﻿<html xmlns:MSHelp="http://msdn.microsoft.com/mshelp" xmlns:mshelp="http://msdn.microsoft.com/mshelp"><head><link rel="SHORTCUT ICON" href="./../icons/favicon.ico" /><style type="text/css">.OH_CodeSnippetContainerTabLeftActive, .OH_CodeSnippetContainerTabLeft,.OH_CodeSnippetContainerTabLeftDisabled { backgroundImageName: tabLeftBG.gif; }.OH_CodeSnippetContainerTabRightActive, .OH_CodeSnippetContainerTabRight,.OH_CodeSnippetContainerTabRightDisabled { backgroundImageName: tabRightBG.gif; }.OH_footer { backgroundImageName: footer_slice.gif; background-position: top; background-repeat: repeat-x; }</style><link rel="stylesheet" type="text/css" href="./../styles/branding.css" /><link rel="stylesheet" type="text/css" href="./../styles/branding-en-US.css" /><style type="text/css">
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		</style><script src="./../scripts/branding.js" type="text/javascript"><!----></script><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>ILogExtensions.ErrorFormatExt Method (ILog, String, Object[])</title><meta name="Language" content="en-us" /><meta name="Microsoft.Help.Id" content="M:log4net.Util.ILogExtensions.ErrorFormatExt(log4net.ILog,System.String,System.Object[])" /><meta name="Description" content="Logs a formatted message string with the level." /><meta name="Microsoft.Help.ContentType" content="Reference" /><meta name="BrandingAware" content="'true'" /><meta name="container" content="log4net.Util" /><meta name="file" content="M_log4net_Util_ILogExtensions_ErrorFormatExt_4" /><meta name="guid" content="M_log4net_Util_ILogExtensions_ErrorFormatExt_4" /><link type="text/css" rel="stylesheet" href="ms-help://Hx/HxRuntime/HxLink.css" /><meta name="SelfBranded" content="true" /></head><body onload="onLoad()" class="primary-mtps-offline-document"><div class="OH_outerDiv"><div class="OH_outerContent"><table class="TitleTable"><tr><td class="OH_tdTitleColumn">ILogExtensions<span id="ID0EFBABAAA"> </span><script type="text/javascript">
					addToLanSpecTextIdSet("ID0EFBABAAA?vb=.|cpp=::|cs=.|fs=.|nu=.");
				</script>ErrorFormatExt Method (ILog, String, <span id="ID0EDBABAAA"> </span><script type="text/javascript">
					addToLanSpecTextIdSet("ID0EDBABAAA?vb=|cpp=array&lt;|cs=|fs=|nu=");
				</script>Object<span id="ID0EBBABAAA"> </span><script type="text/javascript">
					addToLanSpecTextIdSet("ID0EBBABAAA?vb=()|cpp=&gt;|cs=[]|fs=[]|nu=[]");
				</script>)</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">
            Logs a formatted message string with the <a href="F_log4net_Core_Level_Error.htm" target="">Error</a> level.
            </div><p></p><b>Namespace:</b> <a href="N_log4net_Util.htm" target="">log4net.Util</a><br /><b>Assembly:</b> <span sdata="assembly">log4net</span> (in log4net.dll) Version: 1.2.14.0 (1.2.14.0)<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 id="snippetGroup_Syntax" class="code"><div id="ID0ECJDAAAAA" class="OH_CodeSnippetContainer"><div class="OH_CodeSnippetContainerTabs" id="ID0ECJDAAAAA_tabs"><div class="OH_CodeSnippetContainerTabLeftActive" id="ID0ECJDAAAAA_tabimgleft"></div><div id="ID0ECJDAAAAA_tab1" class="OH_CodeSnippetContainerTabActive" EnableCopyCode="true"><a href="#" onclick="javascript:ChangeTab('ID0ECJDAAAAA','C#','1','4');return false;">C#</a></div><div id="ID0ECJDAAAAA_tab2" class="OH_CodeSnippetContainerTab" EnableCopyCode="true"><a href="#" onclick="javascript:ChangeTab('ID0ECJDAAAAA','Visual Basic','2','4');return false;">VB</a></div><div id="ID0ECJDAAAAA_tab3" class="OH_CodeSnippetContainerTab" EnableCopyCode="true"><a href="#" onclick="javascript:ChangeTab('ID0ECJDAAAAA','Visual C++','3','4');return false;">C++</a></div><div id="ID0ECJDAAAAA_tab4" class="OH_CodeSnippetContainerTabDisabledNotFirst" EnableCopyCode="true" disabled="true"><a>F#</a></div><div class="OH_CodeSnippetContainerTabRight" id="ID0ECJDAAAAA_tabimgright"></div></div><div id="ID0ECJDAAAAA_codecollection" class="OH_CodeSnippetContainerCodeCollection"><div class="OH_CodeSnippetToolBar"><div class="OH_CodeSnippetToolBarText"><a id="ID0ECJDAAAAA_ViewColorized" href="#" onclick="javascript:ExchangeTitleContent('ID0ECJDAAAAA','4')" title="View Colorized" style="display: none">View Colorized</a><a id="ID0ECJDAAAAA_copycode" href="#" onclick="javascript:CopyToClipboard('ID0ECJDAAAAA','4')" title="Copy to Clipboard">Copy to Clipboard</a><a id="ID0ECJDAAAAA_PrintText" class="OH_PrintText" href="#" onclick="javascript:Print('ID0ECJDAAAAA','4')" title="Print">Print</a></div></div><div id="ID0ECJDAAAAA_code_Div1" class="OH_CodeSnippetContainerCode" style="display: block"><pre><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">ErrorFormatExt</span>(
	<span class="keyword">this</span> <span class="identifier">ILog</span> <span class="parameter">logger</span>,
	<span class="identifier">string</span> <span class="parameter">format</span>,
	<span class="keyword">params</span> <span class="identifier">Object</span>[] <span class="parameter">args</span>
)</pre></div><div id="ID0ECJDAAAAA_code_Plain_Div1" class="OH_CodeSnippetContainerCode" style="display: none"><pre>public static void ErrorFormatExt(
	this ILog logger,
	string format,
	params Object[] args
)</pre></div><div id="ID0ECJDAAAAA_code_Div2" class="OH_CodeSnippetContainerCode" style="display: none"><pre>&lt;<span class="identifier">ExtensionAttribute</span>&gt; 
<span class="keyword">Public</span> <span class="keyword">Shared</span> <span class="keyword">Sub</span> <span class="identifier">ErrorFormatExt</span> ( 
	<span class="parameter">logger</span> <span class="keyword">As</span> <span class="identifier">ILog</span>,
	<span class="parameter">format</span> <span class="keyword">As</span> <span class="identifier">String</span>,
	<span class="keyword">ParamArray</span> <span class="parameter">args</span> <span class="keyword">As</span> <span class="identifier">Object</span>()
)</pre></div><div id="ID0ECJDAAAAA_code_Plain_Div2" class="OH_CodeSnippetContainerCode" style="display: none"><pre>&lt;ExtensionAttribute&gt; 
Public Shared Sub ErrorFormatExt ( 
	logger As ILog,
	format As String,
	ParamArray args As Object()
)</pre></div><div id="ID0ECJDAAAAA_code_Div3" class="OH_CodeSnippetContainerCode" style="display: none"><pre><span class="keyword">public</span>:
[<span class="identifier">ExtensionAttribute</span>]
<span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">ErrorFormatExt</span>(
	<span class="identifier">ILog</span>^ <span class="parameter">logger</span>, 
	<span class="identifier">String</span>^ <span class="parameter">format</span>, 
	... <span class="keyword">array</span>&lt;<span class="identifier">Object</span>^&gt;^ <span class="parameter">args</span>
)</pre></div><div id="ID0ECJDAAAAA_code_Plain_Div3" class="OH_CodeSnippetContainerCode" style="display: none"><pre>public:
[ExtensionAttribute]
static void ErrorFormatExt(
	ILog^ logger, 
	String^ format, 
	... array&lt;Object^&gt;^ args
)</pre></div><div id="ID0ECJDAAAAA_code_Div4" class="OH_CodeSnippetContainerCode" style="display: none"><pre /></div><div id="ID0ECJDAAAAA_code_Plain_Div4" class="OH_CodeSnippetContainerCode" style="display: none"><pre /></div></div></div><script>addSpecificTextLanguageTagSet('ID0ECJDAAAAA');</script></div><div id="parameters"><h4 class="subHeading">Parameters</h4><dl paramName="logger"><dt><span class="parameter">logger</span></dt><dd>Type: <a href="T_log4net_ILog.htm" target="">log4net<span id="ID0EBCACIDAAAAA"> </span><script type="text/javascript">
					addToLanSpecTextIdSet("ID0EBCACIDAAAAA?vb=.|cpp=::|cs=.|fs=.|nu=.");
				</script>ILog</a><br /><span>The logger on which the message is logged.</span></dd></dl><dl paramName="format"><dt><span class="parameter">format</span></dt><dd>Type: <img src="./../icons/online_icon.gif" class="OH_offlineIcon" alt="Online" title="Online" /><a href="http://msdn2.microsoft.com/en-us/library/s1wwdcbf" target="_blank">System<span id="ID0EBCABIDAAAAA"> </span><script type="text/javascript">
					addToLanSpecTextIdSet("ID0EBCABIDAAAAA?vb=.|cpp=::|cs=.|fs=.|nu=.");
				</script>String</a><br /><span>A String containing zero or more format items</span></dd></dl><dl paramName="args"><dt><span class="parameter">args</span></dt><dd>Type: <span id="ID0EEAAIDAAAAA"> </span><script type="text/javascript">
					addToLanSpecTextIdSet("ID0EEAAIDAAAAA?vb=|cpp=array&lt;|cs=|fs=|nu=");
				</script><img src="./../icons/online_icon.gif" class="OH_offlineIcon" alt="Online" title="Online" /><a href="http://msdn2.microsoft.com/en-us/library/e5kfa45b" target="_blank">System<span id="ID0EBDAAIDAAAAA"> </span><script type="text/javascript">
					addToLanSpecTextIdSet("ID0EBDAAIDAAAAA?vb=.|cpp=::|cs=.|fs=.|nu=.");
				</script>Object</a><span id="ID0ECAAIDAAAAA"> </span><script type="text/javascript">
					addToLanSpecTextIdSet("ID0ECAAIDAAAAA?vb=()|cpp=&gt;|cs=[]|fs=[]|nu=[]");
				</script><br /><span>An Object array containing zero or more objects to format</span></dd></dl></div><h4 class="subHeading">Usage Note</h4>In Visual Basic and C#, you can call this method as an instance method on any object of type <a href="T_log4net_ILog.htm" target="">ILog</a>. When you use instance method syntax to call this method, omit the first parameter. For more information, see <img src="./../icons/online_icon.gif" class="OH_offlineIcon" alt="Online" title="Online" /><a href="http://msdn.microsoft.com/en-us/library/bb384936.aspx" target="_blank">Extension Methods (Visual Basic)</a> or <img src="./../icons/online_icon.gif" class="OH_offlineIcon" alt="Online" title="Online" /><a href="http://msdn.microsoft.com/en-us/library/bb383977.aspx" target="_blank">Extension Methods (C# Programming Guide)</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>
            The message is formatted using the <span class="code">String.Format</span> method. See
            <img src="./../icons/online_icon.gif" class="OH_offlineIcon" alt="Online" title="Online" /><a href="http://msdn2.microsoft.com/en-us/library/b1csw23d" target="_blank">Format(String, <span id="ID0EDBBCAAAAA"> </span><script type="text/javascript">
					addToLanSpecTextIdSet("ID0EDBBCAAAAA?vb=|cpp=array&lt;|cs=|fs=|nu=");
				</script>Object<span id="ID0EBBBCAAAAA"> </span><script type="text/javascript">
					addToLanSpecTextIdSet("ID0EBBBCAAAAA?vb=()|cpp=&gt;|cs=[]|fs=[]|nu=[]");
				</script>)</a> for details of the syntax of the format string and the behavior
            of the formatting.
            </p><p>
            This method does not take an <img src="./../icons/online_icon.gif" class="OH_offlineIcon" alt="Online" title="Online" /><a href="http://msdn2.microsoft.com/en-us/library/c18k6c59" target="_blank">Exception</a> object to include in the
            log event. To pass an <img src="./../icons/online_icon.gif" class="OH_offlineIcon" alt="Online" title="Online" /><a href="http://msdn2.microsoft.com/en-us/library/c18k6c59" target="_blank">Exception</a> use one of the <a href="M_log4net_Util_ILogExtensions_ErrorExt_3.htm" target="">ErrorExt(ILog, Object, Exception)</a>
            methods instead.
            </p><a name="seeAlsoSection"><!----></a><div class="OH_CollapsibleAreaRegion"><div class="OH_regiontitle">See Also</div><div class="OH_CollapsibleArea_HrDiv"><hr class="OH_CollapsibleArea_Hr" /></div></div><div class="OH_clear"></div><div class="seeAlsoStyle"><a href="T_log4net_Util_ILogExtensions.htm" target="">ILogExtensions Class</a></div><div class="seeAlsoStyle"><a href="AllMembers_T_log4net_Util_ILogExtensions.htm" target="">ILogExtensions Members</a></div><div class="seeAlsoStyle"><a href="Overload_log4net_Util_ILogExtensions_ErrorFormatExt.htm" target="">ErrorFormatExt Overload</a></div><div class="seeAlsoStyle"><a href="N_log4net_Util.htm" target="">log4net.Util Namespace</a></div><div class="seeAlsoStyle"><a href="M_log4net_ILog_Error.htm" target="">ILog<span id="ID0EBABAAAAAA"> </span><script type="text/javascript">
					addToLanSpecTextIdSet("ID0EBABAAAAAA?vb=.|cpp=::|cs=.|fs=.|nu=.");
				</script>Error(Object)</a></div><div class="seeAlsoStyle"><a href="P_log4net_ILog_IsErrorEnabled.htm" target="">ILog<span id="ID0EBAAAAAAAA"> </span><script type="text/javascript">
					addToLanSpecTextIdSet("ID0EBAAAAAAAA?vb=.|cpp=::|cs=.|fs=.|nu=.");
				</script>IsErrorEnabled</a></div></div></div></div></div><div id="OH_footer" class="OH_footer"><p>Apache log4net, Apache and log4net are trademarks of The Apache Software Foundation.</p><p><a href="http://logging.apache.org/log4net/" target="_blank"><img src="./../icons/online_icon.gif" class="OH_offlineIcon" alt="Online" title="Online" /> 
						Copyright 2004-2015 The Apache Software Foundation (http://logging.apache.org/log4net/)</a></p><div class="OH_feedbacklink"><a href="mailto:http://logging.apache.org/log4net/mail-lists.html?subject=Apache+log4net%e2%84%a2+SDK+Documentation+ILogExtensions.ErrorFormatExt+Method+(ILog%2c+String%2c+Object%5b%5d)+100+EN-US&amp;body=Your%20feedback%20is%20used%20to%20improve%20the%20documentation%20and%20the%20product.%20Your%20e-mail%20address%20will%20not%20be%20used%20for%20any%20other%20purpose%20and%20is%20disposed%20of%20after%20the%20issue%20you%20report%20is%20resolved.%20While%20working%20to%20resolve%20the%20issue%20that%20you%20report%2c%20you%20may%20be%20contacted%20via%20e-mail%20to%20get%20further%20details%20or%20clarification%20on%20the%20feedback%20you%20sent.%20After%20the%20issue%20you%20report%20has%20been%20addressed%2c%20you%20may%20receive%20an%20e-mail%20to%20let%20you%20know%20that%20your%20feedback%20has%20been%20addressed.">Send Feedback</a> on this topic to http://logging.apache.org/log4net/mail-lists.html.</div></div></body></html>