C# 4.0 : Add a Constructor

Define a special method, called a constructor, with the same name as the class, with no return type. A constructor runs when a type is created—it is never called directly.

Here are two constructors for the Vertex3d class—one taking arguments, the other performing some default initialization.

class Vertex3d
{
    public Vertex3d()
    {
        _x = _y = _z = 0.0;
    }

    public Vertex3d(double x, double y, double z)
    {
        this._x =x;
        this._y = y;
        this._z = z;
    }
}

Note

Constructors do not need to be public. For example, you could make a protected constructor that is only accessible from derived classes. You could even make a private constructor that prevents instantiation (for utility classes) or is accessible only from other methods in the same class (static factory methods, perhaps).