The IEquatableT Interface

The IEquatable<T> Interface

C# 2.0 adds the new interface IEquatable<T>, which is implemented by those classes that need to define how two objects should be compared for equality. It defines only one method, Equals( ), which is shown here:

 bool Equals(T obj)

The method returns true if obj is equal to the invoking object and false otherwise.

IEquatable<T> has been retrofitted to several classes and structures in the .NET Framework, including the numeric structures and the Char, Int32, Boolean, and String classes.