C# in Depth

84 CHAPTER 3 Parameterized typing with genericsinstances of our type to play nicely when used as keys in a dictionary. Listing 3.6 givesthe complete code.Listing 3.6Generic class representing a pair of valuesusing System;using System.Collections.Generic;public sealed class Pair: IEquatable{private readonly TFirst first;private readonly TSecond second;}public Pair(TFirst first, TSecond second){this.first = first;this.second = second;}public TFirst First{get { return first; }}public TSecond Second{get { return second; }}public bool Equals(Pair other){if (other == null){return false;}return EqualityComparer.Default.Equals(this.First, other.First) &&EqualityComparer.Default.Equals(this.Second, other.Second);}public override bool Equals(object o){return Equals(o as Pair);}public override int GetHashCode(){return EqualityComparer.Default.GetHashCode(first) * 37 +EqualityComparer.Default.GetHashCode(second);}Listing 3.6 is very straightforward. The constituent values are stored in appropriatelytyped member variables, and access is provided by simple read-only properties. WeLicensed to Rhona Hadida