Question

byte[] tagData = GetTagBytes(tagID, out tiffDataType, out numberOfComponents);
string str = Encoding.ASCII.GetString(tagData);

With windows phone platform, the framework doesn’t support Encoding.ASCII.GetString() method.

I used to get help from Passant’s post ASCIIEncoding In Windows Phone 7 befroe. But it only convert string to byte[], now I need to convert byte[] into string.

Any Help would be nice~

Answer 1

If you try to understand how Hans’ code works, you’ll easily come up with the reverse conversion:

public static string AsciiToString(byte[] bytes) { 
        StringBuilder sb = new StringBuilder(bytes.Length); 
        foreach(byte b in bytes) {
            sb.Append(b<=0x7f ? (char)b : '?'); 
        } 
        return sb.ToString(); 
    } 

You can also use LINQ but a nice solution is available only on .NET 4.0:

string AsciiToString(byte[] bytes)
{
  return string.Concat( bytes.Select(b => b <= 0x7f ? (char)b : '?') );
}

The unfortunate lack of the String.Concat<T>(IEnumerable<T>) overload in former versions of the framework forces you to use the somewhat ugly and inefficient:

string AsciiToString(byte[] bytes)
{
  return string.Concat( 
    ( bytes.Select(b => (b <= 0x7f ? (char)b : '?').ToString()) )
    .ToArray()
    );
}