Create New SharePoint Group Programmatically

Question

How can I create a new SharePoint group by code?

Answer 1

From http://www.codekeep.net/snippets/0301b30a-cdf9-4dd2-bbd0-0be4ad6c1a90.aspx :

using (SPWeb topSite = (SPWeb)properties.Feature.Parent)
{
    SPGroup grouppi = null;
    SPMember oMember;
    string[] protectedDocumentReaders = ConfigurationManager.AppSettings["$appSetting$"].ToString().Split(new char[] { ';' });
    try
    {
       oMember = topSite.Users[topSite.Author.LoginName];                                        
       grouppi = root.SiteGroups["$listname$"];
    }
    catch { }

    if (grouppi == null)
    {
        root.SiteGroups.Add("$gname$", oMember, root.Author, "My New Group Description");
        grouppi = root.SiteGroups["$gname$"];

        SPRoleDefinition oRole = root.RoleDefinitions.GetByType(SPRoleType.Contributor);
        SPRoleAssignment oRoleAssignment = new SPRoleAssignment(grouppi);
        oRoleAssignment.RoleDefinitionBindings.Add(oRole);
        root.RoleAssignments.Add(oRoleAssignment);
        root.Update();

        foreach (string user in protectedDocumentAdmins)
        {
            grouppi.Users.Add(user, "", user, "");
        }
    }
}

Answer 2

Creating the group is simple just call SPGroupCollection.Add

using (SPWeb oWebsiteRoot = SPContext.Current.Site.RootWeb)
{
    SPGroupCollection collGroups = oWebsiteRoot.SiteGroups;
    SPUser oUser = oWebsiteRoot.Users["User_Name"];
    SPMember oMember = oWebsiteRoot.Users["User_Name"];

    collGroups.Add("Group_Name", oMember, oUser, "Description");
}

Then you need may need to add users/groups and permissions depending on your needs