What s a static method in C

Question

What does it mean when you add the static keyword to a method   public static void doSomething         Well  do something      Can you add the static keyword to class  What would it mean then

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When you add a  static  keyword to a method  it means that underlying implementation gives the same result for any instance of the class  Needless  to say  result varies with change in the value  of parameters

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Static variable doesn t link with object of the class  It can be accessed using classname  All object of the class will share static variable    By making function as static  It will restrict the access of that function within that file

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Static function means that it is associated with class  not a particular instance of class but the class itself  and it can be invoked even when no class instances exist   Static class means that class contains only static members

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A static function  unlike a regular  instance  function  is not associated with an instance of the class   A static class is a class which can only contain static members  and therefore cannot be instantiated   For example   class SomeClass       public int InstanceMethod     return 1        public static int StaticMethod     return 42        In order to call InstanceMethod  you need an instance of the class   SomeClass instance   new SomeClass    instance InstanceMethod        Fine instance StaticMethod          Won t compile  SomeClass InstanceMethod       Won t compile SomeClass StaticMethod         Fine

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A static method  field  property  or event is callable on a class even when no instance of the class has been created  If any instances of the class are created  they cannot be used to access the static member  Only one copy of static fields and events exists  and static methods and properties can only access static fields and static events  Static members are often used to represent data or calculations that do not change in response to object state  for instance  a math library might contain static methods for calculating sine and cosine  Static class members are declared using the static keyword before the return type of the membe

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The static keyword  when applied to a class  tells the compiler to create a single instance of that class  It is not then possible to  new  one or more instance of the class  All methods in a static class must themselves be declared static    It is possible  And often desirable  to have static methods of a non-static class  For example a factory method when creates an instance of another class is often declared static as this means that a particular instance of the class containing the factor method is not required   For a good explanation of how  when and where see MSDN

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From another point of view  Consider that you want to make some changes on a single String  for example you want to make the letters Uppercase and so on  you make another class named  Tools  for these actions  there is no meaning of making instance of  Tools  class because there is not any kind of entity available inside that class  compare to  Person  or  Teacher  class   So we use static keyword in order to use  Tools  class without making any instance of that  and when you press dot after class name   Tools   you can have access to the methods you want   using System  using System Collections Generic  using System Linq  using System Text  using System Threading Tasks   namespace ConsoleApplication1   class Program       static void Main string   args                Console WriteLine Tools ToUpperCase  Behnoud Sherafati             Console ReadKey             public static class Tools       public static string ToUpperCase string str                return str ToUpper

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Shortly you can not instantiate the static class  Ex   static class myStaticClass       public static void someFunction                     You can not make like this   myStaticClass msc   new myStaticClass        it will cause an error   You can make only   myStaticClass someFunction

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Core of the static keyword that you will have only one copy at RAM of this  method  variable  class    that s shared for all calling

[c#] What's a "static method" in C#?

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