public sealed class ProductSerialNumber { public ProductSerialNumber( string productSeries, int model, long id) { ProductSeries = productSeries; Model = model; Id = id; } public readonly string ProductSeries; public readonly int Model; public readonly long Id; public override int GetHashCode() { int hashCode = ProductSeries.GetHashCode(); hashCode ^= Model; // Xor (eXclusive OR) hashCode ^= Id.GetHashCode(); // Xor (eXclusive OR) return hashCode; } public override bool Equals(object obj) { if (obj == null) { return false; } if (ReferenceEquals(this, obj)) { return true; } if (this.GetType() != obj.GetType()) { return false; } return Equals((ProductSerialNumber)obj); } public bool Equals(ProductSerialNumber obj) { // STEP 3: Possibly check for equivalent hash codes // if (this.GetHashCode() != obj.GetHashCode()) // { // return false; // } // STEP 4: Check base.Equals if base overrides Equals() // System.Diagnostics.Debug.Assert( // base.GetType() != typeof(object)); // if ( base.Equals(obj) ) // { // return false; // } // STEP 1: Check for null return ((obj != null) // STEP 5: Compare identifying fields for equality. && (ProductSeries == obj.ProductSeries) && (Model == obj.Model) && (Id == obj.Id)); } public static bool operator ==( ProductSerialNumber leftHandSide, ProductSerialNumber rightHandSide) { // Check if leftHandSide is null. // (operator== would be recursive) if (ReferenceEquals(leftHandSide, null)) { // Return true if rightHandSide is also null // but false otherwise. return ReferenceEquals(rightHandSide, null); } return (leftHandSide.Equals(rightHandSide)); } public static bool operator !=( ProductSerialNumber leftHandSide, ProductSerialNumber rightHandSide) { return !(leftHandSide == rightHandSide); } }
