Introducing JSON
page 5 of 9
by Bilal Haidar
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How to generate JSON on the server side

Generating a JSON string object on the server side can be easily done by using a StringBuilder object and appending the objects’ properties into the instance of the StringBuilder. For instance, you convert a C# object into string JSON string object as follows:

Listing 7

public class Person
{
  #region Member fields
  int id =  - 1;
  string name = "";
  #endregion
  #region Properties
  public int ID
  {
    get
    {
      return this.id;
    }
    set
    {
      this.id = value;
    }
  }
  public string Name
  {
    get
    {
      return this.name;
    }
    set
    {
      this.name = value;
    }
  }
  #endregion
 
  #region Constructors
  public Person(): this- 1, ""){}
 
  public Person(int id, string name)
  {
    this.id = id;
    this.name = name;
  }
  #endregion
}
 
// Create a new instance of Person object
Person p = new Person(5, "Bilal Haidar");
// Construct the JSON string object
StringBuilder sb = new StringBuilder();
sb.Append("{");
sb.AppendFormat("\"{0}\": \"{1}\"", p.ID, p.Name);
sb.Append("}");
Response.Write(sb.ToString());

You can see how easy it is to convert your business objects to JSON string objects. You just need to follow the JSON format and you are there!

If you had more complicated objects they might include arrays of objects or simple values. It is not wise to do the conversion yourself in a manual way. Therefore, I will guide you to a great JSON DLL that is called Jason.NET.

An example of how you can utilize the Jason.NET to get a JSON string object is shown in the listing below.

Listing 8

// create a new instance of the Person object
Person p = new Person(5, "Bilal Haidar");
// Convert the C# object into a JSON string object.
string jsonStringObj = JavaScriptConvert.SerializeObject(p);        
// Show the output which shall be something as:
// {"ID":5,"Name":"Bilal Haidar"} 
Response.Write(jsonStringObj);

You can see and feel how easy it is to use the JavaScriptConvert object to get your JSON string objects from the C# objects.

I will not go into details on how to use the Json.NET DLL. You can visit its site to get more tutorials on how to use this helpful DLL when generating JSON data.


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User Comments

Title: www   
Name: ww
Date: 2012-12-17 2:41:58 AM
Comment:
www
Title: Argument for Gun Control   
Name: Rick
Date: 2012-12-14 10:19:16 PM
Comment:
Time to take the guns away from the crazies
Title: demo   
Name: vishal
Date: 2012-11-30 7:20:06 AM
Comment:
i am new user....
Title: jason verification   
Name: madhan
Date: 2012-09-13 3:14:23 AM
Comment:
I need to check the jason
Title: fsgfds   
Name: sdfg
Date: 2012-08-15 3:06:30 PM
Comment:
fsdg
Title: dsavsd   
Name: vsdv
Date: 2012-07-10 7:14:56 AM
Comment:
lknvlksndv
Title: m,.,   
Name: ,m.,m.
Date: 2012-06-13 12:30:17 AM
Comment:
,m.,m.
Title: Re: Thanks   
Name: Bilal Haidar
Date: 2012-06-12 9:03:50 AM
Comment:
Most welcome Salman :)
Title: Thanks   
Name: Salman ansari
Date: 2012-06-12 8:59:06 AM
Comment:
Thankyou very much......very useful to me on learning stage of JSON
Title: answer to the query from DHEERAJ   
Name: isha
Date: 2011-05-06 2:05:06 AM
Comment:
cut and paste the 2 lines of code ie.
var postRequest = new HttpRequest();
postRequest.failureCallback = requestFailed; inside the function getemployeedetails on the default.js page in the beginning. Apllication runs fine then. thank you
Title: answer to the query from DHEERAJ   
Name: isha
Date: 2011-05-06 2:03:11 AM
Comment:
the query that dheeraj has asked, i faced the same. it is not the issue of IE7. if u check the Default.js page, there u will find 2 lines of code ie.
var postRequest = new HttpRequest();
postRequest.failureCallback = requestFailed;
written above the function getEmployeedetails().
please cut and paste these 2 lines inside this function in the beginning. the application runs fine then. thank you for this amazing application for beginners in JSON/JQUERY
Title: Best Tutorial   
Name: Yogesh Nandre
Date: 2011-01-20 2:35:00 AM
Comment:
Best due to very easy to learn for new one...
Title: Thank You   
Name: Suresh
Date: 2010-12-06 6:26:19 AM
Comment:
Very nice stuff
Title: Json   
Name: Wilmer Ferreira
Date: 2010-09-06 4:16:52 PM
Comment:
In Visual Studio 2010 exits the System.Runtime.Serialization.Json namespace
Title: JSON   
Name: Reshma
Date: 2010-09-06 3:52:38 AM
Comment:
This article gives me very useful and functionality information about json..
Title: JSON   
Name: Vikas
Date: 2010-05-19 12:22:22 AM
Comment:
This article provides me with the great help on what i needed the most
Title: JSON   
Name: Leela
Date: 2010-03-16 12:47:50 AM
Comment:
This article is very useful.
I am a beginner in .NET and i find many useful things ..)
Thankyou
Title: QUERY   
Name: DHIRAJ
Date: 2009-11-30 1:24:26 AM
Comment:
THERE IS SOME ERROR IN THIS ARTICLE. IF WE SELECT ANY NAME FROM DROPDOWNLIST IT DISPLAYS THE RECORD BUT IF WE SELECT ANOTHER NAME FROM DROPDOWNLIST IT DOES NOT DISPLAYS ANY RECORD.

Plz let me know on my email id:
dhiraj.pandey@nagsoft.com,dhirajkumarpandey@ymail.com
Waiting for ur reply on urgent basis....
Title: Re: IE7 issue   
Name: Martin
Date: 2008-04-04 2:10:49 AM
Comment:
Ok, but what can I do to make it work in IE7 ? I tryed to set postRequest = null; in the GetEmployeeDetails() method but then it turns back with an error ?
Title: Re:   
Name: Bilal Haidar [MVP]
Date: 2008-04-04 2:04:17 AM
Comment:
This is not a problem in the code! I once asked about that and they said it is an IE issue!! Didn't check later what they have done to solve it!

Thanks
Title: IE7 issue   
Name: Martin
Date: 2008-04-04 1:42:19 AM
Comment:
Hi,

I just downloaded the demo app and tested it in IE7 and when i select an "employee" from the dropdown list it shows up as expected, but when I try to choose another one from the dropdown nothing happens, is there an bug in the code ?
Title: Re:   
Name: Bilal Haidar [MVP]
Date: 2007-05-19 2:41:45 AM
Comment:
Yes it is :)

Regards
Title: Where is Jason?   
Name: AbsCoder
Date: 2007-05-18 6:16:26 PM
Comment:
Thanks for the article; good stuff. In the article you make mention twice of "great JSON DLL that is called Jason.NET". Perhaps, I'm dense, but I can't seem to locate said DLL. Do you mean Newtonsoft's Json.NET library? Again, thanks for your contribution to the community!






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