﻿<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>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_1" /><meta name="guid" content="M_log4net_Util_ILogExtensions_ErrorFormatExt_1" /></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">ILogExtensions<span id="LSTADF5EB10_0"></span><script type="text/javascript">AddLanguageSpecificTextSet("LSTADF5EB10_0?cpp=::|nu=.");</script>ErrorFormatExt Method (ILog, String, Object)</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">Error</a> level.
            </div><p> </p><strong>Namespace:</strong> <a href="N_log4net_Util.htm">log4net.Util</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">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="identifier">Object</span> <span class="parameter">arg0</span>
)</pre></div><div id="ID0EDCA_code_Div2" class="OH_CodeSnippetContainerCode" style="display: none"><pre xml:space="preserve">&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="parameter">arg0</span> <span class="keyword">As</span> <span class="identifier">Object</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="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="identifier">Object</span>^ <span class="parameter">arg0</span>
)</pre></div><div id="ID0EDCA_code_Div4" class="OH_CodeSnippetContainerCode" style="display: none"><pre xml:space="preserve">[&lt;<span class="identifier">ExtensionAttribute</span>&gt;]
<span class="keyword">static</span> <span class="keyword">member</span> <span class="identifier">ErrorFormatExt</span> : 
        <span class="parameter">logger</span> : <span class="identifier">ILog</span> * 
        <span class="parameter">format</span> : <span class="identifier">string</span> * 
        <span class="parameter">arg0</span> : <span class="identifier">Object</span> <span class="keyword">-&gt;</span> <span class="keyword">unit</span> 
</pre></div></div></div><script type="text/javascript">AddLanguageTabSet("ID0EDCA");</script><h4 class="subHeading">Parameters</h4><dl><dt><span class="parameter">logger</span></dt><dd>Type: <a href="T_log4net_ILog.htm">log4net<span id="LSTADF5EB10_1"></span><script type="text/javascript">AddLanguageSpecificTextSet("LSTADF5EB10_1?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>ILog</a><br />The logger on which the message is logged.</dd><dt><span class="parameter">format</span></dt><dd>Type: <a href="http://msdn2.microsoft.com/en-us/library/s1wwdcbf" target="_blank">System<span id="LSTADF5EB10_2"></span><script type="text/javascript">AddLanguageSpecificTextSet("LSTADF5EB10_2?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>String</a><br />A String containing zero or more format items</dd><dt><span class="parameter">arg0</span></dt><dd>Type: <a href="http://msdn2.microsoft.com/en-us/library/e5kfa45b" target="_blank">System<span id="LSTADF5EB10_3"></span><script type="text/javascript">AddLanguageSpecificTextSet("LSTADF5EB10_3?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>Object</a><br />An Object to format</dd></dl><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">ILog</a>. When you use instance method syntax to call this method, omit the first parameter. For more information, see <a href="http://msdn.microsoft.com/en-us/library/bb384936.aspx" target="_blank">Extension Methods (Visual Basic)</a> or <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
            <a href="http://msdn2.microsoft.com/en-us/library/b1csw23d" target="_blank">Format(String, <span id="LSTADF5EB10_4"></span><script type="text/javascript">AddLanguageSpecificTextSet("LSTADF5EB10_4?cpp=array&lt;");</script>Object<span id="LSTADF5EB10_5"></span><script type="text/javascript">AddLanguageSpecificTextSet("LSTADF5EB10_5?cpp=&gt;|cs=[]|vb=()|nu=[]|fs=[]");</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 <a href="http://msdn2.microsoft.com/en-us/library/c18k6c59" target="_blank">Exception</a> object to include in the
            log event. To pass an <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">ErrorExt(ILog, Object, Exception)</a>
            methods instead.
            </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_Util_ILogExtensions.htm">ILogExtensions Class</a></div><div class="seeAlsoStyle"><a href="Overload_log4net_Util_ILogExtensions_ErrorFormatExt.htm">ErrorFormatExt Overload</a></div><div class="seeAlsoStyle"><a href="N_log4net_Util.htm">log4net.Util Namespace</a></div><div class="seeAlsoStyle"><a href="M_log4net_ILog_Error.htm">ILog<span id="LSTADF5EB10_6"></span><script type="text/javascript">AddLanguageSpecificTextSet("LSTADF5EB10_6?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>Error(Object)</a></div><div class="seeAlsoStyle"><a href="P_log4net_ILog_IsErrorEnabled.htm">ILog<span id="LSTADF5EB10_7"></span><script type="text/javascript">AddLanguageSpecificTextSet("LSTADF5EB10_7?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>IsErrorEnabled</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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