using System;
using System.Runtime.InteropServices;
namespace System
{
internal static class GuidEx
{
[DllImport("rpcrt4.dll", SetLastError = true)]
private static extern int UuidCreateSequential(out Guid guid);
private const int RPC_S_OK = 0;
/// <summary>
/// Generate a new sequential GUID. If UuidCreateSequential fails (or if it generates a "local unique only" guid), fall back on standard random guids.
/// </summary>
/// <returns>A GUID</returns>
public static Guid NewSeqGuid()
{
Guid sequentialGuid;
int hResult = UuidCreateSequential(out sequentialGuid);
if (hResult == RPC_S_OK)
{
return sequentialGuid;
}
else
{
//couldn't create sequential guid, fall back on random guid
return Guid.NewGuid();
}
}
}
}
