閱讀本文之前,請先閱讀:Enterprise Library 2.0 -- Logging Application Block (上)
上一篇中我們介紹了如何去配置Logging Application Block,本文將主要介紹Logging Application Block 的基本操作以及Formatter和Trace Listeners 的自定義方法，首先我們來看如何將一個事件日志寫入到一個文本文件中。
假設我們按照上一篇的操作配置了Logging Application Block，那麼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="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 & Warnings">
<listeners>
<add name="Formatted EventLog TraceListener" />
</listeners>
</errors>
</specialSources>
</loggingConfiguration>
