Guid Combined, C# - rextester

Guid Combined

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.IO;
using System.Threading;
using System.Threading.Tasks;

namespace Rextester
{
    
    public static class SystemExtensions 
    {
        
        public static byte[] Combine(this byte[] @this, params byte[][] arrays) {
            byte[] rv = new byte[arrays.Sum(a => a.Length) + @this.Length];
            int offset = 0;

Buffer.BlockCopy(@this, 0, rv, offset, @this.Length);
            offset += @this.Length;

foreach (byte[] array in arrays) {
                Buffer.BlockCopy(array, 0, rv, offset, array.Length);
                offset += array.Length;
            }
            return rv;
        }
        
    }
    
    public class Program
    {                
        public static void Main(string[] args)
        {           
            Parallel.For(0, 50, i =>
            {            
                var guidM = Guid.NewGuid().ToString("N").Substring(0, 10);
                Console.WriteLine(guidM);            
            });
            
            Parallel.For(0, 50, i =>
            {            
                var guidM = Guid.NewGuid();
                var guidCombined = Convert.ToBase64String(Guid.NewGuid().ToByteArray().Combine(guidM.ToByteArray())).Substring(0, 10);
                Console.WriteLine(guidCombined);            
            });
        }
    }
}


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