[C#] why when the main method is static all other methods needs to be static ?

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Hi people. I have confusion understanding why when the Main method is static all the other methods must be static too ? Could someone explain that to me ?

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Posted 28-May-17 7:33am

The_Unknown_Member

Updated 28-May-17 8:47am

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OriginalGriff · Accepted Answer · 2017-05-28T07:58:00

They aren't!

The main method must be static, because static methods do not need an instance of the class in order to be called - all non static methods require an instance of the class to be created before you can call them.
Since the main method is where your application starts, you can't create a class instance first (because the instance constructor would have to run before you could call the main method).

Once main has been called it can create instances, and call non-static methods on those instances:

static void main()
   {
   MyClass mc = new MyClass();
   ms.DoSomething();
   }

Paulo Zemek · Accepted Answer · 2017-05-28T08:47:00

They don't need to be all static. Yet, the static method doesn't have an object (the this object) while the non-static methods have it.

You can very easily do:

C#

class Program
{
  static void Main()
  {
    var program = new Program();
    program.DoSomething();
  }

  void DoSomething()
  {
    // here this will be available, and will be the program
    // variable created in the Main call. Note that you could
    // create more than one instance of the Program class.
  }
}

[C#] why when the main method is static all other methods needs to be static ?

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