c# - Convert a file to UTF-8 without streamwriter -

is there way convert file stream data utf-8 file stream without making use of stream writer, of reading line line , writing utf-8 file, there faster way of converting file utf-8 encoding

 using(streamwriter writer = new streamwriter(destinationfile, system.text.encoding.utf8)) {      string line = "";      while ((line = reader.readline()) != null) {          writer.writeline(line);      }   } 

is there overload method in memory stream or filestream convert file utf8 encoded file

yes:

string text = file.readalltext(srcfilename); file.writealltext(dstfilename, text, system.text.encoding.utf8); 

edit: reply request in comment

surrogates utf-8 characters require more 1 byte (at least 2 there may more). let's block 1024 bytes long (this problem arises block length, but: larger blocks are, less probability break surrogate). surrogate broken when spans across block boundary, shown here:

block index character comment 0     0             block start 0     1     b ... 0     1022  0     1023  €         block end, character 3 bytes long --------------------- 1     1024  € (+1)    second surrogate byte of character 1     1025  € (+2)    third surrogate byte of character ... 

as can see, three-byte character € broken between 2 blocks. when streaming in/out block @ time, these cases have handled correctly in code.

for more examples , explanations actual codes see wikipedia, possibly not more thorough , precise are.