C＃ System. Guid. Newguid() format

Concept

GUID： namely Globally Unique Identifier（ Globally unique identifier ） Also known as UUID(Universally Unique IDentifier) . GUID Is a binary generated by a specific algorithm with a length of 128 The numeric identifier of the bit , Used to indicate the uniqueness of the product .GUID Mainly used for having multiple nodes 、 In a network or system of multiple computers , Assignment must have a unique identifier .
stay Windows On the platform ,GUID Widely used in Microsoft products , Used to identify registry entries 、 Class and interface identification 、 database 、 System directory and other objects .

Format

GUID The format is “xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx”, Each of them x yes 0-9 or a-f One of the ranges 32 A hexadecimal number . for example ：6F9619FF-8B86-D011-B42D-00C04FC964FF Is valid GUID value .

System.Guid.NewGuid().ToString(“N”); 32 A string

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
38bddf48f43c48588e0d78761eaa1ce6

System.Guid.NewGuid().ToString(“D”); Hyphenated 32 A string

xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
57d99d89-caab-482a-a0e9-a0a803eed3ba

System.Guid.NewGuid().ToString(“B”); In braces 、 Hyphenated 32 A string

{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
{09f140d5-af72-44ba-a763-c861304b46f8}

System.Guid.NewGuid().ToString(“P”); In parentheses 、 Hyphenated 32 A string

(xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)
(778406c2-efff-4262-ab03-70a77d09c2b5)