关于回调函数执行的线程

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

namespace ConsoleApplication1
{
 class Program
 {
 public delegate void PrintCallback(int i);
 static void Main(string[] args)
 {

PrintCallback pcb = new PrintCallback(Print);
 for (int i = 0; i < 1000; i++)
 {
   ExcetCallback(pcb, i);
   Console.WriteLine("主线程;线程ID为" + System.AppDomain.GetCurrentThreadId());
 }
 }

public static void ExcetCallback(PrintCallback pcb,int i)
 {
   pcb(i);
 }
 public static void Print(int i)
 {
 Console.WriteLine("第" + i + "次执行回调;线程ID为" + System.AppDomain.GetCurrentThreadId());
 Thread.Sleep(10000);//10s
 }

}
}