How to retrieve JSON via ASP.Net context.Request

Question

var OrderInfo = { "ProductID": "ProductIDValue", "ProductName": "ProductName", "Quantity": 1, "Amount": 9999, "SLQuantity": 9999, "SLDate": "08/03/2010" };

            var DTO = { 'OrderInfo': OrderInfo };

            $.ajax({
                type: "POST",
                contentType: "application/json; charset=utf-8",
                url: "JasonHandler.ashx",
                data: JSON.stringify(DTO),
                dataType: "json"
            });

I'm trying to retrieve posted JSON data on server side in an ASHX file via this code string strrequest = context.Request["OrderInfo"];

but it always return null. What Am I doing wrong?

Answer 1

Request[] will only look at form params and quetystring. You will need to do a form post or use qs or parse the request body yourself.

Answer 2

I think you could get the request body out of HttpCurrent.Context.Request.GetResponse().

Its probably a good idea to verify the content-type header first.

Answer 3

1. get the request body from HttpCurrent.Context.Request.InputStream.
2. read the input stream and convert to string
3. use javascriptserializer to deserialize the json object to a strongly type object (ensure the json properties share the same name as the strongly type counter part)

Answer 4

Digging the Internet. I found that that IE has problem receiving POST request in full. @ronaldwidha's suggestion on InputStream is similar to what I have found. But rather than using javascriptserializer I use JSON.NET Code snippets is below and I hope this would help other with similar problem

public class JasonHandler : IHttpHandler {

public void ProcessRequest (HttpContext context) {

    context.Response.ContentType = "application/json";
    context.Response.ContentEncoding = Encoding.UTF8;

    System.IO.Stream body = context.Request.InputStream;
    System.Text.Encoding encoding = context.Request.ContentEncoding;
    System.IO.StreamReader reader = new System.IO.StreamReader(body, encoding);
    if (context.Request.ContentType != null)
    {
        context.Response.Write("Client data content type " + context.Request.ContentType);
    }
    string s = reader.ReadToEnd();
    string[] content = s.Split('&');
    for (int i = 0; i < content.Length; i++)
    {
        string[] fields = content[i].Split('=');
        //context.Response.Write("<div><strong>" + fields[0] + "</strong></div>");
        //context.Response.Write("<div>" + fields[1] + "</div> ");  
    }

    string jsonRecord = s;