ConnectorLib .NET 25.2
ConnectorLib .NET SDK Programming Guide

# Write Messages to the Log

All of the fetch action methods you can override in `ConnectorBase` are passed a `task` object with a `Log` property of type `ILog`. This allows you to log messages at a variety of levels:

           task.Log.WriteLine(LogLevel.Always,
    		"This message will always be logged");
           task.Log.WriteLine(LogLevel.Critical,
    		"This is logged at the critical level");
           task.Log.WriteLine(LogLevel.Error,
    		"Errors are logged at this level");
           task.Log.WriteLine(LogLevel.Warning,
    		"Warnings are logged at this level");
           task.Log.WriteLine(LogLevel.Normal,
    		"This is the normal level of verbosity for logs");
           task.Log.WriteLine(LogLevel.Full,
    		"Verbose logging");
           task.Log.WriteLine(LogLevel.Debug,
    		"For internal use only - these messages will never appear");

These levels correspond to the levels you can specify for the `LogLevel` parameter in the `[Logging]` section of the connector's configuration file. Messages only appear in the connector's log files if the `LogLevel` parameter is set to the level passed to `WriteLine`, or a more verbose level. For more information about the `LogLevel` parameter, see LogLevel.

## Log Files

The connector writes each log message to one of its log streams. When an administrator deploys a connector, they can choose to write messages from each log stream to a separate file. For example, the administrator might choose to write messages from the synchronize log stream to `synchronize.log`, messages from the collect log stream to `collect.log`, and so on.

The log stream that the connector uses for a specific log message depends on the type of task that logged the message:

Method Overridden | Task Type | Log Stream
--- | --- | ---
Synchronize | ISynchronizeTask | Synchronize
SynchronizeIds | ISynchronizeIdsTask | Synchronize
SynchronizeGroups | ISynchronizeGroupsTask | SynchronizeGroups
Collect | ICollectTask | Collect
Remove | IDeleteTask | Delete
Insert | IInsertTask | Insert
Update | IUpdateTask | Update
View | IViewTask | View
Hold | IHoldTask | Hold

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Version 25.2 | Last updated April 2025

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Product: Knowledge Discovery ConnectorLib .NET 25.2

Topic Title: Write Messages to the Log