WCF服务全局异常处理机制

服务端增加WCF服务全局异常处理机制，任一WCF服务或接口方式出现异常，将统一调用WCF_ExceptionHandler.ProvideFault方法，因此不需要每个方法使用try catch写法。

 1 /// <summary>
 2 /// WCF服务端异常处理器
 3 /// </summary>
 4 public class WCF_ExceptionHandler : IErrorHandler
 5 {
 6    #region IErrorHandler Members
 7
 8    /// <summary>
 9    /// HandleError
10    /// </summary>
11    /// <param name="ex">ex</param>
12    /// <returns>true</returns>
13    public bool HandleError(Exception ex)
14    {
15       return true;
16    }
17
18    /// <summary>
19    /// ProvideFault
20    /// </summary>
21    /// <param name="ex">ex</param>
22    /// <param name="version">version</param>
23    /// <param name="msg">msg</param>
24    public void ProvideFault(Exception ex, MessageVersion version, ref Message msg)
25    {
26       //
27       //在这里处理服务端的消息，将消息写入服务端的日志
28       //
29       string err = string.Format("调用WCF接口 '{0}' 出错", ex.TargetSite.Name) "，详情：\r\n" ex.Message;
30       var newEx = new FaultException(err);
31
32       MessageFault msgFault = newEx.CreateMessageFault();
33       msg = Message.CreateMessage(version, msgFault, newEx.Action);
34    }
35
36    #endregion
37 }
38

 1 /// <summary>
 2 /// WCF服务类的特性
 3 /// </summary>
 4 public class WCF_ExceptionBehaviourAttribute : Attribute, IServiceBehavior
 5 {
 6    private readonly Type _errorHandlerType;
 7
 8    public WCF_ExceptionBehaviourAttribute(Type errorHandlerType)
 9    {
10       _errorHandlerType = errorHandlerType;
11    }
12
13    #region IServiceBehavior Members
14
15    public void Validate(ServiceDescription description,
16    ServiceHostBase serviceHostBase)
17    {
18    }
19
20    public void AddBindingParameters(ServiceDescription description,
21    ServiceHostBase serviceHostBase,
22    Collection<ServiceEndpoint> endpoints,
23    BindingParameterCollection parameters)
24    {
25    }
26
27    public void ApplyDispatchBehavior(ServiceDescription description,
28    ServiceHostBase serviceHostBase)
29    {
30       var handler =
31       (IErrorHandler)Activator.CreateInstance(_errorHandlerType);
32
33       foreach (ChannelDispatcherBase dispatcherBase in
34       serviceHostBase.ChannelDispatchers)
35       {
36          var channelDispatcher = dispatcherBase as ChannelDispatcher;
37          if (channelDispatcher != null)
38          channelDispatcher.ErrorHandlers.Add(handler);
39       }
40    }
41
42    #endregion
43 }
44

使用：

1 [ServiceBehavior(IncludeExceptionDetailInFaults = true)]
2 [WCF_ExceptionBehaviour(typeof(WCF_ExceptionHandler))]
3 public class AccountModuleService : IAccountModuleService
4 {
5
6
7 }