How to return a JSON object in standard web forms .Net

by

I would suggest an HttpHandler. No page lifecycle (so it is blazing fast) and much cleaner code-separation, as well as reusability.

Add a new item to your project of type “Generic Handler”. This will create a new .ashx file. The main method of any class that implements IHttpHandler is ProcessRequest. So to use the code from your original question: 

public void ProcessRequest (HttpContext context) {

    if(String.IsNullOrEmpty(context.Request["day"]))
    {
        context.Response.End(); 
    }

    string json = "";
    byte[] bytes = getByteArray();

    json = JsonConvert.SerializeObject(bytes);
    context.Response.ContentType = "text/json";
    context.Response.Write(json);
}

Change the url in your AJAX call and that should do it. The JavaScript would look like this , where GetFileHandler.ashx is the name of the IHttpHandler you just created:

$.ajax(
    {
        type: "POST",
        async: true,
        url: 'Handlers/GetFileHandler.ashx',
        data: "Day=" + $.toJSON(day),
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (msg) {
            console.log("SUCCESS:" + msg);
        },
        error: function (msg) {
            console.log("error:" + msg);
        }
    });

Another small point to consider, if you need access to the Session object from within the Handler code itself, make sure to inherit from the IRequiresSessionState interface:

public class GetFileHandler : IHttpHandler, IRequiresSessionState

More Related Contents:

  1. How do I format a Microsoft JSON date?
  2. Calling a ‘WebMethod’ with jQuery in ASP.NET WebForms
  3. How to parse JSON data with jQuery / JavaScript?
  4. Why the Ajax script is not running on IIS 7.5 Win 2008 R2 server?
  5. How can I use JQuery to post JSON data?
  6. Pass array to ajax request in $.ajax() [duplicate]
  7. json Uncaught SyntaxError: Unexpected token :
  8. Send JSON data via POST (ajax) and receive json response from Controller (MVC)
  9. TypeError: $.ajax(…) is not a function?
  10. jQuery loop over JSON result from AJAX Success?
  11. jQuery won’t parse my JSON from AJAX query
  12. CORS header ‘Access-Control-Allow-Origin’ missing
  13. jQuery posting valid json in request body
  14. JSONP request error handling
  15. How to return JSON from a 2.0 asmx web service
  16. What does .d in JSON mean?
  17. How to access JSON Object name/value?
  18. How to set encoding in .getJSON jQuery
  19. Basic Simple Asp.net + jQuery + JSON example
  20. Check if username exists in database with AJAX
  21. What does autocomplete request/server response look like?
  22. How do I PUT data to Rails using JQuery
  23. Post Nested Object to Spring MVC controller using JSON
  24. Populate Select box options on click with Javascript/Jquery with Json data
  25. Accessing web Service from jQuery – cross domain
  26. jQuery – How to PUT JSON via Ajax?
  27. AJAX Post of JavaScript String Array to JsonResult as List Always Returns Null?
  28. JSON parsing error syntax error unexpected end of input
  29. My Own Like Button: Django + Ajax — How?
  30. Jquery post and unobtrusive ajax validation not working mvc 4

Leave a Comment