LoadTemplate should not be null

[Liam Keogh]

I am getting the error mentioned above when I try to implement a data template selector on the sfRotator control. 

Running on Visual Studio Enterprise 2019

Syncfusion control version 17.1.0.47

        <ResourceDictionary>

            <DataTemplate x:Key="SampleTemplateTextLine">

                <ViewCell>

                    <local:TextLine

                        HorizontalOptions="FillAndExpand"

                        Columns="{Binding Columns}" />

                </ViewCell>

            </DataTemplate>

            <DataTemplate x:Key="SampleTemplateEmptyLine">

                <ViewCell>

                    <BoxView

                        BackgroundColor="Transparent"

                        HorizontalOptions="FillAndExpand"

                        HeightRequest="10"/>

                </ViewCell>

            </DataTemplate>

            <local:SampleTemplateSelector x:Key="SampleTemplateSelector"

                SampleTemplateTextLine="{StaticResource SampleTemplateTextLine}"

                SampleTemplateEmptyLine="{StaticResource SampleTemplateEmptyLine}" />

        </ResourceDictionary>

            <sfRotator:SfRotator

                HorizontalOptions="FillAndExpand"

                VerticalOptions="FillAndExpand"

                NavigationStripMode="Dots"

                NavigationDirection="Horizontal"

                ItemsSource="{Binding SampleList}"

                ItemTemplate="{StaticResource SampleTemplateSelector}">

            </sfRotator:SfRotator>

[Muneesh Kumar G]

Hi Liam, 

 

Greetings from Syncfusion.  

 

We have analyzed your query and we would like to inform you that this problem has been fixed in our latest Vol 2 Beta release (17.2.0.28). Please upgrade our version to resolve this problem.  

 

Before update to Beta version, please follow steps mentioned in below link to clear old nuget cache.   

  

https://www.syncfusion.com/kb/6987/how-to-clear-nuget-cache 

 

Regards, 

Muneesh Kumar G.    

[Liam Keogh]

Hi Muneesh, unfortunately updating to version 17.2.28-beta introduces a NullReferenceException.

UNHANDLED EXCEPTION:

System.NullReferenceException: Object reference not set to an instance of an object.

at Syncfusion.SfRotator.XForms.Droid.SfRotatorRenderer.GetViewTemplateFromTemplate (Xamarin.Forms.DataTemplate template, System.Int32 index, Xamarin.Forms.Rectangle size, Syncfusion.SfRotator.XForms.SfRotator _rotator)

Can you confirm if this has anything to do with my Xamarin.Forms version or not?

[Muneesh Kumar G]

Hi Liam,  

 

We have analyzed your code snippet and we found that the reported problem occurs due to using the ViewCell in DataTemplate.  

 

You can resolve this problem by using TextLine directly without ViewCell in DataTemplate.  

  

Regards,  

Muneesh Kumar G.