c# 模擬qt的信號和槽的例子

用慣了qt的信號和槽，轉到c#覺得很彆扭。微軟擅長把簡單的東西設計的很複雜。不過吐吐也就習慣了。

下面的例子是一個公司裏面有職員和hr,職員要加薪，發射信號給hr和公司的例子。同時用到了平行傳遞和向上傳遞信號。

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

namespace Delegate_And_Event
{
    public delegate void SalaryComputeEventHander(object sender, MyEventArgs e);

    public class  Company
    {
        public Employee emp1;
        public HumanResource hr1;


        public Company()
        {
            emp1 = new Employee();
            hr1 = new HumanResource();
            emp1.SalaryPromoted += new SalaryComputeEventHander(hr1.SalaryHandler);   //將具 體事件處理函數註冊到事件中
            emp1.SalaryPromoted += new SalaryComputeEventHander(getEmployeeSlot);

        }

        public void getEmployeeSlot(object sender, MyEventArgs e)
        {
            Console.WriteLine("company respone:negtive");
        }

    }
    public class Employee
    {
        public event SalaryComputeEventHander SalaryPromoted;
       
        public  void OnSalaryCompute(MyEventArgs e) //觸發事件的函數
        {
            if (SalaryPromoted != null)
            {
                Console.WriteLine("Employee ask for a promotion to 15000$");
                SalaryPromoted(this, e);
               
            }
        }
    }
    
    public class HumanResource
    {
        //具體的事件處理函數
        public void SalaryHandler(object sender, MyEventArgs e)
        {
            Console.WriteLine("HR response:Salary is {0},already high enough,will not be promoted", e._salary-3000);
        }
    }

    public class MyEventArgs : EventArgs
    {
        public readonly double _salary;
        public MyEventArgs(double salary)
        {
            this._salary = salary;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Company comp1 = new Company();           
            MyEventArgs e = new MyEventArgs(15000);
            comp1.emp1.OnSalaryCompute(e);
            Console.ReadKey();
        }
    }
}