C# list 去重

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 /// <summary>        /// 汽車商標 擷取        /// 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", 6379);//redis服務IP和連接埠             int jsCode = 1;            string jsMessage = "一切正常";            List<TrademarkC> IList_TrademarkC = null;            try            {                IList_TrademarkC = redisClient.Get<List<TrademarkC>>("zgqp315_Redis_TrademarkC_List");                //根據 欄位 FirstLetter 進行去重複 開始                 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();                //根據 欄位 FirstLetter 進行去重複 結束             }            catch (Exception ex)            {                jsCode = 0;                jsMessage = ex.Message;            }                 return new RedisJsonResult()            {                JsCode = jsCode,                JsMessage = jsMessage,                data_TrademarkC = IList_TrademarkC,                success = true,            };        }

 

C# list 去重