How to send back JSON in asp.net?

Question

Say I would have this in PHP:

<?php
 $year = date('Y');
 $month = date('m');
 echo json_encode(array(
 array(
 'id' => 111,
 'title' => "Event1",
 'start' => "$year-$month-10",
 'url' => "http://yahoo.com/"
 ),
 array(
 'id' => 222,
 'title' => "Event2",
 'start' => "$year-$month-20",
 'end' => "$year-$month-22",
 'url' => "http://yahoo.com/"
 )
 ));
?>

What could I do to get the equivillant in asp .net?

like if the user went to giveMeJson.aspx I would want it to return the same as giveMeSomeJson.php .

Thanks

Answer 1

In the code behind of an empty .aspx (using Json.Net):

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication1
{
 public partial class giveMeSomeJson : System.Web.UI.Page
 {
 protected override void OnLoad(EventArgs e)
 {
 Response.ContentType = "text/json";
 var year = DateTime.Now.Year;
 var month = DateTime.Now.Month;
 Response.Write(JsonConvert.SerializeObject(new[]
 {
 new
 {
 id = "111",
 title = "Event1",
 start = String.Format("{0}-{1}-10", year, month),
 url = "http://yahoo.com/"
 },
 new
 {
 id = "222",
 title = "Event2",
 start = String.Format("{0}-{1}-20", year, month),
 url = "http://yahoo.com/"
 }
 }));
 }
 }
}

OR, just with code in the .aspx:

<%@ Page Language="C#" %>
<%@ Import Namespace="Newtonsoft.Json" %>
<script runat="server">
 string json = JsonConvert.SerializeObject(new[]
 {
 new
 {
 id = "111",
 title = "Event1",
 start = String.Format("{0}-{1}-10", DateTime.Now.Year, DateTime.Now.Month),
 url = "http://yahoo.com/"
 },
 new
 {
 id = "222",
 title = "Event2",
 start = String.Format("{0}-{1}-20", DateTime.Now.Year, DateTime.Now.Month),
 url = "http://yahoo.com/"
 }
 }); 
</script>
<%= json %>

Answer 2

Without getting into the various ways to write to the output in ASP.NET (there are many), you can use the JavaScriptSerializer or JSON.NET to serialize a .NET array into JSON, then write that to the output.

With JSON.NET, it's:

Person[] arr = new[] { new Person { Name = "John" }, new Person { Name = "Jane" } };
string json = JsonConvert.SerializeObject(arr);

The json string can now be written to the response. You can use a Literal control, or <%= %> syntax, or write direct to the response object, etc.

EDIT:

The simplest example would be:

<%@ Page Language="C#" %>
<%@ Import Namespace="Newtonsoft.Json" %>
<%
 Person[] arr = new[] { new Person { Name = "John" }, new Person { Name = "Jane" } };
 string json = JsonConvert.SerializeObject(arr);
%>
<%= json %>

This does all the work on the page itself, like PHP, and writes the output to the page.

Answer 3

If you are using ASP.NET MVC then

public JsonResult GetSomeJson()
{
 var myModel = getSomeModel
 return Json(myModel);
}

---

Update- so webforms? I don't do webforms but it's something like

[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)] 
public MyModel GetSomeJson()
{
 MyModel myModel = getSomeModel;
 return myModel;
}