When you are implementing value equality in a type, you typically override the Equals method that is defined inSystem.Object. It has the following signature:
1
| public override bool Equals(object obj) |
You should also add a type-specific Equals method. For completeness, you can indicate that your class implementsIEquatable<T>, which includes the type-specific Equals method.
1
| public class Dog : IEquatable<Dog> |
Below is a complete example, showing us the override of System.Object.Equals, as well as the type-specific Equalsmethod. Note that the generic Equals method calls the type-specific version.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
| // System.Object.Equalspublic override bool Equals(object obj){ return this.Equals(obj as Dog);}// IEquatable<Dog>.Equalspublic bool Equals(Dog d){ if (d == null) return false; return (Name == d.Name) && (Age == d.Age);} |