Task:用户委托方式

public class Example
{
   public static void Main()
   {
      Thread.CurrentThread.Name = "Main";
      // Create a task and supply a user delegate by using a lambda expression.
      Task taskA = new Task( () => Console.WriteLine("Hello from taskA."));
      // Start the task.
      taskA.Start();
      // Output a message from the calling thread.
      Console.WriteLine("Hello from thread '{0}'.",
                        Thread.CurrentThread.Name);
      taskA.Wait();
   }
}

Task.Run

public class Example
{
   public static void Main()
   {
      Thread.CurrentThread.Name = "Main";
      // Define and run the task.
      Task taskA = Task.Run( () => Console.WriteLine("Hello from taskA."));
      // Output a message from the calling thread.
      Console.WriteLine("Hello from thread '{0}'.",
                          Thread.CurrentThread.Name);
      taskA.Wait();
   }
}

TaskFactory.StartNew