Create multiple threads and wait for all of them to complete

Question

How can I create multiple threads and wait for all of them to complete?

Answer 1

It depends which version of the .NET Framework you are using. .NET 4.0 made thread management a whole lot easier using Tasks:

class Program {     static void Main(string[] args)     {         Task task1 = Task.Factory.StartNew(() => doStuff());         Task task2 = Task.Factory.StartNew(() => doStuff());         Task task3 = Task.Factory.StartNew(() => doStuff());          Task.WaitAll(task1, task2, task3);                 Console.WriteLine("All threads complete");     }      static void doStuff()     {         //do stuff here     } } 

In previous versions of .NET you could use the BackgroundWorker object, use ThreadPool.QueueUserWorkItem(), or create your threads manually and use Thread.Join() to wait for them to complete:

static void Main(string[] args) {     Thread t1 = new Thread(doStuff);     t1.Start();      Thread t2 = new Thread(doStuff);     t2.Start();      Thread t3 = new Thread(doStuff);     t3.Start();      t1.Join();     t2.Join();     t3.Join();      Console.WriteLine("All threads complete"); }