UUID v7 coming in .NET 9

UUID v7 coming in .NET 9

For those that didn’t know, you can create Guids in different ways (algorithms).

System.Guid supports UUID v4 out-of-the-box, the most used version.

UUID v7 is now added, which creates Guids based on the current time. This means Guids can be sorted, which is more index friendly for databases (=faster).

SQL Server already has the alternative NEWSEQUENTIALID() for ages to fix the sorting problem in the database.

But now .NET 9 will natively support UUID v7, complete with timestamps!

You can create Guids as UUID v4 using the new CreateVersion7() method:

𝚟𝚊𝚛 𝚐𝚞𝚒𝚍𝟷 = 𝙶𝚞𝚒𝚍.𝙲𝚛𝚎𝚊𝚝𝚎𝚅𝚎𝚛𝚜𝚒𝚘𝚗𝟽();

𝚟𝚊𝚛 𝚐𝚞𝚒𝚍𝟷 = 𝙶𝚞𝚒𝚍.𝙲𝚛𝚎𝚊𝚝𝚎𝚅𝚎𝚛𝚜𝚒𝚘𝚗𝟽(𝙳𝚊𝚝𝚎𝚃𝚒𝚖𝚎𝙾𝚏𝚏𝚜𝚎𝚝.𝚄𝚝𝚌𝙽𝚘𝚠);

Now you can created sorted Guids in .NET!