System.Net.Http.Headers.ByteArrayHeaderParser.TryParseValue C# (CSharp) Method

        public override bool TryParseValue(string value, object storeValue, ref int index, out object parsedValue)
        {
            parsedValue = null;

            // Some headers support empty/null values. This one doesn't.
            if (string.IsNullOrEmpty(value) || (index == value.Length))
            {
                return false;
            }

            string base64String = value;
            if (index > 0)
            {
                base64String = value.Substring(index);
            }

            // Try convert the string (we assume it's a valid Base64 string) to byte[].
            try
            {
                parsedValue = Convert.FromBase64String(base64String);
                index = value.Length;
                return true;
            }
            catch (FormatException e)
            {
                if (NetEventSource.IsEnabled) NetEventSource.Error(this, SR.Format(SR.net_http_parser_invalid_base64_string, base64String, e.Message));
            }

            return false;
        }
    }