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Tracing

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Implementing a Custom TraceListener. A mainstay of software engineering is a concept called tracing. The first time I encountered the trace capability was in the C programming language, implemented as a macro. The basic idea is that you insert statements into your code that provide information about your application while it is running. This is referred to as tracing. Historically tracing was something that occurred while debugging and testing. As you might imagine writing trace information to a console was especially useful before the integrated debugger. (The first integrated debugger I used was Borland's Turbo Pascal.) By using a trace mechanism you could run your program normally and view the trace information concurrently.

Often times the oldest and simplest techniques ripen because they are useful. There is substantial support for debugging and tracing built into .NET. Microsoft also realizes that you may likely want to send trace information somewhere besides the Output window. Implementing a Custom TraceListener. FileRollerTraceListener - Estoy Programando. Updated (Sept2007) The code of this sample can be found at codeplex: One year ago we needed to define how to instrument our system, our first User Story was.

Simple Interface to Log messages from code Configuration mechanism to indicate the destination sink Decoupling the write mechanism from the destination sink Decoupling from the component hoster (ASP.Net, Nunit, .EXE) Define Switches to define different trace levels (INFO, WARNING, ERROR) After some explorations (see ) we decided to extend a little bit the Trace utilities provided by System.Diagnostics. While developing the system we have been using the System.Diagnostics.TextWriterTraceListener to write log content to a file.

Now, we are in production, and we have seen some limitation with this tracelistener So today I have spent some time to fix this limitations. public TextWriterTraceListener(string fileName) : [Test] if (! Di.Create(); if (! Windows SDK: Download the Windows SDK for Windows 7 and More | MSDN. Using Service Trace Viewer for Viewing Correlated Traces and Troubleshooting. When the System.ServiceModel trace source is set with a switchValue other than Off, and ActivityTracing, WCF creates activities and transfers for WCF processing. An activity is a logical unit of processing that groups all traces related to that processing unit. For example, you can define one activity for each request. Transfers create a causal relationship between activities within endpoints.

Propagating the activity ID enables you to relate activities across endpoints. This can be done by setting propagateActivity=true in configuration at every endpoint. Activities, transfers, and propagation allow you to perform error correlation. On the client, one WCF activity is created for each object model call (for example, Open ChannelFactory, Add, Divide, and so on.) Constructed the channel factory (ClientBase). We see the security infrastructure messages because of the wsHttpBinding. Graph view of WCF client activities: Ambient Activity (here 0), Process action, and Set Up Secure Session.

Exploring Secrets of .NET Diagnostics. A Guide to Controlling Trace Output As a summary to the vital concepts you have been reading about, Table 8 collects reference links that you may need. Don't remember the difference between a TraceSwitch and a TraceSource? Check this table. Need to know how to define something in the configuration file? Check this table! Table 8: Key .NET Diagnostic Concepts: This table provides a brief description, plus links on the left to passages in the .NET Framework Developers Guide, and references on the right to the formal documentation. Interested in designing your own TraceListeners? Build a Trace Output Comparison Sandbox All the radio buttons and check boxes are populated dynamically.

Given the preliminaries you learned in the earlier parts of this article, the user interface of this tool should be reasonably evident. Source Levels—see Table 4Trace Options—see Table 6 (the shaded rows)Trace Listeners—see Table 5 (except for the TextBox). Table 9. Table 10: Shared vs. System.Diagnostics hidden SourceLevels. Exploring Secrets of .NET Diagnostics. From zero to logging with System.Diagnostics in 15 minutes. Essential Diagnostics. Tracing in .NET and Implementing Your Own Trace Listeners. By Mansoor Ahmed Siddiqui Two important programming operations/processes that help us create and maintain applications are called "Debugging" and "Tracing". Debugging allows us to observe and correct programming errors. Tracing is a form of Debugging that allows us to keep track of the health and sanitary conditions of our applications (It is a rather rigid and very specific definition). It is very important to be able to dynamically control the behavior of our application and to keep track of some of the aspects of the application (i.e. how our application is performing, what errors are produced at runtime, how application performs at peak time, how to dynamically alter the behavior of our application, etc).

We will discuss in detail how Debugging and Tracing has been implemented in .NET and how to customize them according to our needs. Download source code below. Tracing in .NET So how has tracing been implemented in .NET? Figure 1 Trace.WriteLine ("Hello 15Seconds Reader - Trace! ") Figure 2. Ukadc.Diagnostics. This lightweight reference example should help users quickly get to grips with the new Ukadc.Diagnostics library. A number (though not all) of the features are demonstrated and can be downloaded and built in Visual Studio 2008. The source is available at the end of this page. The Scenario This quickstart considers a very simple scenario with a website and a WCF service (hosted in IIS/Cassini).

The default.aspx page shows a list of products which are retrieved from the WCF service. Not going to win any awards for design but this example is about logging. Instrumenting the Web Site using System.Diagnostics The first thing we do is add some logging code to the application. Private static TraceSource _source = new TraceSource("ReferenceWebApplication"); protected void Application_Error(object sender, EventArgs e) { _source.TraceData(TraceEventType.Error, 0, this.Server.GetLastError()); } Note - At this point we aren't making any decisions about what happens to this logging information. Bare Metal Software > Tools for Computer Professionals. NLog – Advanced .NET Logging. Performance Analysis of Logs (PAL) Tool - Download: PAL v1.1.8. Introduction à log4net. Comme un exemple vaut mieux qu'un long discours, dans ce chapitre, nous allons voir un exemple d'utilisation de log4net au sein d'un projet web.

Nous verrons comment associer différents appenders à un même logger, comment configurer les informations à logger, comment jouer avec les niveaux de logs . Les sources du projet sont téléchargeables via le lien se trouvant à la fin de ce document. Attaquons dans le vif du sujet avec le fichier de configuration de log4net. Comme vu précédemment, ce fichier permet principalement de définir quelles informations seront loggées, de quelle manière, vers quel support. Voilà le fichier de configuration dans son intégralité : Détaillons plus précisément le contenu de ce fichier en commençant par les appenders.

On peut voir 5 appenders différents, c'est-à-dire qu'on pourra logger vers 5 destinations différentes : SmtpAppender Ici, on a créé un appender de type SmtpAppender dont le but est d'envoyer un mail. DatabaseAppender Cet appender sert à logger en base. Log4net: Home. Log4net Tutorial. Download source code - 218 KB Introduction One of the greatest logging tools out there for .NET is log4net. This software is the gold standard for how logging should be done. It is simple, powerful, and extensible. Video Tutorial As a supplement to this article, I have created a video tutorial on YouTube that will go over the material in this article. The Basics There are a three parts to log4net. Logging Levels There are seven logging levels, five of which can be called in your code.

OFF - nothing gets logged (cannot be called) FATAL ERROR WARN INFO DEBUG ALL - everything gets logged (cannot be called) These levels will be used multiple times, both in your code as well as in the config file. The Configuration The standard way to set up a log4net logger is to utilize either the app.config file in a desktop application or the web.config file in a web application. Root You need to have one root section to house your top-level logger references. Hide Copy Code Additional Loggers ConfigSections FAQs. Beginning System.Diagnostics. Following are the important classes in Diagnostics namespace. System.Diagnostics.EventLog This component provides functionality to write to event logs, read event log entries, and create and delete event logs and event sources on the network.

Some related classes: EventLog: Provides interaction with Windows event logs EventLogEntry: Encapsulates a single record in the event log. This class cannot be inherited. EventLogEntryCollection: Defines size and enumerators for a collection of EventLogEntry instances EventLogInstaller: Allows you to install and configure an event log that your application reads from or writes to when running. Examples: How to write to event log: Create an object of EventLog class as follows: Dim ev As New EventLog("Application", _ System.Environment.MachineName, "MyAppName") Call the WriteEntry method of the above class. ev.WriteEntry(“My event text”, _ System.Diagnostics.EventLogEntryType.Information, myeventid) Close the writer. Ev.close How to read from event log: Example: