DataGrid Null Reference Exception

[Louis Lewis]

Hi,

I have a simple setup.
A data grid, which contains two cells.

A text column and a template column.

The button is bound to a delegate command,

which in turn requests navigation.

Showing a list of items, when the user click edit,

I would navigate to the edit view for the particular record.

The stack trace makes no sense, and is certainly not pointing to an issue in my code,

from what I can see.

  at Syncfusion.SfDataGrid.XForms.Droid.VirtualizingCellControlRenderer.OnTouchEvent (Android.Views.MotionEvent e) [0x004bd] in <42c48b3923974f68a643233c437121ed>:0 

  at Android.Views.View.n_OnTouchEvent_Landroid_view_MotionEvent_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_e) [0x00010] in /Users/builder/azdo/_work/278/s/xamarin-android/src/Mono.Android/obj/Release/monoandroid10/android-30/mcw/Android.Views.View.cs:18560 

  at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.48(intptr,intptr,intptr)

The code for the button is just as simple

        private async void RequestNavigateToEditItem(Guid? itemId)

        {

            try

            {

                if (!itemId.HasValue)

                {

                    return;

                }

                this.IsBusy = true;

                await this.NavigationService.NavigateAsync(name: WellKnownPages.LandingPage); // <----- Exception gets thrown when this is called

            }

            catch (Exception ex)

            {

                Crashes.TrackError(ex);

            }

            finally

            {

                this.IsBusy = false;

            }

        }

The Xaml, is super simple still, as I was just getting started 

                <datagrid:SfDataGrid 

                    x:Name="subscriptionGrid"

                    ColumnSizer="Star"

                    AutoGenerateColumns="False"

                    VerticalOptions="FillAndExpand"

                    ItemsSource="{Binding Items}">

                    <datagrid:SfDataGrid.Columns>

                        <datagrid:GridTextColumn HeaderText="Name"

                                   MappingName="Name" />

                        <datagrid:GridTemplateColumn MappingName="Id">

                            <datagrid:GridTemplateColumn.CellTemplate>

                                <DataTemplate>

                                    <buttons:SfButton

                                        Text="Configure"

                                        TextColor="Blue"

                                        ImageSource="success-icon.png"

                                        ShowIcon="True" 

                                        ImageWidth="60"

                                        BorderColor="Transparent"

                                        BackgroundColor="Transparent"

                                        ImageAlignment="Start"

                                        Command="{Binding Source={x:Reference subscriptionGrid}, Path=BindingContext.EditItem}"

                                        CommandParameter="{Binding Id}"/>

                                </DataTemplate>

                            </datagrid:GridTemplateColumn.CellTemplate>

                        </datagrid:GridTemplateColumn>

                    </datagrid:SfDataGrid.Columns>

                </datagrid:SfDataGrid>

The items I am binding to can be simplified to this

public class Item
{
     public Guid Id {get;set;}
     public string Name {get;set;}
}

I have a list of them through this 

public ObservableCollection<Item> Items { get; set; }

The edit item command looks like this 

public DelegateCommand<Guid?> EditItem { get; set; }

Which is newed up in the constructor like this 

this.EditItem = new DelegateCommand<Guid?>(this.RequestNavigateToEditItem);

[Karthikraja Kalaimani]

Hi Louis,

Currently, we are preparing sample to reproduce the issue. We will update the details on or before 8^th April 2021. In the meantime, could you please let us know the SfDataGrid version, Xamarin Forms version and Prism version ?  

Regards,
Karthik Raja 

[Louis Lewis]

Hi Karthik,

Sorry for the delay.
I confirmed its the latest available versions of all packages from nuget.

Regards

Louis

[Chandrasekar Sampathkumar]

Hi Louis, 

Thank you for the update. 

As promised, we will update you further details on April 8^th, 2021. We appreciate your patience until then. 

Regards, 

Chandrasekar Sampathkumar 

[Chandrasekar Sampathkumar]

Hi Louis, 

Thank you for your patience. 

We have prepared simple sample based on the code snippet provided. We regret to let you know that we are not able to replicate the reported issue. We have attached the tested sample for your reference and you can download the same using the following link, 

Sample Link: Sample 

Could you please replicate the issue for us in the attached sample or could you please share the code snippets for WellKnownPages.LandingPage. 

Regards, 

Chandrasekar Sampathkumar 

[Louis Lewis]

Hi,

No worries, behind those statics properties are simple strings.

"/NavigationPage/Landing"

"NavigationPage/Login"

Does this help?

[Chandrasekar Sampathkumar]

Hi Louis, 

Thank you for the update. 

We are not able to replicate the reported issue using the provided input. We have attached the tested sample for your reference and you can download the same using the following link, 

Sample Link: Sample 

Could you please run the attached sample and check whether the issue replicated from your side. If the issue is not replicated, could you please replicate the issue for us. 

Regards, 

Chandrasekar Sampathkumar