【C# 进阶】事件！直接上事件！

http://www.tracefact.net/csharp-programming/delegates-and-events-in-csharp.aspx

ZiYang 张，何许人也？看了他写的博客，基本看明白了，就有一句不明白，不过以后再慢慢明白~

事件，卡住了多少英雄好汉向C#继续深入？

对委托的封装！弄清

谁发布消息？

谁订阅消息？消息里传递什么信息给观察者？

收到消息要干哈？

不说他提到的水壶例子了。我想了一个模型，不知道能否实现。

我们的微软客户小吴发布测试的任务消息，我们的测试小队长超超订阅这个消息，背后的大boss小马也订阅这个消息。

小队长超超接收消息后，会向他的队友——我们，发布这个消息，让我们开始干活~

　　二级事件。。。我觉得是，不过我没写过。我们订阅超超的有任务消息，我们收到该消息，会开始做该任务。

大Boss小马收到该消息，会回复一声，我知道了，测试小队做了这个任务呀~

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

namespace VenderTest
{
    class Program
    {
        static void Main(string[] args)
        {
            Customer vsCustomer = new Customer();

            vsCustomer.Name = "Wu";
            vsCustomer.SentTasks += (new TeamLead() { Name = "Chao" }).ForwardCustomerTask;
            vsCustomer.SentTasks += (new Boss() { Name = "Ma" }).ReplyTeamTask;
            vsCustomer.MakeTestPlan(5, 2);

        }
    }
    public abstract class Person
    {
        public string Name { get; set; }
        public virtual void Introduction()
        {
            Console.WriteLine("Hello, my name is {0}", Name);
        }
    }
    public class Customer : Person
    {
        private string TaskName;
        public delegate void SendTaskEventHandler(Object sender, SendTaskEventArgs e);
        public event SendTaskEventHandler SentTasks;
        public class SendTaskEventArgs : EventArgs
        {
            public readonly string taskMessage;
            public readonly DateTime ETA;
            public SendTaskEventArgs(string task, DateTime deadline)
            {
                this.taskMessage = task;
                this.ETA = deadline;
            }
        }
        public virtual void OnSentTasks(SendTaskEventArgs e)
        {
            SentTasks?.Invoke(this, e);
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="TaskCount"></param>
        /// <param name="TaskInterval">Unit: Days</param>
        public void MakeTestPlan(int TaskCount, int TaskInterval)
        {
            Introduction();
            Console.WriteLine("I'm making test plans.");
            Console.WriteLine();
            for (int i = 1; i <=  TaskCount; i++)
            {
                TaskName = "Testing Gallery:" + i.ToString();
                DateTime dl = DateTime.Now.AddDays(i * TaskInterval);
                SendTaskEventArgs args = new SendTaskEventArgs(TaskName, dl);
                OnSentTasks(args);
            }

        }
        public override void Introduction()
        {
            Console.WriteLine("Hello, I'm a vendor customer. My name is {0}", Name);

        }
    }
    public class TeamLead :Person
    {
        public override void Introduction()
        {
            Console.WriteLine("Hello, I'm a vendor test lead. My name is {0}", Name);
        }
        public void ForwardCustomerTask(Object sender, Customer.SendTaskEventArgs e)
        {
            Introduction();
            Customer customer = (Customer)sender;
            Console.WriteLine("Got a task from the customer: {0}", customer.Name);
            //Get information from the event message.
            Console.WriteLine("The task name is {0}", e.taskMessage);
            Console.WriteLine("The task deadline is {0}", e.ETA);
            Console.WriteLine();

        }
    }
    public class Boss:Person
    {
        private static List<string> tasks = new List<string>();
        public override void Introduction()
        {
            Console.WriteLine("Hello, I'm the manager of vendor team. My name is {0}", Name);
        }
        public void ReplyTeamTask(Object sender,Customer.SendTaskEventArgs e)
        {
            Introduction();
            Customer customer = (Customer)sender;
            Console.WriteLine("OK, {0}. Let's review what they got recently:", customer.Name);
            tasks.Add(e.taskMessage);
            foreach(var task in tasks)
            {
                Console.WriteLine(task);
            }
            Console.WriteLine("Vendors did a lot of tasks. Consider cut some tasks next month.");
            Console.WriteLine();

        }
    }

}