Csharp/CSharp Tutorial/Class/static method

Static Member Functions

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());
    }
}

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.

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()); 
  } 
}

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