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POIs it more efficient to replace methods from a class into extension methods?
 

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  1. POIs it more efficient to replace methods from a class into extension methods?
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    <p>I recursively find all the files in a directory using <a href="https://stackoverflow.com/a/724184/637142">this</a> apreach which is realy fast.</p> <p>anyways I store the info in each file in the struct:</p> <pre><code>struct Info { public bool IsDirectory; public string Path; public FILETIME ModifiedDate; } </code></pre> <p><strong>So now I am trying to decide weather to place the helper methods inside that struct or somewhere else for efficiency purposes.</strong></p> <p>The helper methods are:</p> <pre><code>struct Info { public bool IsDirectory; public string Path; public FILETIME ModifiedDate; // Helper methods: public string GetFileName(){ /* implementation */ } public string GetFileSize(){ /* implementation */ } public string GetFileAtributes() { /* implementation */ } // etc many more helper methods } </code></pre> <p>I am saving thousands of files on memory and I don't know if having those methods inside Info will affect performance. In other words will it be better to remove those methods and make them extension methods as:</p> <pre><code>public static class ExtensionHelperMethods { static public string GetFileName(this Info info){ /* implementation */ } static public string GetFileSize(this Info info){ /* implementation */ } static public string GetFileAtributes(this Info info) { /* implementation */ } // etc many more helper methods } </code></pre> <p><strong>So my question is</strong> because <code>Info</code> is an instance struct then having those methods inside result in wising more memory? If <code>Info</code> is an instance struct then each method will have a different address in memory?</p> <p>I have tried both techniques and I cannot seemed to see a difference. Maybe I need to try with more files.</p> <hr> <h2>Edit</h2> <p>Here is to prove that <a href="https://stackoverflow.com/users/250329/fabio-gouw">@Fabio Gouw</a> is wright:</p> <pre><code>// This program compares the size of object a and b class Program { static void Main(string[] args) { InfoA a = new InfoA(); InfoB b = new InfoB(); if (ToBytes(a).Length == ToBytes(b).Length) { Console.Write("Objects are the same size!!!"); } Console.Read(); } public static byte[] ToBytes(object objectToSerialize) { BinaryFormatter bf = new BinaryFormatter(); MemoryStream memStr = new MemoryStream(); try { bf.Serialize(memStr, objectToSerialize); memStr.Position = 0; var ret = memStr.ToArray(); return ret; } finally { memStr.Close(); } } [Serializable] struct InfoA { public bool IsDirectory; public string Path; } [Serializable] struct InfoB { public bool IsDirectory; public string Path; public string GetFileName() { return System.IO.Path.GetFileName(Path); } } } </code></pre>
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    1. COThere's no such thing as an "instance struct".
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      1. USPeter Ritchie
    2. COThere's no real reason to use extension methods when you have control of the class/struct. Unless you've put the class into production and don't want to change it (for versioning reasons), releasing an extension method out-of-band would allow you to extend the class without changing it. Also, if you wanted to provide code for use with an interface, extension methods are useful. As for performance, I know of no documentation that details extension methods are more or less performant than member methods.
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