Topic T - Other Types

While the class keyword is typically used to declare new data types, there are other ways to create data types in C#.

The struct is different from the class in various ways. One of the more important to be aware of is that the data type for a struct is a value type (rather than a reference type as it is for classes). Here are some more significant differences (a more complete list can be found here):

• A struct cannot have a parameterless constructor.

• A struct can be instantiated without a new operator.

• A struct cannot inherit from classes or other structs.

• A struct cannot be null.

• struct

• interface

• delegate

• Generics

• Extension Methods