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

        private static bool NeedEscape(string src, int i)
        {
            char c = src[i];
            return c < 32 || c == '"' || c == '\\'
                // Broken lead surrogate
                || (c >= '\uD800' && c <= '\uDBFF' &&
                    (i == src.Length - 1 || src[i + 1] < '\uDC00' || src[i + 1] > '\uDFFF'))
                // Broken tail surrogate
                || (c >= '\uDC00' && c <= '\uDFFF' &&
                    (i == 0 || src[i - 1] < '\uD800' || src[i - 1] > '\uDBFF'))
                // To produce valid JavaScript
                || c == '\u2028' || c == '\u2029'
                // Escape "</" for <script> tags
                || (c == '/' && i > 0 && src[i - 1] == '<');
        }