Xamarin Listview don't show the observable Collection - xamarin.forms

Question

I'm using Xamarin.Forms MVVM to develop my app, and don't found what I'm doing wrong, I have an ObservableCollection with the values from web API, and when I set a break point all the values are good even in the view when I see the values of the binding source everything have the value, but the values are not showing up in my ListView.
Here is the ViewModel
class DatosMedicosViewModel : BaseViewModel
{
private ApiService apiService;
private ObservableCollection<Land> land;
private bool isRefreshing;
public ObservableCollection<Land> Lands
{
get { return this.land; }
set { SetValue(ref this.land, value); }
}
public bool IsRefreshing
{
get { return this.isRefreshing; }
set { SetValue(ref this.isRefreshing, value); }
}
public DatosMedicosViewModel()
{
this.apiService = new ApiService();
this.LoadLand();
}
private async void LoadLand()
{
this.IsRefreshing = true;
var connection = await this.apiService.CheckConnection();
if (!connection.IsSuccess)
{
this.IsRefreshing = false;
await Application.Current.MainPage.DisplayAlert(
"Error",
connection.Message,
"Accept");
await Application.Current.MainPage.Navigation.PopAsync();
return;
}
var response = await this.apiService.GetList<Land>(
"url Base",
"prefix",
"Controller");
if (!response.IsSuccess)
{
this.IsRefreshing = false;
await Application.Current.MainPage.DisplayAlert(
"Error",
response.Message,
"Accept"
);
return;
}
var list = (List<Land>)response.Result;
this.Lands = new ObservableCollection<Land>(list);
this.IsRefreshing = false;
}
public ICommand RefreshCommand
{
get
{
return new RelayCommand(LoadLand);
}
}
}
Here is the View
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="ARLAPP.Views.ConsultaPage"
BackgroundColor="White"
BindingContext="{Binding Main, Source={StaticResource Locator}}"
Title="Lands">
<ContentPage.Content>
<StackLayout
BindingContext="{Binding Lands}"
Padding="5">
<StackLayout>
<Image
VerticalOptions="Center"
WidthRequest="300"
Source="UserIcon"
BackgroundColor="Transparent"/>
<Label Text="Mark"
VerticalOptions="Center"
HorizontalOptions="CenterAndExpand"
FontAttributes="Bold"
FontSize="Medium"/>
</StackLayout>
<StackLayout>
<ListView
SeparatorVisibility="Default"
FlowDirection="LeftToRight"
BackgroundColor="White"
ItemsSource="{Binding Lands}"
HasUnevenRows="True">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Label
Grid.Column="2"
VerticalOptions="Center"
TextColor="Black"
Text="{Binding Currency}"/>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
</StackLayout>
</ContentPage.Content>
</ContentPage>
Here how I call the view
if (this.PageName == "Lands")
{
MainViewModel.GetInstance().Lands= new LandViewModel();
Application.Current.MainPage = new LandMasterPage();
}

Answer 1

Check your BindingContext. I think you are setting it wrong in your view.
In your top-level StackLayout you set the the BindingContext to your property: BindingContext="{Binding Lands}". And in your ListView you set the ItemsSource also to this property: ItemsSource="{Binding Lands}". That won't work because the ListView is trying to bind to a property Lands inside your BindingContext, which is also set to Lands.
Remove the BindingContext from your top-level StackLayout, because you don't need it.
Ensure the BindingContext of your page ConsultaPage is set to your view-model DatosMedicosViewModel.
Sample of setting the bindingcontext (abstract code):
var mypage = new ConsultaPage();
mypage.BindingContext = new DatosMedicosViewModel();
await Navigation.PushAsync(mypage);
// Load your data in OnAppearing() of the page-event
This should solve your binding-problem.
Side-Note: As Abdul Gani said in the comments: Ensure you implement the INotifyPropertyChanged interface, but I assume you do this already in your BaseViewModel and call the NotifyChanged-Event in your SetValue-Method.