Pending Review
Last Updated: 17 Jul 2019 22:22 by Anthony


I rolled my app with the ListView out to production and are getting 8+ crashes a day from 140 users with the above issue. I have included a stack trace. I cannot find the steps to reproduce the issue in development. I have rolled back to using the native ListView as this does not crash the app.

Attached is an example project to see what I am doing in general terms, but I have not been able to reproduce this crash in it.

My guess is that a DataTemplate is not being cleaned up properly and when the data behind is changed it attempts to access the control that represented the data in the DataTemplate.


Xamarin caused by: android.runtime.JavaProxyThrowable: System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'Android.Support.V7.Widget.SwitchCompat'.
Java.Interop.JniPeerMembers.AssertSelf(IJavaPeerable self)<9cb01525c8ce48268eb7a54e1b653d67>:0
Java.Interop.JniPeerMembers.JniInstanceMethods.InvokeVirtualVoidMethod(string encodedMember, IJavaPeerable self, JniArgumentValue* parameters)<9cb01525c8ce48268eb7a54e1b653d67>:0
Android.Widget.CompoundButton.set_Checked(bool value)<83e36ed05052486983583851de96589e>:0
Xamarin.Forms.Platform.Android.AppCompat.SwitchRenderer.HandleToggled(object sender, EventArgs e)<e6fe81c4055a4db5bd435b7d12d894e3>:0
at Xamarin.Forms.Switch+<>c.<.cctor>b__14_0 (Xamarin.Forms.BindableObject bindable, System.Object oldValue, System.Object newValue) [0x0001c] in <209f66ed8fe04cb6a815feb8c3b62471>:0
Xamarin.Forms.BindableObject.SetValueActual(BindableProperty property, BindableObject.BindablePropertyContext context, object value, bool currentlyApplying, SetValueFlags attributes, bool silent)<209f66ed8fe04cb6a815feb8c3b62471>:0
Xamarin.Forms.BindableObject.SetValueCore(BindableProperty property, object value, SetValueFlags attributes, BindableObject.SetValuePrivateFlags privateAttributes)<209f66ed8fe04cb6a815feb8c3b62471>:0
Xamarin.Forms.BindingExpression.ApplyCore(object sourceObject, BindableObject target, BindableProperty property, bool fromTarget)<209f66ed8fe04cb6a815feb8c3b62471>:0
Xamarin.Forms.BindingExpression.Apply(bool fromTarget)<209f66ed8fe04cb6a815feb8c3b62471>:0
Java.Lang.IRunnableInvoker.n_Run(IntPtr jnienv, IntPtr native__this)<83e36ed05052486983583851de96589e>:0
at (wrapper dynamic-method) System.Object.31(intptr,intptr) Method)
java.lang.reflect.Method.invoke(Native Method)


Last Updated: 17 Jul 2019 10:01 by ADMIN
when the RadCalendar is hosted inside a ScrollView, users cannot navigate to other month using the swipe gesture
Last Updated: 16 Jul 2019 09:57 by ADMIN
Created by: Mohamed
Comments: 1
Category: DataForm
Type: Bug Report

Please refer to the attached project that reproduces the issue. In the MainPage constructor, you can switch between using the PickerEditor (validation works) and the SegmentedEditor (validation doesn't work).

// Works with validation
dataForm.RegisterEditor("Location", EditorType.PickerEditor);
// Doesn't work with validation
//dataForm.RegisterEditor("Location", EditorType.SegmentedEditor);

This leads to other issues like the PropertyValidationCompleted event not firing.

Thank you,

Last Updated: 16 Jul 2019 09:51 by ADMIN

If you have a Chart with BarSeries and TooltipBehavior defined, the tooltip of each bar is shown only when the user taps in the area around the tip of the bar.

The expected behavior is the tooltip to be displayed when clicking anywhere on the bar.

Pending Review
Last Updated: 16 Jul 2019 07:58 by DMITRIY
System.NullReferenceException is thrown when navigating back pages with RadListView and using Xamarin.Forms 4.0 or higher. 
Last Updated: 15 Jul 2019 08:38 by ADMIN
When you set custom stroke to ScatterLineSeries, the colors in the RadLegend are not updated.
In Development
Last Updated: 15 Jul 2019 08:00 by ADMIN
When I try to set the MinorTicksFill color of the TKGaugeLinearScale Ticks, I get an exception at runtime.
In Development
Last Updated: 10 Jul 2019 14:33 by ADMIN
The bug manifests itself with Xamarin.Forms 4.0, when navigating to a page with SlideView for the second time and the page is cached in memory between navigations. The following exception is thrown during the second page navigation:
System.MissingMethodException: No constructor found for Telerik.XamarinForms.PrimitivesRenderer.Android.SlideViewRenderer::.ctor(System.IntPtr, Android.Runtime.JniHandleOwnership) occurred
System.NotSupportedException: Unable to activate instance of type Telerik.XamarinForms.PrimitivesRenderer.Android.SlideViewRenderer from native handle 0x65 (key_handle 0x7b571bc). occurred
Last Updated: 10 Jul 2019 12:40 by ADMIN
SelectedIndex does not stay in sync when removing items from ObservableCollection bound as ItemsSource.  When deleting Index 2, SelectedIndex correctly moves to 1, but Slideview moves to index 0
Last Updated: 09 Jul 2019 14:28 by ADMIN

When RadCalendar is inside Xamarin Forms Tabbed Page. Switching between tabs triggers Calendar SelectionChanged and the calendar DisplayDate is changed. 

the issue could not be reproduced when RadTabView is used and its IsContentPreserved property is set to true.

Last Updated: 08 Jul 2019 15:11 by ADMIN
Release 2019.2.807 (R2 2019 minor release)

The pdf content is not visualized properly on UWP and iOS when the file is loaded from a stream. 

Also if you try to load PDF twice on the same PDF Viewer, an exception is raised.

Last Updated: 08 Jul 2019 15:08 by ADMIN
Release 2019.2.807 (R2 2019 minor release)
When the UserSortMode is set to single and it is sorted by a Template column that has DelegateSortDescriptor when we tap on another column the SortDirection of the Template is still visible.
Last Updated: 08 Jul 2019 15:08 by ADMIN
Release 2019.2.807 (R2 2019 minor release)
Created by: Yash
Comments: 0
Category: DataGrid
Type: Bug Report
If there a components which handles the Tap gesture (e.g. a button) is inside the TemplateCell, the DoubleTap gesture of the RadDataGrid throws NullReferenceException.
Last Updated: 08 Jul 2019 14:47 by ADMIN
Release 2019.2.807 (R2 2019 minor release)
Created by: IanV
Comments: 3
Category: Calendar & Scheduling
Type: Bug Report

In Xamarin Forms.


When I call Calendar.ScrollAppointmentIntoView(theItem); in Android it works fine.


In iOS when the same call is made, the calendar scrolls about 1 pixel, then stops.

I put the call into a timer just to make sure it's there.

      Device.StartTimer(TimeSpan.FromMilliseconds(3000), () =>    

              { Device.BeginInvokeOnMainThread(() => {  Calendar.ScrollAppointmentIntoView(theItem); });             

                 return false; // True = Repeat again, False = Stop the timer    



Last Updated: 08 Jul 2019 14:47 by ADMIN
Release 2019.2.807 (R2 2019 minor release)
If customers set bindings to these properties and try to set range from negative to positive values (e.g. from -0.5 to 0.5) the bindings are not applied as expected.
Last Updated: 08 Jul 2019 14:46 by ADMIN
Release 2019.2.807 (R2 2019 minor release)

When RadListView is placed inside a TabViewItem content of the RadTabView control,  it does not preserve its SelectedItem, scroll position and expanded items (if it is grouped).
Last Updated: 08 Jul 2019 14:46 by ADMIN
Release 2019.2.807 (R2 2019 minor release)
When there is custom template applied that hosts multiple rows of UI components with total height greater than 44, the template is not measured correctly, leading to wrong visualization.
Last Updated: 08 Jul 2019 14:46 by ADMIN
Release 2019.2.807 (R2 2019 minor release)
Last Updated: 05 Jul 2019 09:30 by ADMIN
When the control lost focus and tokens almost fill all the space, the ShowMoreTemplate causes flickering.
Last Updated: 05 Jul 2019 07:58 by ADMIN
If the TimelineInterval property of the DayViewSettings is set to 1 hour, and the DayEndTime is, for example, "18.30", the last 30 minutes are not visualized in the Calendar View.
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