﻿<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>Hierarchy.Exists Method </title><meta name="Language" content="en-us" /><meta name="System.Keywords" content="Exists method" /><meta name="System.Keywords" content="Hierarchy.Exists method" /><meta name="Microsoft.Help.F1" content="log4net.Repository.Hierarchy.Hierarchy.Exists" /><meta name="Microsoft.Help.Id" content="M:log4net.Repository.Hierarchy.Hierarchy.Exists(System.String)" /><meta name="Description" content="Test if a logger exists" /><meta name="Microsoft.Help.ContentType" content="Reference" /><meta name="BrandingAware" content="true" /><meta name="container" content="log4net.Repository.Hierarchy" /><meta name="file" content="M_log4net_Repository_Hierarchy_Hierarchy_Exists" /><meta name="guid" content="M_log4net_Repository_Hierarchy_Hierarchy_Exists" /></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">Hierarchy<span id="LST78C58EA5_0"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST78C58EA5_0?cpp=::|nu=.");</script>Exists Method </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">
            Test if a logger exists
            </div><p> </p><strong>Namespace:</strong> <a href="N_log4net_Repository_Hierarchy.htm">log4net.Repository.Hierarchy</a><br /><strong>Assembly:</strong> log4net (in log4net.dll) Version: 2.0.6.0-.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">override</span> <span class="identifier">ILogger</span> <span class="identifier">Exists</span>(
	<span class="identifier">string</span> <span class="parameter">name</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">Overrides</span> <span class="keyword">Function</span> <span class="identifier">Exists</span> ( 
	<span class="parameter">name</span> <span class="keyword">As</span> <span class="identifier">String</span>
) <span class="keyword">As</span> <span class="identifier">ILogger</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">virtual</span> <span class="identifier">ILogger</span>^ <span class="identifier">Exists</span>(
	<span class="identifier">String</span>^ <span class="parameter">name</span>
) <span class="keyword">override</span></pre></div><div id="ID0EDCA_code_Div4" class="OH_CodeSnippetContainerCode" style="display: none"><pre xml:space="preserve"><span class="keyword">abstract</span> <span class="identifier">Exists</span> : 
        <span class="parameter">name</span> : <span class="identifier">string</span> <span class="keyword">-&gt;</span> <span class="identifier">ILogger</span> 
<span class="keyword">override</span> <span class="identifier">Exists</span> : 
        <span class="parameter">name</span> : <span class="identifier">string</span> <span class="keyword">-&gt;</span> <span class="identifier">ILogger</span> </pre></div></div></div><script type="text/javascript">AddLanguageTabSet("ID0EDCA");</script><h4 class="subHeading">Parameters</h4><dl><dt><span class="parameter">name</span></dt><dd>Type: <a href="http://msdn2.microsoft.com/en-us/library/s1wwdcbf" target="_blank">System<span id="LST78C58EA5_1"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST78C58EA5_1?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>String</a><br />The name of the logger to lookup</dd></dl><h4 class="subHeading">Return Value</h4>Type: <a href="T_log4net_Core_ILogger.htm">ILogger</a><br />The Logger object with the name specified<h4 class="subHeading">Implements</h4><a href="M_log4net_Repository_ILoggerRepository_Exists.htm">ILoggerRepository<span id="LST78C58EA5_2"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST78C58EA5_2?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>Exists(String)</a><br /><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>
            Check if the named logger exists in the hierarchy. If so return
            its reference, otherwise returns <span class="code">null</span>.
            </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="T_log4net_Repository_Hierarchy_Hierarchy.htm">Hierarchy Class</a></div><div class="seeAlsoStyle"><a href="N_log4net_Repository_Hierarchy.htm">log4net.Repository.Hierarchy 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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