Hi,

When Updating Xamarin Forms to version 4.0.x.x the ListView hangs the UI and loads very slowly.

Please Check!

 

Hi Abdou,

Thank you for the provided information.

Currently we have an issue logged in our Feedback portal reporting a crash with Telerik UI for Xamarin controls when upgrading to Xamarin.Forms version 4.0 and here is the link:

https://feedback.telerik.com/xamarin/1410095-crash-when-upgrading-to-xamarin-forms-4-0

Workaround for the crash:
I could suggest you downgrade the Xamarin.Forms version to 3.6.0.264807 or higher version of 3.6.

Regarding to the "When Updating Xamarin Forms to version 4.0.x.x the ListView hangs the UI and loads very slowly"? Could you please elaborate more on this? For example this behavior observes when upgrading to Xamarin.Forms v4.0 but with the previous versions of Xamarin, the RadListView behaves as expected. For further research the case I will need more information on the exact setup you have. May I ask you to send me a sample where the issue could be reproduced or how the RadListView is defined.

Note that in the forum only image attachment are allowed. If you want to send us a sample you need to open a support ticket and attach the project there. 

Let me know if I can assist with anything else.

Regards,
Didi
Progress Telerik

Hi, I still have the same problem, binding is not working, I have something like this:

 <myControls:SearchResultListControl
                            IsPullToRefreshEnabled="False"
                            ItemsSource="{Binding Pages, Mode=OneWay}"
                            SelectedItem="{Binding SelectedPage, Mode=TwoWay}"
                            x:Name="SearchResultList">
                    <myControls:SearchResultListControl.ItemTemplateSelector>
                        <templates:SettingsTemplateSelector>
                                <templates:SettingsTemplateSelector.LabelTemplate>
                                    <DataTemplate>
                                    <listView:ListViewTemplateCell>
                                        <listView:ListViewTemplateCell.View>
                                            <pages:SettingsLabelCell />
                                        </listView:ListViewTemplateCell.View>
                                    </listView:ListViewTemplateCell>
                                </DataTemplate>
                                </templates:SettingsTemplateSelector.LabelTemplate>
                            <templates:SettingsTemplateSelector.ImageTemplate>
                                <DataTemplate>
                                    <listView:ListViewTemplateCell>
                                        <listView:ListViewTemplateCell.View>
                                            <pages:SettingsImageCell />
                                        </listView:ListViewTemplateCell.View>
                                    </listView:ListViewTemplateCell>
                                </DataTemplate>
                            </templates:SettingsTemplateSelector.ImageTemplate>
                        </templates:SettingsTemplateSelector>
                    </myControls:SearchResultListControl.ItemTemplateSelector>

                    <myControls:SearchResultListControl.ItemStyle>
                        <listView:ListViewItemStyle BackgroundColor="White"
                                                        BorderLocation="Bottom"
                                                        BorderColor="#E8E8E8"
                                                        BorderWidth="4" />
                    </myControls:SearchResultListControl.ItemStyle>
                    
                </myControls:SearchResultListControl>

where  <myControls:SearchResultListControl> is public class SearchResultListControl : RadListView in code behind.

So binding from Pages still doesnt work....Eather in Xamarin Forms starting from 3.2 to the latest one 4.XXX

Any suggestions?

Hi Tino,

The issue logged in our Feedback portal regarding the crash on Xamarin.Forms 4.0 was fixed. A fix for it is included in the Telerik UI for Xamarin Release 2019.2.603.360 (R2 2019 minor release). 
If you still observe same issue or similar to the reported one (when using the minor release or newer version of Telerik UI for Xamarin). - may I ask you to send us a sample where the exception could be reproduced. In this way we could research the concrete scenario further.

Note: You should open a support ticket and attach the project there because in the forum only image attachments are allowed. 

Looking forward to your reply. 

Regards,
Didi
Progress Telerik