AutoFitMode="Height" crash on back button pressed when SfListView is dispossed

[Emil]

It looks like that  missing a null control in  auto fit mode function as you can see the exception message below. It is probably a rare scenario but in my case, I have SfListView whose itemsource is changed dynamically in the background. So I am using it like roadmap. If the user presses back button while I am raising property changed on itemsource. This error is appearing because obviously ListView is disposed and at the same time it tries to calculate size of the item. Please add a null check if list or item is null, dont calculate it.

System.NullReferenceExceptionObject reference not set to an instance of an object.

  at Syncfusion.ListView.XForms.Android.MeasureSize.Convert (Xamarin.Forms.View view, Xamarin.Forms.VisualElement valid) [0x0002d] in <1c388d604ec64a4288068581d0737135>:0 
  at Syncfusion.ListView.XForms.Android.MeasureSize.CalculateSize (Syncfusion.ListView.XForms.SfListView listview, Xamarin.Forms.View content, Xamarin.Forms.Size viewSize) [0x0000a] in <1c388d604ec64a4288068581d0737135>:0 
  at Syncfusion.ListView.XForms.LayoutBase.GetAutoFitItemSize (Syncfusion.ListView.XForms.ListViewItemInfoBase itemInfo, System.Double& itemSize, System.Double itemSpacing, System.Int32 spanCount) [0x000a1] in <9723873943804942baab770e25a04a31>:0 
  at Syncfusion.ListView.XForms.LinearLayout.GetAutoFitItemSize (Syncfusion.ListView.XForms.ListViewItemInfoBase itemInfo, System.Double& itemSize, System.Double itemSpacing) [0x00000] in <9723873943804942baab770e25a04a31>:0 
  at Syncfusion.ListView.XForms.LinearLayout.SetRowHeight (Syncfusion.ListView.XForms.ListViewItemInfo itemInfo, System.Int32 index, System.Double& size, System.Double itemSpacing) [0x00011] in <9723873943804942baab770e25a04a31>:0 
  at Syncfusion.ListView.XForms.LinearLayout.SetRowHeight (Syncfusion.ListView.XForms.ListViewItemInfo itemInfo, System.Double itemSpacing) [0x0008e] in <9723873943804942baab770e25a04a31>:0 
  at Syncfusion.ListView.XForms.LinearLayout.EnsureItems (Syncfusion.GridCommon.ScrollAxis.VisibleLinesCollection visibleLines) [0x002ab] in <9723873943804942baab770e25a04a31>:0 
  at Syncfusion.ListView.XForms.VisualContainer.EnsureItems () [0x0002b] in <9723873943804942baab770e25a04a31>:0 
  at Syncfusion.ListView.XForms.VisualContainer.OnSizeAllocated (System.Double width, System.Double height) [0x0003f] in <9723873943804942baab770e25a04a31>:0 
  at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\VisualElement.cs:637 
  at Xamarin.Forms.Layout.ForceLayout () [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Layout.cs:115 
  at Syncfusion.ListView.XForms.SfListView.RefreshView () [0x00036] in <9723873943804942baab770e25a04a31>:0 
  at Syncfusion.ListView.XForms.SfListView.OnItemsSourceChanged (Xamarin.Forms.BindableObject bindable, System.Object oldValue, System.Object newValue) [0x00060] in <9723873943804942baab770e25a04a31>: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) [0x00108] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:596 
  at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, Xamarin.Forms.Internals.SetValueFlags attributes, Xamarin.Forms.BindableObject+SetValuePrivateFlags privateAttributes) [0x0015b] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:390 
  at Xamarin.Forms.BindingExpression.ApplyCore (System.Object sourceObject, Xamarin.Forms.BindableObject target, Xamarin.Forms.BindableProperty property, System.Boolean fromTarget) [0x001f9] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindingExpression.cs:174 
  at Xamarin.Forms.BindingExpression.Apply (System.Boolean fromTarget) [0x0003e] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindingExpression.cs:56 
  at Xamarin.Forms.BindingExpression+BindingExpressionPart.<PropertyChanged>b__47_0 () [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindingExpression.cs:551 
  at Java.Lang.Thread+RunnableImplementor.Run () [0x00008] in <c82a099136944d8aa96281cf061cbc12>:0 
  at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00008] in <c82a099136944d8aa96281cf061cbc12>:0 
  at (wrapper dynamic-method) System.Object:5cc084e2-31f5-4946-bfdf-a8eb2fd2796e (intptr,intptr)

[Muthu Kumaran Gnanavinayagam]

Hi Emil, 

 

A support incident has been created under your account to track the status of the reported query. Please log on to our support website to check for further updates.      

   

Link: https://www.syncfusion.com/account/login 

 

Regards, 

G. Muthu Kumaran.