source: binary-improvements/7dtd-server-fixes/src/JSON/JSONString.cs@ 327

using System.Text;

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

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

                public string GetString () {
                        return value;
                }

                public override void ToString (StringBuilder stringBuilder, bool prettyPrint = false, int currentLevel = 0) {
                        if (value == null || value.Length == 0) {
                                stringBuilder.Append ("\"\"");
                                return;
                        }

                        int len = value.Length;

                        stringBuilder.EnsureCapacity (stringBuilder.Length + 2 * len);

                        stringBuilder.Append ('"');

                        foreach (char c in value) {
                                switch (c) {
                                        case '\\':
                                        case '"':

//                                      case '/':
                                                stringBuilder.Append ('\\');
                                                stringBuilder.Append (c);
                                                break;
                                        case '\b':
                                                stringBuilder.Append ("\\b");
                                                break;
                                        case '\t':
                                                stringBuilder.Append ("\\t");
                                                break;
                                        case '\n':
                                                stringBuilder.Append ("\\n");
                                                break;
                                        case '\f':
                                                stringBuilder.Append ("\\f");
                                                break;
                                        case '\r':
                                                stringBuilder.Append ("\\r");
                                                break;
                                        default:
                                                if (c < ' ') {
                                                        stringBuilder.Append ("\\u");
                                                        stringBuilder.Append (((int) c).ToString ("X4"));
                                                } else {
                                                        stringBuilder.Append (c);
                                                }

                                                break;
                                }
                        }

                        stringBuilder.Append ('"');
                }

                public static JSONString Parse (string json, ref int offset) {
                        //Log.Out ("ParseString enter (" + offset + ")");
                        StringBuilder sb = new StringBuilder ();
                        offset++;
                        while (offset < json.Length) {
                                switch (json [offset]) {
                                        case '\\':
                                                offset++;
                                                switch (json [offset]) {
                                                        case '\\':
                                                        case '"':
                                                        case '/':
                                                                sb.Append (json [offset]);
                                                                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:
                                                                sb.Append (json [offset]);
                                                                break;
                                                }

                                                offset++;
                                                break;
                                        case '"':
                                                offset++;

                                                //Log.Out ("JSON:Parsed String: " + sb.ToString ());
                                                return new JSONString (sb.ToString ());
                                        default:
                                                sb.Append (json [offset]);
                                                offset++;
                                                break;
                                }
                        }

                        throw new MalformedJSONException ("End of JSON reached before parsing string finished");
                }
        }
}