uuidv7

C# implementation of UUID version 7 per RFC 9562.

Setup

The Uuidv7 library is available as a NuGet package on the NuGet Gallery. You can install it using the following command with the .NET CLI:

dotnet add package Costasdev.Uuidv7

Alternatively, you can install it using Visual Studio's NuGet Package Manager.

Install-Package Costasdev.Uuidv7

Or you can add it to your project's .csproj file:

<ItemGroup>
	<PackageReference Include="Costasdev.Uuidv7" Version="CHANGEME THE LATEST" />
</ItemGroup>

Basic usage

The following examples demonstrate how to use the Uuidv7 library.

Instantiation

using System;
using Costasdev.Uuidv7;

// Create a new UUID for the current time
var uuid1 = Uuidv7.NewUuid();

// Create a new UUID for a specific DateTime
var dateTime = new DateTime(2024, 06, 13, 10, 08, 15, DateTimeKind.Utc);
var uuid2 = Uuidv7.NewUuid(dateTime);

// Create a new UUID for a specific DateTimeOffset
var dateTimeOffset = new DateTimeOffset(2024, 06, 13, 10, 08, 15, TimeSpan.Zero);
var uuid3 = Uuidv7.NewUuid(dateTimeOffset);

String representation

The Uuidv7 class has the ToString() method, which returns the UUID in lowercase and with hyphens. The AsString() method allows you to customise the output of the UUID, specifying whether it should be in lowercase or uppercase, and whether it should have hyphens or not.

using System;
using Costasdev.Uuidv7;

var uuid = Uuidv7.NewUuid();

// Default ToString() method returns the UUID in lowercase and with hyphens
Console.WriteLine(uuid);
// Output: 7f1b3b6e-7b1b-7f1b-3b6e-7b1b7f1b3b6e

// AsString() method allows you to specify whether the UUID should be in lowercase or uppercase, and whether it should have hyphens
// AsString(bool uppercase, bool hyphens)
Console.WriteLine(uuid2.AsString(true)); // Output: 7F1B3B6E-7B1B-7F1B-3B6E-7B1B7F1B3B6E
Console.WriteLine(uuid2.AsString(false, false)); // Output: 7f1b3b6e7b1b7f1b3b6e7b1b7f1b3b6e

Parsing

Parsing supports both the standard UUID format (with hyphens) and the format without hyphens, as well as both lowercase and uppercase characters.

using System;

const string uuidString = "7f1b3b6e-7b1b-7f1b-3b6e-7b1b7f1b3b6e";

// Parse a UUID from a string
try {
	var uuid = Uuidv7.Parse(uuidString);
} catch (FormatException e) {
	Console.WriteLine(e.Message);
}

// TryParse a UUID from a string, returns a boolean indicating success
var validUuid = Uuidv7.TryParse(uuidString, out var uuid);

if (validUuid) {
	Console.WriteLine(uuid);
} else {
	Console.WriteLine("Invalid UUID");
}

Licence

This project is licenced under the BSD 3-Clause licence. See LICENCE for more information. Essentially, you can do whatever you want with this code, as long as:

1. You give credit to the original author
2. You DO NOT hold them liable for any damages
3. You provide the licence with any derivative works
4. You DO NOT use the author's name to promote any derivative works.