how to distinct date from Dictionary keys in C# code example

Example: c# distinct dictionary

var temp = _context.PlayerStats.Where(T => T.allianceId == _surf).Select(T => T.guildId).Distinct();
                var result = new Dictionary<string, string>();
                foreach (var item in temp)               
                    result[item] = _context.PlayerStats.FirstOrDefault(T => T.guildId == item).guildName;               
                return View(result);