static method in c#

Question

static method only contain static data member which is absolutely right. Then Why static method Main() contain non static data member and member function.

Vulpes · Answer

It's true that this static method doesn't compile but for different reasons to the ones you've given: public static void abc() { static int i=1; // not OK because can't declare static members within a method. int j=10; // OK because it's a local variable declaration } I suspect there may be a confusion in your mind between fields (i.e. class level variables which are either static or instance) and local variables. Any method whether it's static or instance can contain local variable declarations which only exist (at most) until the method returns. Similarly this won't compile either for the reasons noted: public static void Main(String [] args) { int i=10; // correct local variable declaration static int j=10;// not correct because can't declare static members within a method }

Sharad Gupta · Answer

Hi Vulples acutally i was asking to you if any user defines it own static method. e.g; user define static method public static void abc() { static int i=1; //correct int j=10;//incorrect because it is not static member } and if i wrote public static void Main(String [] args) { int i=10; //correct static int j=10;//correct } So i am asking to you the user defined abc static method only contain static data member. if you are initilizing non static data member in it. it will generate a error. and in Main() it contains both staic and non static data members why?

Vulpes · Answer

A static method isn't necessarily limited to accessing static data - it can also access instance data if it has an object reference for that data. For example: using System; class Test { static string hello = Hello; string goodbye = Goodbye; // instance data static void Main() { Console.WriteLine(hello); Test t = new Test(); Console.WriteLine(t.goodbye); // need object reference to access instance data Console.ReadKey(); } }