public static string UrlEncode(string str, Encoding e)
{
if (str == null)
{
return(null);
}
if (str == String.Empty)
{
return(String.Empty);
}
bool needEncode = false;
int len = str.Length;
for (int i = 0; i < len; i++)
{
char c = str [i];
if ((c < '0') || (c < 'A' && c > '9') || (c > 'Z' && c < 'a') || (c > 'z'))
{
if (HttpEncoder.NotEncoded(c))
{
continue;
}
needEncode = true;
break;
}
}
if (!needEncode)
{
return(str);
}
// avoided GetByteCount call
byte [] bytes = new byte[e.GetMaxByteCount(str.Length)];
int realLen = e.GetBytes(str, 0, str.Length, bytes, 0);
return(Encoding.ASCII.GetString(UrlEncodeToBytes(bytes, 0, realLen)));
}