Calendar crash on UWP when clicking around to change the date in UI for Xamarin

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Calendar crash on UWP when clicking around to change the date

11 Answers 10 Views

This is a migrated thread and some comments may be shown as answers.

Valentin asked on 22 Aug 2018, 11:29 PM

Hello,

I ran into a scenario where clicking randomly with the mouse to change the date eventually results in a crash. It typically takes 10 or more clicks in relatively fast succession. I was not able to find a specific pattern that causes the crash. However, I can recreate it more reliably when the calendar has MaxDate set.

Here's the crash stack trace:

at System.ThrowHelper.ThrowAddingDuplicateWithKeyArgumentException(Object key)

at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)

at Telerik.UI.Xaml.Controls.Input.Calendar.XamlDecorationLayer.GetCalendarDecorationVisual(CalendarNode node, CalendarDecorationType decorationType)

at Telerik.UI.Xaml.Controls.Input.Calendar.XamlDecorationLayer.UpdateCalendarCellDecorations(IEnumerable`1 cellsToUpdate)

at Telerik.UI.Xaml.Controls.Input.Calendar.XamlDecorationLayer.UpdateUI(IEnumerable`1 cellsToUpdate)

at Telerik.UI.Xaml.Controls.Input.RadCalendar.UpdatePresenters(IEnumerable`1 cellsToUpdate)

at Telerik.UI.Xaml.Controls.Input.Calendar.CurrencyService.UpdatePresenters(DateTime oldCurrentDate, DateTime newCurrentDate)

at Telerik.UI.Xaml.Controls.Input.Calendar.CurrencyService.<>c__DisplayClass19_0.<AsyncUpdateCurrencyPresenters>b__0()

Here's the code I used:

XAML

<?xml version="1.0" encoding="utf-8" ?>

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"

xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"

x:Class="CalendarCrash.MainPage"

xmlns:telerikInput="clr-namespace:Telerik.XamarinForms.Input;assembly=Telerik.XamarinForms.Input">

<Grid>

<Grid.RowDefinitions>

<RowDefinition Height="1*"/>

</Grid.RowDefinitions>

<telerikInput:RadCalendar

HorizontalOptions="CenterAndExpand"

VerticalOptions="CenterAndExpand"

x:Name="calendar" />

<Label Grid.Row="1" Text="Calendar crash"

HorizontalOptions="CenterAndExpand"

VerticalOptions="CenterAndExpand" />

</Grid>

</ContentPage>

Code behind:

using System;

using Xamarin.Forms;

namespace CalendarCrash

{

public partial class MainPage : ContentPage

{

public MainPage()

{

InitializeComponent();

calendar.MaxDate = DateTime.Now;

}

Could you recommend any workaround or does this require a bug fix on your end?

11 Answers, 1 is accepted

answered on 28 Aug 2018, 07:51 AM

XFCalendar.zip

Hi Valentin,

Thank you for the provided code.

I have tested the described scenario on UWP but on my side it works fine. I have created a sample example using the latest version of Telerik UI for Xamarin and Xamarin.Forms v3.1.0.697729. Please take a look at the attached sample and let me know if you continue getting those errors.

Looking forward to your reply.

Regards,
Didi
Progress Telerik

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answered on 19 Sep 2018, 03:13 PM

Hi, Valentin,

Thank you for your patience.

We have investigated the behavior and managed to apply a fix which should deal with the issue. The fix will be available with the next release so you can test the behavior with the binaries once they are available. Here is the actual bug report, we will change the status of the item once the fix is officially included - Calendar: Switching through the cells throws KeyNotFoundException.

If you have any further questions or concerns, do not hesitate to contact us.

Regards,
Stefan Nenchev
Progress Telerik

Accepted