public Guid GetGuid(GuidTypes guidType)
{
if (mGuidMap.ContainsKey(guidType))
{
return(mGuidMap[guidType]);
}
return(Guid.Empty);
}
private Guid NewGuid(GuidTypes guidType)
{
try
{
using (var random = RandomNumberGenerator.Create())
{
var randomBytes = new byte[10];
random.GetBytes(randomBytes);
var timestamp = DateTime.UtcNow.Ticks / 10000L;
var timestampBytes = BitConverter.GetBytes(timestamp);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(timestampBytes);
}
var bytes = new byte[16];
switch (guidType)
{
case GuidTypes.Oracle:
Buffer.BlockCopy(timestampBytes, 2, bytes, 0, 6);
Buffer.BlockCopy(randomBytes, 0, bytes, 6, 10);
break;
case GuidTypes.Postgres:
case GuidTypes.MySql:
Buffer.BlockCopy(timestampBytes, 2, bytes, 0, 6);
Buffer.BlockCopy(randomBytes, 0, bytes, 6, 10);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(bytes, 0, 4);
Array.Reverse(bytes, 4, 2);
}
break;
case GuidTypes.SqlServer:
Buffer.BlockCopy(randomBytes, 0, bytes, 0, 10);
Buffer.BlockCopy(timestampBytes, 2, bytes, 10, 6);
break;
default:
return(Guid.Empty);
}
return(new Guid(bytes));
}
}
catch
{
return(Guid.Empty);
}
}
