Data Access, Properties, and Methods
- slide 28 : 29
Extension Methods
In C# 3.0 an extension method defines an instance method in an existing class without altering the definition of the class.
Class Point and a client
Motivation: A Client of Point without use of DistanceTo.
A Client of class Point which uses an extension method DistanceTo.
The static class PointExtensions.
An extension method
extends the type of the first parameter
is defined as a static method with a
this
modifier on the first parameter
must be defined in a static class
cannot access private instance variables in the extended class
is called by - behind the scene - translating to a call of the static method
Extending struct Double
