programmation

// https://forums.xamarin.com/discussion/comment/119662/#Comment_119662

public class IconTabbedRenderer : TabbedRenderer
{
    protected override void DispatchDraw(
        global::Android.Graphics.Canvas canvas)
    {
        base.DispatchDraw(canvas);

        SetTabIcons();

programmation

// http://stackoverflow.com/a/14933245

class JobProcessor<TInput, TOutput> : IDisposable
{
    private readonly Func<TInput, TOutput> m_transform;

    // or a custom type instead of Tuple
    private readonly
        BlockingCollection<Tuple<TInput, TaskCompletionSource<TOutput>>>
        m_queue =

programmation

// http://blog.stephencleary.com/2015/04/a-tour-of-task-part-10-promise-tasks.html

public Task<string> GetValueAsync(int key)
{
  string result;
  if (cache.TryGetValue(key, out result))
    return Task.FromResult(result);
  return DoGetValueAsync(key);
}