Create an ordered guid

Public static class API {// <summary> // create an ordered guid. /// </Summary> /// <returns> </returns> Public static guid newsequentialguid () {guid result; uuidcreatesequential (out result); return result ;} /// <summary> /// http://stackoverflow.com/questions/211498/is-there-a-net-equalent-to-sql-servers-newsequentialid /// </Summary> /// <Param name = "guid"> </param> /// <returns> </ returns> [dllimport ("rpcrt4.dll ", setlasterror = true)] Private Static extern I NT uuidcreatesequential (Out guid); [obsolete ("this is not ordered and the test failed. ")] // <Summary> // http://snipplr.com/view.php? Codeview & id = 29304 /// </Summary> /// <returns> </returns> Public static guid Newcomb () {byte [] datebytes = bitconverter. getbytes (datetime. now. ticks); byte [] guidbytes = guid. newguid (). tobytearray (); // copy the last six bytes from the date to the last six bytes of the guid array. copy (datebytes, datebytes. length-7, guidbytes, guidbytes. length-7, 6); return New GUID (guidbytes );}}

Test

    [TestFixture]    public class APITest    {        [Test]        public void testUuidCreateSequential()        {            List<Guid> list = new List<Guid>();            for (int i = 0; i < 100; i++)            {                Guid id = API.NewSequentialGuid();                list.Add(id);                Console.WriteLine(id);            }            for (int i = 0; i < list.Count - 1; i++)            {                Assert.Less(list[i], list[i + 1]);            }        }        [Test]        public void testNewComb()        {            List<Guid> list = new List<Guid>();            for (int i = 0; i < 100; i++)            {                Guid id = API.NewComb();                list.Add(id);                Console.WriteLine(id);            }            for (int i = 0; i < list.Count - 1; i++)            {                Assert.Less(list[i], list[i + 1]);            }        }    }