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　　http://flashview.ddvip.com/2008_11/Enterprise Library2.0.rar　

　　阅读本文之前,请先阅读:Enterprise Library 2.0 -- Logging Application Block (上)

　　上一篇中我们介绍了如何去配置Logging Application Block,本文将主要介绍Logging Application Block 的基本操作以及Formatter和Trace Listeners 的自定义方法，首先我们来看如何将一个事件日志写入到一个文本文件中。

　　假设我们按照上一篇的操作配置了Logging Application Block，那么配置文件中的信息如下：

　 <loggingConfiguration name="Logging Application Block" tracingEnabled="true"
　　defaultCategory="General" logWarningsWhenNoCategoriesMatch="true">
　　<listeners>
　　　<add fileName="trace.log" header="----------------------------------------"
　　　　footer="----------------------------------------" formatter="SHY520 Formatter"
　　　　listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FlatFileTraceListenerData,
　　
Microsoft.Practices.EnterpriseLibrary.Logging, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null"
　　　　traceOutputOptions="None" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.FlatFileTraceListener,
　　
Microsoft.Practices.EnterpriseLibrary.Logging, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null"
　　　　name="SHY520 Listeners" />
　　　<add source="Enterprise Library Logging" formatter="Text Formatter"
　　　　log="Application" machineName="" listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FormattedEventLogTraceListenerData,
　　
Microsoft.Practices.EnterpriseLibrary.Logging, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null"
　　　　traceOutputOptions="None" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.FormattedEventLogTraceListener,
　　
Microsoft.Practices.EnterpriseLibrary.Logging, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null"
　　　　name="Formatted EventLog TraceListener" />
　　</listeners>
　　<formatters>
　　　<add template="Timestamp: {timestamp} Message: {message} Category: {category} Priority: {priority} EventId:
　　
{eventid} Severity: {severity} Title:{title} Machine: {machine} Application Domain: {appDomain} Process Id:
　　
{processId} Process Name: {processName} Win32 Thread Id: {win32ThreadId} Thread Name: {threadName} Extended Properties:
　　
{dictionary({key} - {value} )}"
　　　　type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging, Version=2.0.0.0,
　　
Culture=neutral, PublicKeyToken=null"
　　　　name="Text Formatter" />
　　　<add template="Timestamp: {timestamp} Message: {message} Category: {category} Priority: {priority} EventId:
　　
{eventid} Severity: {severity} Title:{title} Machine: {machine} Application Domain: {appDomain} Process Id:
　　
{processId} Process Name: {processName} Win32 Thread Id: {win32ThreadId} Thread Name: {threadName} Extended Properties:
　　
{dictionary({key} - {value} )}"
　　　　type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging, Version=2.0.0.0,
　　
Culture=neutral, PublicKeyToken=null"
　　　　name="SHY520 Formatter" />
　　</formatters>
　　<logFilters>
　　　<add categoryFilterMode="AllowAllExceptDenied" type="Microsoft.Practices.EnterpriseLibrary.Logging.Filters.CategoryFilter,
　　
Microsoft.Practices.EnterpriseLibrary.Logging, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null"
　　　　name=&quot;Category Filter" />
　　</logFilters>
　　<categorySources>
　　　<add switchValue="All" name="General">
　　　　<listeners>
　　　　　<add name="SHY520 Listeners" />
　　　　</listeners>
　　　</add>
　　</categorySources>
　　<specialSources>
　　　<allEvents switchValue="All" name="All Events" />
　　　<notProcessed switchValue="All" name="Unprocessed Category" />
　　　<errors switchValue="All" name="Logging Errors &amp; Warnings">
　　　　<listeners>
　　　　　<add name="Formatted EventLog TraceListener" />
　　　　</listeners>
　　　</errors>
　　</specialSources>
　</loggingConfiguration>