How to Binding Result from ViewModel in Xamarin

Issue

I have 1 question here: How to get data from ViewModel in Xamarin, however I still haven't solved the problem. I created a new post with some changes.

I have:

1. PageOne.xaml

    <StackLayout>
         <RefreshView x:DataType="locals:ViewCustomerViewModel" Command="{Binding LoadUserinfoCommand}" IsRefreshing="{Binding IsBusy, Mode=OneWay}">
              <Label Text="{Binding Customer.Address}" />
         </RefreshView>
    </StackLayout>
   

2. PageOne.xaml.cs

     ViewCustomerViewModel viewCustomerViewModel;
     public Customer CustomerGet { get; set; }
     public PageOne()
     {
        InitializeComponent();
        BindingContext = viewCustomerViewModel = new ViewCustomerViewModel();
        viewCustomerViewModel.OnAppearing();
     }
   

3. Class Customer

    public class Customer
    {
       public string Address{ get; set; }
       ........
    }
   

4. ViewCustomerViewModel

    public class ViewCustomerViewModel:BaseCustomerViewModel
    {
       ApiServiceUserinfo apiServiceUserinfo = new ApiServiceUserinfo();
       public Command LoadUserinfoCommand { get; }
       public ObservableCollection<Customer> CustomerInfos { get; set; }
       public ViewCustomerViewModel()
       {
          LoadUserinfoCommand = new Command(async () => await ExecuteLoadUserinfoCommand());
          CustomerInfos = new ObservableCollection<Customer>();
       }
   
       public void OnAppearing()
       {
          IsBusy = true;
       }
   
       async Task ExecuteLoadUserinfoCommand()
       {
          string userget = "1";
   
          IsBusy = true;
   
          try
          {
            CustomerInfos.Clear();
            var customerList = await apiServiceUserinfo.GetCustomersInfo(userget);
            CustomerInfos.Add(customerList);
          }
          catch (Exception)
          {
            throw;
          }
          finally
          {
            IsBusy = false;
          }
       }
    }
   

And I got the result CustomerInfos.Add(customerList);

However <Label Text="{Binding Customer.Address}" /> does not get results

Please help me again clearly in the answer. Thank you.

Update

4. ViewCustomerViewModel

    public class ViewCustomerViewModel:BaseCustomerViewModel
    {
       ApiServiceUserinfo apiServiceUserinfo = new ApiServiceUserinfo();
       public Command LoadUserinfoCommand { get; set;}
   
       public Customer CustomerGets { get; set;}--> update
   
       public ViewCustomerViewModel()
       {
          LoadUserinfoCommand = new Command(async () => await ExecuteLoadUserinfoCommand());
          //CustomerGets = new Customer();
       }
   
       public void OnAppearing()
       {
          IsBusy = true;
       }
   
       async Task ExecuteLoadUserinfoCommand()
       {
          string userget = "1";
   
          IsBusy = true;
   
          try
          {
            var customerList = await apiServiceUserinfo.GetCustomersInfo(userget);
            CustomerGets = customerList;
          }
          catch (Exception)
          {
            throw;
          }
          finally
          {
            IsBusy = false;
          }
       }
    }
   

1. PageOne.xaml

   <StackLayout>
      <RefreshView x:DataType="locals:ViewCustomerViewModel" Command="{Binding LoadUserinfoCommand}" IsRefreshing="{Binding IsBusy, Mode=OneWay}">
          <Label Text="{Binding CustomerGets.Address}" />
      </RefreshView>
   </StackLayout>
   

Solution

We need to call the OnPropertyChanged method to notify the change in setter method of the property .

private Customer customerGets;
public Customer CustomerGets { 
  get { return customerGets; }
  set { 
          customerGets = value;
          NotifyPropertyChanged();     //the method is declared in BaseCustomerViewModel 
      }
}

Ensure that BaseCustomerViewModel has implemented INotifyPropertyChanged , something like that

 public class BaseCustomerViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        public void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }

Answered By - ColeX - MSFT