化零为整WCF(4) - 异常处理 - 星辰.Net技术社区论坛

化零为整WCF(4) - 异常处理

时间: 2008-03-21 10:26

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化零为整WCF(4) - 异常处理(Exception、FaultException、FaultException<T>、IErrorHandler)

作者：webabcd

介绍
WCF(Windows Communication Foundation)，异常处理，一般Exception的处理，FaultException和FaultException<T>的抛出和处理，使用IErrorHandler处理异常

示例
1、服务
IHello.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ServiceModel;

namespace WCF.ServiceLib.Exception

{

/**////
<summary>

/// IHello接口

///
</summary>

[ServiceContract]

public
interface IHello

{

/**////
<summary>

/// 抛出Exception异常

///
</summary>

[OperationContract]

void HelloException();

/**////
<summary>

/// 抛出FaultException异常

///
</summary>

[OperationContract]

void HelloFaultException();

/**////
<summary>

/// 抛出FaultException<T>异常

///
</summary>

[OperationContract]

[FaultContract(typeof(FaultMessage))]

void HelloFaultExceptionGeneric();

/**////
<summary>

/// IErrorHandler处理异常

///
</summary>

[OperationContract]

void HelloIErrorHandler();

}

}

FaultMessage.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ServiceModel;

using System.Runtime.Serialization;

namespace WCF.ServiceLib.Exception

{

/**////
<summary>

/// 错误信息实体类（用于错误契约FaultContract）

///
</summary>

[DataContract]

public
class FaultMessage

{

/**////
<summary>

/// 错误信息

///
</summary>

[DataMember]

public
string Message

{ get; set; }

/**////
<summary>

/// 错误代码

///
</summary>

[DataMember]

public
int ErrorCode

{ get; set; }

}

}

FaultErrorHandler.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ServiceModel.Dispatcher;

using System.Configuration;

using System.ServiceModel;

using System.ServiceModel.Channels;

namespace WCF.ServiceLib.Exception

{

/**////
<summary>

/// 自定义错误处理器（继承自System.ServiceModel.Dispatcher.IErrorHandler）

///
</summary>

public
class FaultErrorHandler : IErrorHandler

{

/**////
<summary>

/// 在异常返回给客户端之后被调用

///
</summary>

///
<param name="error">异常</param>

///
<returns></returns>

public
bool HandleError(System.Exception error)

{

System.IO.StreamWriter sw =
new System.IO.StreamWriter(@"C:\WCF_Log.txt", true);

sw.Write("IErrorHandler - HandleError测试。错误类型：{0}；错误信息：{1}", error.GetType().ToString(), error.Message);

sw.WriteLine();

sw.Flush();

sw.Close();

// true - 已处理

return
true;

}

/**////
<summary>

/// 在异常发生后，异常信息返回前被调用

///
</summary>

///
<param name="error">异常</param>

///
<param name="version">SOAP版本</param>

///
<param name="fault">返回给客户端的错误信息</param>

public
void ProvideFault(System.Exception error, System.ServiceModel.Channels.MessageVersion version, ref System.ServiceModel.Channels.Message fault)

{

if (error is System.IO.IOException)

{

FaultException ex =
new FaultException("IErrorHandler - ProvideFault测试");

MessageFault mf = ex.CreateMessageFault();

fault = Message.CreateMessage(version, mf, ex.Action);

// InvalidOperationException error = new InvalidOperationException("An invalid operation has occurred.");

// MessageFault mfault = MessageFault.CreateFault(new FaultCode("Server", new FaultCode(String.Format("Server.{0}", error.GetType().Name))), new FaultReason(error.Message), error);

// FaultException fe = FaultException.CreateFault(mfault, typeof(InvalidOperationException));

}

}

Hello.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ServiceModel;

using System.ServiceModel.Description;

using System.ServiceModel.Dispatcher;

namespace WCF.ServiceLib.Exception

{

/**////
<summary>

/// Hello类

///
</summary>

public
class Hello : IHello, IDisposable, IServiceBehavior

{

/**////
<summary>

/// 抛出Exception异常

///
</summary>

public
void HelloException()

{

throw
new System.Exception("抛出Exception异常");

}

/**////
<summary>

/// 抛出FaultException异常

///
</summary>

public
void HelloFaultException()

{

throw
new FaultException("抛出FaultException异常", new FaultCode("服务"));

}

/**////
<summary>

/// 抛出FaultException<T>异常

///
</summary>

public
void HelloFaultExceptionGeneric()

{

throw
new FaultException<FaultMessage>(new FaultMessage

{ Message =
"抛出FaultException<T>异常", ErrorCode =
-1 }, "为了测试FaultException<T>用的");

}

/**////
<summary>

/// IErrorHandler处理异常

///
</summary>

public
void HelloIErrorHandler()

{

throw
new System.IO.IOException("抛出异常，用IErrorHandler处理");

}

/**////
<summary>

/// 实现IDisposable接口的Dispose()方法

///
</summary>

public
void Dispose()

{

}

/**////
<summary>

/// 为契约增加自定义绑定参数

///
</summary>

///
<param name="serviceDescription">服务描述</param>

///
<param name="serviceHostBase">服务宿主</param>

///
<param name="endpoints">服务端点</param>

///
<param name="bindingParameters">需要增加的自定义绑定参数</param>

public
void AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, System.Collections.ObjectModel.Collection<ServiceEndpoint> endpoints, System.ServiceModel.Channels.BindingParameterCollection bindingParameters)

{

}

/**////
<summary>

/// runtime时修改属性值或增加自定义扩展对象

///
</summary>

///
<param name="serviceDescription">服务描述</param>

///
<param name="serviceHostBase">服务宿主</param>

public
void ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)

{

IErrorHandler handler =
new FaultErrorHandler();

foreach (ChannelDispatcher dispatcher in serviceHostBase.ChannelDispatchers)

{

// 增加错误处理器

dispatcher.ErrorHandlers.Add(handler);

}

/**////
<summary>

/// 检查服务描述和服务宿主，以确认服务可以成功运行

///
</summary>

///
<param name="serviceDescription">服务描述</param>

///
<param name="serviceHostBase">服务宿主</param>

public
void Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)

{

}

2、宿主
Hello.svc

@ ServiceHost Language="C#" Debug="true" Service="WCF.ServiceLib.Exception.Hello"
%>

Web.config

<?xml version="1.0"?>

<system.serviceModel>

<se