using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { Console.WriteLine("Main ThreadId = " + Thread.CurrentThread.ManagedThreadId); //给委托赋值 Func<long, long> delegateMethod = new Func<long, long>(CalcSum); //异步执行委托,这里把委托本身作为asyncState对象传进去，在回调函数中需要使用委托的EndInvoke来获得结果 delegateMethod.BeginInvoke(200, DoneCallback, delegateMethod); //异步执行委托,抛出异常 delegateMethod.BeginInvoke(10000000000, DoneCallback, delegateMethod); Console.ReadLine(); } //委托回调函数 static void DoneCallback(IAsyncResult asyncResult) { //到这儿委托已经在异步线程中执行完毕 Console.WriteLine("DoneCallback ThreadId = " + Thread.CurrentThread.ManagedThreadId); Func<long, long> method = (Func<long, long>)asyncResult.AsyncState; //委托执行的异常会在EndInvoke时抛出来 try { //使用BeginInvoke时传入委托的EndInvoke获得计算结果，这时候计算结果已经出来了，有异常的话也在这儿抛出来 long sum = method.EndInvoke(asyncResult); Console.WriteLine("sum = {0}",sum); } catch (OverflowException) { Console.WriteLine("运算溢出了"); } } //委托方法 static long CalcSum(long topLimit) { //委托在另一个线程中开始执行 Console.WriteLine("Calc ThreadId = " + Thread.CurrentThread.ManagedThreadId); checked { long result = 0; for (long i = 0; i < topLimit; i++) { result += i; } return result; } } } }来源：https://www.cnblogs.com/lidabo/archive/2012/05/22/2512821.html