Question

I have a handler that uploads a KML file and returns JSON with the KML file as an attribute:

context.Response.Write("{\"name\":\"" + FileName + 
"\",\"type\":\"" + FileType + 
"\",\"size\":\"" + FileSize + 
"\",\"region_id\":\"" + regionID + 
"\",\"kml\":\"" + HttpUtility.HtmlEncode(xmlData) + "\"}");

As you can see, I’m trying to encode the KML with HttpUtility.HtmlEncode but I get an error in my response:

uncaught exception: Invalid JSON

How can I property encode the XML/KML file in C# so I can later decode it in JavaScript?

Edit #1: per Cheeso’s comment
I’m using ASP.NET, .NET Version 4 on IIS 7.5 Windows 7. My handler is a ashx file. The response works fine if I leave out the KML data (HttpUtility.HtmlEncode(xmlData)) from the response.

Edit #2
I also tried using System.Web.Script.Serialization.JavaScriptSerializer per the moderator’s comment. I used it like such:

System.Web.Script.Serialization.JavaScriptSerializer serializer;
context.Response.Write("{\"name\":\"" + FileName + 
"\",\"type\":\"" + FileType + 
"\",\"size\":\"" + FileSize + 
"\",\"region_id\":\"" + regionID + 
"\",\"kml\":\"" + serializer.Serialize(xmlData) + "\"}");

I still get the same “Invalid JSON” error.

Answer 1

An HTML Encoder encodes < as < and so forth. That doesn’t help you get XML into JSON format. What you want is a JavaScript Encode. Use HttpUtility.JavaScriptStringEncode

http://msdn.microsoft.com/en-us/library/dd991914.aspx