Returning JSON object from an ASP NET page

Question

In my particular situation  I have a couple of solutions to my problem  I want to find out which one is more feasible  In this case  I can also achieve my goal by returning a JSON object from my server side code  however  I do not know how it is done and what the best way of doing it is   First off  I don t need a full aspx page as I only need a response returned from code  So  do I use web services  a handler  or is there any other specific way to do this   Is this solution feasible  Do I build the JSON string using the StringBuilder class and inject that string into the target aspx page  Are there any precautions or things that I should be aware of   I appreciate your ideas   Regards   Kemal  ------------UPDATE  ------------  Suppose I have a JSON object in my userlist aspx page  which then I use with jQuery       menu        id    color1      value    color      popup          menuitem             value    Red            value    Green            value    Yellow                   example taken from the json org example page   Now when I want to add a new menu items from my aspx page  what do I do    I think this way my question is more specific     Lets assume I create a new string in my aspx code  as such    value    Blue    How do I inject this into the already existing itemlist in the target page  Or is this not the correct approach to this kind of situation  If not  how else can it be achieved   Also  if I wanted to fire a jQuery event when a new item is added to this list  how is this achieved   ------------UPDATE 2 on 26 August 2015 ------------  By the time I asked this question  the way I was approaching the problem was in another aspect  I am now more proficient in the subject and can gladly accept the most voted answer since the approach to this question clearly should not include the already existing JSON and output a new one from the code as  DavGarcia also suggests

User · Accepted Answer

In your Page Load you will want to clear out the normal output and write your own  for example   string json       name     Joe      Response Clear    Response ContentType    application json  charset utf-8   Response Write json   Response End      To convert a C  object to JSON you can use a library such as Json NET   Instead of getting your  aspx page to output JSON though  consider using a Web Service  asmx  or WCF  both of which can output JSON

User · Answer

If you get code behind  use some like this          MyCustomObject myObject   new MyCustomObject            myObject name  try             OBJECT - gt  JSON         var javaScriptSerializer   new System Web Script Serialization JavaScriptSerializer            string myObjectJson   javaScriptSerializer Serialize myObject             return JSON            Response Clear                 Response ContentType    application json  charset utf-8           Response Write myObjectJson            Response End      So you return a json object serialized with all attributes of MyCustomObject

User · Answer

no problem doing it with asp     it s most natural to do so with MVC  but can be done with standard asp as well   The MVC framework has all sorts of helper classes for JSON  if you can  I d suggest sussing in some MVC-love  if not  you can probably easily just get the JSON helper classes used by MVC in and use them in the context of asp net   edit   here s an example of how to return JSON data with MVC  This would be in your controller class  This is out of the box functionality with MVC--when you crate a new MVC project this stuff gets auto-created so it s nothing special  The only thing that I m doing is returning an actionResult that is JSON  The JSON method I m calling is a method on the Controller class  This is all very basic  default MVC stuff   public ActionResult GetData         var data   new   Name  kevin   Age 40        return Json data  JsonRequestBehavior AllowGet       This return data could be called via JQuery as an ajax call thusly     get   Reader GetData    function data    someJavacriptMethodOnData data

User · Answer

With ASP NET Web Pages you can do this on a single page as a basic GET example  the simplest possible thing that can work   var json   Json Encode new       orientation   Cache  orientation        alerted   Cache  alerted   as bool       since   Cache  since   as DateTime      Response Write json

[asp.net] Returning JSON object from an ASP.NET page

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