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POCode Analysis c# .NET CA1822
 

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    <p>I run Code Analysis and got this message:</p> <blockquote> <p>CA1822 : Microsoft.Performance : The 'this' parameter (or 'Me' in Visual Basic) of 'CreateIntervalString(TimeSpan)' is never used. Mark the member as static (or Shared in Visual Basic) or use 'this'/'Me' in the method body or at least one property accessor, if appropriate.</p> </blockquote> <p>My code is:</p> <pre><code>private string CreateIntervalString(TimeSpan timeSpan) { return timeSpan.ToString(); } </code></pre> <p>as I understood, because <code>CreateIntervalString</code> function does not use any the members of the class, and only uses on the timeSpan input, VisualStudio recommends me to mark it as static.</p> <p>My Questions:</p> <ol> <li><strong>Why</strong> when I mark it as static, the performance is improved?</li> <li>My function is part of library that should be thread-safe, does marking method as static prevent this?</li> <li>I have additional private functions that use only its inputs, and does not use at any other members of the class, yet I don't get the same error for them.</li> </ol> <p>Thanks a lot! </p> <p>Examples:</p> <p>the following method provides an error:</p> <pre><code> private string CreateIntervalString(TimeSpan timeSpan) { return timeSpan.ToString(); } </code></pre> <p>and the following does not:</p> <pre><code> private DateTime ParseDateString(string dateTimeString) { // the years,monthe,days,hours,minutes and secondes found by the dateTimeString input return new DateTime(years, months, days, hours, minutes, secondes); } </code></pre>
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