How to use Guids in C#?

问题

This Code:

Something = new Guid() 

is returning:

00000000-0000-0000-0000-000000000000

all the time and I can't tell why? So, why?

回答1:

You should use Guid.NewGuid()

回答2:

Just a quick explanation for why you need to call NewGuid as opposed to using the default constructor... In .NET all structures (value types like int, decimal, Guid, DateTime, etc) must have a default parameterless constructor that initializes all of the fields to their default value. In the case of Guid, the bytes that make up the Guid are all zero. Rather than making a special case for Guid or making it a class, they use the NewGuid method to generate a new "random" Guid.

回答3:

It's in System.Guid.

To dynamically create a GUID in code:

Guid messageId = System.Guid.NewGuid();

To see its value:

string x = messageId.ToString();

回答4:

something = new Guid() equals something = Guid.Empty.

Use Guid.NewGuid(); instead

回答5:

 Guid g1 = Guid.NewGuid();

 string s1;
 s1 = g1.ToString();
 Console.WriteLine("{0}",s1);
 Console.ReadKey();

来源：https://stackoverflow.com/questions/904021/how-to-use-guids-in-c