CODEWITHSUNDEEP
c#guid
5YrsLaterDBA
5YrsLaterDBA

Reputation: 34820

C# how to create a Guid value?

One field of our struct is Guid type. How to generate a valid value for it?

Upvotes: 640

Views: 617239

Answers (13)

Alireza
Alireza

Reputation: 104900

Using '

Guid guid = Guid.NewGuid();

You need:

using System;

Which mainly used in any C# code.

If any issue, make sure Guid is not overwritten.

Upvotes: 4

solarmoon12
solarmoon12

Reputation: 84

If you are using the ABP framework, it is recommended to use IGuidGenerator.Create() instead of Guid.NewGuid(). This is to ensure GUIDs are sequential, improving read/write times on the database. https://docs.abp.io/en/abp/latest/Guid-Generation#iguidgenerator

Upvotes: 0

Sameer
Sameer

Reputation: 383

It's really easy. The .Net framework provides an in-built function to create and parse GUIDS. This is available in the System namespace and the static Guid class.

To create a GUID just use the code below:

var newGuid = System.Guid.NewGuid();

To parse a GUID string as a GUID, use the code below:

var parsedGuid = System.Guid.Parse(guidString);

If you just want to create a new guide and just use it in your application, just use one of the online GUID Generator tools online to create yourself a new guid.

Upvotes: 1

Joel Wiklund
Joel Wiklund

Reputation: 1875

There's also ShortGuid - A shorter and url friendly GUID class in C#. It's available as a Nuget. More information here.

PM> Install-Package CSharpVitamins.ShortGuid

Usage:

Guid guid = Guid.NewGuid();
ShortGuid sguid1 = guid; // implicitly cast the guid as a shortguid
Console.WriteLine(sguid1);
Console.WriteLine(sguid1.Guid);

This produces a new guid, uses that guid to create a ShortGuid, and displays the two equivalent values in the console. Results would be something along the lines of:

ShortGuid: FEx1sZbSD0ugmgMAF_RGHw 
Guid:      b1754c14-d296-4b0f-a09a-030017f4461f

Upvotes: 7

SaliaMun
SaliaMun

Reputation: 79

If you are using this in the Reflection C#, you can get the guid from the property attribute as follows

var propertyAttributes= property.GetCustomAttributes();
foreach(var attribute in propertyAttributes)
{
  var myguid= Guid.Parse(attribute.Id.ToString());
}

Upvotes: 1

Adam Driscoll
Adam Driscoll

Reputation: 9483

Guid.NewGuid() creates a new random guid.

Upvotes: 108

reza.cse08
reza.cse08

Reputation: 6178

To makes an "empty" all-0 guid like 00000000-0000-0000-0000-000000000000.

var makeAllZeroGuID = new System.Guid();

or

var makeAllZeroGuID = System.Guid.Empty;

To makes an actual guid with a unique value, what you probably want. 

var uniqueGuID = System.Guid.NewGuid();

Upvotes: 38

Justin
Justin

Reputation: 4072

There are two ways

var guid = Guid.NewGuid();

or 

var guid = Guid.NewGuid().ToString();

both use the Guid class, the first creates a Guid Object, the second a Guid string.

Upvotes: 112

Zeliax
Zeliax

Reputation: 5386

If you want to create a "desired" Guid you can do 

var tempGuid = Guid.Parse("<guidValue>");

where <guidValue> would be something like 1A3B944E-3632-467B-A53A-206305310BAE.

Upvotes: 33

user1228
user1228

Reputation: 

var guid = new Guid();

Hey, its a 'valid', although not very useful, Guid.

(the guid is all zeros, if you don't know. Sometimes this is needed to indicate no guid, in cases where you don't want to use a nullable Guid)

Upvotes: 36

siphab
siphab

Reputation: 451

System.Guid desiredGuid = System.Guid.NewGuid();

Upvotes: 22

TWA
TWA

Reputation: 12826

Guid.NewGuid() will create one

Upvotes: 61

David
David

Reputation: 12916

Guid id = Guid.NewGuid();

Upvotes: 1143

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