xamarin.forms listview Items only update when scrolling even after iNotifyPropertychanged implementation

Question

I have a xamarin.forms app which have a listview showing item fetched from firebase. The issue I am facing is well asked question in SO ie; one of my item in listview (an item named location ) only updates when we scroll the listview. I tried to implement the iNotifyPropertychanged but still I am facing the same issue. What is the mistake I am doing here? Any help is appriciated.

My Listview Itemsource setting

var person = await firebaseHelper.GetPerson(EmployeeID);// getting data from firebase
                    LocationData = person.userdata.Where(x => DateTime.Parse(x.DateTime).ToString("yyyy-MM-dd") == StartDate.Date.ToString("yyyy-MM-dd") && x.Longitude != "initial").ToList();
                    ObservableCollection dynamicLocation = new ObservableCollection(LocationData);
                    TrackingListView.ItemsSource = dynamicLocation;
                    if (dynamicLocation.Count != 0)
                    {
                        foreach (UserLocationData Item in dynamicLocation)
                        {
                            Item.DateTime = DateTime.Parse(Item.DateTime).ToString("MMMM dd,yyyy hh:mm tt");

                            if (!string.IsNullOrEmpty(Item.Latitude) && !string.IsNullOrEmpty(Item.Longitude))
                            {

                                var Locations = await Geocoding.GetPlacemarksAsync(Convert.ToDouble(Item.Latitude), Convert.ToDouble(Item.Longitude));
                                var placemark = Locations?.FirstOrDefault();
                                if (placemark.Thoroughfare.ToString() != null)
                                {
                                    var geocodeAddress =
                                    placemark.Thoroughfare + '
' +
                                    placemark.SubAdminArea + '
';
                                    Item.Location = geocodeAddress.ToString();                                  
                                }
                                else
                                {
                                    Item.Location = Item.Latitude + "," + Item.Longitude;

                                }
                            }

                        }

My Datamodel

 public class Person : INotifyPropertyChanged
    {

        public event PropertyChangedEventHandler PropertyChanged;
        private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
        public string Name { get; set; }
        public string PersonId { get; set; }
        public string Address { get; set; }
        public string PhoneNumber { get; set; }
        public string EmailID { get; set; }
        public string Password { get; set; }       
        public bool Status { get; set; }
        public bool IsAdmin { get; set; }
        public List userdata { get; set; }
    }



 public partial class UserLocationData : INotifyPropertyChanged
    {

        public event PropertyChangedEventHandler PropertyChanged;
        private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
        public string Latitude { get; set; }
        public string Longitude { get; set; }
        public string DateTime { get; set; }


        private string _location;
        public string Location
        {
            get
            {
                return _location;
            }

            set
            {
                if (value != null)
                {
                    _location = value;
                    NotifyPropertyChanged("Selected");
                }
            }
        }


        public bool ButtonOn { get; set; }
        public bool ButtonOff { get; set; }
    }

The Firebase GetPerson portion

   public async Task GetPerson(string personId)
        {
                var allPersons = await GetAllPersons();
                await firebase
                .Child("Persons")
                .OnceAsync();
                return allPersons.Where(a => a.PersonId == personId).FirstOrDefault(); 

        }

My XAML

Morse · Accepted Answer

NotifyPropertyChanged("Selected"); it should be NotifyPropertyChanged("Location");

xamarin.forms listview Items only update when scrolling even after iNotifyPropertychanged implementation

Answers (1)

Related Questions