log4net SDK Reference |

# IOptionHandler Interface

Interface used to delay activate a configured object.

For a list of all members of this type, see IOptionHandler Members.

log4net.Core.IOptionHandler
log4net.Filter.IFilter

[Visual Basic]
Public Interface IOptionHandler
[C#]
public interface IOptionHandler

#### Types that implement IOptionHandler

Type | Description
--- | ---
AdoNetAppender | Appender that logs to a database.
AnsiColorTerminalAppender | Appends logging events to the terminal using ANSI color escape sequences.
AnsiColorTerminalAppender.LevelColors | A class to act as a mapping between the level that a logging call is made at and the color it should be displayed as.
AppenderSkeleton | Abstract base class implementation of IAppender.
AspNetTraceAppender | Appends log events to the ASP.NET TraceContext system.
BufferingAppenderSkeleton | Abstract base class implementation of IAppender that buffers events in a fixed size buffer.
BufferingForwardingAppender | Buffers events and then forwards them to attached appenders.
ColoredConsoleAppender | Appends logging events to the console.
ColoredConsoleAppender.LevelColors | A class to act as a mapping between the level that a logging call is made at and the color it should be displayed as.
ConsoleAppender | Appends logging events to the console.
DebugAppender | Appends log events to the Debug system.
EventLogAppender | Writes events to the system event log.
EventLogAppender.Level2EventLogEntryType | A class to act as a mapping between the level that a logging call is made at and the color it should be displayed as.
FileAppender | Appends logging events to a file.
ForwardingAppender | This appender forwards logging events to attached appenders.
LocalSyslogAppender | Logs events to a local syslog service.
LocalSyslogAppender.LevelSeverity | A class to act as a mapping between the level that a logging call is made at and the syslog severity that is should be logged at.
MemoryAppender | Stores logging events in an array.
NetSendAppender | Logs entries by sending network messages using the NetMessageBufferSend native function.
OutputDebugStringAppender | Appends log events to the OutputDebugString system.
RemoteSyslogAppender | Logs events to a remote syslog daemon.
RemoteSyslogAppender.LevelSeverity | A class to act as a mapping between the level that a logging call is made at and the syslog severity that is should be logged at.
RemotingAppender | Delivers logging events to a remote logging sink.
RollingFileAppender | Appender that rolls log files based on size or date or both.
SmtpAppender | Send an e-mail when a specific logging event occurs, typically on errors or fatal errors.
SmtpPickupDirAppender | Send an email when a specific logging event occurs, typically on errors or fatal errors. Rather than sending via smtp it writes a file into the directory specified by PickupDir. This allows services such as the IIS SMTP agent to manage sending the messages.
TelnetAppender | Appender that allows clients to connect via Telnet to receive log messages
TextWriterAppender | Sends logging events to a TextWriter.
TraceAppender | Appends log events to the Trace system.
UdpAppender | Sends logging events as connectionless UDP datagrams to a remote host or a multicast group using an UdpClient.
DenyAllFilter | This filter drops all LoggingEvent.
FilterSkeleton | Subclass this type to implement customized logging event filtering
LevelMatchFilter | This is a very simple filter based on Level matching.
LevelRangeFilter | This is a simple filter based on Level matching.
LoggerMatchFilter | Simple filter to match a string in the event's logger name.
MdcFilter | Simple filter to match a keyed string in the MDC
NdcFilter | Simple filter to match a string in the NDC
PropertyFilter | Simple filter to match a string an event property
StringMatchFilter | Simple filter to match a string in the rendered message
ExceptionLayout | A Layout that renders only the Exception text from the logging event
LayoutSkeleton | Extend this abstract class to create your own log layout format.
PatternLayout | A flexible layout configurable with pattern string.
SimpleLayout | A very simple layout
XmlLayout | Layout that formats the log events as XML elements.
XmlLayoutBase | Layout that formats the log events as XML elements.
XmlLayoutSchemaLog4j | Layout that formats the log events as XML elements compatible with the log4j schema
LevelMapping | Manages a mapping from levels to LevelMappingEntry
LevelMappingEntry | An entry in the LevelMapping
PatternString | This class implements a patterned string.
WindowsSecurityContext | Impersonate a Windows Account

#### Remarks

This allows an object to defer activation of its options until all options have been set. This is required for components which have related options that remain ambiguous until all are set.

If a component implements this interface then the ActivateOptions method must be called by the container after its all the configured properties have been set and before the component can be used.

#### Requirements

Namespace: log4net.Core

Assembly: log4net (in log4net.dll)

#### See Also

IOptionHandler Members | log4net.Core Namespace