Some knowledge points for unique identifier GUIDs in C #

Concept

GUID: The globally unique Identifier (globally unique identifier) is also known as the UUID (universally unique Identifier). A GUID is a 128-bit numeric identifier produced by a particular algorithm that indicates the uniqueness of the product. GUIDs are primarily used to assign identifiers that must be unique in a network or system that has multiple nodes, multiple computers, and more than one computer.
On the Windows platform, GUIDs are widely used in Microsoft products to identify objects such as registry keys, class and interface identifiers, databases, system catalogs, and so on.

Format

The format of the GUID is "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx", where each x is a 32-bit hexadecimal number in the range of 0-9 or a-f. For example, 6F9619FF-8B86-D011-B42D-00C04FC964FF is a valid GUID value.

System.Guid.NewGuid ().        ToString ("N"); 32-bit string

Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

System.Guid.NewGuid ().        ToString ("D"); 32-bit string delimited by hyphens

Xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

System.Guid.NewGuid ().        ToString ("B"); 32-bit strings separated by hyphens in curly braces

{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}

System.Guid.NewGuid ().        ToString ("P"); 32-bit strings separated by hyphens in parentheses

(XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)

Some knowledge points for unique identifier GUIDs in C #