Xamarin form update listView itemSource

Question

Ok I have a ListView object which have a List as ItemSource and I\'d like to refresh the ItemSource whene

Answer 1

You can define a base view model and inherit it from INotifyPropertyChanged

public abstract class BaseViewModel : INotifyPropertyChanged
    {
        protected bool ChangeAndNotify(ref T property, T value, [CallerMemberName] string propertyName = "")
        {
            if (!EqualityComparer.Default.Equals(property, value))
            {
                property = value;
                NotifyPropertyChanged(propertyName);
                return true;
            }


            return false;
        }


        protected void NotifyPropertyChanged([CallerMemberName] string propertyName = "")
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
    }

then in your viewmodel (Ex. JM) will be inherit from BaseViewModel and can create ObservableCollection List

Also your fields in ViewModel (Ex. JM) should implement like following:

public const string FirstNamePropertyName = "FirstName";
private string firstName = string.Empty;
public string FirstName 
{
    get { return firstName; }
    set { this.ChangeAndNotify(ref this.firstName, value, FirstNamePropertyName); }
} 

Hope this helps.