原文推文中有乡民提出用递回函数 但是递回函数会导致堆栈耗尽(stack overflow) 其实可以使用异步方式来避免这种情况 internal class Multip { private AsyncCallback _callback; private MultipAsyncResult _asyncResult; private int[] com; internal void BeginQuestion(AsyncCallback callback, object state) { this._callback = callback; this._asyncResult = new MultipAsyncResult(state); ThreadPool.QueueUserWorkItem(new WaitCallback(this.Question)); } internal int[] EndQuestion(IAsyncResult ar) { return this.com; } private void Question(object obj) { System.Random number = new Random(); int a = number.Next(1, 9); int b = number.Next(1, 9); Console.WriteLine("How much is {0} times {1}?", a, b); int input = Convert.ToInt32(Console.ReadLine()); int ans = a * b; this.com = new int[] { input, ans }; this._callback(this._asyncResult); } internal class MultipAsyncResult : IAsyncResult { private object asyncState; public MultipAsyncResult(object state) { this.asyncState = state; } #region IAsyncResult 成员 public object AsyncState { get { return this.asyncState; } } public System.Threading.WaitHandle AsyncWaitHandle { get { throw new Exception("The method or operation is not im plemented."); } } public bool CompletedSynchronously { get { throw new Exception("The method or operation is not im plemented."); } } public bool IsCompleted { get { throw new Exception("The method or operation is not im plemented."); } } #endregion } } 以上为异步class代码,在main函数中使用示例如下 class Program { static AutoResetEvent are = new AutoResetEvent(false); static void Main(string[] args) { Multip mul = new Multip(); mul.BeginQuestion(new AsyncCallback(Test), mul); are.WaitOne(); } static void Test(IAsyncResult ar) { Multip mul = ar.AsyncState as Multip; int[] com = mul.EndQuestion(ar); mul.BeginQuestion(new AsyncCallback(Test), mul); } } --

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