在上一篇文章的Controller中我们已经看到了，是怎么使用TYExceptionService进行异常的处理与日志记录，本篇文章具体介绍一下TYExceptionService是如使用Enterprise Library 5.0详细的实现。
因为我们的这个系统是面向接口编程的，所以也需要把TYExceptionService注入到Controller，所以也需要一个ITYExceptionService的接口。
ITYExceptionService异常处理服务接口
这个接口中只有一个方法HandleException，接收一个异常对象，一个Dictionary来存非法的属性和一个字符串message自定义的异常信息。
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace TYStudioDemo.Interfaces { public interface ITYExceptionService { string HandleException(Exception exception, Dictionary<string, object> parms, string message); } }
实现类TYExceptionService
详细的说明见代码中的注释
using Microsoft.Practices.EnterpriseLibrary.ExceptionHandling; using System; using System.Collections.Generic; using System.Diagnostics; using System.Linq; using System.Runtime.Serialization; using System.Text; using System.Threading.Tasks; using TYStudioDemo.Interfaces; using TYStudioDemo.Commons; namespace TYStudioDemo.Services { public class TYExceptionService : ITYExceptionService { public string HandleException(Exception exception, Dictionary<string, object> parms, string message) { //穿件我们自己定义的异常类 TYException tyException = new TYException(message, exception); //建立一个StackFrame StackFrame frame = new StackFrame(1, true); //记录抛出异常的文件名，方法名和，行号 tyException.SetErrorProperty(TYException.CurrentFilename, frame.GetFileName()); tyException.SetErrorProperty(TYException.CurrentFunction, frame.GetMethod().Name); tyException.SetErrorProperty(TYException.CurrentLineNumber, frame.GetFileLineNumber().ToString()); // parameters, if present if (parms != null) { foreach (KeyValuePair<string, object> parm in parms) { if (parm.Value != null) { tyException.SetErrorProperty(parm.Key, parm.Value.ToString()); } } } //使用EntityPrise Library记录异常信息，TYStudioPolicy配置在Web.Config文件中 ExceptionPolicy.HandleException(tyException, "TYStudioPolicy"); //返回有好的错误信息到页面 return tyException.Message; } } }
自定义异常类TYException
见代码注释：
using System; using System.Collections.Generic; using System.Linq; using System.Runtime.Serialization; using System.Text; using System.Threading.Tasks; namespace TYStudioDemo.Commons { [Serializable] public class TYException : Exception { //用来记录抛异常的方法，文件名和行号 public static string CurrentFunction = "Function"; public static string CurrentFilename = "Filename"; public static string CurrentLineNumber = "Line Number"; //定义够方法，调用Exception基类的构造方法 public TYException() : base() { } public TYException(string message) : base(message) { } public TYException(string message, System.Exception inner) : base(message, inner) { } protected TYException(SerializationInfo info, StreamingContext context) : base(info, context) { } //键值对的构造方法 //把键值对存入Data,最终通过Enterprise library text foramtter存入数据库中 public TYException(string message, Exception inner, IDictionary<string, string> props) : base(message, inner) { foreach (KeyValuePair<string, string> entry in props) if (!String.IsNullOrEmpty(entry.Key) && props[entry.Key] != null) Data[entry.Key] = entry.Key; } //获得错误属性值 public string GetErrorProperty(string key) { return (Data[key] == null) ? string.Empty : Data[key].ToString(); } //添加错误属性值 public void SetErrorProperty(string key, string value) { if (!String.IsNullOrEmpty(key) && value != null) Data[key] = value; } } }
TYStudioDemo.Commons工程，我移除最开始Utilities工程，用这个工程代替了。这里主要放一些公共的类，或者一些工具类。TYException就放在了这里，当然你有好的地方，完全可以放到其他工程。
Enterprise Library配置Web.Config
具体配置内容是由Enterprise Library工具生成的，首先你需要安装Enterprise Library 5.0，下载地址http://entlib./ 。安装完成之后找到安装目录下的C:\Program Files (x86)\Microsoft Enterprise Library 5.0\Bin\EntLibConfig.exe，具体的怎么配置规则不做介绍，可以去网上搜索资料。这里给出一个本系统配置成功之后的截图，和相应的Web.Config代码。点击查看大图
Web.Config文件代码：
<?xml version="1.0" encoding="utf-8"?> <!-- For more information on how to configure your ASP.NET application, please visit http://go.microsoft.com/fwlink/?LinkId=169433 --> <configuration> <configSections> <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 --> <section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" /> <section name="exceptionHandling" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Configuration.ExceptionHandlingSettings, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" /> <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" /> </configSections> <loggingConfiguration name="" tracingEnabled="true" defaultCategory="Category"> <listeners> <add name="Database Trace Listener" type="Microsoft.Practices.EnterpriseLibrary.Logging.Database.FormattedDatabaseTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging.Database, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Database.Configuration.FormattedDatabaseTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging.Database, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" databaseInstanceName="TYStudioLoggingConnectionString" writeLogStoredProcName="WriteLog" addCategoryStoredProcName="AddCategory" formatter="Text Formatter" traceOutputOptions="None" /> </listeners> <formatters> <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" template="Exception Details:
{dictionary({key} - {value}{newline})} 
Message: {message}{newline}
{newline}
Timestamp: {timestamp}{newline}
Category: {category}{newline}
Priority: {priority}{newline}
EventId: {eventid}{newline}
Severity: {severity}{newline}
Title:{title}{newline}
Machine: {localMachine}{newline}" name="Text Formatter" /> </formatters> <categorySources> <add switchValue="All" name="Category"> <listeners> <add name="Database Trace Listener" /> </listeners> </add> </categorySources> <specialSources> <allEvents switchValue="All" name="All Events"> <listeners> <add name="Database Trace Listener" /> </listeners> </allEvents> <notProcessed switchValue="All" name="Unprocessed Category"> <listeners> <add name="Database Trace Listener" /> </listeners> </notProcessed> <errors switchValue="All" name="Logging Errors & Warnings"> <listeners> <add name="Database Trace Listener" /> </listeners> </errors> </specialSources> </loggingConfiguration> <exceptionHandling> <exceptionPolicies> <add name="TYStudioPolicy"> <exceptionTypes> <add name="All Exceptions" type="System.Exception, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" postHandlingAction="None"> <exceptionHandlers> <add name="Logging Exception Handler" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Logging.LoggingExceptionHandler, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" logCategory="Category" eventId="100" severity="Error" title="Enterprise Library Exception Handling" formatterType="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.TextExceptionFormatter, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling" priority="0" /> </exceptionHandlers> </add> </exceptionTypes> </add> </exceptionPolicies> </exceptionHandling> <connectionStrings> <add name="DefaultConnection" connectionString="Data Source=(LocalDb)\v11.0;Initial Catalog=aspnet-TYStudioDemo.WebUI-20130331202950;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnet-TYStudioDemo.WebUI-20130331202950.mdf" providerName="System.Data.SqlClient" /> <add name="TYEntities" connectionString="metadata=res://*/TYEntities.csdl|res://*/TYEntities.ssdl|res://*/TYEntities.msl;provider=System.Data.SqlClient;provider connection string="data source=localhost;initial catalog=NORTHWND;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" /> <add name="TYStudioLoggingConnectionString" connectionString="Data Source=localhost;Integrated Security=True;Initial Catalog=TYStudio_Logging;Persist Security Info=True;MultipleActiveResultSets=True" providerName="System.Data.SqlClient" /> </connectionStrings> <appSettings> <add key="webpages:Version" value="2.0.0.0" /> <add key="webpages:Enabled" value="false" /> <add key="PreserveLoginUrl" value="true" /> <add key="ClientValidationEnabled" value="true" /> <add key="UnobtrusiveJavaScriptEnabled" value="true" /> </appSettings> <system.web> <compilation debug="true" targetFramework="4.5" /> <httpRuntime targetFramework="4.5" /> <authentication mode="Forms"> <forms loginUrl="~/Account/Login" timeout="2880" /> </authentication> <pages> <namespaces> <add namespace="System.Web.Helpers" /> <add namespace="System.Web.Mvc" /> <add namespace="System.Web.Mvc.Ajax" /> <add namespace="System.Web.Mvc.Html" /> <add namespace="System.Web.Optimization" /> <add namespace="System.Web.Routing" /> <add namespace="System.Web.WebPages" /> <add namespace="TYStudioDemo.DTO" /> </namespaces> </pages> </system.web> <system.webServer> <validation validateIntegratedModeConfiguration="false" /> <handlers> <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" /> <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" /> <remove name="ExtensionlessUrlHandler-Integrated-4.0" /> <add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" /> <add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" /> <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" /> </handlers> </system.webServer> <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <dependentAssembly> <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="1.0.0.0-4.0.0.0" newVersion="4.0.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" /> </dependentAssembly> </assemblyBinding> </runtime> <entityFramework> <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework"> <parameters> <parameter value="v11.0" /> </parameters> </defaultConnectionFactory> </entityFramework> </configuration>
代码上的全都配置好了，现在该是创建数据库的时候了，在安装Enterprise Library的时候，会提示你安装Source选择安装，安装完成之后，我们可以在里面找到数据库的sql文件。天屹在下面的目录里找到了数据库文件，C:\Users\Administrator\Documents\EntLib50Src\Blocks\Logging\Src\DatabaseTraceListener\Scripts\LoggingDatabase.sql,前面系统documents路径根据自己的机器各不相同，自己修改一下。
不知道什么原因，这个默认的数据库和我们的系统不兼容，两个存储过程有问题AddCategory和WriteLog，这两存储过程的参数和mvc内置的有一些出入，所以需要修改一下，下面列出修改的存储过程sql：
AddCategory
USE [TYStudio_Logging] GO /****** Object: StoredProcedure [dbo].[AddCategory] Script Date: 04/06/2013 14:46:20 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO ALTER PROCEDURE [dbo].[AddCategory] -- Add the parameters for the function here @categoryName nvarchar(64), @logID int AS BEGIN SET NOCOUNT ON; DECLARE @CatID INT SELECT @CatID = CategoryID FROM Category WHERE CategoryName = @categoryName IF @CatID IS NULL BEGIN INSERT INTO Category (CategoryName) VALUES(@categoryName) SELECT @CatID = @@IDENTITY END EXEC InsertCategoryLog @CatID, @logID RETURN @CatID END
WriteLog
USE [TYStudio_Logging] GO /****** Object: StoredProcedure [dbo].[WriteLog] Script Date: 04/06/2013 14:48:27 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO /****** Object: Stored Procedure dbo.WriteLog Script Date: 10/1/2004 3:16:36 PM ******/ ALTER PROCEDURE [dbo].[WriteLog] ( @eventID int, @priority int, @severity nvarchar(32), @title nvarchar(256), @timestamp datetime, @machineName nvarchar(32), @AppDomainName nvarchar(512), @ProcessID nvarchar(256), @ProcessName nvarchar(512), @ThreadName nvarchar(512), @Win32ThreadId nvarchar(128), @message nvarchar(1500), @formattedmessage ntext, @LogId int OUTPUT ) AS INSERT INTO [Log] ( EventID, Priority, Severity, Title, [Timestamp], MachineName, AppDomainName, ProcessID, ProcessName, ThreadName, Win32ThreadId, Message, FormattedMessage ) VALUES ( @eventID, @priority, @severity, @title, @timestamp, @MachineName, @AppDomainName, @ProcessID, @ProcessName, @ThreadName, @Win32ThreadId, @message, @formattedmessage) SET @LogId = @@IDENTITY RETURN @LogId
如果你先麻烦天屹的下篇文章会对整系统做一个总结，并且提供整个系统成型的源代码下载，系统的Commons工程里面会有Logging数据库的备份，你恢复一下也是可以的。
Logging数据库异常信息：
最后让我们来看一眼异常被记录到Logging数据库中的样子吧,这里面有详细的异常信息，还有我们自定义的异常信息，一目了然，当然Enterprise Library也提供出现异常发送邮件的功能，你只需要到Web.Config添加相应的配置就可以了，这样出现异常会第一时间发送到你指定的邮件。
exceptionmessaeg
到这里异常处日志记录处理就完成了。
下篇文章天屹将提供整个系统的代码下载，敬请期待。
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