如何在WCF中使用动态代理
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一、重构前的项目代码
重构前的项目代码共7层代码，其中WCF服务端3层，WCF接口层1层，客户端3层，共7层
1.服务端WCF服务层SunCreate.InfoPlatform.Server.Service
2.服务端数据库访问接口层SunCreate.InfoPlatform.Server.Bussiness
3.服务端数据库访问实现层SunCreate.InfoPlatform.Server.Bussiness.Impl
4.WCF接口层SunCreate.InfoPlatform.Contract
5.客户端代理层SunCreate.InfoPlatform.Client.Proxy
6.客户端业务接口层SunCreate.InfoPlatform.Client.Bussiness
7.客户端业务实现层SunCreate.InfoPlatform.Client.Bussiness.Impl
二、客户端通过动态代理重构
1.实现在拦截器中添加Ticket、处理异常、Close对象
2.客户端不需要再写代理层代码，而使用动态代理层
3.对于简单的增删改查业务功能，也不需要再写业务接口层和业务实现层，直接调用动态代理；对于复杂的业务功能以及缓存，才需要写业务接口层和业务实现层
客户端动态代理工厂类ProxyFactory代码(该代码目前写在客户端业务实现层)：
using Castle.DynamicProxy;using System;using System.Collections.Concurrent;using System.Collections.Generic;using System.Linq;using System.ServiceModel;using System.Text;using System.Threading.Tasks;namespace SunCreate.InfoPlatform.Client.Bussiness.Imp{ /// <summary> /// WCF服务工厂 /// PF是ProxyFactory的简写 /// </summary> public class PF { /// <summary> /// 拦截器缓存 /// </summary> private static ConcurrentDictionary<Type, IInterceptor> _interceptors = new ConcurrentDictionary<Type, IInterceptor>(); /// <summary> /// 代理对象缓存 /// </summary> private static ConcurrentDictionary<Type, object> _objs = new ConcurrentDictionary<Type, object>(); private static ProxyGenerator _proxyGenerator = new ProxyGenerator(); /// <summary> /// 获取WCF服务 /// </summary> /// <typeparam name="T">WCF接口</typeparam> public static T Get<T>() { Type interfaceType = typeof(T); IInterceptor interceptor = _interceptors.GetOrAdd(interfaceType, type => { string serviceName = interfaceType.Name.Substring(1); //服务名称 ChannelFactory<T> channelFactory = new ChannelFactory<T>(serviceName); return new ProxyInterceptor<T>(channelFactory); }); return (T)_objs.GetOrAdd(interfaceType, type => _proxyGenerator.CreateInterfaceProxyWithoutTarget(interfaceType, interceptor)); //根据接口类型动态创建代理对象，接口没有实现类 } }}客户端拦截器类ProxyInterceptor<T>代码(该代码目前写在客户端业务实现层)：
using Castle.DynamicProxy;using log4net;using SunCreate.Common.Base;using SunCreate.InfoPlatform.Client.Bussiness;using System;using System.Collections.Generic;using System.Linq;using System.Reflection;using System.ServiceModel;using System.ServiceModel.Channels;using System.Text;using System.Threading.Tasks;namespace SunCreate.InfoPlatform.Client.Bussiness.Imp{ /// <summary> /// 拦截器 /// </summary> /// <typeparam name="T">接口</typeparam> public class ProxyInterceptor<T> : IInterceptor { private static ILog _log = LogManager.GetLogger(typeof(ProxyInterceptor<T>)); private ChannelFactory<T> _channelFactory; public ProxyInterceptor(ChannelFactory<T> channelFactory) { _channelFactory = channelFactory; } /// <summary> /// 拦截方法 /// </summary> public void Intercept(IInvocation invocation) { //准备参数 ParameterInfo[] parameterInfoArr = invocation.Method.GetParameters(); object[] valArr = new object[parameterInfoArr.Length]; for (int i = 0; i < parameterInfoArr.Length; i++) { valArr[i] = invocation.GetArgumentValue(i); } //执行方法 T server = _channelFactory.CreateChannel(); using (OperationContextScope scope = new OperationContextScope(server as IContextChannel)) { try { HI.Get<ISecurityBussiness>().AddTicket(); invocation.ReturnValue = invocation.Method.Invoke(server, valArr); var value = HI.Get<ISecurityBussiness>().GetValue(); ((IChannel)server).Close(); } catch (Exception ex) { _log.Error("ProxyInterceptor " + typeof(T).Name + " " + invocation.Method.Name + " 异常", ex); ((IChannel)server).Abort(); } } //out和ref参数处理 for (int i = 0; i < parameterInfoArr.Length; i++) { ParameterInfo paramInfo = parameterInfoArr[i]; if (paramInfo.IsOut || paramInfo.ParameterType.IsByRef) { invocation.SetArgumentValue(i, valArr[i]); } } } }}如何使用：
List<EscortTask> list = PF.Get<IBussDataService>().GetEscortTaskList();这里不用再写try catch，异常在拦截器中处理
三、WCF服务端通过动态代理，在拦截器中校验Ticket、处理异常
服务端动态代理工厂类ProxyFactory代码(代码中保存动态代理dll不是必需的)：
using Autofac;using Castle.DynamicProxy;using Castle.DynamicProxy.Generators;using SunCreate.Common.Base;using System;using System.Collections.Concurrent;using System.Collections.Generic;using System.IO;using System.Linq;using System.Reflection;using System.ServiceModel;using System.ServiceModel.Activation;using System.Text;using System.Threading.Tasks;namespace SunCreate.InfoPlatform.WinService{ /// <summary> /// 动态代理工厂 /// </summary> public class ProxyFactory { /// <summary> /// 拦截器缓存 /// </summary> private static ConcurrentDictionary<Type, IInterceptor> _interceptors = new ConcurrentDictionary<Type, IInterceptor>(); /// <summary> /// 代理对象缓存 /// </summary> private static ConcurrentDictionary<Type, object> _objs = new ConcurrentDictionary<Type, object>(); private static ProxyGenerator _proxyGenerator; private static ModuleScope _scope; private static ProxyGenerationOptions _options; static ProxyFactory() { AttributesToAvoidReplicating.Add(typeof(ServiceContractAttribute)); //动态代理类不继承接口的ServiceContractAttribute String path = AppDomain.CurrentDomain.BaseDirectory; _scope = new ModuleScope(true, false, ModuleScope.DEFAULT_ASSEMBLY_NAME, Path.Combine(path, ModuleScope.DEFAULT_FILE_NAME), "MyDynamicProxy.Proxies", Path.Combine(path, "MyDymamicProxy.Proxies.dll")); var builder = new DefaultProxyBuilder(_scope); _options = new ProxyGenerationOptions(); //给动态代理类添加AspNetCompatibilityRequirementsAttribute属性 PropertyInfo proInfoAspNet = typeof(AspNetCompatibilityRequirementsAttribute).GetProperty("RequirementsMode"); CustomAttributeInfo customAttributeInfo = new CustomAttributeInfo(typeof(AspNetCompatibilityRequirementsAttribute).GetConstructor(new Type[0]), new object[0], new PropertyInfo[] { proInfoAspNet }, new object[] { AspNetCompatibilityRequirementsMode.Allowed }); _options.AdditionalAttributes.Add(customAttributeInfo); //给动态代理类添加ServiceBehaviorAttribute属性 PropertyInfo proInfoInstanceContextMode = typeof(ServiceBehaviorAttribute).GetProperty("InstanceContextMode"); PropertyInfo proInfoConcurrencyMode = typeof(ServiceBehaviorAttribute).GetProperty("ConcurrencyMode"); customAttributeInfo = new CustomAttributeInfo(typeof(ServiceBehaviorAttribute).GetConstructor(new Type[0]), new object[0], new PropertyInfo[] { proInfoInstanceContextMode, proInfoConcurrencyMode }, new object[] { InstanceContextMode.Single, ConcurrencyMode.Multiple }); _options.AdditionalAttributes.Add(customAttributeInfo); _proxyGenerator = new ProxyGenerator(builder); } /// <summary> /// 动态创建代理 /// </summary> public static object CreateProxy(Type contractInterfaceType, Type impInterfaceType) { IInterceptor interceptor = _interceptors.GetOrAdd(impInterfaceType, type => { object _impl = HI.Provider.GetService(impInterfaceType); return new ProxyInterceptor(_impl); }); return _objs.GetOrAdd(contractInterfaceType, type => _proxyGenerator.CreateInterfaceProxyWithoutTarget(contractInterfaceType, _options, interceptor)); //根据接口类型动态创建代理对象，接口没有实现类 } /// <summary> /// 保存动态代理dll /// </summary> public static void Save() { string filePath = Path.Combine(_scope.WeakNamedModuleDirectory, _scope.WeakNamedModuleName); if (File.Exists(filePath)) { File.Delete(filePath); } _scope.SaveAssembly(false); } }}说明：object _impl = HI.Provider.GetService(impInterfaceType); 这句代码用于创建数据库访问层对象，HI是项目中的一个工具类，类似Autofac框架的功能
服务端拦截器类ProxyInterceptor<T>代码：
using Castle.DynamicProxy;using log4net;using SunCreate.Common.Base;using SunCreate.InfoPlatform.Server.Bussiness;using System;using System.Collections.Generic;using System.Linq;using System.Reflection;using System.ServiceModel;using System.ServiceModel.Channels;using System.Text;using System.Threading.Tasks;namespace SunCreate.InfoPlatform.WinService{ /// <summary> /// 拦截器 /// </summary> public class ProxyInterceptor : IInterceptor { private static ILog _log = LogManager.GetLogger(typeof(ProxyInterceptor)); private object _impl; public ProxyInterceptor(object impl) { _impl = impl; } /// <summary> /// 拦截方法 /// </summary> public void Intercept(IInvocation invocation) { //准备参数 ParameterInfo[] parameterInfoArr = invocation.Method.GetParameters(); object[] valArr = new object[parameterInfoArr.Length]; for (int i = 0; i < parameterInfoArr.Length; i++) { valArr[i] = invocation.GetArgumentValue(i); } //执行方法 try { if (HI.Get<ISecurityImp>().CheckTicket()) { Type implType = _impl.GetType(); MethodInfo methodInfo = implType.GetMethod(invocation.Method.Name); invocation.ReturnValue = methodInfo.Invoke(_impl, valArr); } } catch (Exception ex) { _log.Error("ProxyInterceptor " + invocation.TargetType.Name + " " + invocation.Method.Name + " 异常", ex); } //out和ref参数处理 for (int i = 0; i < parameterInfoArr.Length; i++) { ParameterInfo paramInfo = parameterInfoArr[i]; if (paramInfo.IsOut || paramInfo.ParameterType.IsByRef) { invocation.SetArgumentValue(i, valArr[i]); } } } }}服务端WCF的ServiceHost工厂类：
using Spring.ServiceModel.Activation;using System;using System.Collections.Generic;using System.Linq;using System.Reflection;using System.ServiceModel;using System.Text;using System.Threading.Tasks;namespace SunCreate.InfoPlatform.WinService{ public class MyServiceHostFactory : ServiceHostFactory { public MyServiceHostFactory() { } public override ServiceHostBase CreateServiceHost(string reference, Uri[] baseAddresses) { Assembly contractAssembly = Assembly.GetAssembly(typeof(SunCreate.InfoPlatform.Contract.IBaseDataService)); Assembly impAssembly = Assembly.GetAssembly(typeof(SunCreate.InfoPlatform.Server.Bussiness.IBaseDataImp)); Type contractInterfaceType = contractAssembly.GetType("SunCreate.InfoPlatform.Contract.I" + reference); Type impInterfaceType = impAssembly.GetType("SunCreate.InfoPlatform.Server.Bussiness.I" + reference.Replace("Service", "Imp")); if (contractInterfaceType != null && impInterfaceType != null) { var proxy = ProxyFactory.CreateProxy(contractInterfaceType, impInterfaceType); ServiceHostBase host = new ServiceHost(proxy, baseAddresses); return host; } else { return null; } } }}svc文件配置ServiceHost工厂类：
<%@ ServiceHost Language="C#" Debug="true" Service="BaseDataService" Factory="SunCreate.InfoPlatform.WinService.MyServiceHostFactory" %>如何使用自定义的ServiceHost工厂类启动WCF服务，下面是部分代码：
MyServiceHostFactory factory = new MyServiceHostFactory();List<ServiceHostBase> hostList = new List<ServiceHostBase>();foreach (var oFile in dirInfo.GetFiles()){ try { string strSerName = oFile.Name.Replace(oFile.Extension, ""); string strUrl = string.Format(m_strBaseUrl, m_serverPort, oFile.Name); var host = factory.CreateServiceHost(strSerName, new Uri[] { new Uri(strUrl) }); if (host != null) { hostList.Add(host); } } catch (Exception ex) { Console.WriteLine("出现异常：" + ex.Message); m_log.ErrorFormat(ex.Message + ex.StackTrace); }}ProxyFactory.Save();foreach (var host in hostList){ try { foreach (var endpoint in host.Description.Endpoints) { endpoint.EndpointBehaviors.Add(new MyEndPointBehavior()); //用于添加消息拦截器、全局异常拦截器 } host.Open(); m_lsHost.TryAdd(host); } catch (Exception ex) { Console.WriteLine("出现异常：" + ex.Message); m_log.ErrorFormat(ex.Message + ex.StackTrace); }}WCF服务端再也不用写Service层了
四、当我需要添加一个WCF接口，以实现一个查询功能，比如查询所有组织机构，重构前，我需要在7层添加代码，然后客户端调用，重构后，我只需要在3层添加代码，然后客户端调用
1.在WCF接口层添加接口
2.在服务端数据访问接口层添加接口
3.在服务端数据访问实现层添加实现方法
4.客户端调用：var orgList = PF.Get<IBaseDataService>().GetOrgList();
重构前，需要在7层添加代码，虽然每层代码都差不多，可以复制粘贴，但是复制粘贴也很麻烦啊，重构后省事多了，从此再也不怕写增删改查了
到此，关于“如何在WCF中使用动态代理”的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注编程网网站，小编会继续努力为大家带来更多实用的文章！
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