这篇文章主要介绍“如何在WCF中使用动态代理”，在日常操作中，相信很多人在如何在WCF中使用动态代理问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”如何在WCF中使用动态代理”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
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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
{
///
/// WCF服务工厂
/// PF是ProxyFactory的简写
///
public class PF
{
///
/// 拦截器缓存
///
private static ConcurrentDictionary _interceptors = new ConcurrentDictionary();
///
/// 代理对象缓存
///
private static ConcurrentDictionary _objs = new ConcurrentDictionary();
private static ProxyGenerator _proxyGenerator = new ProxyGenerator();
///
/// 获取WCF服务
///
/// WCF接口
public static T Get()
{
Type interfaceType = typeof(T);
IInterceptor interceptor = _interceptors.GetOrAdd(interfaceType, type =>
{
string serviceName = interfaceType.Name.Substring(1); //服务名称
ChannelFactory channelFactory = new ChannelFactory(serviceName);
return new ProxyInterceptor(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
{
///
/// 拦截器
///
/// 接口
public class ProxyInterceptor : IInterceptor
{
private static ILog _log = LogManager.GetLogger(typeof(ProxyInterceptor));
private ChannelFactory _channelFactory;
public ProxyInterceptor(ChannelFactory channelFactory)
{
_channelFactory = channelFactory;
}
///
/// 拦截方法
///
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().AddTicket();
invocation.ReturnValue = invocation.Method.Invoke(server, valArr);
var value = HI.Get().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 list = PF.Get().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
{
///
/// 动态代理工厂
///
public class ProxyFactory
{
///
/// 拦截器缓存
///
private static ConcurrentDictionary _interceptors = new ConcurrentDictionary();
///
/// 代理对象缓存
///
private static ConcurrentDictionary _objs = new ConcurrentDictionary();
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);
}
///
/// 动态创建代理
///
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
}
///
/// 保存动态代理dll
///
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
{
///
/// 拦截器
///
public class ProxyInterceptor : IInterceptor
{
private static ILog _log = LogManager.GetLogger(typeof(ProxyInterceptor));
private object _impl;
public ProxyInterceptor(object impl)
{
_impl = impl;
}
///
/// 拦截方法
///
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().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 hostList = new List();
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().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
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