| <html><head><meta http-equiv="X-UA-Compatible" content="IE=edge" /><link rel="shortcut icon" href="../icons/favicon.ico" /><style type="text/css">.OH_CodeSnippetContainerTabLeftActive, .OH_CodeSnippetContainerTabLeft,.OH_CodeSnippetContainerTabLeftDisabled { }.OH_CodeSnippetContainerTabRightActive, .OH_CodeSnippetContainerTabRight,.OH_CodeSnippetContainerTabRightDisabled { }.OH_footer { }</style><link rel="stylesheet" type="text/css" href="../styles/branding.css" /><link rel="stylesheet" type="text/css" href="../styles/branding-en-US.css" /><script type="text/javascript" src="../scripts/branding.js"> </script><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>IFilter Interface</title><meta name="Language" content="en-us" /><meta name="System.Keywords" content="IFilter interface" /><meta name="System.Keywords" content="log4net.Filter.IFilter interface" /><meta name="System.Keywords" content="IFilter interface, about IFilter interface" /><meta name="Microsoft.Help.F1" content="log4net.Filter.IFilter" /><meta name="Microsoft.Help.Id" content="T:log4net.Filter.IFilter" /><meta name="Description" content="Implement this interface to provide customized logging event filtering" /><meta name="Microsoft.Help.ContentType" content="Reference" /><meta name="BrandingAware" content="true" /><meta name="container" content="log4net.Filter" /><meta name="file" content="T_log4net_Filter_IFilter" /><meta name="guid" content="T_log4net_Filter_IFilter" /></head><body onload="OnLoad('cs')"><input type="hidden" id="userDataCache" class="userDataStyle" /><div class="OH_outerDiv"><div class="OH_outerContent"><table class="TitleTable"><tr><td class="OH_tdTitleColumn">IFilter Interface</td><td class="OH_tdRunningTitleColumn">Apache log4net™ SDK Documentation</td></tr></table><div id="mainSection"><div id="mainBody"><span class="introStyle"></span><div class="summary"> | |
| Implement this interface to provide customized logging event filtering | |
| </div><p> </p><strong>Namespace:</strong> <a href="N_log4net_Filter.htm">log4net.Filter</a><br /><strong>Assembly:</strong> log4net (in log4net.dll) Version: 2.0.8.0-.NET 4.0<div class="OH_CollapsibleAreaRegion"><div class="OH_regiontitle">Syntax</div><div class="OH_CollapsibleArea_HrDiv"><hr class="OH_CollapsibleArea_Hr" /></div></div><div class="OH_clear"> </div><div class="OH_CodeSnippetContainer"><div class="OH_CodeSnippetContainerTabs"><div class="OH_CodeSnippetContainerTabLeft" id="ID0EDCA_tabimgleft"> </div><div id="ID0EDCA_tab1" class="OH_CodeSnippetContainerTabFirst"><a href="#" onclick="javascript:ChangeTab('ID0EDCA','cs','1','4');return false;">C#</a></div><div id="ID0EDCA_tab2" class="OH_CodeSnippetContainerTab"><a href="#" onclick="javascript:ChangeTab('ID0EDCA','vb','2','4');return false;">VB</a></div><div id="ID0EDCA_tab3" class="OH_CodeSnippetContainerTab"><a href="#" onclick="javascript:ChangeTab('ID0EDCA','cpp','3','4');return false;">C++</a></div><div id="ID0EDCA_tab4" class="OH_CodeSnippetContainerTab"><a href="#" onclick="javascript:ChangeTab('ID0EDCA','fs','4','4');return false;">F#</a></div><div class="OH_CodeSnippetContainerTabRight" id="ID0EDCA_tabimgright"> </div></div><div class="OH_CodeSnippetContainerCodeCollection"><div class="OH_CodeSnippetToolBar"><div class="OH_CodeSnippetToolBarText"><a id="ID0EDCA_copyCode" href="#" onclick="javascript:CopyToClipboard('ID0EDCA');return false;" title="Copy">Copy</a></div></div><div id="ID0EDCA_code_Div1" class="OH_CodeSnippetContainerCode" style="display: block"><pre xml:space="preserve"><span class="keyword">public</span> <span class="keyword">interface</span> <span class="identifier">IFilter</span> : <span class="identifier">IOptionHandler</span></pre></div><div id="ID0EDCA_code_Div2" class="OH_CodeSnippetContainerCode" style="display: none"><pre xml:space="preserve"><span class="keyword">Public</span> <span class="keyword">Interface</span> <span class="identifier">IFilter</span> | |
| <span class="keyword">Inherits</span> <span class="identifier">IOptionHandler</span></pre></div><div id="ID0EDCA_code_Div3" class="OH_CodeSnippetContainerCode" style="display: none"><pre xml:space="preserve"><span class="keyword">public</span> <span class="keyword">interface class</span> <span class="identifier">IFilter</span> : <span class="identifier">IOptionHandler</span></pre></div><div id="ID0EDCA_code_Div4" class="OH_CodeSnippetContainerCode" style="display: none"><pre xml:space="preserve"><span class="keyword">type</span> <span class="identifier">IFilter</span> = | |
| <span class="keyword">interface</span> | |
| <span class="keyword">interface</span> <span class="identifier">IOptionHandler</span> | |
| <span class="keyword">end</span></pre></div></div></div><script type="text/javascript">AddLanguageTabSet("ID0EDCA");</script><p>The <span class="selflink">IFilter</span> type exposes the following members.</p><div class="OH_CollapsibleAreaRegion"><div class="OH_regiontitle">Properties</div><div class="OH_CollapsibleArea_HrDiv"><hr class="OH_CollapsibleArea_Hr" /></div></div><div class="OH_clear"> </div><table id="memberList" class="members"><tr><th class="ps_iconColumn"> | |
| </th><th>Name</th><th>Description</th></tr><tr data="public;declared;notNetfw;"><td><img src="../icons/pubproperty.gif" alt="Public property" title="Public property" /></td><td><a href="P_log4net_Filter_IFilter_Next.htm">Next</a></td><td><div class="summary"> | |
| Property to get and set the next filter | |
| </div></td></tr></table><a href="#mainBody">Top</a><div class="OH_CollapsibleAreaRegion"><div class="OH_regiontitle">Methods</div><div class="OH_CollapsibleArea_HrDiv"><hr class="OH_CollapsibleArea_Hr" /></div></div><div class="OH_clear"> </div><table id="memberList" class="members"><tr><th class="ps_iconColumn"> | |
| </th><th>Name</th><th>Description</th></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="M_log4net_Core_IOptionHandler_ActivateOptions.htm">ActivateOptions</a></td><td><div class="summary"> | |
| Activate the options that were previously set with calls to properties. | |
| </div> (Inherited from <a href="T_log4net_Core_IOptionHandler.htm">IOptionHandler</a>.)</td></tr><tr data="public;declared;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="M_log4net_Filter_IFilter_Decide.htm">Decide</a></td><td><div class="summary"> | |
| Decide if the logging event should be logged through an appender. | |
| </div></td></tr></table><a href="#mainBody">Top</a><div class="OH_CollapsibleAreaRegion"><div class="OH_regiontitle">Remarks</div><div class="OH_CollapsibleArea_HrDiv"><hr class="OH_CollapsibleArea_Hr" /></div></div><div class="OH_clear"> </div><p> | |
| Users should implement this interface to implement customized logging | |
| event filtering. Note that <a href="T_log4net_Repository_Hierarchy_Logger.htm">Logger</a> and | |
| <a href="T_log4net_Appender_AppenderSkeleton.htm">AppenderSkeleton</a>, the parent class of all standard | |
| appenders, have built-in filtering rules. It is suggested that you | |
| first use and understand the built-in rules before rushing to write | |
| your own custom filters. | |
| </p><p> | |
| This abstract class assumes and also imposes that filters be | |
| organized in a linear chain. The <a href="M_log4net_Filter_IFilter_Decide.htm">Decide(LoggingEvent)</a> | |
| method of each filter is called sequentially, in the order of their | |
| addition to the chain. | |
| </p><p> | |
| The <a href="M_log4net_Filter_IFilter_Decide.htm">Decide(LoggingEvent)</a> method must return one | |
| of the integer constants <a href="T_log4net_Filter_FilterDecision.htm">Deny</a>, | |
| <a href="T_log4net_Filter_FilterDecision.htm">Neutral</a> or <a href="T_log4net_Filter_FilterDecision.htm">Accept</a>. | |
| </p><p> | |
| If the value <a href="T_log4net_Filter_FilterDecision.htm">Deny</a> is returned, then the log event is dropped | |
| immediately without consulting with the remaining filters. | |
| </p><p> | |
| If the value <a href="T_log4net_Filter_FilterDecision.htm">Neutral</a> is returned, then the next filter | |
| in the chain is consulted. If there are no more filters in the | |
| chain, then the log event is logged. Thus, in the presence of no | |
| filters, the default behavior is to log all logging events. | |
| </p><p> | |
| If the value <a href="T_log4net_Filter_FilterDecision.htm">Accept</a> is returned, then the log | |
| event is logged without consulting the remaining filters. | |
| </p><p> | |
| The philosophy of log4net filters is largely inspired from the | |
| Linux ipchains. | |
| </p><div class="OH_CollapsibleAreaRegion" id="seeAlsoSection"><div class="OH_regiontitle">See Also</div><div class="OH_CollapsibleArea_HrDiv"><hr class="OH_CollapsibleArea_Hr" /></div></div><div class="OH_clear"> </div><h4 class="subHeading">Reference</h4><div class="seeAlsoStyle"><a href="N_log4net_Filter.htm">log4net.Filter Namespace</a></div></div></div></div></div><div id="OH_footer" class="OH_footer">Apache log4net, Apache and log4net are trademarks of The Apache Software Foundation.<p><a href="http://logging.apache.org/log4net/" target="_blank">Copyright 2004-2017 The Apache Software Foundation</a></p><div class="OH_feedbacklink">Send comments on this topic to | |
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