How to check if a user exists in a group

Question

How can i check if a user (not the current user) exists in a group. The SPGroup object allows to check if the current user is member of the group, but there is no method that checks if a SPUser given in parameter exists or not.

Someone has any idea ?

Answer 1

I use an extension method, like this:

    public static bool InGroup(this SPUser User, string GroupName)
    {
        return User.Groups.Cast<SPGroup>().Any(g => g.Name.ToLower() == GroupName.ToLower());
    }

Then call it like this:

bool inGroup = spuser.InGroup("GroupName");

Answer 2

I think you have to look at the SPUser instead of the SPGroup: SPUser has a Groups collection you can iterate and look for the group name.

Something like:

foreach ( SPGroup group in user.Groups )
    if ( group.Name == groupName )
        // found it

Answer 3

you could try SPGroup.ContainsCurrentUser, after having opened your SPSite with the SPUserToken of your target user.

Answer 4

The SPGroup has a Users property which is a SPUser collection. Why not just loop through that and look for the SPUser that way?

Answer 5

For a client-side JavaScript solution, this article describes how to determine if a not-current-user is a member of a group. http://chrissyblanco.blogspot.com/2007/07/determining-whether-user-is-member-of.html