Generate a UUID in C#

C# is one of the more popular programming languages in the world.

Based on Microsoft's .NET framework, C# was first available in 2000. It is a general-purpose, object-oriented, strongly typed programming language that is used in both frontend and backend applications. Because of its relationship to Microsoft's .NET framework, it is most often used in applications that run on Windows.

How to Generate a UUID in C#

The C# language, via the .NET Framework, has built-in support for generating Version 4 UUIDs. Here's an example of how you can create a UUID in C# code.

using System;
using System.Diagnostics;
namespace SampleApplication {
class Program {
static void Main(string[] args) {
Guid myuuid = Guid.NewGuid();
string myuuidAsString = myuuid.ToString();
Debug.WriteLine("Your UUID is: " + myuuidAsString);
}
}
}

Explanation

  • On line #7, we use the System.Guid.NewGuid() static method to create a new Guid instance, stored in the variable, myuuid. In .NET, a GUID (Globally Unique Identifier) is equivalent to a UUID.
  • On line #8, we use the ToString() method to convert the Guid instance to a string. The string representation of a Guid looks like a standard UUID (i.e. 2e63341a-e627-48ac-bb1a-9d56e2e9cc4f). If you're going to store the UUID in a file, database or model property, or send it via an API call to a different application, you'll almost always need the string representation of the myuuid instance, rather than the myuuid instance itself.
  • The output from line #10 will be something like:
    Your UUID is: 2e63341a-e627-48ac-bb1a-9d56e2e9cc4f
    

Convert from a string to a UUID

Although it's rare, in some circumstances you might need to convert from a string representation of a UUID (like the one from line #8 above) back into an instance of Guid.

C# provides for this scenario with a Guid constructor, Guid(string). You can call this method like this:

using System;
using System.Diagnostics;
namespace SampleApplication {
class Program {
static void Main(string[] args) {
Guid myuuid = Guid.NewGuid();
string myuuidAsString = myuuid.ToString();
Guid sameUuid = new Guid(myuuidAsString);
Debug.Assert(sameUuid.Equals(myuuid));
}
}
}

Explanation

  • Line #10 shows converting the string representation of a UUID into a Guid instance (sameUuid) using the Guid(String) constructor method.
  • Line #11 is included to show that the 2 Guid instances are equal.

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The UUIDs generated by this site conform to RFC 4122 whenever possible.
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