.net framework事件设计准则

namespace CSDemos.Model
{
    public delegate void PubEventHandler(object sender,PubEventArgs e);

    public class Publisher
    {
        private string _name;

        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }

        public Publisher(string name) {
            this._name = name;
        }

        public event PubEventHandler PubComputer;
        public event PubEventHandler PubLife;

        //可以让子类重写
        protected virtual void OnPubComputer(PubEventArgs e){  //触发事件
            if (PubComputer != null)
            {
                //以免订阅者事件处理时间过长，发生并发问题。
                PubEventHandler pubComputerTmp = PubComputer;  
                pubComputerTmp(this, e);
            }            
        }

        protected virtual void OnPubLife(PubEventArgs e)
        {  //触发事件
            if (PubLife != null)
            {
                //以免订阅者事件处理时间过长，发生并发问题。
                PubEventHandler pubLifeTmp = PubLife;
                pubLifeTmp(this, e);
            }
        }

        public void DoPubComputer(string magazineName,DateTime dtPubdate) {
            PubEventArgs e = new PubEventArgs(magazineName, dtPubdate);
            OnPubComputer(e);
        }


        public void DoPubLife(string magazineName, DateTime dtPubdate)
        {
            PubEventArgs e = new PubEventArgs(magazineName, dtPubdate);
            OnPubLife(e);
        }

    }
}

 

 

订阅者Subscriber类：

 

 

namespace CSDemos.Model
{
    class Subscriber
    {
        private string _name;
        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }

        public Subscriber(string name)
        {
            this._name = name;
        }

        public void Receive(object sender,PubEventArgs e)
        {

            MessageBox.Show(string.Format("{0}于{1}收到{2}",this.Name,e.PubDate.ToString(),e.Name));

        }
    }
}

 

EventArgs:

namespace CSDemos.Model
{
    public  class PubEventArgs:EventArgs
    {
        private string _name;

        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }
        private DateTime _pubDate;

        public DateTime PubDate
        {
            get { return _pubDate; }
            set { _pubDate = value; }
        }

        public PubEventArgs(string name, DateTime dt)
        {
            this._name = name;
            this._pubDate = dt;
        }

    }
}

Client调用：

            Publisher pub = new Publisher("新华出版社");

            Subscriber subZs = new Subscriber("张三");
            Subscriber subLs = new Subscriber("李四");

            pub.PubComputer += subZs.Receive;
            pub.PubComputer += subLs.Receive;

            pub.PubLife += subZs.Receive;

 

            pub.DoPubComputer("电脑杂志", DateTime.Now);
            pub.DoPubLife("生活杂志", DateTime.Now);