How to get SPUser Object using user id (domain_name\userid)

Question

I have the login ID of that user. But in the code I want to convert that login name into SPUser Object. Can I convert LoginName(type string) to SPUser. Or is there any way to convert windows identity user token to SPUser. I am adding users to a spgroup(so does not exist on the site). All I have is windows user token.

Thanks

Answer 1

SPUser user = SPContext.Current.Web.Users["domain\\login"];

Answer 2

Take a look at SPWeb.EnsureUser. From MSDN:

"Checks whether the specified login name belongs to a valid user of the Web site, and if the login name does not already exist, adds it to the Web site."

Used thusly:

SPUser newUser = SPContext.Current.Web.EnsureUser(@"domain\logonname");