public class KeyboardProcessor
　　{
　　private OnGetLine theFunc = null; //OnGetLine 这个是什么类型的？？？  
　　public OnGetLine OnGetLineCallback {
　　get {
　　return theFunc;
　　}
　　set {
　　theFunc = value;
　　}
　　}
　　public void Run (){
　　// Read input.
　　// If there is any listeners, publish:
　　string s;
　　do {
　　s = Console.ReadLine ();
　　if (s.Length == 0)
　　break;
　　if (theFunc != null){
　　System.Delegate [] funcs =theFunc.GetInvocationList();
　　foreach (OnGetLine f in funcs) {
　　try {
　　f (s);
　　} catch (Exception e) {
　　Console.WriteLine
　　("Caught Exception: ", e.Message);
　　}
　　}
　　}
　　} while (true);

因为没有看到你的全部代码，所以不能确定是什么。
但是根据经验大致判断：OnGetLine很有可能是自定义类
所以，你自己好好看看前后逻辑关系

这个是我从网上看到的  一直纠结这个OnGetLine  
后来这么定义了一下public delegate void OnGetLine(string strFuncName);
  static void Main(string[] args)
     {
                    KeyboardProcessor kp = new KeyboardProcessor();
                    kp.Run();
                    Console.ReadKey();
     }
之后theFunc 总是null  不知道我那个环节出了问题？

问题已解决，谢谢2楼的提议。
原来是少方法的传入。

把我调试可以通过的写下 共享下。。  不对的地方 大家请指出来
            public static void FUN1(string strFuncName){
                Console.WriteLine("Caught Exception1: {0}", strFuncName);
            }
            public static void FUN2(string strFuncName)
            {
                Console.WriteLine("Caught Exception2: {0}", strFuncName);
            }
            public delegate void OnGetLine(string strFuncName);
            public class KeyboardProcessor
            {
                //private  OnGetLine theFunc=null;
                private OnGetLine theFunc = null;
                public OnGetLine OnGetLineCallback
                {
                    get
                    {
                        return theFunc;
                    }
                    set
                    {
                        theFunc = value;
                    }
                }
                public void Run()
                {
                    // Read input.
                    // If there is any listeners, publish:
                    string s;
                    do
                    {
                        s = Console.ReadLine();
                        if (s.Length == 0)
                            break;
                        if (theFunc != null)
                        {
                            System.Delegate[] funcs = theFunc.GetInvocationList();
                            foreach (OnGetLine f in funcs)
                            {
                                try
                                {
                                    f(s);
                                }
                                catch (Exception e)
                                {
                                    Console.WriteLine("Caught Exception: {0}", e.Message);
                                }
                            }
                        }
                    } while (true);
                }
                static void Main(string[] args)
                {
                    KeyboardProcessor kp = new KeyboardProcessor();
                    OnGetLine allfun = null;
                    allfun += FUN1;
                    allfun += FUN2;
                    kp.theFunc = allfun;
                    kp.Run();
                    Console.ReadKey();
                }


            }