How to get data from ViewModel in Xamarin - xamarin

Question

I have:
public class ViewCustomerViewModel
{
public Customer CustomerInfo { get; set; }
public static string baseUrl = "https://xxxx/Customers/";
public ViewCustomerViewModel()
{
CheckUserinfo();
}
public async void CheckUserinfo()
{
.....
var url = baseUrl;
HttpClient client = new HttpClient();
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", xxx);
string jsonStr = await client.GetStringAsync(url);
var res = JsonConvert.DeserializeObject<Customer>(jsonStr);
CustomerInfo = res;
}
}
CustomerInfo returns oke
I have PageOne.xaml
<ContentPage ...>
<ContentPage.BindingContext>
<locals:ViewCustomerViewModel/>
</ContentPage.BindingContext>
<ContentPage.Content>
<Label Text={Binding xxxx} />
</ContentPage.Content>
</ContentPage>
PageOne.xaml.cs
This is how I get the data to Binding:
public Customer CustomerInfo { get; set; }
public PageOne()
{
InitializeComponent();
BindingContext = new ViewCustomerViewModel();
}
However: in PageOne.xaml page when I <Label Text={Binding xxxx} /> ---> Binding xxxx, I get no value of Customer class.
I was doing something wrong. Please help me how can I display CustomerInfo results. Thank you
Update
PageOne.xaml
<ContentPage ...>
<ContentPage.Content>
<Label Text={Binding xxxx} />
</ContentPage.Content>
</ContentPage>

Answer 1

The problem is that when the constructor completes, the instance is still being asynchronously initialized, and there isn’t an obvious way to determine when the asynchronous initialization has completed.
Instead of calling from the constructor, do it from the page's OnAppearing method, which you can make async.
Or you could change your viewmodel,make a Factory Pattern for it.From the link,there are several methods you could refer to.