كيفية تنفيذ حقول البت في C#: دليل شامل

[global::System.AttributeUsage(AttributeTargets.Field, AllowMultiple = false)]
sealed class BitfieldLengthAttribute : Attribute
{
    uint length;

    public BitfieldLengthAttribute(uint length)
    {
        this.length = length;
    }

    public uint Length { get { return length; } }
}

static class PrimitiveConversion
{
    public static long ToLong<T>(T t) where T : struct
    {
        long r = 0;
        int offset = 0;

        foreach (System.Reflection.FieldInfo f in t.GetType().GetFields())
        {
            object[] attrs = f.GetCustomAttributes(typeof(BitfieldLengthAttribute), false);
            if (attrs.Length == 1)
            {
                uint fieldLength = ((BitfieldLengthAttribute)attrs[0]).Length;
                long mask = (1 << (int)fieldLength) - 1;

                r |= ((UInt32)f.GetValue(t) & mask) << offset;
                offset += (int)fieldLength;
            }
        }

        return r;
    }
}

struct PESHeader
{
    [BitfieldLength(2)]
    public uint reserved;

    [BitfieldLength(2)]
    public uint scrambling_control;

    [BitfieldLength(1)]
    public uint priority;

    [BitfieldLength(1)]
    public uint data_alignment_indicator;

    [BitfieldLength(1)]
    public uint copyright;

    [BitfieldLength(1)]
    public uint original_or_copy;
}

public class MainClass
{
    public static void Main(string[] args)
    {
        PESHeader p = new PESHeader
        {
            reserved = 3,
            scrambling_control = 2,
            data_alignment_indicator = 1
        };

        long l = PrimitiveConversion.ToLong(p);

        for (int i = 63; i >= 0; i--)
        {
            Console.Write(((l & (1L << i)) > 0) ? "1" : "0");
        }

        Console.WriteLine();
    }
}