The Guid Struct in C#

The Guid struct represents globally unique identifier in C#. The Guid is the 16 byte value and every time it generates a unique value. There are 2128 or 3.4 × 1038 possible unique values available by using Guid.

To generate new Guid value, open Microsoft Visual Studio and Create new console application and add below code.

using System;

namespace CSharpGuid

{

    class Program

    {

        static void Main(string[] args)

        {

            Guid unique = Guid.NewGuid();

            Console.WriteLine(unique.ToString());

            Console.ReadLine();

        }

    }

} 

It generates new unique value, displays as below.

To instantiate the existing value, use one of the constructors as shown below.

    public Guid(byte[] b); // It takes a 16-byte array as input

    public Guid(string g); // It takes a formatted string as input

The Guid is a struct that means value types. So, we can compare two Guid values with equality symbol. We can convert Guid into a byte array by using extension method ToByteArray(). Guid.Empty property returns an empty value. 

 

tags:

guid struct, guid unique
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