C#: static Constructors

Static constructors are used to initialize static fields of a class. Static constructor is called only once. It is called prior to initializing any object, any static members are referenced.

Program.cs

using System;

class Circle
{
    static float PI;
    int radius;

    static Circle()
    {
        Console.WriteLine("Static constructor is called");
        PI = 3.14f;
    }

    public Circle(int radius)
    {
        Console.WriteLine("Instance constructor is called with radius {0}", radius);
        this.radius = radius;
    }

    public float getArea()
    {
        return PI * radius * radius;
    }

}

class Program
{

    static void Main(string[] args)
    {
        Circle circle1 = new Circle(5);
        Circle circle2 = new Circle(6);

        float area1 = circle1.getArea();
        float area2 = circle2.getArea();

        Console.WriteLine("area1 : {0}", area1);
        Console.WriteLine("area2 : {0}", area2);
    }

}

Output

Static constructor is called
Instance constructor is called with radius 5
Instance constructor is called with radius 6
area1 : 78.5
area2 : 113.04

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