Compare String.Join and Aggregate()

gistfile1.txt

IEnumerable<string> values = Enumerable.Repeat("Foo", 100);

Stopwatch watch = new Stopwatch();

watch.Start();

Console.WriteLine(String.Join("<br/>", values));

Console.WriteLine("Performance with Join: {0}", watch.Elapsed);
// "Performance with Join: 00:00:00.0001146"

watch.Restart();

Console.WriteLine(values.Aggregate ((x, y) => string.Format("{0}<br/>{1}", x, y)));

Console.WriteLine("Performance with Aggregate: {0}", watch.Elapsed);
// "Performance with Aggregate: 00:00:00.0002650