nosiema, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            // this wont work
            ThisWontWork();
            
            // this will work
            ThisWillWork();
            
            
            //Your code goes here
            Console.WriteLine("Hello, world!");
        }
        
        static void ThisWillWork()
        {
            Task[] t = new Task[3];
            
            for ( int i = 0; i < t.Length; ++i )
            {
                int j = i;
                t[i] = new Task( () => { Print(j); } );
            }
                
            foreach (Task task in t )
            {
               task.Start();
            }
            
            Task.WaitAll(t);   
        }
        
        static void ThisWontWork()
        {
            Task[] t = new Task[3];
            
            for ( int i = 0; i < t.Length; ++i )
            {
                t[i] = new Task( () => { Print(i); } );
            }
                
            foreach (Task task in t )
            {
               task.Start();
            }
            
            Task.WaitAll(t); 
        }
        
        static void Print(int i)
        {
            Console.WriteLine(i);   
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,12 sec, absolute running time: 0,09 sec, cpu time: 0,09 sec, average memory usage: 12 Mb, average nr of threads: 4