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Jsontextwriter Example in C#, VB.NET

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()
items.Add(New userdetails() With {
.userid = 1,
.username = "suresh",
.location = "chennai"
})
items.Add(New userdetails() With {
.userid = 2,
.username = "rohini",
.location = "guntur"
})
items.Add(New userdetails() With {
.userid = 3,
.username = "praveen",
.location = "bangalore"
})
items.Add(New userdetails() With {
.userid = 4,
.username = "sateesh",
.location = "vizag"
})
items.Add(New userdetails() With {
.userid = 5,
.username = "madhav",
.location = "nagpur"
})
items.Add(New userdetails() With {
.userid = 6,
.username = "honey",
.location = "nagpur"
})
Dim sb As New StringBuilder()
Dim sw As New StringWriter(sb)
Using jw As New JsonTextWriter(sw)
'jw.Formatting = Formatting.Indented
For Each item In items
jw.WriteStartObject()
Dim userinfo = New userdetails() With {
.userid = item.userid,
.username = item.username,
.location = item.location
}
Dim 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(vbLf)
Next
End Using

Console.WriteLine(sb.ToString())
Console.ReadLine()
End Sub

Class userdetails
Public Property userid() As Integer
Get
Return m_userid
End Get
Set
m_userid = Value
End Set
End Property
Private m_userid As Integer
Public Property username() As String
Get
Return m_username
End Get
Set
m_username = Value
End Set
End Property
Private m_username As String
Public Property location() As String
Get
Return m_location
End Get
Set
m_location = Value
End Set
End Property
Private m_location As String
End Class

End Module

If you observe above code we added namespace “Newtonsoft.JSON” this we can get by adding reference using Manage Nuget Packages. To add reference right click on References in your application à select Manage Nuget Packages à Go to Browse Tab à Search for Newtonsoft à From the list select Newtonsoft.Json and install it. Once we install the component that will show like as shown following.

Demo

When we run above code we will get result like as shown below

This is how we can use jsontextwriter to rewrite json in required format.

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