public static IEnumerable <T> WithProgress <T>(this IEnumerable <T> src, Func <IProgress> progressSelector, TimeSpan?updatePeriod = null)
{
var progress = progressSelector();
progress.Start();
var current = new Boxed(0);
var actualUpdatePeriod = updatePeriod ?? TimeSpan.FromSeconds(1);
var timer = new Timer(o => progress.Update((int)current.Read()), null, actualUpdatePeriod, actualUpdatePeriod);
try
{
foreach (var i in src)
{
current.Increment();
yield return(i);
}
}
finally
{
timer.Dispose();
}
progress.Update((int)current.Read());
}
