服务端增加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。

C# Code:

 /// <summary>
 /// WCF服务端异常处理器
 /// </summary>
 public class WCF_ExceptionHandler : IErrorHandler
 {
    #region IErrorHandler Members

    /// <summary>
    /// HandleError
    /// </summary>
    /// <param name="ex">ex</param>
    /// <returns>true</returns>
    public bool HandleError(Exception ex)
    {
       return true;
    }

    /// <summary>
    /// ProvideFault
    /// </summary>
    /// <param name="ex">ex</param>
    /// <param name="version">version</param>
    /// <param name="msg">msg</param>
    public void ProvideFault(Exception ex, MessageVersion version, ref Message msg)
    {
       //
       //在这里处理服务端的消息，将消息写入服务端的日志
       //
       string err = string.Format("调用WCF接口 '{0}' 出错", ex.TargetSite.Name) "，详情：\r\n" ex.Message;
       var newEx = new FaultException(err);

       MessageFault msgFault = newEx.CreateMessageFault();
       msg = Message.CreateMessage(version, msgFault, newEx.Action);
    }

    #endregion
 }

C# Code:

 /// <summary>
 /// WCF服务类的特性
 /// </summary>
 public class WCF_ExceptionBehaviourAttribute : Attribute, IServiceBehavior
 {
    private readonly Type _errorHandlerType;

    public WCF_ExceptionBehaviourAttribute(Type errorHandlerType)
    {
       _errorHandlerType = errorHandlerType;
    }

    #region IServiceBehavior Members

    public void Validate(ServiceDescription description,
    ServiceHostBase serviceHostBase)
    {
    }

    public void AddBindingParameters(ServiceDescription description,
    ServiceHostBase serviceHostBase,
    Collection<ServiceEndpoint> endpoints,
    BindingParameterCollection parameters)
    {
    }

    public void ApplyDispatchBehavior(ServiceDescription description,
    ServiceHostBase serviceHostBase)
    {
       var handler =
       (IErrorHandler)Activator.CreateInstance(_errorHandlerType);

       foreach (ChannelDispatcherBase dispatcherBase in
       serviceHostBase.ChannelDispatchers)
       {
          var channelDispatcher = dispatcherBase as ChannelDispatcher;
          if (channelDispatcher != null)
          channelDispatcher.ErrorHandlers.Add(handler);
       }
    }

    #endregion
 }

使用：

C# Code:

 [ServiceBehavior(IncludeExceptionDetailInFaults = true)]
 [WCF_ExceptionBehaviour(typeof(WCF_ExceptionHandler))]
 public class AccountModuleService : IAccountModuleService
 {

    //code

 }