public static QueryParamCollection ParseQueryString(string query, Encoding encoding)
{
if (query == null)
{
throw new ArgumentNullException("query");
}
if (encoding == null)
{
throw new ArgumentNullException("encoding");
}
if (query.Length == 0 || (query.Length == 1 && query[0] == '?'))
{
return(new QueryParamCollection());
}
if (query[0] == '?')
{
query = query.Substring(1);
}
QueryParamCollection result = new QueryParamCollection();
ParseQueryString(query, encoding, result);
return(result);
}
internal static void ParseQueryString(string query, Encoding encoding, QueryParamCollection result)
{
if (query.Length == 0)
{
return;
}
string decoded = HtmlDecode(query);
int decodedLength = decoded.Length;
int namePos = 0;
bool first = true;
while (namePos <= decodedLength)
{
int valuePos = -1, valueEnd = -1;
for (int q = namePos; q < decodedLength; q++)
{
if (valuePos == -1 && decoded[q] == '=')
{
valuePos = q + 1;
}
else if (decoded[q] == '&')
{
valueEnd = q;
break;
}
}
if (first)
{
first = false;
if (decoded[namePos] == '?')
{
namePos++;
}
}
string name, value;
if (valuePos == -1)
{
name = null;
valuePos = namePos;
}
else
{
name = UrlDecode(decoded.Substring(namePos, valuePos - namePos - 1), encoding);
}
if (valueEnd < 0)
{
namePos = -1;
valueEnd = decoded.Length;
}
else
{
namePos = valueEnd + 1;
}
value = UrlDecode(decoded.Substring(valuePos, valueEnd - valuePos), encoding);
result.Add(name, value);
if (namePos == -1)
{
break;
}
}
}