System.Net.HttpListenerRequest.Helpers.FillFromString C# (CSharp) Method

            internal static void FillFromString(NameValueCollection nvc, string s, bool urlencoded, Encoding encoding)
            {
                int l = (s != null) ? s.Length : 0;
                int i = (s.Length > 0 && s[0] == '?') ? 1 : 0;

                while (i < l)
                {
                    // find next & while noting first = on the way (and if there are more)

                    int si = i;
                    int ti = -1;

                    while (i < l)
                    {
                        char ch = s[i];

                        if (ch == '=')
                        {
                            if (ti < 0)
                                ti = i;
                        }
                        else if (ch == '&')
                        {
                            break;
                        }

                        i++;
                    }

                    // extract the name / value pair

                    string name = null;
                    string value = null;

                    if (ti >= 0)
                    {
                        name = s.Substring(si, ti - si);
                        value = s.Substring(ti + 1, i - ti - 1);
                    }
                    else
                    {
                        value = s.Substring(si, i - si);
                    }

                    // add name / value pair to the collection

                    if (urlencoded)
                        nvc.Add(
                           name == null ? null : UrlDecodeStringFromStringInternal(name, encoding),
                           UrlDecodeStringFromStringInternal(value, encoding));
                    else
                        nvc.Add(name, value);

                    // trailing '&'

                    if (i == l - 1 && s[i] == '&')
                        nvc.Add(null, "");

                    i++;
                }
            }
        }