System.Json.JsonValue.EscapeString C# (CSharp) Method

        internal static string EscapeString(string src)
        {
            if (src != null)
            {
                for (int i = 0; i < src.Length; i++)
                {
                    if (NeedEscape(src, i))
                    {
                        var sb = new StringBuilder();
                        if (i > 0)
                        {
                            sb.Append(src, 0, i);
                        }
                        return DoEscapeString(sb, src, i);
                    }
                }
            }

            return src;
        }