Log

DevForce always generates tracing messages as it runs, on both client and server.  By default in most environments these messages will be written to a log file.  You have control over whether a log file will be produced and where, write your own messages, and take control over the logging process.

In an n-tier application the client and server logs contain different messages, since different activities are performed by each.  Although the server log will record the activities (such as login and fetch) of the clients connected to it, its log is not a consolidation of all client logs.  

The Debug log

By default, DevForce will create a file of trace and debug messages in all environments except the Silverlight client and Azure*, as long as you specify the logFile in the logging element of the ideablade.configuration section:

To disable writing to the log file, set the logFile value to an empty string, or remove the logging element from the config.

If you don't have an ideablade.configuration section in your config file, or an error prevented it from loading, DevForce will initialize a default configuration.  That default will write a file named "DebugLog.xml" - to a log sub-folder for a web application, otherwise to the same folder as the executable.

To change the location of the log file, just include the full path and file name wanted.  For example, to write the log to a folder named "c:\AppLogs" with a name of "SalesAppLog.xml", set logFile="c:\AppLogs\SalesAppLog.xml".  If the folder does not exist, or lacks write permissions, the application will run but a file will not be created.  If the folder is a sub-folder of the application root folder, use a relative path name, such as "log\MyLog.xml".  Note that a tilde in a relative path name is not supported here.

The <logging> element in more detail

Since we've looked at the <logging> element above, let's look at a few other properties you can use to control logging.  

• Set archiveLogs="true" to archive log files.  By default this is off, but when on the previous log file will be renamed with a timestamp indicating the time the file was archived.

• Set shouldLogSqlQueries="true" to write the SQL for all entity queries to the log.  This can be particularly helpful in debugging.

We describe other settings in the discussion of real-time trace viewing.

Generate custom messages

The TraceFns and DebugFns classes (in IdeaBlade.Core) allow you to generate trace and debug messages from your code.  Both TraceFns and DebugFns provide identical behavior, except that TraceFns calls will always execute, since in Visual Studio .NET projects the conditional TRACE flag is enabled by default for both release and debug builds.  For example, you can use DebugFns.WriteLine to write diagnostic logging messages wanted only during testing of debug builds, while TraceFns.WriteLine can be used for the logging of messages you want in the deployed application.