using ConsoleApp390.Model; using Newtonsoft.Json; using System; using System.Collections.Generic; using System.Diagnostics; using System.IO; using System.Linq; using System.Runtime.Serialization; using System.Runtime.Serialization.Formatters.Binary; using System.Text; using System.Threading; using System.Threading.Tasks; namespace ConsoleApp390 { class Program { static void Main(string[] args) { SerializationDemo(); } static void SerializationDemo() { List<SalesOrderDetail> dataList = GetList(); bool IsBusy = false; for(int i=0;i<10;i++) { if(!IsBusy) { IsBusy = true; Task task = Task.Run(() => { TestCostDemo(dataList); }); task.Wait(); Console.WriteLine($"Task {i} has finished!"); IsBusy = false; } } } static void TestCostDemo(List<SalesOrderDetail> dataList) { StringBuilder msgBuilder = new StringBuilder(); Stopwatch sw = new Stopwatch(); sw.Start(); Console.WriteLine($"BinaryFormatterDemo started at {DateTime.Now.ToString("yyyyMMddHHmmssffff")}"); BinaryFormatterDemo<SalesOrderDetail>(dataList); sw.Stop(); Console.WriteLine($"BinaryFormatterDemo stopped at {DateTime.Now.ToString("yyyyMMddHHmmssffff")}"); msgBuilder.Append($"In .net 4.8,now {DateTime.Now.ToString("yyyyMMddHHmmssffff")} BinaryFormatterDemo cost {sw.ElapsedMilliseconds} milliseconds."); sw.Restart(); Console.WriteLine($"NewtonJsonDemo started at {DateTime.Now.ToString("yyyyMMddHHmmssffff")}"); NewtonJsonDemo<SalesOrderDetail>(dataList); sw.Stop(); Console.WriteLine($"NewtonJsonDemo stopped at {DateTime.Now.ToString("yyyyMMddHHmmssffff")}"); msgBuilder.Append($"NewtonJsonDemo cost {sw.ElapsedMilliseconds} milliseconds."); sw.Restart(); Console.WriteLine($"JsonSerializerDemo started at {DateTime.Now.ToString("yyyyMMddHHmmssffff")}"); JsonSerializerDemo<SalesOrderDetail>(dataList); sw.Stop(); Console.WriteLine($"JsonSerializerDemo stopped at {DateTime.Now.ToString("yyyyMMddHHmmssffff")}"); msgBuilder.AppendLine($"JsonSerializerDemo cost {sw.ElapsedMilliseconds} milliseconds.\n\n"); string msg = msgBuilder.ToString(); PrintMsg(msg); } private static void PrintMsg(string msg) { Console.WriteLine(msg); Debug.WriteLine(msg); LogResult(msg); } static List<SalesOrderDetail> GetList() { using (AdventureWorks2017Entities db = new AdventureWorks2017Entities()) { List<SalesOrderDetail> dataList = new List<SalesOrderDetail>(db.SalesOrderDetails); return dataList; } } static void BinaryFormatterDemo<T>(List<T> dataList) { using (FileStream fs = new FileStream($"{Guid.NewGuid().ToString().Substring(0, 6)}BinFormatter.dat", FileMode.Create)) { BinaryFormatter binFormatter = new BinaryFormatter(); try { binFormatter.Serialize(fs, dataList); } catch (SerializationException e) { Console.WriteLine($"BinaryFormatter serialize ex:{e.StackTrace}"); } } } static void NewtonJsonDemo<T>(List<T> dataList) { try { string jsonString = JsonConvert.SerializeObject(dataList); } catch (SerializationException ex) { Console.WriteLine($"NewtonJson serialization ex :{ex.StackTrace}"); } } static void JsonSerializerDemo<T>(List<T> dataList) { try { string msJsonSerializerString = System.Text.Json.JsonSerializer.Serialize(dataList); } catch (SerializationException ex) { Console.WriteLine($"System.Text.Json.JsonSerializer ex:{ex.StackTrace}"); } } static void LogResult(string msg) { string logPath = @"log.txt"; using (StreamWriter logWriter = new StreamWriter(logPath, true, Encoding.UTF8)) { logWriter.WriteLine(msg); } } } }

I had validated in .net 4.8 NewtonSoft.Json‘s speed rank 1st,System.Text.Json.JsonSerializer.Serialize 2nd,and BinaryFormatter 3rd.