private async void CountrySearch_TextChanged(object sender, TextChangedEventArgs e)
{
_cancellationTokenSource?.Cancel();
_cancellationTokenSource = new CancellationTokenSource();
var cancellationToken = _cancellationTokenSource.Token;
try
{
await Task.Delay(500, cancellationToken);
if (cancellationToken.IsCancellationRequested)
{
return;
}
var countries = await Task.Run(async() =>
await FlagService.GetFlagsTask(e.NewTextValue), cancellationToken);
if (cancellationToken.IsCancellationRequested)
{
return;
}
Device.BeginInvokeOnMainThread(() =>
Countries.ReplaceRange(countries));
}
catch (OperationCanceledException)
{
// we cancelled so do nothing... (ugly!)
}
}
private async void CountrySearch_TextChanged(object sender, TextChangedEventArgs e)
{
await Task.Delay(500);
var countries = await FlagService.GetFlagsTask(e.NewTextValue);
Device.BeginInvokeOnMainThread(() =>
Countries.ReplaceRange(countries));
}
//Source: https://byteloom.marek-mierzwa.com/mobile/2018/06/18/search-as-you-type-in-xamarin-forms.html
private async void CountrySearch_TextChanged(object sender, TextChangedEventArgs e)
{
_cancellationTokenSource?.Cancel();
if (e.NewTextValue.Length < 3 && searchTerm == e.NewTextValue)
{
return;
}
_cancellationTokenSource = new CancellationTokenSource();
var cancellationToken = _cancellationTokenSource.Token;
try
{
await Task.Delay(500, cancellationToken);
searchTerm = e.NewTextValue;
if (cancellationToken.IsCancellationRequested)
{
return;
}
var timeoutTask = Task.Delay(TimeSpan.FromSeconds(30), cancellationToken);
var countriesTask = Task.Run(async() => await FlagService.GetFlagsTask(e.NewTextValue),
cancellationToken);
if (await Task.WhenAny(countriesTask, timeoutTask) == timeoutTask)
{
throw new TimeoutException();
}
if (cancellationToken.IsCancellationRequested)
{
return;
}
var countries = await countriesTask;
Device.BeginInvokeOnMainThread(() =>
Countries.ReplaceRange(countries));
}
catch (OperationCanceledException)
{
// we cancelled so do nothing... (ugly!)
}
catch (TimeoutException timeoutEx)
{
//Handle timeout here...
Console.WriteLine("Timeout!");
}
}
