Data Types in C#

C# Data TypesValue types

Pre-defined:

int, uint, float, etc.

User-defined:

Structures and Enumerations

Reference types

Pre-defined:

ObjectsStrings

User-defined:

ClassesArraysDelegatesInterfaces

Everything inherits from System.Object

C# Value vs. ReferenceValue Types directly contain the variable data.Example: int, float, enum, struct...Reference Types contain a reference to the datamyObjectReference TypeValue TypeReference TypemyObjectReference TypemyObjectReference TypemyObjectReference TypemyObjectReference Type

Memoryint xint y

Memoryref0

ref1

Memoryref0

ref1

Memoryref0

ref1

Memoryref0

ref1

Memoryref0

ref1

Memoryref0

ref1

Memoryref0

ref1

class ValueTypeValueType is a class that inherits directly from objectYou cannot inherit from ValueTypeValueType overrides System.Object methods so they make sense

Value typevalue-types inherit directly from ValueTypeBuilt in types(bool,int,etc)enum typesstruct typesAll value-types are sealedvalue-types cannot be nullAssignment of a value-type results in a copy of the variable

value-type Hierarchyvalue-typestruct-typeenum-typetype-namesimple-typenumeric-typebooltype-namefloating-point-typeintegral-typedecimal

Reference TypesClassesobject (System.Object)stringuser-defined classesInterfacesArraysDelegatesdelegate (System.Delegate)

Reference-type Hierarchyreference-typearray-typeinterface-typeclass-typetype-nameobjectdelegate-typestring