PatternString Class

Used to output the friendly name of the current AppDomain.

Used to output the date of the logging event in the local time zone. To output the date in universal time use the %utcdate pattern. The date conversion specifier may be followed by a date format specifier enclosed between braces. For example, %date{HH:mm:ss,fff} or %date{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, DateTimeDateFormatter and respectively Iso8601DateFormatter. For example, %date{ISO8601} or %date{ABSOLUTE}.

These dedicated date formatters perform significantly better than ToString.

Used to output the a specific environment variable. The key to lookup must be specified within braces and directly following the pattern specifier, e.g. %env{COMPUTERNAME} would include the value of the COMPUTERNAME environment variable.

The env pattern is not supported on the .NET Compact Framework.

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

Outputs the platform dependent line separator character or characters.

This conversion pattern name offers 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 system process ID for the current process.

Used to output a specific context property. The key to lookup must be specified within braces and directly following the pattern specifier, e.g. %property{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 stored in logging contexts. By default the log4net:HostName property is set to the name of machine on which the event was originally logged.

If no key is specified, e.g. %property then all the keys and their values are printed in a comma separated list.

The properties of an event are combined from a number of different contexts. These are listed below in the order in which they are searched.

the thread properties

The Properties that are set on the current thread. These properties are shared by all events logged on this thread.

the global properties

The Properties that are set globally. These properties are shared by all the threads in the AppDomain.

Used to output a random string of characters. The string is made up of uppercase letters and numbers. By default the string is 4 characters long. The length of the string can be specified within braces directly following the pattern specifier, e.g. %random{8} would output an 8 character string.

Used to output the WindowsIdentity for the currently active user.

Used to output the date of the logging event in universal time. The date conversion specifier may be followed by a date format specifier enclosed between braces. For example, %utcdate{HH:mm:ss,fff} or %utcdate{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, DateTimeDateFormatter and respectively Iso8601DateFormatter. For example, %utcdate{ISO8601} or %utcdate{ABSOLUTE}.

These dedicated date formatters perform significantly better than ToString.

The sequence %% outputs a single percent sign.