simple constructor using this

Question

I'm examing some code and I'm found this bellow snippet of code and I just want to be sure for my understandnig of this second constructor. So, please confirm me is this right understanding of :this()

When User is created with this second constructor it will always inherit assigned Roles property, since Roles property is not assigned anywhere inside second constructor I assume it's left to be used somewhere later in the code.

protected User()
{
    Roles = new HashedSet<Role>();
}

public User(string username, string email, string password, string hashAlgorithm)
   : this()
{
    UserName = username;
    Email = email;
    SetPassword(password, hashAlgorithm);
    IsApproved = true;
 }

score 5 · Accepted Answer · answered Dec 30 '12 at 21:07

5

The "this()" simply invokes the first contructor. See the last two code snippets in the following MSDN topic:

http://msdn.microsoft.com/en-us/library/ms173115.aspx

answered Dec 30 '12 at 21:07

user1610015

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Kim Hansson · Answer 2 · 2012-12-30T21:32:38.767

2

The syntax : this() will call a constructor that take no arguments, in this case the first constructor in your example. This makes sure that Roles is intitialized in the same manner when calling either constructor.

edited Dec 30 '12 at 21:32

answered Dec 30 '12 at 21:08

Kim Hansson

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score 0 · Answer 3 · edited May 23 '17 at 12:12

0

Your understanding is correct except that Roles is not inherited and simply other property of the User class.

this() MSDN

When do you use this keyword

edited May 23 '17 at 12:12

Community

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answered Dec 30 '12 at 21:05

Tilak

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There isn't (and doesn't have to be) a base class. Your answer doesn't answer the original question. – adrianbanks Dec 30 '12 at 21:11
My bad, i glanced it as base. Deleting my answer. – Tilak Dec 30 '12 at 21:13

simple constructor using this

3 Answers3