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.NET Forum / Languages / C# / February 2008The generics IComparable<T>
Hello! I'm reading in a book from Microsoft that the generic interface IComparabler<T> define the two methods CompareTo and Equals. Now to my querstion if I look in the docs it says that CompareTo is defined in the IComparabler<T> but the Equals is not mentioned. Is this just a bad book telling me wrong thing? Or do I misunderstand it in some way? //Tony > I'm reading in a book from Microsoft that the generic interface > IComparabler<T> define the two methods [quoted text clipped - 6 lines] > Is this just a bad book telling me wrong thing? > Or do I misunderstand it in some way? Do you mean IComparer<T> or IComparable<T>? They are two different interfaces, but there's no such thing as IComparabler<T>. In either case though, there's no Equals method. That appears in IEquatable<T> and IEqualityComparer<T>. Jon The book is wrong (or is being taken out of context; hard to tell without a citation); it inherits a few methods from object (Equals(), GetHashCode(), GetType() and ToString() ) but the interface itself only declares CompareTo(). Marc Frther; there is a "bool Equals(T other)", but that is on IEquatable<T> Marc > I'm reading in a book from Microsoft that the generic interface > IComparabler<T> define the two methods [quoted text clipped - 3 lines] > in the IComparabler<T> but > the Equals is not mentioned. An early design for the .NET 2.0 class library had Equals(T) on IComparable<T>, but fortunately this was changed before release. The book may have been written against that early design. Peter  SignatureIT University of Copenhagen * sestoft@itu.dk * www.itu.dk/people/sestoft Rued Langgaards Vej 7, DK-2300 Copenhagen S, Denmark * Tel +45 72 18 50 83 Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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