#1,052 – Boxing Is a Kind of Implicit Conversion

Boxing is the process of copying a value-typed object to a new instance of a reference-typed object.  Boxing operations are classified as implicit conversions, in that you are converting between types in a way that is guaranteed to succeed and does not require a cast operator.

Below are some examples of boxing operations.

        public interface IDistance
        {
            double CalcDistance();
        }

        public struct Point3D : IDistance
        {
            public double X, Y, Z;

            public double CalcDistance()
            {
                return Math.Sqrt(X*X + Y*Y + Z*Z);
            }
        }

        public enum Mood { Crabby, NotSoCrabby };

        static void Main(string[] args)
        {
            // Three kinds of value-typed objects
            Point3D pt;
            pt.X = 1.0;
            pt.Y = 2.0;
            pt.Z = 3.0;

            int i1 = 12;
            int? i2 = null;

            // Convert to object
            object o = pt;
            o = i1;
            o = i2;

            // Convert to dynamic
            dynamic dyn1 = pt;
            dyn1 = i1;
            dyn1 = i2;

            // Convert to System.ValueType
            ValueType vty = pt;
            vty = i1;
            vty = i2;

            // Convert to interface implemented
            // by the value type
            IDistance idist = pt;
            double dist = idist.CalcDistance();

            // From enum value to System.Enum
            Mood myMood = Mood.NotSoCrabby;
            Enum genEnum = myMood;
        }
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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.

One Response to #1,052 – Boxing Is a Kind of Implicit Conversion

  1. Pingback: Dew Drop – March 13, 2014 (#1742) | Morning Dew

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