SharePoint Get Emails for Users Associated to SPListItem

Challenge

On a recent project, I needed a way to build a list of emails for a given SPListItem. Considering most of you just want the code, here it is:

Solution

public List GetEmailsForUsersAssociated(SPListItem item)
        {
            //list for emails
            List emails = new List();

            //omitted for brevity...

            SPSecurity.RunWithElevatedPrivileges(delegate()
            {
                try
                {
                    using (SPSite ospSite = new SPSite(siteUrl))
                    {
                        using (SPWeb currentWeb = ospSite.OpenWeb())
                        {
                            SPListItem p_Item = currentWeb.GetListItem(dataSiteName + "/" + itemUrl);

                            SPRoleAssignmentCollection usersOrGroups = p_Item.RoleAssignments;
                            foreach (SPRoleAssignment userOrGroup in usersOrGroups)
                            {
                                if (userOrGroup.Member.GetType().ToString() == "Microsoft.SharePoint.SPUser")
                                {
                                    //Get user and add to email list
                                    SPUser user = (SPUser)userOrGroup.Member;
                                    if (!String.IsNullOrEmpty(user.Email))
                                        if (!emails.Contains(user.Email))
                                            emails.Add(user.Email);
                                }
                                else if (userOrGroup.Member.GetType().ToString() == "Microsoft.SharePoint.SPGroup")
                                {
                                    String groupName = userOrGroup.Member.ToString();
                                    SPGroup group = currentWeb.SiteGroups[groupName];
                                    SPUserCollection users = group.Users;

                                    foreach (SPUser user in users)
                                    {
                                        if (!String.IsNullOrEmpty(user.Email))
                                            if (!emails.Contains(user.Email))
                                                emails.Add(user.Email);
                                    }
                                }
                            }
                        }
                    }
                }
                catch (Exception e)
                {
                    throw e;
                }
            });

            return emails;

Additionally, if you would like to remove duplicate emails, you can do so with some quick LINQ:

string bcc = emails.Distinct().ToList().Aggregate((First, Second) => First + ";" + Second);

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