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如何在WCF中使用動態(tài)代理-創(chuàng)新互聯(lián)
這篇文章主要介紹“如何在WCF中使用動態(tài)代理”，在日常操作中，相信很多人在如何在WCF中使用動態(tài)代理問題上存在疑惑，小編查閱了各式資料，整理出簡單好用的操作方法，希望對大家解答”如何在WCF中使用動態(tài)代理”的疑惑有所幫助！接下來，請跟著小編一起來學(xué)習(xí)吧！
一、重構(gòu)前的項目代碼
重構(gòu)前的項目代碼共7層代碼，其中WCF服務(wù)端3層，WCF接口層1層，客戶端3層，共7層
1.服務(wù)端WCF服務(wù)層SunCreate.InfoPlatform.Server.Service
2.服務(wù)端數(shù)據(jù)庫訪問接口層SunCreate.InfoPlatform.Server.Bussiness
3.服務(wù)端數(shù)據(jù)庫訪問實現(xiàn)層SunCreate.InfoPlatform.Server.Bussiness.Impl
4.WCF接口層SunCreate.InfoPlatform.Contract
5.客戶端代理層SunCreate.InfoPlatform.Client.Proxy
6.客戶端業(yè)務(wù)接口層SunCreate.InfoPlatform.Client.Bussiness
7.客戶端業(yè)務(wù)實現(xiàn)層SunCreate.InfoPlatform.Client.Bussiness.Impl
二、客戶端通過動態(tài)代理重構(gòu)
1.實現(xiàn)在攔截器中添加Ticket、處理異常、Close對象
2.客戶端不需要再寫代理層代碼，而使用動態(tài)代理層
3.對于簡單的增刪改查業(yè)務(wù)功能，也不需要再寫業(yè)務(wù)接口層和業(yè)務(wù)實現(xiàn)層，直接調(diào)用動態(tài)代理；對于復(fù)雜的業(yè)務(wù)功能以及緩存，才需要寫業(yè)務(wù)接口層和業(yè)務(wù)實現(xiàn)層
客戶端動態(tài)代理工廠類ProxyFactory代碼(該代碼目前寫在客戶端業(yè)務(wù)實現(xiàn)層)：
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服務(wù)工廠
/// PF是ProxyFactory的簡寫
///
public class PF
{
///
/// 攔截器緩存
///
private static ConcurrentDictionary _interceptors = new ConcurrentDictionary();
///
/// 代理對象緩存
///
private static ConcurrentDictionary _objs = new ConcurrentDictionary();
private static ProxyGenerator _proxyGenerator = new ProxyGenerator();
///
/// 獲取WCF服務(wù)
///
/// WCF接口
public static T Get()
{
Type interfaceType = typeof(T);
IInterceptor interceptor = _interceptors.GetOrAdd(interfaceType, type =>
{
string serviceName = interfaceType.Name.Substring(1); //服務(wù)名稱
ChannelFactory channelFactory = new ChannelFactory(serviceName);
return new ProxyInterceptor(channelFactory);
});
return (T)_objs.GetOrAdd(interfaceType, type => _proxyGenerator.CreateInterfaceProxyWithoutTarget(interfaceType, interceptor)); //根據(jù)接口類型動態(tài)創(chuàng)建代理對象，接口沒有實現(xiàn)類
}
}
} 客戶端攔截器類ProxyInterceptor
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
{
///
/// 攔截器
///
/// 接口
public class ProxyInterceptor : IInterceptor
{
private static ILog _log = LogManager.GetLogger(typeof(ProxyInterceptor));
private ChannelFactory _channelFactory;
public ProxyInterceptor(ChannelFactory channelFactory)
{
_channelFactory = channelFactory;
}
///
/// 攔截方法
///
public void Intercept(IInvocation invocation)
{
//準備參數(shù)
ParameterInfo[] parameterInfoArr = invocation.Method.GetParameters();
object[] valArr = new object[parameterInfoArr.Length];
for (int i = 0; i < parameterInfoArr.Length; i++)
{
valArr[i] = invocation.GetArgumentValue(i);
}
//執(zhí)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 + " 異常", ex);
((IChannel)server).Abort();
}
}
//out和ref參數(shù)處理
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：
Listlist = PF.Get ().GetEscortTaskList();
這里不用再寫try catch，異常在攔截器中處理
三、WCF服務(wù)端通過動態(tài)代理，在攔截器中校驗Ticket、處理異常
服務(wù)端動態(tài)代理工廠類ProxyFactory代碼(代碼中保存動態(tài)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
{
///
/// 動態(tài)代理工廠
///
public class ProxyFactory
{
///
/// 攔截器緩存
///
private static ConcurrentDictionary _interceptors = new ConcurrentDictionary();
///
/// 代理對象緩存
///
private static ConcurrentDictionary _objs = new ConcurrentDictionary();
private static ProxyGenerator _proxyGenerator;
private static ModuleScope _scope;
private static ProxyGenerationOptions _options;
static ProxyFactory()
{
AttributesToAvoidReplicating.Add(typeof(ServiceContractAttribute)); //動態(tài)代理類不繼承接口的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();
//給動態(tài)代理類添加AspNetCompatibilityRequirementsAttribute屬性
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);
//給動態(tài)代理類添加ServiceBehaviorAttribute屬性
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);
}
///
/// 動態(tài)創(chuàng)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)); //根據(jù)接口類型動態(tài)創(chuàng)建代理對象，接口沒有實現(xiàn)類
}
///
/// 保存動態(tài)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);
}
}
} 說明：object _impl = HI.Provider.GetService(impInterfaceType); 這句代碼用于創(chuàng)建數(shù)據(jù)庫訪問層對象，HI是項目中的一個工具類，類似Autofac框架的功能
服務(wù)端攔截器類ProxyInterceptor
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
{
///
/// 攔截器
///
public class ProxyInterceptor : IInterceptor
{
private static ILog _log = LogManager.GetLogger(typeof(ProxyInterceptor));
private object _impl;
public ProxyInterceptor(object impl)
{
_impl = impl;
}
///
/// 攔截方法
///
public void Intercept(IInvocation invocation)
{
//準備參數(shù)
ParameterInfo[] parameterInfoArr = invocation.Method.GetParameters();
object[] valArr = new object[parameterInfoArr.Length];
for (int i = 0; i < parameterInfoArr.Length; i++)
{
valArr[i] = invocation.GetArgumentValue(i);
}
//執(zhí)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 + " 異常", ex);
}
//out和ref參數(shù)處理
for (int i = 0; i < parameterInfoArr.Length; i++)
{
ParameterInfo paramInfo = parameterInfoArr[i];
if (paramInfo.IsOut || paramInfo.ParameterType.IsByRef)
{
invocation.SetArgumentValue(i, valArr[i]);
}
}
}
}
} 服務(wù)端WCF的ServiceHost工廠類：
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工廠類：
<%@ ServiceHost Language="C#" Debug="true" Service="BaseDataService" Factory="SunCreate.InfoPlatform.WinService.MyServiceHostFactory" %>
如何使用自定義的ServiceHost工廠類啟動WCF服務(wù)，下面是部分代碼：
MyServiceHostFactory factory = new MyServiceHostFactory(); ListhostList = 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("出現(xiàn)異常：" + 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()); //用于添加消息攔截器、全局異常攔截器 } host.Open(); m_lsHost.TryAdd(host); } catch (Exception ex) { Console.WriteLine("出現(xiàn)異常：" + ex.Message); m_log.ErrorFormat(ex.Message + ex.StackTrace); } }
WCF服務(wù)端再也不用寫Service層了
四、當(dāng)我需要添加一個WCF接口，以實現(xiàn)一個查詢功能，比如查詢所有組織機構(gòu)，重構(gòu)前，我需要在7層添加代碼，然后客戶端調(diào)用，重構(gòu)后，我只需要在3層添加代碼，然后客戶端調(diào)用
1.在WCF接口層添加接口
2.在服務(wù)端數(shù)據(jù)訪問接口層添加接口
3.在服務(wù)端數(shù)據(jù)訪問實現(xiàn)層添加實現(xiàn)方法
4.客戶端調(diào)用：var orgList = PF.Get
重構(gòu)前，需要在7層添加代碼，雖然每層代碼都差不多，可以復(fù)制粘貼，但是復(fù)制粘貼也很麻煩啊，重構(gòu)后省事多了，從此再也不怕寫增刪改查了
到此，關(guān)于“如何在WCF中使用動態(tài)代理”的學(xué)習(xí)就結(jié)束了，希望能夠解決大家的疑惑。理論與實踐的搭配能更好的幫助大家學(xué)習(xí)，快去試試吧！若想繼續(xù)學(xué)習(xí)更多相關(guān)知識，請繼續(xù)關(guān)注創(chuàng)新互聯(lián)網(wǎng)站，小編會繼續(xù)努力為大家?guī)砀鄬嵱玫奈恼拢?/p>
標題名稱：如何在WCF中使用動態(tài)代理-創(chuàng)新互聯(lián)
轉(zhuǎn)載來于：http://www.dlmjj.cn/article/dooeos.html
