等价于.Net 2.0中的Convert.ToChar（byte）？

Question

I'm confined to using only .Net 2.0 and trying to write something that will convert a byte to char.

Ideally I would use Convert.ToChar(buffer[i]); to get a char from a byte in a byte[] array but in .Net 2.0 this feature didn't exist. Using BitConverter.ToChar(buffer, i) seems to always result in array out of bounds errors.

Does anyone have a suggestion on how I might convert a byte to char in .Net 2.0?

Answer 1

If you just have a byte then you have to assume the character is ASCII. char is Unicode 16. The 1st 128 code values of ASCII map directly to Unicode. So try this

public char ToChar(byte b)
{
  if (b < 0 || b > 127)
     throw new ArgumentException("Not an ASCII character.");
  return (char) b;
}

UPDATE

Most network software now assumes a string is encoded in UTF-8. So if you know the number of bytes in the buffer then you should do

var s = Encoding.Utf8.GetString(buffer, i, n);

Where n is the number of bytes.