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    <h1>Available in Resharper 7 and above</h1> <pre><code>[ContractAnnotation("null=&gt;true")] public static bool IsNullOrWhiteSpace(this string s) </code></pre> <p>Your project isn't going to know what <code>ContractAnnotation</code> is. You need to add it to your project. The preferred method is via nuget:</p> <blockquote> <p>PM> Install-Package <a href="https://www.nuget.org/packages/JetBrains.Annotations" rel="nofollow">JetBrains.Annotations</a></p> </blockquote> <p>Alternatively you can directly embed the source into your project:</p> <blockquote> <p>Resharper -> Options -> Code Annotations -> Copy default implementation to clipboard</p> </blockquote> <p>Then paste that into a new file, eg Annotations.cs. The <code>ContractAnnotation</code> definition lives in that file. For an official article on ContractAnnotation see <a href="http://blogs.jetbrains.com/dotnet/2012/08/contract-annotations-in-resharper-7/" rel="nofollow">here</a></p> <hr> <h2>Previous answer (for non R#7 versions)</h2> <blockquote> <p>Is this hardcoded in R#?</p> </blockquote> <p>No, Resharper uses External Annotations to provide this functionality. <a href="http://blogs.jetbrains.com/dotnet/2010/11/resharper-nullreferenceexception-analysis-and-its-contracts/" rel="nofollow">This article</a> should answer all your questions, including a solution to provide your own external annotation for your <code>IsNullOrWhiteSpace</code> method.</p> <h3>Example</h3> <p><em>note: external annotations appear to only work on referenced libraries; if your reference is from a project the external annotations are not picked up; this is less than ideal</em></p> <p>Suppose you have your extension method in a class called <code>TempExtensions</code> which itself resides in an assembly named <code>ClassLibrary1</code></p> <p>You need to add a new file at this location</p> <blockquote> <p>C:\Program Files (x86)\JetBrains\ReSharper\v7.0\Bin\ExternalAnnotations.NETFramework.ExternalAnnotations\ClassLibrary1\ClassLibrary1.xml</p> </blockquote> <p>The contents of the xml should contain:</p> <pre><code>&lt;assembly name="ClassLibrary1"&gt; &lt;member name="M:ClassLibrary1.TempExtensions.IsNullOrWhiteSpace(System.String)"&gt; &lt;attribute ctor="M:JetBrains.Annotations.ContractAnnotationAttribute.#ctor(System.String,System.Boolean)"&gt; &lt;argument&gt;null=&amp;gt;true&lt;/argument&gt; &lt;argument&gt;true&lt;/argument&gt; &lt;/attribute&gt; &lt;/member&gt; &lt;/assembly&gt; </code></pre>
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    1. COI have tested it and it works! Also, thank you for giving a solution for the specific example that I gave.
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