问题
Is it possible to dynamically set log folder and file name in C# which overrides the config value(file name) in the Listeners section of logging configuration? Tried to follow the below link but it is applicable only for EL 5 Log messages going to previously created log file
This is how i Initialize EL Logging:
IConfigurationSource configurationSource = ConfigurationSourceFactory.Create();
LogWriterFactory logWriterFactory = new LogWriterFactory(configurationSource);
Logger.SetLogWriter(logWriterFactory.Create(), false);
ExceptionPolicyFactory factory = new ExceptionPolicyFactory(configurationSource);
ExceptionPolicy.SetExceptionManager(factory.CreateManager());
These are my web.config entries inside the listeners tag:
<add name="RollingFlatFileTraceLog" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
fileName="C:\logs\Trace.log" footer=""
formatter="CustomRollingFlatFileLogFormatter"
header="" rollFileExistsBehavior="Overwrite" rollInterval="Day"
rollSizeKB="2048" maxArchivedFiles="52" />
<add name="RollingFlatFileErrorLog" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
fileName="C:\logs\Error.log" footer="----------------------------------------"
formatter=" CustomRollingFlatFileLogFormatter "
header="----------------------------------------" rollFileExistsBehavior="Overwrite"
rollInterval="Day" rollSizeKB="2048" maxArchivedFiles="52" />
I use Logger.Write and ExceptionPolicy.HandleException to write to the corresponding trace and error logs.
回答1:
The best (and easiest!) approach would be to use programmatic configuration to set the filename.
However, you can use a similar approach to modify settings at runtime. Setup the configuration in an external file and use a file configuration source in app/web.config. An external file is necessary to avoid a configuration is read-only exception.
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="enterpriseLibrary.ConfigurationSource" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ConfigurationSourceSection, Microsoft.Practices.EnterpriseLibrary.Common, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" />
</configSections>
<enterpriseLibrary.ConfigurationSource selectedSource="File-based Configuration Source">
<sources>
<add name="File-based Configuration Source" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.FileConfigurationSource, Microsoft.Practices.EnterpriseLibrary.Common, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
filePath="entlib.config" />
</sources>
</enterpriseLibrary.ConfigurationSource>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6"/>
</startup>
</configuration>
And configure the external file (entlib.config in this case):
<configuration>
<configSections>
<section name="exceptionHandling" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Configuration.ExceptionHandlingSettings, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" />
<section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings, Microsoft.Practices.EnterpriseLibrary.Logging, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" />
</configSections>
<exceptionHandling>
<exceptionPolicies>
<add name="Policy">
<exceptionTypes>
<add name="All Exceptions" type="System.Exception, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
postHandlingAction="NotifyRethrow">
<exceptionHandlers>
<add name="Logging Exception Handler" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Logging.LoggingExceptionHandler, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Logging, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
logCategory="General" 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>
<loggingConfiguration name="" tracingEnabled="true" defaultCategory="General">
<listeners>
<add name="Event Log Listener" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.FormattedEventLogTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FormattedEventLogTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
source="Enterprise Library Logging" formatter="Text Formatter"
log="" machineName="." traceOutputOptions="None" />
<add name="Flat File Trace Listener" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.FlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
fileName="trace.log" />
</listeners>
<formatters>
<add type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
template="Timestamp: {timestamp}{newline}
Message: {message}{newline}
Category: {category}{newline}
Priority: {priority}{newline}
EventId: {eventid}{newline}
Severity: {severity}{newline}
Title:{title}{newline}
Machine: {localMachine}{newline}
App Domain: {localAppDomain}{newline}
ProcessId: {localProcessId}{newline}
Process Name: {localProcessName}{newline}
Thread Name: {threadName}{newline}
Win32 ThreadId:{win32ThreadId}{newline}
Extended Properties: {dictionary({key} - {value}{newline})}"
name="Text Formatter" />
</formatters>
<categorySources>
<add switchValue="All" name="General">
<listeners>
<add name="Flat File Trace Listener" />
</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="Event Log Listener" />
</listeners>
</errors>
</specialSources>
</loggingConfiguration>
</configuration>
Use the SerializableConfigurationSource from the blog posting:
public class SerializableConfigurationSource : IConfigurationSource
{
Dictionary<string, ConfigurationSection> sections = new Dictionary<string, ConfigurationSection>();
public SerializableConfigurationSource()
{
}
public ConfigurationSection GetSection(string sectionName)
{
ConfigurationSection configSection;
if (sections.TryGetValue(sectionName, out configSection))
{
SerializableConfigurationSection section = configSection as SerializableConfigurationSection;
if (section != null)
{
using (StringWriter xml = new StringWriter())
using (XmlWriter xmlwriter = System.Xml.XmlWriter.Create(xml))
{
section.WriteXml(xmlwriter);
xmlwriter.Flush();
MethodInfo methodInfo = section.GetType().GetMethod("DeserializeSection", BindingFlags.NonPublic | BindingFlags.Instance);
methodInfo.Invoke(section, new object[] { XDocument.Parse(xml.ToString()).CreateReader() });
return configSection;
}
}
}
return null;
}
public void Add(string sectionName, ConfigurationSection configurationSection)
{
sections[sectionName] = configurationSection;
}
public void AddSectionChangeHandler(string sectionName, ConfigurationChangedEventHandler handler)
{
throw new NotImplementedException();
}
public void Remove(string sectionName)
{
sections.Remove(sectionName);
}
public void RemoveSectionChangeHandler(string sectionName, ConfigurationChangedEventHandler handler)
{
throw new NotImplementedException();
}
public event EventHandler<ConfigurationSourceChangedEventArgs> SourceChanged;
public void Dispose()
{
}
}
Bootstrap the blocks at startup:
IConfigurationSource configSource = ConfigurationSourceFactory.Create();
var loggingSettings = configSource.GetSection(LoggingSettings.SectionName) as LoggingSettings;
var data = loggingSettings.TraceListeners.First(t => t.Name == "Flat File Trace Listener") as FlatFileTraceListenerData;
// Change the file name
data.FileName = "trace_1.txt";
var loggingXmlConfigSource = new SerializableConfigurationSource();
loggingXmlConfigSource.Add(LoggingSettings.SectionName, loggingSettings);
var logFactory = new LogWriterFactory(loggingXmlConfigSource);
Logger.SetLogWriter(logFactory.Create());
IConfigurationSource config = ConfigurationSourceFactory.Create();
ExceptionPolicyFactory factory = new ExceptionPolicyFactory(config);
ExceptionManager exManager = factory.CreateManager();
ExceptionPolicy.SetExceptionManager(exManager);
// This will log to the file trace_1.txt
ExceptionPolicy.HandleException(new Exception(), "Policy");
回答2:
As you have mentioned in the post, Setup the configuration in an external file. External file means, can you confirm in which path we have to place the Entlib.config file.
来源：https://stackoverflow.com/questions/30786387/enterprise-library-6-dynamically-change-log-file-name