public IEnumerable FilterUsers()

in src/Graph.Rbac/Version1_6/ActiveDirectory/ActiveDirectoryClient.cs [198:259]
58 lines of code
11 McCabe index (conditional complexity)

        public IEnumerable<PSADUser> FilterUsers(ADObjectFilterOptions options, ulong first = ulong.MaxValue, ulong skip = 0)
        {
            if (!string.IsNullOrEmpty(options.Id))
            {
                User user = null;
                try
                {
                    user = GraphClient.Users.Get(Normalize(options.Id));
                }
                catch {  /* The user does not exist, ignore the exception. */ }

                if (user != null)
                {
                    return new List<PSADUser> { user.ToPSADUser() };
                }
            }
            else if (!string.IsNullOrEmpty(options.UPN) || !string.IsNullOrEmpty(options.Mail))
            {
                IPage<User> result = null;
                try
                {
                    string upnOrMail = Normalize(options.UPN) ?? Normalize(options.Mail);
                    var odataQuery = new Rest.Azure.OData.ODataQuery<User>();
                    if (!string.IsNullOrEmpty(options.UPN))
                    {
                        odataQuery.SetFilter(u => u.UserPrincipalName == upnOrMail);
                    }
                    else
                    {
                        odataQuery.SetFilter(u => u.Mail == upnOrMail);
                    }
                    result = GraphClient.Users.List(odataQuery);
                }
                catch {  /* The user does not exist, ignore the exception. */ }

                if (result != null)
                {
                    return result.Select(u => u.ToPSADUser());
                }
            }
            else
            {
                Rest.Azure.OData.ODataQuery<User> odataQuery = null;
                if (!string.IsNullOrEmpty(options.SearchString) && options.SearchString.EndsWith("*"))
                {
                    options.SearchString = options.SearchString.TrimEnd('*');
                    odataQuery = new Rest.Azure.OData.ODataQuery<User>(u => u.DisplayName.StartsWith(options.SearchString));
                }
                else
                {
                    odataQuery = new Rest.Azure.OData.ODataQuery<User>(u => u.DisplayName == options.SearchString);
                }

                return new GenericPageEnumerable<User>(
                    delegate ()
                    {
                        return GraphClient.Users.List(odataQuery.ToString());
                    }, GraphClient.Users.ListNext, first, skip).Select(u => u.ToPSADUser());
            }

            return new List<PSADUser>();
        }