source: binary-improvements/7dtd-server-fixes/src/JSON/JSONString.cs@ 183

using System;
using System.Text;

namespace AllocsFixes.JSON
{
        public class JSONString : JSONNode
        {
                private string value;

                public JSONString (string value)
                {
                        this.value = value;
                }

                public override string ToString ()
                {
                        if (value == null || value.Length == 0) {
                                return "\"\"";
                        }

                        int len = value.Length;

                        StringBuilder sb = new StringBuilder (len + 4);
                        String t;

                        foreach (char c in value) {
                                switch (c) {
                                        case '\\':
                                        case '"':
                                        case '/':
                                                sb.Append ('\\');
                                                sb.Append (c);
                                                break;
                                        case '\b':
                                                sb.Append ("\\b");
                                                break;
                                        case '\t':
                                                sb.Append ("\\t");
                                                break;
                                        case '\n':
                                                sb.Append ("\\n");
                                                break;
                                        case '\f':
                                                sb.Append ("\\f");
                                                break;
                                        case '\r':
                                                sb.Append ("\\r");
                                                break;
                                        default:
                                                if (c < ' ') {
                                                        t = "000" + String.Format ("X", c);
                                                        sb.Append ("\\u" + t.Substring (t.Length - 4));
                                                } else {
                                                        sb.Append (c);
                                                }
                                                break;
                                }
                        }

                        return string.Format ("\"{0}\"", sb.ToString ());
                }

        }
}