C#之事件源代码

using System;
class CInput
{
    public delegate void UserRequest(object objSender, EventArgs e);
    public event UserRequest OnUserRequest;
    public void Run()
    {
        bool bFinish = false;
        string str;
        do 
        {
            Console.WriteLine("please input string:");
            str = Console.ReadLine();
            if ("h" == str)
            {
                OnUserRequest(this, new EventArgs());
            }
            else if ("exit" == str)
            {
                bFinish = true;
            }
        } while (!bFinish);
    }
}
class CUser
{
    public static void Main()
    {
        CInput objInput = new CInput();
        CUser objUser = new CUser(objInput);
        objInput.Run();
    }
    CUser(CInput objInput)
    {
        //objInput.OnUserRequest += new objInput.UserRequest(ShowMessage); 
        //注意这种写法是错误的，因为委托是静态的
        objInput.OnUserRequest += new CInput.UserRequest(ShowMessage);        
    }
    private void ShowMessage(object objSender, EventArgs e)
    {
        Console.WriteLine("HaHa~~~");
    }
}