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Why does Visual Studio by default create a private static method when refactoring code and selecting extract method?
If I'm refactoring a non-static class and the method is only visible within the class why is it static?
Is there some performance benefit by calling a private static method within a non-static class compared to a non-static method within a non-static class?
Is it for readability to simply show that the method does not rely on any member variables of the class?
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No object exists before main. So main must be invoked without any object Hence main is declared as a "static member" function, because static functions can be called without any object. If you declare a method as static then you don't have to call it by creating an object of the class.
Extract Method refactoring is a process of improving the structure of code by creating a new method from an existing code block, and replacing the original code block with a call to the new method. This improves the readability and maintainability of the code.
The Extract Method refactoring lets you take a code fragment that can be grouped, move it into a separated method, and replace the old code with a call to the method.
Why does Visual Studio by default create a private static method when refactoring code and selecting extract method?
It does this only if your method doesn't access any member variables/methods/properties. This is good because it basically operates on the principle of least assumptions: since you don't access instance-specific data, might as well make the method static.
Is there some performance benefit by calling a private static method within a non-static class compared to a non-static method within a non-static class?
Theoretically, there might be but I doubt it. However, making the method static makes it clear that it will not access or modify instance data, which I find a useful hint.
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Creating a static method may be considered a performance enhancement because there is no "this" pointer to pass as a variable. I use ReSharper and it always recommends turning methods into static whenever they don't refer to a class variable.
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