自定义tracellistener和多个消息
本文关键字：消息 tracellistener 自定义 | 更新日期: 2023-09-27 18:04:33
我在使用自定义tracellistener时遇到了一些困难。问题是，写入单个跟踪行会产生两个调用，一个调用Write()，另一个调用WriteLine()。Write()的调用包含跟踪源、级别和事件id。对WriteLine()的调用是实际的消息
看起来跟踪侦听器只实例化了一次，所以我不能将第一次调用写入()排队。看起来这两次通话没有任何关联。不幸的是，这是一个问题，因为它导致我向远程服务发送2条消息，使开销加倍。
似乎也没有任何通用的方法来过滤调用。我接受忽略带有源和级别的调用，但这似乎很容易发生。
下面是一段示例代码:
/// <summary>
/// When overridden in a derived class, writes the specified message to the listener you create in the derived class.
/// </summary>
/// <param name="message">A message to write. </param><filterpriority>2</filterpriority>
public override void Write(string message)
{
_client.Post(message);
}
/// <summary>
/// When overridden in a derived class, writes a message to the listener you create in the derived class, followed by a line terminator.
/// </summary>
/// <param name="message">A message to write. </param><filterpriority>2</filterpriority>
public override void WriteLine(string message)
{
_client.Post(message);
}
用法:
private static readonly TraceSource Ts = new TraceSource("Source");
Ts.TraceEvent(TraceEventType.Error, 0, "Error Message");
将产生一个Write()调用:
然后用 调用WriteLine()"Source: Error: 0"
"错误信息"
是否有可能将这两个消息结合起来?还是只过滤第一个?谢谢!
有2个消息，2种不同的格式…这些信是写给哪里的?这是使用企业日志块吗?如果是，您应该检查配置文件-侦听器可能被注册两次。
我能够通过实现来自Ukadc Diagnostics的TraceListener基类来解决这个问题
基类是:
public abstract class CustomTraceListener : TraceListener
{
private static readonly TraceSource Trace = new TraceSource("PostmarkTraceListener");
/// <summary>
/// Construct an instance of the trace listener
/// </summary>
/// <param name="name">The name of the trace listener</param>
protected CustomTraceListener(string name)
: base(name)
{
}
#region Abstracts
/// <summary>
/// This method must be overriden and forms the core logging method called by all other TraceEvent methods.
/// </summary>
/// <param name="eventCache">A cache of data that defines the trace event</param>
/// <param name="source">The trace source</param>
/// <param name="eventType">The type of event</param>
/// <param name="id">The unique ID of the trace event</param>
/// <param name="message">A message to be output regarding the trace event</param>
protected abstract void TraceEventCore(TraceEventCache eventCache, string source, TraceEventType eventType,
int id, string message);
/// <summary>
/// This method must be overriden and forms the core logging method called by all otherTraceData methods.
/// </summary>
/// <param name="eventCache">A cache of data that defines the trace event</param>
/// <param name="source">The trace source</param>
/// <param name="eventType">The type of event</param>
/// <param name="id">The unique ID of the trace event</param>
/// <param name="data">The data to be logged</param>
protected abstract void TraceDataCore(TraceEventCache eventCache, string source, TraceEventType eventType,
int id, params object[] data);
#endregion
#region TraceData/TraceEvent Overrides
/// <summary>
/// Write a trace event
/// </summary>
/// <param name="eventCache">A cache of data that defines the trace event</param>
/// <param name="source">The trace source</param>
/// <param name="eventType">The type of event</param>
/// <param name="id">The unique ID of the trace event</param>
/// <param name="message">A message to be output regarding the trace event</param>
public override sealed void TraceEvent(TraceEventCache eventCache, string source, TraceEventType eventType,
int id, string message)
{
FilterTraceEventCore(eventCache, source, eventType, id, message);
}
/// <summary>
/// Write a trace event
/// </summary>
/// <param name="eventCache">A cache of data that defines the trace event</param>
/// <param name="source">The trace source</param>
/// <param name="eventType">The type of event</param>
/// <param name="id">The unique ID of the trace event</param>
/// <param name="format">A string format specification for the trace event</param>
/// <param name="args">Arguments used within the format specification string</param>
public override sealed void TraceEvent(TraceEventCache eventCache, string source, TraceEventType eventType,
int id, string format, params object[] args)
{
string message = string.Format(CultureInfo.CurrentCulture, format, args);
FilterTraceEventCore(eventCache, source, eventType, id, message);
}
/// <summary>
/// Write a trace event
/// </summary>
/// <param name="eventCache">A cache of data that defines the trace event</param>
/// <param name="source">The trace source</param>
/// <param name="eventType">The type of event</param>
/// <param name="id">The unique ID of the trace event</param>
public override sealed void TraceEvent(TraceEventCache eventCache, string source, TraceEventType eventType,
int id)
{
FilterTraceEventCore(eventCache, source, eventType, id, null);
}
/// <summary>
/// Write a trace event
/// </summary>
/// <param name="eventCache">A cache of data that defines the trace event</param>
/// <param name="source">The trace source</param>
/// <param name="eventType">The type of event</param>
/// <param name="id">The unique ID of the trace event</param>
/// <param name="data">The data to be written</param>
public override sealed void TraceData(TraceEventCache eventCache, string source, TraceEventType eventType,
int id, object data)
{
FilterTraceDataCore(eventCache, source, eventType, id, data);
}
/// <summary>
/// Write a trace event
/// </summary>
/// <param name="eventCache">A cache of data that defines the trace event</param>
/// <param name="source">The trace source</param>
/// <param name="eventType">The type of event</param>
/// <param name="id">The unique ID of the trace event</param>
/// <param name="data">The data to be written</param>
public override sealed void TraceData(TraceEventCache eventCache, string source, TraceEventType eventType,
int id, params object[] data)
{
FilterTraceDataCore(eventCache, source, eventType, id, data);
}
#endregion
#region Write Methods
/// <summary>
/// Write a message to the trace listeners
/// </summary>
/// <param name="message">The message to write</param>
public override void Write(string message)
{
FilterTraceEventCore(null, string.Empty, TraceEventType.Information, 0, message);
}
/// <summary>
/// Write a message to the trace listeners
/// </summary>
/// <param name="message">The message to write</param>
public override void WriteLine(string message)
{
Write(message);
}
#endregion
#region ShouldTrace
/// <summary>
/// Determines whether a filter is attached to this listener and, if so, asks whether it ShouldTrace applies to this data.
/// </summary>
protected virtual bool ShouldTrace(TraceEventCache eventCache, string source, TraceEventType eventType, int id,
string formatOrMessage, object[] args, object data1, object[] data)
{
return !(Filter != null && !Filter.ShouldTrace(eventCache, source, eventType, id, formatOrMessage, args, data1, data));
}
#endregion
#region FilterTraceCore
/// <summary>
/// Called before the main TraceEventCore method and applies any filter by calling ShouldTrace.
/// </summary>
protected virtual void FilterTraceEventCore(TraceEventCache eventCache, string source, TraceEventType eventType,
int id, string message)
{
try
{
if (!ShouldTrace(eventCache, source, eventType, id, message, null, null, null))
return;
TraceEventCore(eventCache, source, eventType, id, message);
}
catch (Exception exc)
{
Trace.TraceEvent(TraceEventType.Error, 0, "{0}", exc);
}
}
/// <summary>
/// Called before the main TraceDataCore method and applies any filter by calling ShouldTrace.
/// </summary>
protected virtual void FilterTraceDataCore(TraceEventCache eventCache, string source, TraceEventType eventType,
int id, params object[] data)
{
try
{
if (!ShouldTrace(eventCache, source, eventType, id, null, null, null, data))
return;
TraceDataCore(eventCache, source, eventType, id, data);
}
catch (Exception exc)
{
Trace.TraceEvent(TraceEventType.Error, 0, "{0}", exc);
}
}
#endregion
}
和我的自定义tracellistener:
public class PostmarkTraceListener : CustomTraceListener
{
#region CustomTraceListener Overrides
/// <summary>
/// This method must be overriden and forms the core logging method called by all other TraceEvent methods.
/// </summary>
/// <param name="eventCache">A cache of data that defines the trace event</param>
/// <param name="source">The trace source</param>
/// <param name="eventType">The type of event</param>
/// <param name="id">The unique ID of the trace event</param>
/// <param name="message">A message to be output regarding the trace event</param>
protected override void TraceEventCore(TraceEventCache eventCache, string source, TraceEventType eventType,
int id, string message)
{
SendPostmarkMessage(eventCache, source, eventType, id, message, null);
}
/// <summary>
/// This method must be overriden and forms the core logging method called by all otherTraceData methods.
/// </summary>
/// <param name="eventCache">A cache of data that defines the trace event</param>
/// <param name="source">The trace source</param>
/// <param name="eventType">The type of event</param>
/// <param name="id">The unique ID of the trace event</param>
/// <param name="data">The data to be logged</param>
protected override void TraceDataCore(TraceEventCache eventCache, string source, TraceEventType eventType,
int id, params object[] data)
{
SendPostmarkMessage(eventCache, source, eventType, id, null, data);
}
#endregion
private void SendPostmarkMessage(TraceEventCache eventCache, string source, TraceEventType eventType, int id, params object[] data)
{
// do your work here
}
}
你可以找到一个工作的例子在我的github帐户