C# list 去重

 /// <summary>

        /// 汽车商标 获取

        /// Redis Key=zgqp315_Redis_TrademarkC_List

        /// </summary>

        /// <returns></returns>

        public static RedisJsonResult Get_TrademarkC()

        {

            //var redisClient = RedisManager.GetClient();

            var redisClient = new RedisClient("127.0.0.1", );//redis服务IP和端口

            int jsCode = ;

            string jsMessage = "一切正常";

            List<TrademarkC> IList_TrademarkC = null;

            try

            {

                IList_TrademarkC = redisClient.Get<List<TrademarkC>>("zgqp315_Redis_TrademarkC_List");

                //根据 字段 FirstLetter 进行去重复 开始

                var list_TrademarkC = IList_TrademarkC.GroupBy(m => m.FirstLetter.ToLower().Trim()).Select(m => new

                {

                    TrademarkId = m.FirstOrDefault().TrademarkId

                });

                IList_TrademarkC = IList_TrademarkC.Where(m => list_TrademarkC.Select(mo => mo.TrademarkId).Contains(m.TrademarkId)).ToList();

                //根据 字段 FirstLetter 进行去重复 结束

            }

            catch (Exception ex)

            {

                jsCode = ;

                jsMessage = ex.Message;

            }

            return new RedisJsonResult()

            {

                JsCode = jsCode,

                JsMessage = jsMessage,

                data_TrademarkC = IList_TrademarkC,

                success = true,

            };

        }