Connecting Xamarin.Forms to Web Services - asp.net

Question

Good Day Everyone. I want all the records created in ASP.NET Web Application to be shown in my Mobile App Xamarin.Forms. What's happening to my program is that I was able to create records in my Web Application and save it, but I wasn't able to make it appear in my Xamarin.Forms Mobile app. I have created a MainViewModel that will get the records from the Web Application which I have binded to my MainPage. These are my codes:
MainPageMain.xaml
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:XamarinDemoApp"
x:Class="XamarinDemoApp.MainPageMain"
xmlns:ViewModels="clr-namespace:XamarinDemoApp.ViewModels;assembly=XamarinDemoApp"
BackgroundColor="Teal"
Title=" Title Bar">
<ContentPage.BindingContext>
<ViewModels:MainViewModel/>
</ContentPage.BindingContext>
<StackLayout Orientation="Vertical">
<ListView ItemsSource="{Binding EmployeesList}" HasUnevenRows="True">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout Orientation="Horizontal">
<Label Text="{Binding Name}" FontSize="24"/>
<Label Text="{Binding Department}" FontSize="24"/>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<Label Text="This is the MainPage"/>
</StackLayout>
MainViewModel.cs
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using XamarinDemoApp.Models;
using XamarinDemoApp.Services;
namespace XamarinDemoApp.ViewModels
{
public class MainViewModel : INotifyPropertyChanged
{
private List<Employee> _employeesList;
public List<Employee> EmployeesList
{
get { return _employeesList; }
set
{
_employeesList = value;
OnPropertyChanged();
}
}
public MainViewModel()
{
InitializeDataAsync();
}
private async Task InitializeDataAsync()
{
var employeesServices = new EmployeesServices();
EmployeesList = await employeesServices.GetEmployeesAsync();
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}

Answer 1

You should use ObservableCollections, something like this:
private ObservableCollection<Employee> _employeesList;
public ObservableCollection<Employee> EmployeesList
{
get { return _employeesList; }
set { Set(() => EmployeesList, ref _employeesList, value); }
}
then
private async Task InitializeDataAsync()
{
var employeesServices = new EmployeesServices();
var employees = await employeesServices.GetEmployeesAsync();
EmployeesList = new ObservableCollection<Employee>(employees);
}