WCF技术内幕第6章(2)-优快云博客

本文链接：https://blog.youkuaiyun.com/xufei96/article/details/8687487

本文详细解析了CommunicationObject子类型的实现细节，包括如何通过重写抽象成员来控制对象的打开和关闭过程，并展示了具体的代码示例。

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CommunicationObject子类型

using System;
using System.ServiceModel.Channels;

namespace ConsoleApplication20
{
    class Program
    {
        static void Main(string[] args)
        {
            MyCommunicationObject myCommObject = new MyCommunicationObject();
        }
    }

    class MyCommunicationObject : CommunicationObject
    {
        //Implement abstract member
        protected override TimeSpan DefaultCloseTimeout { get { return TimeSpan.FromSeconds(1); } }
        protected override TimeSpan DefaultOpenTimeout { get { return TimeSpan.FromSeconds(1); } }
        protected override void OnAbort() { }
        protected override IAsyncResult OnBeginClose(TimeSpan timeout, AsyncCallback callback, object state) { return null; }
        protected override IAsyncResult OnBeginOpen(TimeSpan timeout, AsyncCallback callback, object state) { return null; }
        protected override void OnClose(TimeSpan timeout) { }
        protected override void OnEndClose(IAsyncResult result) { }
        protected override void OnEndOpen(IAsyncResult result) { }
        protected override void OnOpen(TimeSpan timeout) { }

        //Implement virtual member
        protected override void OnOpened()
        {
            base.OnOpened();
        }

        protected override void OnOpening()
        {
            base.OnOpening();
        }
    }
}

Open和BeginOpen方法

打开一个CommunicationObject子类型发生的事情：

            MyCommunicationObject myCommObject = new MyCommunicationObject();
            myCommObject.Open();

CommunicationObject：检查状态是否可以转换为Open
MyCommunicationObject：调用虚方法OnOpening
CommunicationObject：激活Opening事件，调用委托方法
MyCommunication：调用OnOpen方法
MyCommunication：调用OnOpened方法
CommunicationObject：状态转换为Opened
CommunicationObject：激活Opened方法，调用委托方法

WCF技术内幕 第6章(2)

WCF技术内幕第6章(2)