WCF Essentials (7)
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10. 使用通道
我们可以用通道(channel)代替静态代理(svcutil proxy),直接调用服务操作。ChannelFactory<T> 允许我们在运行时动态创建一个代理与服务进行交互。
public class ContractDescription
{
public Type ContractType {get;set;}
//More members
}
public class ServiceEndpoint
{
public ServiceEndpoint(ContractDescription contract, Binding binding, EndpointAddress address);
public EndpointAddress Address {get;set;}
public Binding Binding {get;set;}
public ContractDescription Contract {get;}
//More members
}
public abstract class ChannelFactory : ...
{
public ServiceEndpoint Endpoint {get;}
//More members
}
public class ChannelFactory<T> : ChannelFactory,...
{
public ChannelFactory(ServiceEndpoint endpoint);
public ChannelFactory(string configurationName);
public ChannelFactory(Binding binding, EndpointAddress endpointAddress);
public static T CreateChannel(Binding binding, EndpointAddress endpointAddress);
public T CreateChannel( );
//More Members
}
{
public Type ContractType {get;set;}
//More members
}
public class ServiceEndpoint
{
public ServiceEndpoint(ContractDescription contract, Binding binding, EndpointAddress address);
public EndpointAddress Address {get;set;}
public Binding Binding {get;set;}
public ContractDescription Contract {get;}
//More members
}
public abstract class ChannelFactory : ...
{
public ServiceEndpoint Endpoint {get;}
//More members
}
public class ChannelFactory<T> : ChannelFactory,...
{
public ChannelFactory(ServiceEndpoint endpoint);
public ChannelFactory(string configurationName);
public ChannelFactory(Binding binding, EndpointAddress endpointAddress);
public static T CreateChannel(Binding binding, EndpointAddress endpointAddress);
public T CreateChannel( );
//More Members
}
我们需要从配置文件中获取一个端点配置名称,将其提交给 ChannelFactory<T>构造方法,也可以直接使用相应的绑定和地址对象作为参数。然后,调用 CreateChannel()方法获取动态生成代理对象的引用。有两种方法关闭代理,将通道转型成 IDisposable,并调用 Dispose() 方法关闭代理;或者转型成ICommunicationObject,调用 Close() 方法。
ChannelFactory<IMyContract> factory = new ChannelFactory<IMyContract>( );
IMyContract proxy1 = factory.CreateChannel( );
using(proxy1 as IDisposable)
{
proxy1.MyMethod( );
}
IMyContract proxy2 = factory.CreateChannel( );
proxy2.MyMethod( );
ICommunicationObject channel = proxy2 as ICommunicationObject;
Debug.Assert(channel != null);
channel.Close( );
IMyContract proxy1 = factory.CreateChannel( );
using(proxy1 as IDisposable)
{
proxy1.MyMethod( );
}
IMyContract proxy2 = factory.CreateChannel( );
proxy2.MyMethod( );
ICommunicationObject channel = proxy2 as ICommunicationObject;
Debug.Assert(channel != null);
channel.Close( );
注: 通道对象除了实现服务契约接口外,还实现了 System.ServiceModel.IClientChannel。
public interface IClientChannel : IContextChannel, IChannel, ICommunicationObject, IDisposable ...
{
}
{
}
除创建 ChannelFactory<T> 对象实例外,我们还可以直接使用静态方法 CreateChannel() 来创建代理。不过这需要我们提供端点地址和绑定对象。
Binding binding = new NetTcpBinding( );
EndpointAddress address = new EndpointAddress("net.tcp://localhost:8000");
IMyContract proxy = ChannelFactory<IMyContract>.CreateChannel(binding, address);
using(proxy as IDisposable)
{
proxy1.MyMethod( );
}
EndpointAddress address = new EndpointAddress("net.tcp://localhost:8000");
IMyContract proxy = ChannelFactory<IMyContract>.CreateChannel(binding, address);
using(proxy as IDisposable)
{
proxy1.MyMethod( );
}
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