文件编码不起作用

Question

In my code

string[] Lines = reactor.GetMergedLines();
string fileName = "foo.bar";
StreamWriter sw = new StreamWriter(File.Open(fileName, FileMode.CreateNew), Encoding.GetEncoding(28605));
foreach (string line in Lines)
{
    sw.WriteLine(line);
}
sw.Close();

the file, which gets created is not encoded with the given codepage. Lines is filled with strings out of an iso-8859-1-file. I tried it with the code page number Encoding.GetEncoding(28605) , it's name Encoding.GetEncoding("ISO-8859-15") and with File.WriteAllLines(fileName, Lines, Encoding.GetEncoding(28605)) instead of StreamWriter. But if I take a look at the file with cygwin file -bi [filename] , it tells me, the encoding would be "us-ascii". Also, some characters aren't encoded properly and replaced by question marks.

How to write out a text file in C# with a code page other than utf-8? didn't helped, as you can see.

What is the problem?

Answer 1

You can use other overloads of Encoding.GetEncoding to handle all cases when an Unicode character can't be converted to your target code page. More information on this MSDN topic . The same could be achieved if you explicitly set the Encoding.EncoderFallback property ( link to MSDN ).

For example you can use the following to throw an exception every time when conversion of one Unicode character fails:

Encoding enc = Encoding.GetEncoding(28605, EncoderFallback.ExceptionFallback, DecoderFallback.ExceptionFallback);

Note: The default EncoderFallback is System.Text.InternalEncoderBestFitFallback which produces question marks for unknown code points.