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

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

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();

/// 抛出FaultException异常

void HelloFaultException();

/// 抛出FaultException<T>异常

[FaultContract(typeof(FaultMessage))]

void HelloFaultExceptionGeneric();

/// IErrorHandler处理异常

void HelloIErrorHandler();

}

FaultMessage.cs

using System.Runtime.Serialization;

/// 错误信息实体类（用于错误契约FaultContract）

[DataContract]

public class FaultMessage

/// 错误信息

[DataMember]

public string Message { get; set; }

/// 错误代码

public int ErrorCode { get; set; }

FaultErrorHandler.cs

using System.ServiceModel.Dispatcher;

using System.Configuration;

using System.ServiceModel.Channels;

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

public class FaultErrorHandler : IErrorHandler

/// 在异常返回给客户端之后被调用

/// <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;

}

/// 在异常发生后，异常信息返回前被调用

/// <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.ServiceModel.Description;

/// Hello类

public class Hello : IHello, IDisposable, IServiceBehavior

public void HelloException()

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

public void HelloFaultException()

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

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");

public void HelloIErrorHandler()

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

/// 实现IDisposable接口的Dispose()方法

public void Dispose()

/// 为契约增加自定义绑定参数

/// <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)

/// runtime时修改属性值或增加自定义扩展对象

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);

/// 检查服务描述和服务宿主，以确认服务可以成功运行

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>

</behavior>

</serviceBehaviors>

</behaviors>

</service>

</services>

</system.serviceModel>

</configuration>

3、客户端

Hello.aspx

<%@ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Hello.aspx.cs"

Inherits="Exception_Hello" Title="异常处理(Exception、FaultException、FaultException<T>、IErrorHandler)" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server">

</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">

<div>

<asp:Label ID="lblMsg" runat="server" />

</div>

<br />

<asp:Button ID="btnHelloException" runat="server" Text="HelloException" OnClick="btnHelloException_Click" />

<asp:Button ID="btnHelloFaultException" runat="server" Text="HelloFaultException"

OnClick="btnHelloFaultException_Click" />

<asp:Button ID="btnHelloFaultExceptionGeneric" runat="server" Text="HelloFaultExceptionGeneric"

OnClick="btnHelloFaultExceptionGeneric_Click" />

<asp:Button ID="btnHelloIErrorHandler" runat="server" Text="HelloIErrorHandler" OnClick="btnHelloIErrorHandler_Click" />

</asp:Content>

Hello.aspx.cs

using System.Collections;

using System.Data;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

public partial class Exception_Hello : System.Web.UI.Page

protected void Page_Load(object sender, EventArgs e)

protected void btnHelloException_Click(object sender, EventArgs e)

ExceptionService.HelloClient proxy = new ExceptionService.HelloClient();

try

proxy.HelloException();

catch (Exception ex)

lblMsg.Text = ex.Message;

finally

try

proxy.Close();

catch (Exception ex)

lblMsg.Text += "<br />" + ex.Message;

protected void btnHelloFaultException_Click(object sender, EventArgs e)

proxy.HelloFaultException();

catch (FaultException ex)

lblMsg.Text = string.Format("错误编码：{0}；错误原因：{1}",

ex.Code.Name,

ex.Reason.ToString());

proxy.Close();

protected void btnHelloFaultExceptionGeneric_Click(object sender, EventArgs e)

proxy.HelloFaultExceptionGeneric();

catch (System.ServiceModel.FaultException<ExceptionService.FaultMessage> ex)

lblMsg.Text = string.Format("错误代码：{0}；错误信息：{1}；错误原因：{2}",

ex.Detail.ErrorCode.ToString(),

ex.Detail.Message,

protected void btnHelloIErrorHandler_Click(object sender, EventArgs e)

proxy.HelloIErrorHandler();

System.ServiceModel.FaultException faultException = ex as System.ServiceModel.FaultException;

if (faultException != null)

lblMsg.Text = string.Format("错误信息：{0}", faultException.Message);

else

lblMsg.Text = ex.ToString();

</client>

运行结果：

单击"btnHelloException"后显示

抛出Exception异常

The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communication because it is in the Faulted state.

单击"btnHelloFaultException"后显示

错误编码：服务；错误原因：抛出FaultException异常

单击"btnHelloFaultExceptionGeneric"后显示

错误代码：-1；错误信息：抛出FaultException异常；错误原因：为了测试FaultException用的

单击"btnHelloIErrorHandler"后显示

错误信息：IErrorHandler - ProvideFault测试

本文转自webabcd 51CTO博客，原文链接：http://blog.51cto.com/webabcd/344112，如需转载请自行联系原作者

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

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