 index) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/mcs/class/referencesource/System/compmod/system/collections/objectmodel/observablecollection.cs:351
at System.Collections.ObjectModel.ObservableCollection`1[T].InsertItem (System.Int32 index, T item) [0x00024] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/mcs/class/referencesource/System/compmod/system/collections/objectmodel/observablecollection.cs:219
at System.Collections.ObjectModel.Collection`1[T].Add (T item) [0x00020] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/mcs/class/referencesource/mscorlib/system/collections/objectmodel/collection.cs:67
at Xamarin.Forms.ObservableWrapper`2[TTrack,TRestrict].Add (TRestrict item) [0x0004b] in D:\agent\_work\1\s\Xamarin.Forms.Core\ObservableWrapper.cs:35
at Telerik.XamarinForms.Primitives.RadBusyIndicator.set_VisibleContent (Xamarin.Forms.View value) [0x00042] in <af0c70c9531f45dda8deaaa076f7473e>:0
at Telerik.XamarinForms.Primitives.RadBusyIndicator.DisplayActualContent () [0x00017] in <af0c70c9531f45dda8deaaa076f7473e>:0
at Telerik.XamarinForms.Primitives.RadBusyIndicator.OnIsBusyPropertyChanged (Telerik.XamarinForms.Primitives.RadBusyIndicator indicator, System.Boolean oldValue, System.Boolean newValue) [0x00000] in <af0c70c9531f45dda8deaaa076f7473e>:0
at Telerik.XamarinForms.Common.BindablePropertyExtensions+<>c__DisplayClass6_0`2[TDeclarer,TPropertyType].<Create>b__0 (Xamarin.Forms.BindableObject b, System.Object o, System.Object n) [0x00000] in <be10754fe83d4f30b3bf0368f5628901>:0
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) [0x0011b] in D:\agent\_work\1\s\Xamarin.Forms.Core\BindableObject.cs:597
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:391
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:174
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.<PropertyChanged>b__47_0 () [0x00000] in D:\agent\_work\1\s\Xamarin.Forms.Core\BindingExpression.cs:547
at Foundation.NSAsyncActionDispatcher.Apply () [0x00000] in /Users/builder/data/lanes/5665/f70a1348/source/xamarin-macios/src/Foundation/NSAction.cs:163
--- End of stack trace from previous location where exception was thrown ---
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 /Users/builder/data/lanes/5665/f70a1348/source/xamarin-macios/src/UIKit/UIApplication.cs:79
at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Users/builder/data/lanes/5665/f70a1348/source/xamarin-
If I alter double? to double in the data class and adjust the code accordingly then the chart shows as it should and there is no exception.
1 Answer, 1 is accepted
At the moment null values are not supported in our chart. This is logged in our feedback portal where you can track the feature request and vote for it. Please, accept our apologies for not being able to meet your requirements.
Best regards,
Ves
Progress Telerik