C# serialize huge data more than 100M via splitting into batch and concatenating as one big json file

博客园 - FredGrit

WPF TreeView show WCF config file WPF itemscontrol loaded downloaded data from WCF via httpclient WPF TreeView HierarchicalDataTemplate DataTemplate, Enum get enum name WPF consume xml generated by WCF , C# deserialize xml to List WPF implemented ICommand and IDisposable WPF ContextMenu,MenuItem command can binding to datacontext's command directly WPF usercontrol pass contextmenu command via implemented Freezable class which does not attach on Visual tree, then invoked in caller MVVM WPF consume data generate by WCF and save via ContextMenu Command in MVVM C# export List<T> to excel file via EPPlus WPF ContextMenu does not rely on host visual tree, the Freezable can exist independently, convey dependency property in usercontrol to caller C# JsonConvert DeserializeObject MissingMemberHandling.Ignore when the source model is completed and the required is partial Freezable objects do not require attachment to the WPF visual tree, maintain a persistent lifetime, and serve as a reliable binding relay between a detached ContextMenu and its parent host control. C# run httplistener to act as service application asynchronously in console, semaphoreslim allow the max concurrent number WPF Microsoft.Xaml.Behaviors.WPF, EventTrigger EventName="PreviewMouseDown" the tunnel event, while the MouseDown can't trigger the command because it was swallowed WPF customize command implemented ICommand, volatile read method is thread safe, preventing cpu and comipler reorder and optimization. WPF ItemsControl load huge 50M+ data WPF consume data generated by WCF periodically in json format WPF customize command based on ICommand and manually trigger WPF consume data generated by grpc services C# produce and consume data via Google.Protobuf WCF produce message and WPF consume periodically via DispatcherTimer WCF deconstruct WebConfig includes bindings, behaviors, service, endpoint ,serviceHostingEnvironment C# insert data into SQLite in batch periodically WPF SQLite SQLiteStudio WPF customize MultiSelectComboBox based on combobox WPF DataGrid Context menu binding command and commandparameter to datacontext WCF set fixed port as http://localhost:8888/ via Project /Properties/web/project url to create virtual directory WPF customize datagrid behavior based on behavior<datagrid> with command and command parameter WPF Microsoft Visual Studio XAML designer is busy WCF WebHttpBinding support both http and https WCF support basicHttpBinding and webHttpBinding - FredGrit WCF TestClient set fixed configuration file WPF consume http json and update periodically via DispatcherTimer WPF Prism.Core version 9.0.537 implemented navigation register singleton with splash screen, pass global variable via RegisterSingleton method WPF render periodically via DispatcherTimer, customize behavior - FredGrit Python cosume WCF service via requests in json format WPF call webHttpBinding from WCF WCF binding webHttpBinding is used to web browser in json format both in request and response WPF invoke WCF dll periodically via DispatcherTimer WCF webHttpBinding is open for web browser and wpf WPF DataTemplateSelector WPF DataGrid customize behavior with multiple commands and command parameters then invoke in mvvm WPF DataGrid behavior customize command and command parameter then invoke and implemented in MVVM WPF ItemsControl customize behavior and save all items WCF service can be accessed by browser WPF WCF produce data as service and WPF consume data as client periodically WPF GRPC and Probuf generated data as service then consume by wpf periodically WPF customize behavior based on Microsoft.Xaml.Behaviors.Wpf with command and commandparameter WPF call data from CPP wrapper dll via CLI\CLR - FredGrit WPF customize behavior WPF get gpu information via System.Management WPF ItemsControl IsItemsHost=True WPF Customize behavior and dependency property command C# Serilog, Serilog.Sinks.Console, Serilog.Sinks.File C# Serilog both in file and console Windows powershell view huge file via command WPF WeakReference C# serialize datetime then deserialize, print lose precision. resolve by ToString("o") C# produce data and send via WebSocket as service, Python,Flask,HTML as consumer invoke periodically C# write generated data service and sent via websocket, then consume by python periodically C# DateTime print precision to microseconds C# WebSocket console as service provide data, another console as client,send request periodically C# WebAPI [HttpGet("{cnt}"] pass argument WPF implement ICommand with async execute WPF ListBox control virtualization in mvvm WPF Data Source invoke from web api C# WebAPI

FredGrit · 2026-03-29 · via 博客园 - FredGrit

Install-Package MessagePack
Install-Package Newtonsoft.json

using MessagePack;
using Newtonsoft.Json;
using System.CodeDom.Compiler;
using System.Collections;
using System.ComponentModel.DataAnnotations;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text;
using System.Text.RegularExpressions;
using System.Xml;
using Formatting = Newtonsoft.Json.Formatting;
using KeyAttribute = MessagePack.KeyAttribute;

namespace ConsoleApp11
{
    internal class Program
    {
        static int idx = 0;
        static void Main(string[] args)
        {
            //ReadBinFile();
            //WriteToBinFile();
            SplitByBatchSize(5, 190000000, 500000);
            //JsonDeserialize("Json_202603271009288890.json");
            Console.WriteLine($"{DateTime.Now.ToString("O")},finished");
        }

        static void JsonDeserialize(string jsonFile)
        {
            if (!File.Exists(jsonFile))
            {
                Console.WriteLine($"{DateTime.Now},json file:{jsonFile} does not exist!");
                return;
            }
            using (StreamReader reader = new StreamReader(jsonFile, Encoding.UTF8, false))
            {
                string jsonStr = reader.ReadToEnd();
                var dataList = JsonConvert.DeserializeObject<List<Book>>(jsonStr);
                if (dataList != null && dataList.Any())
                {
                    Console.WriteLine($"{DateTime.Now.ToString("O")},len:{dataList.Count}");
                }
            }
        }

        static int GetIncrementIdx()
        {
            return Interlocked.Increment(ref idx);
        }

        static void ReadBinFile(string binFile = "Bin_202603271118076128.bin")
        {
            byte[] readBytes = File.ReadAllBytes(binFile);
            List<Book> list = MessagePackSerializer.Deserialize<List<Book>>(readBytes);
            Console.WriteLine($"{DateTime.Now},len:{list.Count}");
        }

        private static void WriteToBinFile()
        {
            string binFile = $"Bin_{DateTime.Now.ToString("yyyyMMddHHmmssffff")}.bin";
            var booksList = GenerateDataList(0, 10000000);
            SaveDataListInBinary(booksList, binFile);
            Console.WriteLine($"{DateTime.Now},save in {binFile}");
        }

        private static void SaveDataListInBinary(List<Book> dataList, string binFile = "")
        {
            byte[] bytes = MessagePackSerializer.Serialize(dataList);
            File.WriteAllBytes(binFile, bytes);
        }

        private static void SplitByBatchSize(int start = 0, int end = 0, int batch_size = 0)
        {
            if (start >= end)
            {
                Console.WriteLine($"{DateTime.Now.ToString("O")},start:{start}>=end:{end}");
                return;
            }

            int batch_count = (end - start + batch_size + 1) / batch_size;
            Console.WriteLine($"{DateTime.Now.ToString("O")},start:{start},end:{end},batch size:{batch_size},batch_count:{batch_count}");

            var batch_list = Enumerable.Range(0, batch_count).ToList();
            string jsonFile = $"Json_{DateTime.Now.ToString("yyyyMMddHHmmssffff")}.json";
            foreach (var batch in batch_list)
            {
                int startIdx = start + batch * batch_size;
                int endIdx = Math.Min(start + batch * batch_size + batch_size, end);
                var booksList = GenerateDataList(startIdx, endIdx);
                if (booksList != null && booksList.Any())
                {
                    AppendDataListToJson(booksList, jsonFile, startIdx, endIdx, startIdx == start, endIdx == end, batch);
                }
            }

            Console.WriteLine($"{DateTime.Now},start:{start},end:{end},jsonFile:{jsonFile} finished");
        }

        private static void AppendDataListToJson(List<Book> booksList, string jsonFile, int startIdx, int endIdx, bool isStarted, bool isEnded, int batch)
        {
            string jsonStr = JsonConvert.SerializeObject(booksList, Formatting.Indented);
            jsonStr = jsonStr.Trim('[', ']').Trim();
            using (StreamWriter jsonWriter = new StreamWriter(jsonFile, true, System.Text.Encoding.UTF8))
            {
                if (isStarted)
                {
                    jsonWriter.Write("[\n  ");
                    jsonWriter.Write(jsonStr);
                }
                else if (isEnded)
                {
                    jsonWriter.Write(",\n  ");
                    jsonWriter.Write(jsonStr);
                    jsonWriter.Write("\n]");
                }
                else
                {
                    jsonWriter.Write(",\n  ");
                    jsonWriter.Write(jsonStr);
                }
            }
            Console.WriteLine($"{DateTime.Now},startIdx:{startIdx},endIdx:{endIdx},batch:{batch + 1}");
        }

        private static List<Book> GenerateDataList(int startIdx, int endIdx)
        {
            idx = startIdx - 1;
            List<Book> booksList = new List<Book>();
            if (startIdx >= endIdx)
            {
                Console.WriteLine($"{DateTime.Now},startIdx>=endIdx");
                return booksList;
            }

            for (int i = startIdx; i <= endIdx; i++)
            {
                var a = GetIncrementIdx();
                booksList.Add(new Book()
                {
                    Id = a,
                    Name = $"Name_{a}",
                    ISBN = $"ISBN_{a}_{Guid.NewGuid():N}",
                    Author = $"Author_{a}",
                    Abstract = $"Abstract_{a}",
                    Summary = $"Summary_{a}",
                    Title = $"Title_{a}",
                    Topic = $"Topic_{a}"
                });
            }
            return booksList;
        }
    }

    [MessagePackObject]
    class Book
    {
        [Key(0)] public int Id { get; set; }
        [Key(1)] public string Name { get; set; }
        [Key(2)] public string Author { get; set; }
        [Key(3)] public string Abstract { get; set; }
        [Key(4)] public string ISBN { get; set; }
        [Key(5)] public string Summary { get; set; }
        [Key(6)] public string Title { get; set; }
        [Key(7)] public string Topic { get; set; }
    }
}

2026-03-29T22:32:03.9580593+08:00,start:5,end:190000000,batch size:500000,batch_count:380
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2026-03-29 22:40:40,start:5,end:190000000,jsonFile:Json_202603292232039734.json finished
2026-03-29T22:40:40.4247208+08:00,finished

D:\C\ConsoleApp11\ConsoleApp11\bin\Debug\net10.0\ConsoleApp11.exe (process 11724) exited with code 0 (0x0).
To automatically close the console when debugging stops, enable Tools->Options->Debugging->Automatically close the console when debugging stops.
Press any key to close this window . . .

//Powershell
Get-Content Json_202603292232039734.json -TotalCount 30

PS D:\C\ConsoleApp11\ConsoleApp11\bin\Debug\net10.0> Get-Content Json_202603292232039734.json -TotalCount 30
[
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PS D:\C\ConsoleApp11\ConsoleApp11\bin\Debug\net10.0>

PS D:\C\ConsoleApp11\ConsoleApp11\bin\Debug\net10.0> Get-Content Json_202603292232039734.json -Tail 35

PS D:\C\ConsoleApp11\ConsoleApp11\bin\Debug\net10.0> Get-Content Json_202603292232039734.json -Tail 35
    "Summary": "Summary_189999997",
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PS D:\C\ConsoleApp11\ConsoleApp11\bin\Debug\net10.0>

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