. NET Value Type and reference type,. net reference

. NET Value Type and reference type,. net reference

 

C # Is a Type-safe development language. Its data types include Value Type and Reference Type.

1. Value Type)

• Character: char U + 0000-U + ffff 16-bit Unicode character (in fact, the character is also an integer)
• Integer: sbyte, byte, short, ushort, int, uint, long, ulong
• Float: float (7-bit valid values) and double (15-16-bit valid values)
• Decimal: 128-bit data type, which has higher precision (28-29-bit valid bits) and a smaller range than the floating point type, and is suitable for financial and currency computing.
• Boolean: bool (True or False, True or False)
• Structure: struct
• Example: enum

Summary of value types:

* ******************* Struct corresponding to the value type *************** *****

Char Char

Sbyte SByte

Byte Byte

Short Int16

Ushort UInt16

Int Int32

Uint UInt32

Long Int64

Ulong UInt64

Float Single

Double Double

Decimal Decimal

Bool Boolean

**************************************** *************

2. Reference Type (the referenced Type variable is also called an object)

• Class: class
• Interface: interface
• Delegate: delegate
• Object: built-in reference type of. NET
• String:. NET built-in reference type

Reference Type summary:

Class: Abstraction of objects with the same features

Interface: Unified constraints for seamless data sharing and communication between objects of different classes

Delegate: similar to the pointer in C ++, the method name can be passed as a parameter. The difference is that delegate is type-safe.

Object: base class of all classes in. NET

String: string (a sequence consisting of zero or multiple Unicode characters)

Iii. Comparison between value types and reference types