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POPerformance of static methods vs instance methods
 

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    <p>My question is relating to the performance characteristics of static methods vs instance methods and their scalability. Assume for this scenario that all class definitions are in a single assembly and that multiple discrete pointer types are required.</p> <p>Consider:</p> <pre><code>public sealed class InstanceClass { public int DoOperation1(string input) { // Some operation. } public int DoOperation2(string input) { // Some operation. } // … more instance methods. } public static class StaticClass { public static int DoOperation1(string input) { // Some operation. } public static int DoOperation2(string input) { // Some operation. } // … more static methods. } </code></pre> <p>The above classes represent a helper style pattern.</p> <p>In an instance class, resolving the instance method take a moment to do as oppose to StaticClass.</p> <p>My questions are:</p> <ol> <li><p>When keeping state is not a concern (no fields or properties are required), is it always better to use a static class?</p></li> <li><p>Where there is a considerable number of these static class definitions (say 100 for example, with a number of static methods each) will this affect execution performance or memory consumption negatively as compared with the same number of instance class definitions?</p></li> <li><p>When another method within the same instance class is called, does the instance resolution still occur? For example using the [this] keyword like <code>this.DoOperation2("abc")</code> from within <code>DoOperation1</code> of the same instance.</p></li> </ol>
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    1. COpossible duplicate of [Performance of using static methods vs instantiating the class containing the methods](http://stackoverflow.com/questions/202631/performance-of-using-static-methods-vs-instantiating-the-class-containing-the-me)
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    2. COwhat do you mean by "instance resolution"? On the IL level, "this" pointer is available just as any other local variable. In fact, on some old CLR/JIT versions, you could call an instance-method on a NULL providing it did not touch the 'this' - the code just flied through and crashed on nothing.. now CLR/JIT contains explicit null-check on every member invoke..
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    3. CO> http://www.vijaymukhi.com/documents/books/ilbook/chap8.htm and 'call instance' versus just 'call'. The former expects 'this' parameter and the latter - doesnt.
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