c#: how to read parts of a file? (DICOM)

Question

I would like to read a DICOM file in C#. I don\'t want to do anything fancy, I just for now would like to know how to read in the elements, but first I would actually like

Answer 1

Taken from EvilDicom.Helper.DicomReader from the Evil Dicom library:

 public static bool IsValidDicom(BinaryReader r)
    {
        try
        {
            //128 null bytes
            byte[] nullBytes = new byte[128];
            r.Read(nullBytes, 0, 128);
            foreach (byte b in nullBytes)
            {
                if (b != 0x00)
                {
                    //Not valid
                    Console.WriteLine("Missing 128 null bit preamble. Not a valid DICOM file!");
                    return false;
                }
            }
        }
        catch (Exception)
        {

            Console.WriteLine("Could not read 128 null bit preamble. Perhaps file is too short");
            return false;
        }

        try
        {
            //4 DICM characters
            char[] dicm = new char[4];
            r.Read(dicm, 0, 4);
            if (dicm[0] != 'D' || dicm[1] != 'I' || dicm[2] != 'C' || dicm[3] != 'M')
            {
                //Not valid
                Console.WriteLine("Missing characters D I C M in bits 128-131. Not a valid DICOM file!");
                return false;
            }
            return true;

        }
        catch (Exception)
        {

            Console.WriteLine("Could not read DICM letters in bits 128-131.");
            return false;
        }

    }