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<title>OptionConverter.SubstituteVariables Method</title>
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<h1 class="dtH1">OptionConverter.SubstituteVariablesMethod</h1>
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<p> Performs variable substitution in string <i>val</i> from the values of keys found in <i>props</i>. </p>
<div class="syntax">
<span class="lang">[VisualBasic]</span>
<br />PublicSharedFunctionSubstituteVariables( _<br />ByVal <i>value</i>As<a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemStringClassTopic.asp">String</a>,_<br />ByVal <i>props</i>As<a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemCollectionsIDictionaryClassTopic.asp">IDictionary</a>_<br />)As<a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemStringClassTopic.asp">String</a></div>
<div class="syntax">
<span class="lang">[C#]</span>
<br />publicstatic<a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemStringClassTopic.asp">string</a>SubstituteVariables(<br /><a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemStringClassTopic.asp">string</a><i>value</i>,<br /><a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemCollectionsIDictionaryClassTopic.asp">IDictionary</a><i>props</i><br />);</div>
<h4 class="dtH4">Parameters</h4>
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<i>value</i>
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<dd>The string on which variable substitution is performed.</dd>
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<i>props</i>
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<dd>The dictionary to use to lookup variables.</dd>
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<h4 class="dtH4">Return Value</h4>
<p>The result of the substitutions.</p>
<h4 class="dtH4">Remarks</h4>
<p> The variable substitution delimiters are <b>${</b> and <b>}</b>. </p>
<p> For example, if props contains <code>key=value</code>, then the call </p>
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<pre class="code"><span class="lang">[C#]
</span>string s = OptionConverter.SubstituteVariables("Value of key is ${key}.");
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<p> will set the variable <code>s</code> to "Value of key is value.". </p>
<p> If no value could be found for the specified key, then substitution defaults to an empty string. </p>
<p> For example, if system properties contains no value for the key "nonExistentKey", then the call </p>
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<pre class="code"><span class="lang">[C#]
</span>string s = OptionConverter.SubstituteVariables("Value of nonExistentKey is [${nonExistentKey}]");
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<p> will set <s>s</s> to "Value of nonExistentKey is []". </p>
<p> An Exception is thrown if <i>value</i> contains a start delimiter "${" which is not balanced by a stop delimiter "}". </p>
<h4 class="dtH4">See Also</h4><p><a href="log4net.Util.OptionConverter.html">OptionConverter Class</a> | <a href="log4net.Util.html">log4net.Util Namespace</a></p><hr /><div id="footer"><p><a href="http://logging.apache.org/log4net">Copyright 2001-2006 The Apache Software Foundation.</a></p><p>Generated from assembly log4net [1.2.10.0]</p></div></div>
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