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Used to output the logger of the logging event. The logger conversion specifier can be optionally followed by precision specifier, that is a decimal constant in brackets.

If a precision specifier is given, then only the corresponding number of right most components of the logger name will be printed. By default the logger name is printed in full.

For example, for the logger name “a.b.c” the pattern %c{2} will output “b.c”.

Used to output the fully qualified class name of the caller issuing the logging request. This conversion specifier can be optionally followed by precision specifier, that is a decimal constant in brackets.

If a precision specifier is given, then only the corresponding number of right most components of the class name will be printed. By default the class name is output in fully qualified form.

For example, for the class name “log4net.Layout.PatternLayout”, the pattern %C{1} will output “PatternLayout”.

WARNING Generating the caller class information is slow. Thus, it’s use should be avoided unless execution speed is not an issue.

Used to output the date of the logging event. The date conversion specifier may be followed by a date format specifier enclosed between braces. For example, %d{HH:mm:ss,fff} or %d{dd MMM yyyy HH:mm:ss,fff}. If no date format specifier is given then ISO8601 format is assumed (ISO8601DateFormatter).

The date format specifier admits the same syntax as the time pattern string of the ToString.

For better results it is recommended to use the log4net date formatters. These can be specified using one of the strings “ABSOLUTE”, “DATE” and “ISO8601” for specifying AbsoluteTimeDateFormatter, and respectively ISO8601DateFormatter. For example, %d{ISO8601} or %d{ABSOLUTE}.

These dedicated date formatters perform significantly better than ToString.

Used to output the file name where the logging request was issued.

WARNING Generating caller location information is extremely slow. It’s use should be avoided unless execution speed is not an issue.

Used to output location information of the caller which generated the logging event.

The location information depends on the CLI implementation but usually consists of the fully qualified name of the calling method followed by the callers source the file name and line number between parentheses.

The location information can be very useful. However, it’s generation is extremely slow. It’s use should be avoided unless execution speed is not an issue.

Used to output the line number from where the logging request was issued.

WARNING Generating caller location information is extremely slow. It’s use should be avoided unless execution speed is not an issue.

Used to output the application supplied message associated with the logging event.

Used to output the method name where the logging request was issued.

WARNING Generating caller location information is extremely slow. It’s use should be avoided unless execution speed is not an issue.

Outputs the platform dependent line separator character or characters.

This conversion character offers practically the same performance as using non-portable line separator strings such as “\n”, or “\r\n”. Thus, it is the preferred way of specifying a line separator.

Used to output the level of the logging event.

Used to output the an event specific property. The key to lookup must be specified within braces and directly following the pattern specifier, e.g. %X{user} would include the value from the property that is keyed by the string ‘user’. Each property value that is to be included in the log must be specified separately. Properties are added to events by loggers or appenders. By default no properties are defined.

Used to output the number of milliseconds elapsed since the start of the application until the creation of the logging event.

Used to output the name of the thread that generated the logging event. Uses the thread number if no name is available.

Used to output the user name for the currently active user (Principal.Identity.Name).

WARNING Generating caller information is extremely slow. It’s use should be avoided unless execution speed is not an issue.

Used to output the WindowsIdentity for the currently active user.

WARNING Generating caller WindowsIdentity information is extremely slow. It’s use should be avoided unless execution speed is not an issue.

Used to output the NDC (nested diagnostic context) associated with the thread that generated the logging event.

Used to output the MDC (mapped diagnostic context) associated with the thread that generated the logging event. The key to lookup must be specified within braces and directly following the pattern specifier, e.g. %X{user} would include the value from the MDC that is keyed by the string ‘user’. Each MDC value that is to be included in the log must be specified separately.

The sequence %% outputs a single percent sign.