Equality in C#

Reference types, Value types, and Patterns - slide 6 : 29

Equality in C#

There are several equality operations in C# on reference types

o1.Equals(o2) - equality
- By default, true if o1 and o2 are created by execution of the same new
- Can be redefined in a particular class
Object.ReferenceEquals(o1, o2) - identity
- True if both o1 and o2 are null, or if they are created by execution of the same new
- Static - cannot be redefined.
Object.Equals(o1, o2)
- True if Object.ReferenceEquals(o1, o2), or if o1.Equals(o2)
o1 == o2
- True if both o1 and o2 are null, or if they are created by execution of the same new
- An overloadable operator

Equality of value types and reference types