Escaping double quotes in JSON array using Json.NET

Question

I'm using Json.NET to generate some JSON that I write into a webrequest stream. Here's the code I'm using:

dynamic jsonObject = new JObject();
jsonObject.keyName1 = "XXX";
jsonObject.keyName2 = 180539;
jsonObject.keyName3 = new JArray() as dynamic;

dynamic jsonObject2 = new JObject();
jsonObject2.what = "xxxxx";
jsonObject.keyName3.Add(jsonObject2);

jsonObject2 = new JObject();
jsonObject2.what = "yyyyy";
jsonObject2.duration = 30;
jsonObject.keyName3.Add(jsonObject2);

jsonObject2 = new JObject();
jsonObject2.what = "zzzz";
jsonObject2.keyName3.Add(jsonObject2);

jsonObject.keyName4 = "123";

string json = JsonConvert.SerializeObject(jsonObject);

This code produces the following JSON:

{
  "keyName1": "XXX",
  "keyName2": 180539,
  "keyName3": [
    {"what": "xxxxx"},
    {"what": "yyyyy", "duration":30},
    {"what": "zzzzz"}],
  "keyName4":"123"
}

Unfortunately, the web service that processes this JSON expects the keys and values inside of an array as well as the array itself to be escaped like this:

{
  "keyName1": "XXX",
  "keyName2": 180539,
  "keyName3": "[
    {\"what\":\"xxxxx\"},
    {\"what\":\"yyyyy\",\"duration\":30},
    {\"what\":\"zzzzz\"}]",
  "keyName4":"123"
}

Is it possible to do this with Json.NET?

Answer 1

Here is the solution:

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

...

dynamic jsonObject = new JObject();
jsonObject.keyName1 = "XXX";
jsonObject.keyName2 = 180539;
jsonObject.keyName3 = new JArray() as dynamic;

dynamic jsonArrayObject = new JArray() as dynamic;

dynamic jsonObject2 = new JObject();
jsonObject2.what = "xxxxx";
jsonArrayObject.Add(jsonObject2);

jsonObject2 = new JObject();
jsonObject2.what = "yyyyy";
jsonObject2.duration = 30;
jsonArrayObject.Add(jsonObject2);

jsonObject2 = new JObject();
jsonObject2.what = "zzzz";
jsonArrayObject.Add(jsonObject2);

var jsonArrayString = JsonConvert.SerializeObject(jsonArrayObject, Formatting.None);

jsonObject.keyName3 = jsonArrayString;
jsonObject.keyName4 = "123";

string json = JsonConvert.SerializeObject(jsonObject, Formatting.None);

Answer 2

在.Net4 +中System.Web.HttpUtility.JavaScriptStringEncode