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c# - 使用自定义 logentry 类和自定义 logformatter

转载 作者:行者123 更新时间:2023-11-30 12:31:17 24 4
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我有一个自定义的 LogEntry 类 - ErrorEntry,它派生自 LogEntry。它有一些公共(public)属性(类对象也是属性之一),我希望在其中放入额外的数据。

public class ErrorEntry : LogEntry
{
public string UserId {get; set; }
public SessionDetail SessionInfo {get; set; }
}

我还有一个自定义格式化程序 - MyFormatter

[ConfigurationElementType(typeof(CustomFormatterData))]
public class MyFormatter : ILogFormatter
{
public MyFormatter(NameValueCollection nvc)
{
//not used
}

public string Format(LogEntry log)
{
string strEntry;
if(log is ErrorEntry)
{
//use properties of ErrorEntry
//populate returnString
}
else
{
throw new ArgumentException("Not supported");
}
return strEntry;
}
}

我已经使用自定义格式化程序设置了 web.config 设置,它工作正常,直到它检查变量是否为 ErrorEntry 类型的语句 - 在这里它永远不会变为 true 并进入 else block 。

我在这里有点困惑 - 我还需要做些什么吗?自定义格式化程序类支持此实现吗?

我正在使用 Enterprise Library 3.1。

最佳答案

如果我扩展 LogFormatter(而不是实现 ILogFormatter)并覆盖 Format(),它对我有用:

[ConfigurationElementType(typeof(CustomFormatterData))]
public class MyFormatter : LogFormatter
{
public MyFormatter(NameValueCollection nvc)
{
//not used
}

public override string Format(LogEntry log)
{
ErrorEntry errorEntry = log as ErrorEntry;

if (errorEntry != null)
{
return "This is the string with the custom values: " + errorEntry.UserId;
//use properties of ErrorEntry
//populate returnString
}

return "Not supported";
}
}

连同此配置:

<?xml version="1.0"?>
<configuration>
<configSections>
<section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings, Microsoft.Practices.EnterpriseLibrary.Logging, Version=3.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
<section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=3.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
</configSections>
<loggingConfiguration name="Logging Application Block" tracingEnabled="true"
defaultCategory="General" logWarningsWhenNoCategoriesMatch="true">
<listeners>
<add fileName="trace.log" header="----------------------------------------"
footer="----------------------------------------" formatter="Custom Formatter"
listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=3.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
traceOutputOptions="None" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.FlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=3.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
name="FlatFile TraceListener" />
</listeners>
<formatters>
<add type="CustomFormatters.MyFormatter, CustomFormatters, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
name="Custom Formatter" />
</formatters>
<categorySources>
<add switchValue="All" name="General">
<listeners>
<add name="FlatFile TraceListener" />
</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="FlatFile TraceListener" />
</listeners>
</errors>
</specialSources>
</loggingConfiguration>
<startup>
<supportedRuntime version="v2.0.50727" />
</startup>
</configuration>

如果您不将 ErrorEntry 传递给 Logger.Write(),则将构造一个 LogEntry 而不是自定义 ErrorEntry .因此,您应该始终传递一个 ErrorEntry 而不是使用其他重载。例如:

ErrorEntry errorEntry = new ErrorEntry();
errorEntry.UserId = "ME!";
errorEntry.Message = "Default message";
errorEntry.Categories.Add("General");

Logger.Write(errorEntry);

关于c# - 使用自定义 logentry 类和自定义 logformatter,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13963263/

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