Guid.Parse() or new Guid() - What's the difference?

Question

What is the difference between these two ways of converting a string to System.Guid? Is there a reason to choose one over the other?

var myguid          


        

Answer 1

I tried performance on one milion guids and Guid.Parse seems to be a insignificantly faster. It made 10-20 milisecods difference of 800 miliseconds of total creation on my PC.

public class Program
{
    public static void Main()
    {
        const int iterations = 1000 * 1000;
        const string input = "63559BC0-1FEF-4158-968E-AE4B94974F8E";

        var sw = Stopwatch.StartNew();
        for (var i = 0; i < iterations; i++)
        {
            new Guid(input);
        }
        sw.Stop();

        Console.WriteLine("new Guid(): {0} ms", sw.ElapsedMilliseconds);

        sw = Stopwatch.StartNew();
        for (var i = 0; i < iterations; i++)
        {
            Guid.Parse(input);
        }
        sw.Stop();

        Console.WriteLine("Guid.Parse(): {0} ms", sw.ElapsedMilliseconds);
    }
}

And output:

new Guid(): 804 ms

Guid.Parse(): 791 ms