Jsontextwriter Example in C#, VB.NET

By: Suresh Dasari Jan 30, 2017

Introduction:

Here we will learn how to use jsontextwriter in c#, vb.net with example or how to write json using jsontextwriter in c#, vb.net with example or newtonsoft jsontextwriter to write json with example in c#, vb.net or convert list to json using newtonsoft jsontextwriter in c#, vb.net with example. By using newtonsoft reference in our applications we can easily convert list to json format and serialize / de-serialize list objects easily based on our requirements.

Description:

In previous articles I explained send / receive JSON objects from web service with example, angularjs filter json object to show / hide elements based on conditions, Show info window on google maps when click on markers, show markers on google maps using json data, convert json string to json object with example and many more articles related to in JSON, asp.net, mvc, c#, vb.net. Now I will explain how to use newtonsoft jsontextwriter to create json file with required data in c#, vb.net with example.

Generally in our applications jsontextwriter is used to convert the list items to json in required format and it will help us to show list items as a separate json items based on our requirements.

Following is the simple code snippet to convert list items to json format using jsontextwriter.

C# Code

using System;

using System.Collections.Generic;

using System.Text;

using Newtonsoft.Json;

using System.IO;

namespace testtopics

{

class Program

{

static void Main(string[] args)

{

List<userdetails> items = new List<userdetails>();

userdetails user = new userdetails();

items.Add(new userdetails { userid = 1, username = "suresh", location = "chennai" });

items.Add(new userdetails { userid = 2, username = "rohini", location = "guntur" });

items.Add(new userdetails { userid = 3, username = "praveen", location = "bangalore" });

items.Add(new userdetails { userid = 4, username = "sateesh", location = "vizag" });

items.Add(new userdetails { userid = 5, username = "madhav", location = "nagpur" });

items.Add(new userdetails { userid = 6, username = "honey", location = "nagpur" });

StringBuilder sb = new StringBuilder();

StringWriter sw = new StringWriter(sb);

using(JsonTextWriter jw = new JsonTextWriter(sw))

{

// jw.Formatting = Formatting.Indented;

foreach(var item in items)

{

jw.WriteStartObject();

var userinfo = new userdetails

{

userid = item.userid,

username = item.username,

location = item.location

};

var proptypes = userinfo.GetType();

jw.WritePropertyName("userid");

jw.WriteValue(userinfo.userid.ToString());

jw.WritePropertyName("username");

jw.WriteValue(userinfo.username.ToString());

jw.WritePropertyName("location");

jw.WriteValue(userinfo.location.ToString());

jw.WriteEndObject();

jw.WriteRaw("\n");

}

Console.WriteLine(sb.ToString());

Console.ReadLine();

}

class userdetails

{

public int userid { get; set; }

public string username { get; set; }

public string location { get; set; }

}

VB.NET Code

Imports System.Collections.Generic

Imports System.Text

Imports Newtonsoft.Json

Imports System.IO

Module Module1

Sub Main()

Dim items As New List(Of userdetails)()

Dim user As New userdetails()