#642 – Reassigning the this Pointer in a struct

The this keyword in a struct refers to the current instance of the object represented by the struct.  

You can actually assign a new value to the this keyword, provided that the new value is an instance of the same struct.

    public struct BoxSize
    {
        public double x;
        public double y;
        public double z;

        public BoxSize(double x, double y, double z)
        {
            this.x = x;
            this.y = y;
            this.z = z;
        }

        public void CopyFrom(BoxSize newBoxSize)
        {
            // Overwrite existing BoxSize with a new one
            //   by assigning new value to this keyword
            this = newBoxSize;
        }

        public void PrintBoxSize()
        {
            Console.WriteLine(string.Format("X={0}, Y={1}, Z={2}", x, y, z));
        }
    }
        static void Main()
        {
            BoxSize myBox = new BoxSize(5, 2, 3);
            myBox.PrintBoxSize();

            myBox.CopyFrom(new BoxSize(10, 20, 30));
            myBox.PrintBoxSize();
        }

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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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