Processing Dialog After QR Scan In Xamarin

I'm using QR Code Scanner in Xamarin App, when it scans the qr code, there are some operation it does which takes about a minute, while it's performing operation, I want to show a

Solution 1:

You can use Xamarin.Essentials' MainThread class and more specifically - the InvokeOnMainThreadAsync method. The idea of this method is to not only execute a code on the UI/main thread, but to also to await it's code. This way you can have both async/await logic and main thread execution.

try
{
    // QR Scan Result
    string qr_scan = result.Response;
    var result = JsonConvert.DeserializeObject<QRScan>(qr_scan);
    await MainThread.InvokeOnMainThreadAsync(() => CreateConnection());
}
catch (Exception error)
{ }
finally
{
    // navigate to next page
    await NavigationService.NavigateToAsync<NextViewModel>();
}

Keep in mind that if the method CreateConnection takes a long time to execute, then it would be better to execute on the main thread only the dialog presentation (UserDialogs.Instance.Loading("")).

Solution 2:

Try something like this

Device.BeginInvokeOnMainThread(async () =>
{

    try
    {
        using (UserDialogs.Instance.Loading(("Processing")))
        {
            await Task.Delay(300);
                      
            //Your Service code
        }
    }
    catch (Exception ex)
    {
        var val = ex.Message;
        UserDialogs.Instance.Alert("Test", val.ToString(), "Ok");
    }
});