Csharp/CSharp Tutorial/Class/static method

Static Member Functions

<source lang="csharp">using System; class MyClass {

   public MyClass()
   {
       instanceCount++;
   }
   public static int GetInstanceCount()
   {
       return(instanceCount);
   }
   static int instanceCount = 0;

} class MainClass {

   public static void Main()
   {
       MyClass my = new MyClass();
       Console.WriteLine(MyClass.GetInstanceCount());
   }

}</source>

1

Use static

There are several restrictions that apply to static methods:

1. A static method does not have a this reference.
2. A static method can directly call only other static methods.
3. A static method cannot directly call an instance method of its class.
4. A static method must directly access only static data.
5. You can"t directly access a non-static variable from within a static method.
6. You can"t directly call a non-static method from within a static method.

<source lang="csharp">using System;

class StaticDemo {

 // a static variable 
 public static int val = 100;  

 // a static method 
 public static int valDiv2() { 
   return val/2; 
 } 

}

class MainClass {

 public static void Main() { 

   Console.WriteLine("Initial value of StaticDemo.val is " 
                     + StaticDemo.val); 

   StaticDemo.val = 8; 
   Console.WriteLine("StaticDemo.val is " + StaticDemo.val); 
   Console.WriteLine("StaticDemo.valDiv2(): " + 
                      StaticDemo.valDiv2()); 
 } 

}</source>

Initial value of StaticDemo.val is 100
StaticDemo.val is 8
StaticDemo.valDiv2(): 4