用linq 执行动态sql

//字段名  表名都是动态传入的  

protected static bool IsDuplicate(HRPaidTimeOffDataContext db, string tableName, string fieldName, string fieldNameId, DateTime value, int id)
       {
           string sql = "select count("+fieldNameId+") as DuplicateCount from "+tableName
               +" where "+fieldName+"={0} and "+fieldNameId+"<>{1}";

           var result= db.ExecuteQuery<DuplicateCheck>(sql, new object[] { value, id }).ToList();
           List<DuplicateCheck> list = result.ToList();
           return list[0].DuplicateCount > 0;
        
       }