C# JS的Escape和UnEscape *0*

public static string Escape(string str)
{
 if (str == null)
  return String.Empty;
 StringBuilder sb = new StringBuilder();
 int len = str.Length;

 for (int i = 0; i <len; i++)
 {
  char c = str[i];

  //everything other than the optionally escaped chars _must_ be escaped
  if (Char.IsLetterOrDigit(c) || c == '-' || c == '_' || c == '/' || c == '\\' || c == '.')
   sb.Append(c);
  else
   sb.Append(Uri.HexEscape(c));
 }

 return sb.ToString();
}

public static string UnEscape(string str)
{
 if (str == null)
  return String.Empty;

 StringBuilder sb = new StringBuilder();
 int len = str.Length;
 int i = 0;
 
 while (i != len)
 {
  if (Uri.IsHexEncoding(str, i))
   sb.Append(Uri.HexUnescape(str, ref i));
  else
   sb.Append(str[i++]);
 }

 return sb.ToString();
}