二、绑定元素
每一个类型的绑定最重要的就是绑定元素了，每个绑定的功能特性都由绑定元素决定。BasicHttpBinding由用于编码的TextMessageEncodingBindingElement和用于httpp协议传输的HttpTransportBindingElement 构成。
NetTcpBinding由下列绑定元素组成，可以看出NetTcpBinding支持事务、二进制编码、信道安全、底层使用Tcp协议传输。
TransactionFlowBindingElement BinaryMessageEncodingBindingElement WindowsStreamSecurityBindingElement TcpTransportBindingElement
可以通绑定的CreateBindingElements方法获取当前绑定元素。
WSHttpBinding bind = new WSHttpBinding();
foreach (var ele in bind.CreateBindingElements())
{
Console.WriteLine("{0}", ele.GetType().Name);
}
整个绑定模型可以由下面这张图表示：
绑定元素能够创建信道管理器，再由信道管理器创建信道。信道管理器就是前面说到的信道监听器、信道工厂的简称，因为它们都继承自ChannelManagerBase。信道位于最底层，提供对消息的某种功能处理，对消息进行编码、传输是最基本的两种信道。
三、创建自定义信道
myChannelBase，继承信道基类ChannelBase，由一个InnerChannel表示下一个信道。所以方法都是简单输出当前类的名称，并调用下一个信道的方法来实现，本信道是打酱油的，只为看出后续绑定执行流程。
class myChannelBase:ChannelBase
{
public ChannelBase InnerChannel { get; private set; }
public myChannelBase(ChannelManagerBase channelManager, ChannelBase InnerChannel)
: base(channelManager)
{
this.InnerChannel = InnerChannel;
}
public override T GetProperty<T>()
{
print("GetProperty<T>");
return InnerChannel.GetProperty<T>();
}
protected void print(string methodname)
{
Console.WriteLine("{0}:{1}", this.GetType().Name, methodname);
}
protected override void OnAbort()
{
print("OnAbort");
InnerChannel.Abort();
}
protected override IAsyncResult OnBeginClose(TimeSpan timeout, AsyncCallback callback, object state)
{
print("OnBeginClose");
return InnerChannel.BeginClose(timeout, callback, state);
}
protected override IAsyncResult OnBeginOpen(TimeSpan timeout, AsyncCallback callback, object state)
{
print("OnBeginOpen");
return InnerChannel.BeginOpen(timeout, callback, state);
}
protected override void OnClose(TimeSpan timeout)
{
print("OnClose");
InnerChannel.Close(timeout);
}
protected override void OnEndClose(IAsyncResult result)
{
print("OnEndClose");
InnerChannel.EndClose(result);
}
protected override void OnEndOpen(IAsyncResult result)
{
print("OnEndOpen");
InnerChannel.EndOpen(result);
}
protected override void OnOpen(TimeSpan timeout)
{
print("OnOpen");
InnerChannel.Open(timeout);
}
}
myRequestChannel：请求信道，继承myChannelBase，并实现IRequestChannel。构造函数传入信道管理器，以及下一个信道。后面由myChannelFactory创建。
class myRequestChannel:myChannelBase,IRequestChannel
{
public IRequestChannel InnerRequestChannel
{
get
{
return (IRequestChannel)base.InnerChannel;
}
}
public myRequestChannel(ChannelManagerBase channelManager, IRequestChannel InnerRequestChannel)
: base(channelManager, (ChannelBase)InnerRequestChannel)
{
base.print("myRequestChannel()");
}
public IAsyncResult BeginRequest(Message message, TimeSpan timeout, AsyncCallback callback, object state)
{
base.print("BeginRequest(message,timeout,callback,state)");
return InnerRequestChannel.BeginRequest(message, timeout, callback, state);
}
public IAsyncResult BeginRequest(Message message, AsyncCallback callback, object state)
{
base.print("BeginRequest(message,callback,state)");
return InnerRequestChannel.BeginRequest(message, callback, state);
}
public Message EndRequest(IAsyncResult result)
{
base.print("EndRequest(result)");
return InnerRequestChannel.EndRequest(result);
}
public EndpointAddress RemoteAddress
{
get { return InnerRequestChannel.RemoteAddress; }
}
public Message Request(Message message, TimeSpan timeout)
{
base.print("Request(message,timeout)");
return InnerRequestChannel.Request(message, timeout);
}
public Message Request(Message message)
{
base.print("Request(message)");
return InnerRequestChannel.Request(message);
}
public Uri Via
{
get { return InnerRequestChannel.Via; }
}
}
myReplyChannel：回复信到，继承myChannelBase，并实现IReplyChannel。构造函数传入信道管理器，以及下一个信道。后面由myChannelListener创建。
class myReplyChannel:myChannelBase,IReplyChannel
{
public IReplyChannel InnerRepleyChannel
{
get
{
return (IReplyChannel)base.InnerChannel;
}
}
public myReplyChannel(ChannelManagerBase channelManager, IReplyChannel InnerRepleyChannel)
: base(channelManager, (ChannelBase)InnerRepleyChannel)
{
base.print("myReplyChannel()");
}
public IAsyncResult BeginReceiveRequest(TimeSpan timeout, AsyncCallback callback, object state)
{
base.print("BeginReceiveRequest(timeout, callback, state)");
return InnerRepleyChannel.BeginReceiveRequest(timeout, callback, state);
}
public IAsyncResult BeginReceiveRequest(AsyncCallback callback, object state)
{
base.print("BeginReceiveRequest(callback, state)");
return InnerRepleyChannel.BeginReceiveRequest(callback, state);
}
public IAsyncResult BeginTryReceiveRequest(TimeSpan timeout, AsyncCallback callback, object state)
{
base.print("BeginTryReceiveRequest(timeout,callback, state)");
return InnerRepleyChannel.BeginTryReceiveRequest(timeout,callback, state);
}
public IAsyncResult BeginWaitForRequest(TimeSpan timeout, AsyncCallback callback, object state)
{
base.print("BeginWaitForRequest(timeout,callback, state)");
return InnerRepleyChannel.BeginWaitForRequest(timeout, callback, state);
}
public RequestContext EndReceiveRequest(IAsyncResult result)
{
base.print("EndReceiveRequest(result)");
return InnerRepleyChannel.EndReceiveRequest(result);
}
public bool EndTryReceiveRequest(IAsyncResult result, out RequestContext context)
{
base.print("EndTryReceiveRequest(result,out context)");
return InnerRepleyChannel.EndTryReceiveRequest(result, out context);
}
public bool EndWaitForRequest(IAsyncResult result)
{
base.print("EndWaitForRequest(result)");
return InnerRepleyChannel.EndWaitForRequest(result);
}
public EndpointAddress LocalAddress
{
get { return InnerRepleyChannel.LocalAddress; }
}
public RequestContext ReceiveRequest(TimeSpan timeout)
{
base.print("ReceiveRequest(timeout)");
return InnerRepleyChannel.ReceiveRequest(timeout);
}
public RequestContext ReceiveRequest()
{
base.print("ReceiveRequest()");
return InnerRepleyChannel.ReceiveRequest();
}
public bool TryReceiveRequest(TimeSpan timeout, out RequestContext context)
{
base.print("TryReceiveRequest(timeout,out context)");
return InnerRepleyChannel.TryReceiveRequest(timeout, out context);
}
public bool WaitForRequest(TimeSpan timeout)
{
base.print("WaitForRequest(timeout)");
return InnerRepleyChannel.WaitForRequest(timeout);
}
}
四、自定义信道监听器
myChannelListenerBase，自定义的信道监听器基类，最重要的作用就是在构造函数创建下一个信道监听器。
class myChannelListenerBase<TChannel> : ChannelListenerBase<TChannel> where TChannel : class,IChannel
{
public IChannelListener<TChannel> InnreListener
{
get;
private set;
}
public myChannelListenerBase(BindingContext context)
{
InnreListener = context.BuildInnerChannelListener<TChannel>();
}
protected void print(string methodname)
{
Console.WriteLine("{0}:{1}", this.GetType().Name, methodname);
}
protected override TChannel OnAcceptChannel(TimeSpan timeout)
{
print("OnAcceptChannel(timeout)");
return InnreListener.AcceptChannel(timeout);
}
protected override IAsyncResult OnBeginAcceptChannel(TimeSpan timeout, AsyncCallback callback, object state)
{
print("OnBeginAcceptChannel(timeout,callback,state)");
return InnreListener.BeginAcceptChannel(timeout, callback, state);
}
protected override TChannel OnEndAcceptChannel(IAsyncResult result)
{
print("OnEndAcceptChannel(result)");
return InnreListener.EndAcceptChannel(result);
}
protected override IAsyncResult OnBeginWaitForChannel(TimeSpan timeout, AsyncCallback callback, object state)
{
print("OnBeginWaitForChannel(timeout,callback,state)");
return InnreListener.BeginWaitForChannel(timeout, callback, state);
}
protected override bool OnEndWaitForChannel(IAsyncResult result)
{
print("OnEndWaitForChannel(result)");
return InnreListener.EndWaitForChannel(result);
}
protected override bool OnWaitForChannel(TimeSpan timeout)
{
print("OnWaitForChannel(timeout)");
return InnreListener.WaitForChannel(timeout);
}
public override Uri Uri
{
get { return InnreListener.Uri; }
}
protected override void OnAbort()
{
print("OnAbort()");
InnreListener.Abort();
}
protected override IAsyncResult OnBeginClose(TimeSpan timeout, AsyncCallback callback, object state)
{
print("OnBeginClose(timeout,callback,state)");
return InnreListener.BeginClose(timeout, callback, state);
}
protected override IAsyncResult OnBeginOpen(TimeSpan timeout, AsyncCallback callback, object state)
{
print("OnBeginOpen(timeout,callback,state)");
return InnreListener.BeginOpen(timeout, callback, state);
}
protected override void OnClose(TimeSpan timeout)
{
print("OnClose(timeout)");
InnreListener.Close(timeout);
}
protected override void OnEndClose(IAsyncResult result)
{
print("OnEndClose(result)");
InnreListener.EndClose(result);
}
protected override void OnEndOpen(IAsyncResult result)
{
print("OnEndOpen(result)");
InnreListener.EndOpen(result);
}
protected override void OnOpen(TimeSpan timeout)
{
print("OnOpen(timeout)");
InnreListener.Open(timeout);
}
}
myChannelListener，OnAcceptChannel方法中创建三中提到的myReplyChannel。
class myChannelListener<TChannel> : myChannelListenerBase<TChannel> where TChannel : class,IChannel
{
public myChannelListener(BindingContext context)
: base(context)
{
}
protected override TChannel OnAcceptChannel(TimeSpan timeout)
{
print("OnAcceptChannel(timeout)");
IReplyChannel replyCHannel = (IReplyChannel)InnreListener.AcceptChannel(timeout);
return (new myReplyChannel(this, replyCHannel) as TChannel);
}
protected override TChannel OnEndAcceptChannel(IAsyncResult result)
{
print("OnEndAcceptChannel(result)");
IReplyChannel replychannel= InnreListener.EndAcceptChannel(result) as IReplyChannel;
return new myReplyChannel(this, replychannel) as TChannel;
}
}
五、自定信道工厂
myChannelFactoryBase，继承自ChannelFactoryBase，工厂基类，主要作用是创建下一个信道工厂。
class myChannelFactoryBase<TChannel> : ChannelFactoryBase<TChannel>
{
public IChannelFactory<TChannel> InnerFactory
{
get;
private set;
}
protected void print(string methodname)
{
Console.WriteLine("{0}:{1}", this.GetType().Name, methodname);
}
public myChannelFactoryBase(BindingContext context)
{
print("myChannelFactoryBase(context)");
InnerFactory= context.BuildInnerChannelFactory<TChannel>();
}
protected override TChannel OnCreateChannel(EndpointAddress address, Uri via)
{
print("OnCreateChannel(address,via)");
return InnerFactory.CreateChannel(address,via);
}
protected override IAsyncResult OnBeginOpen(TimeSpan timeout, AsyncCallback callback, object state)
{
print("OnBeginOpen(timeout,callback,state)");
return InnerFactory.BeginOpen(timeout, callback, state);
}
protected override void OnEndOpen(IAsyncResult result)
{
print("OnEndOpen(result)");
InnerFactory.EndOpen(result);
}
protected override void OnOpen(TimeSpan timeout)
{
print("OnOpen(timeout)");
InnerFactory.Open(timeout);
}
}
myChannelFactory，自定义信道工厂，创建三中提到的myRequestChannel。
class myChannelFactory<TChannel> : myChannelFactoryBase<TChannel>
{
public myChannelFactory(BindingContext context)
: base(context)
{
print("myChannelFactory(xontext)");
}
protected override TChannel OnCreateChannel(EndpointAddress address, Uri via)
{
print("OnCreateChannel(address,via)");
IRequestChannel requestchannel = (IRequestChannel)InnerFactory.CreateChannel(address, via);
return (TChannel)(object)new myRequestChannel(this,requestchannel);
}
}
六、自定义绑定元素
myBindingElement继承BindingElement基类，通过BuildChannelFactory、BuildChannelListener方法创建myChannelFactory、BuildChannelListener
class myBindingElement:BindingElement
{
protected void print(string methodname)
{
Console.WriteLine("{0}:{1}", this.GetType().Name, methodname);
}
public override IChannelFactory<TChannel> BuildChannelFactory<TChannel>(BindingContext context)
{
print("BuildChannelFactory<TChannel>(BindingContext context)");
return new myChannelFactory<TChannel>(context);
}
public override IChannelListener<TChannel> BuildChannelListener<TChannel>(BindingContext context)
{
print("IChannelListener<TChannel> BuildChannelListener<TChannel>(BindingContext context) where TChannel : class, IChannel");
return new myChannelListener<TChannel>(context);
}
public override BindingElement Clone()
{
return new myBindingElement();
}
public override T GetProperty<T>(BindingContext context)
{
return context.GetInnerProperty<T>();
}
}
七、自定义绑定
经过前面一系列创建，接下来放大招了。myBinding，把自定义绑定元素放在绑定元素集合中的第一个位置。当服务端执行的时候，我们自定义的绑定元素啥都不干，直接调用下一个绑定元素的种种通信对象干活。
public class myBinding:Binding
{
private BindingElement[] binds = new BindingElement[]
{
new myBindingElement(),
new TextMessageEncodingBindingElement(),
new HttpTransportBindingElement()
};
private HttpTransportBindingElement transportbind;
public override BindingElementCollection CreateBindingElements()
{
transportbind = (HttpTransportBindingElement)binds[2];
return new BindingElementCollection(binds);
}
public override string Scheme
{
get { return transportbind.Scheme; }
}
}
八、服务端使用自定义自定义绑定
static void Main(string[] args)
{
using (ServiceHost host = new ServiceHost(typeof(mywcf.Calculator)))
{
host.AddServiceEndpoint(typeof(mywcf.ICalculator), new myBinding(), "http://localhost:4216");
host.Opened += delegate { Console.WriteLine("Service Start!"); };
host.Open();
Console.ReadLine();
}
}
运行一下，控制台输出，可以看到运行步骤。先创建了信道监听器、Open、再创建自定义信道、接着Open、然后进入接受消息状态。这个和前一篇博文代码顺序一致。
九、客户端代码
static void Main(string[] args)
{
ChannelFactory<mywcf.ICalculator> factory = new ChannelFactory<mywcf.ICalculator>(new myBinding(), new EndpointAddress("http://localhost:4216"));
mywcf.ICalculator client = factory.CreateChannel();
Console.WriteLine(client.Add(1, 2));
}
运行客户端输出，创建信道工厂、Open、创建请求信道、Open、Request发送请求。与前一章客户端代码运行顺序一致。
时间： 2024-03-20 04:25:54