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Convert List Object to JSON String in C#, VB.NET

Feb 2, 2017
Introduction:

Here we will learn how to convert list object to JSON string in asp.net using c#, vb.net with example or how to convert JSON string to generic list in c#, vb.net with example or convert list of objects to JSON string in asp.net using c#, vb.net with example. By using newtonsoft.json reference in our asp.net applications we can easily convert list object to JSON string or JSON string to list object based on our requirements.

Description:


In previous articles I explained jQuery scrollable gridview with fixed header example, jQuery countdown timer example, jQuery redirect to another page after 5 seconds, jQuery disable right click on image with example, 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 convert list object to JSON string in asp.net using c#, vb.net with example.

By using newtonsoft json we can easily convert list object to JSON string in asp.net. Following are the methods to convert list object to JSON string and JSON string to List Object in asp.net

JSON Serialization Method

Following is the serialize method to serialize list items into JSON string format.

C# Code


List<userdetails> details = new List<userdetails>();
userdetails user = new userdetails();
details.Add(new userdetails { userid = 1, username = "suresh", location = "chennai" });
string strserialize = JsonConvert.SerializeObject(details);

VB.NET Code


Dim details As New List(Of userdetails)()
Dim user As New userdetails()
details.Add(New userdetails() With {
.userid = 1,
.username = "suresh",
.location = "chennai"
})
Dim strserialize As String = JsonConvert.SerializeObject(details)

JSON DeSerialization Method

Following is the serialize method to serialize list items into JSON string format.

C# Code


string strmsg = "[{\"userid\":1,\"username\":\"suresh\",\"location\":\"chennai\"},{\"userid\":2,\"username\":\"rohini\",\"location\":\"guntur\"}]";
var user = JsonConvert.DeserializeObject<List<userdetails>>(strmsg);

VB.NET Code


Dim strmsg As String = "[{""userid"":1,""username"":""suresh"",""location"":""chennai""},{""userid"":2,""username"":""rohini"",""location"":""guntur""}]"
Dim user = JsonConvert.DeserializeObject(Of List(Of userdetails))(strmsg)

If you want complete example to implement serialization and deserialization for JSON data create new web application and open your Default.aspx page and write the code like as shown below.


<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>JSON Serialization and Deserialization in Asp.Net</title>
</head>
<body>
<form id="form1" runat="server">
<asp:Button ID="btnSerialize" runat="server" Text="Serialize" OnClick="btnSerialize_Click" />
<asp:Button ID="btnDeserialize" runat="server" Text="DeSerialize" OnClick="btnDeserialize_Click" />
<div>
Serialized Data: <asp:Label ID="lblserial" runat="server"/>
</div>
<div>
DeSerialized Data: <asp:Label ID="lbldeserial" runat="server"/>
</div>
</form>
</body>
</html>

Now open code behind file and write the code like as shown below

C# Code


using System;
using System.Collections.Generic;
using Newtonsoft.Json;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}

protected void btnSerialize_Click(object sender, EventArgs e)
{
List<userdetails> details = new List<userdetails>();
userdetails user = new userdetails();
details.Add(new userdetails { userid = 1, username = "suresh", location = "chennai" });
details.Add(new userdetails { userid = 2, username = "rohini", location = "guntur" });
details.Add(new userdetails { userid = 3, username = "praveen", location = "bangalore" });
details.Add(new userdetails { userid = 4, username = "sateesh", location = "vizag" });
details.Add(new userdetails { userid = 5, username = "madhav", location = "nagpur" });
details.Add(new userdetails { userid = 6, username = "honey", location = "nagpur" });
string strserialize = JsonConvert.SerializeObject(details);
lblserial.Text = strserialize;
}

protected void btnDeserialize_Click(object sender, EventArgs e)
{
string strmsg = "[{\"userid\":1,\"username\":\"suresh\",\"location\":\"chennai\"},{\"userid\":2,\"username\":\"rohini\",\"location\":\"guntur\"}]";
var user = JsonConvert.DeserializeObject<List<userdetails>>(strmsg);
}
}
class userdetails
{
public int userid { get; set; }
public string username { get; set; }
public string location { get; set; }
}

VB.NET Code


Imports Newtonsoft.Json
Partial Class VBCode
Inherits System.Web.UI.Page
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load

End Sub
Protected Sub btnSerialize_Click(sender As Object, e As EventArgs)
Dim details As New List(Of userdetails)()
Dim user As New userdetails()
details.Add(New userdetails() With {
.userid = 1,
.username = "suresh",
.location = "chennai"
})
details.Add(New userdetails() With {
.userid = 2,
.username = "rohini",
.location = "guntur"
})
details.Add(New userdetails() With {
.userid = 3,
.username = "praveen",
.location = "bangalore"
})
details.Add(New userdetails() With {
.userid = 4,
.username = "sateesh",
.location = "vizag"
})
details.Add(New userdetails() With {
.userid = 5,
.username = "madhav",
.location = "nagpur"
})
details.Add(New userdetails() With {
.userid = 6,
.username = "honey",
.location = "nagpur"
})
Dim strserialize As String = JsonConvert.SerializeObject(details)
lblserial.Text = strserialize
End Sub
Protected Sub btnDeserialize_Click(sender As Object, e As EventArgs)
Dim strmsg As String = "[{""userid"":1,""username"":""suresh"",""location"":""chennai""},{""userid"":2,""username"":""rohini"",""location"":""guntur""}]"
Dim user = JsonConvert.DeserializeObject(Of List(Of userdetails))(strmsg)
End Sub
End Class

Public 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

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 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

Now run the application to see the result that will be like as shown below.

Following is the result of Serializing Data

Following is the result of DeSerializing the JSON Data

This is how we can convert list object to JSON string and JSON string to list object in asp.net using c#, vb.net.

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3 comments :

Unknown said...

please post article on .net core with WEPAPI +sharepoint

Unknown said...

And also frond end Angular js 2

Unknown said...

Please suggest i am palnning to buid a project with following technologies
we are using Angularjs2+.netcore+Webapi+sharepoint.

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