public static string UrlDecode(string s, Encoding encoding)
{
if (s == null || s.Length == 0 || !s.Contains(new char[]
{
'%',
'+'
}))
{
return(s);
}
if (encoding == null)
{
encoding = Encoding.UTF8;
}
int length = s.Length;
List <byte> list = new List <byte>();
for (int i = 0; i < length; i++)
{
char c = s[i];
if (c == '%' && i + 2 < length && s[i + 1] != '%')
{
int @char;
if (s[i + 1] == 'u' && i + 5 < length)
{
@char = HttpUtility.GetChar(s, i + 2, 4);
if (@char != -1)
{
HttpUtility.WriteCharBytes(list, (char)@char, encoding);
i += 5;
}
else
{
HttpUtility.WriteCharBytes(list, '%', encoding);
}
}
else if ((@char = HttpUtility.GetChar(s, i + 1, 2)) != -1)
{
HttpUtility.WriteCharBytes(list, (char)@char, encoding);
i += 2;
}
else
{
HttpUtility.WriteCharBytes(list, '%', encoding);
}
}
else if (c == '+')
{
HttpUtility.WriteCharBytes(list, ' ', encoding);
}
else
{
HttpUtility.WriteCharBytes(list, c, encoding);
}
}
byte[] bytes = list.ToArray();
return(encoding.GetString(bytes));
}