IEnumerable to string [duplicate]

Answer 1

Here is a more succinct version of the StringBuilder answer:

return charSequence.Aggregate(new StringBuilder(), (seed, c) => seed.Append(c)).ToString();

I timed this using the same tests that Jeff Mercado used and this was 1 second slower across 1,000,000 iterations on the same 300 character sequence (32-bit release build) than the more explicit:

static string StringBuilderChars(IEnumerable charSequence)
{
    var sb = new StringBuilder();
    foreach (var c in charSequence)
    {
        sb.Append(c);
    }
    return sb.ToString();
}

So if you're a fan of accumulators then here you go.