Converting a list of ints to a byte array

Question

I tried to use the List.ConvertAll method and failed. What I am trying to do is convert a List to byte[]

I copped out and went

Answer 1

To use the ConvertAll method you can do the following...

Assuming that you have a list of ints that are really byte values and you do not actually want the bytes required to make up an int, i.e. byte[][]:

public static class Utility {

   public static byte IntToByte(int i) {
       if(i < 0)
           return (byte)0;
       else if(i > 255)
           return (byte)255;
       else
           return System.Convert.ToByte(i);
   }
}

... to convert ...

byte[] array = listOfInts.ConvertAll(
                    new Converter(Utility.IntToByte) ).ToArray();

or you could use an anonymous delegate...

byte[] array = listOfInts.ConvertAll( new Converter(
                   delegate(int i) {
                       if(i < 0)
                          return (byte)0;
                       else if(i > 255)
                          return (byte)255;
                       else
                          return System.Convert.ToByte(i);
                   })).ToArray();