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Showing content from https://github.com/nlog/nlog/wiki/Fluent-Logger-API below:

Fluent Logger API · NLog/NLog Wiki · GitHub

NLog 5.0 introduces new fluent LogEventBuilder that can be activated with one of these extensions methods for ILogger:

• ForLogEvent - Builds base LogEvent
• ForTraceEvent - Builds LogEvent with Trace-LogLevel
• ForDebugEvent - Builds LogEvent with Debug-LogLevel
• ForInfoEvent - Builds LogEvent with Info-LogLevel
• ForWarnEvent - Builds LogEvent with Warn-LogLevel
• ForErrorEvent - Builds LogEvent with Error-LogLevel
• ForFatalEvent - Builds LogEvent with Fatal-LogLevel
• ForExceptionEvent - Builds LogEvent with Exception and Error-LogLevel

To complete the fluent builder then call Log() to capture available callsite information with help from Caller Member Attributes, and then writes the actual LogEvent to any configured NLog targets.

Replaces the old Fluent-namespace and also reduces memory-allocation when LogLevel not enabled.

_logger.ForInfoEvent()
       .Message("This is a fluent message {0}.", "test")
       .Property("PropertyName", "PropertyValue")
       .Log();

try
{
    string text = File.ReadAllText(path);
}
catch (Exception ex)
{
    _logger.ForExceptionEvent(ex)
           .Message("Error reading file '{0}'.", path)
           .Property("Test", "InfoWrite")
           .Log();
}

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