a developer's notes – a semi-technical web development BLOG

January 24, 2012

Why is Main in a console app a Static method and why are its methods Static?

Filed under: C# — Duy Nguyen @ 8:47 am
Tags: , , , , , ,

http://stackoverflow.com/questions/1685692/c-sharp-console-application-static-methods
Here is a great explanation!

Member functions don’t have to be static; but if they are not static, that requires you to instantiate a Program object in order to call a member method.

With static methods:

public class Program
{
    public static void Main()
    {
        System.Console.WriteLine(Program.Foo());
    }

    public static string Foo()
    {
        return "Foo";
    }
}

Without static methods (in other words, requiring you to instantiate Program):

public class Program
{
    public static void Main()
    {
        System.Console.WriteLine(new Program().Foo());
    }

    public string Foo() // notice this is NOT static anymore
    {
        return "Foo";
    }
}

Main must be static because otherwise you’d have to tell the compiler how to instantiate the Program class, which may or may not be a trivial task.

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