c# - HTML hex to polish characters -

i'm downloading html file polish characters, , parsing string by:

public static string hextostring(string hex) {     var sb = new stringbuilder();     (int = 0; < hex.length; += 2)     {         string hexdec = hex.substring(i, 2);         int number = int.parse(hexdec, numberstyles.hexnumber);         char chartoadd = (char)number;         sb.append(chartoadd);     }     return sb.tostring(); } 

so when found %21 i'm sending 21 hextostring() , in return there !, ok, char ą represented %c4%85 (Ä) , whant ą char

the problem here treating hex codes if utf16 (which native format char), in fact utf8.

this easy resolve using utf8 encoding.

first, let's write handy stringtobytearray() method:

public static byte[] stringtobytearray(string hex) {     return enumerable.range(0, hex.length)         .where(x => x%2 == 0)         .select(x => convert.tobyte(hex.substring(x, 2), 16))         .toarray(); } 

now can convert hex string text so:

string hexstr = "c485"; // or whatever input hex string is.  var bytes = stringtobytearray(hexstr); string text = encoding.utf8.getstring(bytes);  // ...use text