.Net中如何将一个实例的内存二进制内容读出来(超简单方法)

public static class BytesPrinter
{
    public unsafe static void PrintBytes<T>(T value)
    {
        var size = SizeCalculator.Instance.SizeOf(() => value);
        var bytes = new byte[size];
        var pointer = Unsafe.AsPointer(ref value);
        IntPtr head = typeof(T).IsValueType ? new IntPtr(pointer) : *(IntPtr*)pointer - IntPtr.Size;
        Marshal.Copy(head, bytes, 0, size);
        Console.WriteLine($"[{size}]{BitConverter.ToString(bytes)}");
    }
    public static string AsString(this IntPtr ptr) => BitConverter.ToString(BitConverter.GetBytes(ptr.ToInt64()));
}

public class SizeCalculator
{
    private static readonly ConcurrentDictionary<Type, int> _sizes = new();
    private static readonly MethodInfo _getDefaultMethod = typeof(SizeCalculator).GetMethod(nameof(GetDefault), BindingFlags.Static | BindingFlags.NonPublic)!;
    public static readonly SizeCalculator Instance = new();
    public int SizeOf(Type type, Func<object?>? instanceAccessor = null)
    {
        if (_sizes.TryGetValue(type, out var size)) return size;
        if (type.IsValueType) return _sizes.GetOrAdd(type, CalculateValueTypeInstance);
        object? instance;
        try
        {
            instance = instanceAccessor?.Invoke() ?? Activator.CreateInstance(type);
        }
        catch
        {
            throw new InvalidOperationException("The delegate to get instance must be specified.");
        }
        return _sizes.GetOrAdd(type, type => CalculateReferenceTypeInstance(type, instance));
    }
    public int SizeOf<T>(Func<T>? instanceAccessor = null)
    {
        if (instanceAccessor is null) return SizeOf(typeof(T));
        Func<object?> accessor = () => instanceAccessor();
        return SizeOf(typeof(T), accessor);
    }
    public int CalculateValueTypeInstance(Type type)
    {
        var instance = GetDefaultAsObject(type);
        var fields = type.GetFields(BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
            .Where(it => !it.IsStatic)
            .ToArray();
        if (fields.Length == 0) return 0;
        var tupleType = typeof(ValueTuple<,>).MakeGenericType(type, type);
        var tupple = tupleType.GetConstructors()[0].Invoke(new object?[] { instance, instance });
        var addresses = GenerateFieldAddressAccessor(tupleType.GetFields()).Invoke(tupple).OrderBy(it => it).ToArray();
        return (int)(addresses[2] - addresses[0]);
    }
    public int CalculateReferenceTypeInstance(Type type, object? instance)
    {
        var fields = GetBaseTypesAndThis(type)
            .SelectMany(type => type.GetFields(BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
            .Where(it => !it.IsStatic).ToArray();
        if (fields.Length == 0) return type.IsValueType ? 0 : 3 * IntPtr.Size;
        var addresses = GenerateFieldAddressAccessor(fields).Invoke(instance);
        var list = new List<FieldInfo>(fields);
        list.Insert(0, null!);
        fields = list.ToArray();
        Array.Sort(addresses, fields);
        var lastFieldOffset = (int)(addresses.Last() - addresses.First());
        var lastField = fields.Last();
        var lastFieldSize = lastField.FieldType.IsValueType ? CalculateValueTypeInstance(lastField.FieldType) : IntPtr.Size;
        var size = lastFieldOffset + lastFieldSize;
        // Round up to IntPtr.Size
        int round = IntPtr.Size - 1;
        return ((size + round) & (~round)) + IntPtr.Size;
        static IEnumerable<Type> GetBaseTypesAndThis(Type? type)
        {
            while (type is not null)
            {
                yield return type;
                type = type.BaseType;
            }
        }
    }
    private static Func<object?, long[]> GenerateFieldAddressAccessor(FieldInfo[] fields)
    {
        var method = new DynamicMethod(
            name: "GetFieldAddresses",
            returnType: typeof(long[]),
            parameterTypes: new[] { typeof(object) },
            m: typeof(SizeCalculator).Module,
            skipVisibility: true);
        var ilGen = method.GetILGenerator();
        // var addresses = new long[fields.Length + 1];
        ilGen.DeclareLocal(typeof(long[]));
        ilGen.Emit(OpCodes.Ldc_I4, fields.Length + 1);
        ilGen.Emit(OpCodes.Newarr, typeof(long));
        ilGen.Emit(OpCodes.Stloc_0);
        // addresses[0] = address of instace;
        ilGen.Emit(OpCodes.Ldloc_0);
        ilGen.Emit(OpCodes.Ldc_I4, 0);
        ilGen.Emit(OpCodes.Ldarg_0);
        ilGen.Emit(OpCodes.Conv_I8);
        ilGen.Emit(OpCodes.Stelem_I8);
        // addresses[index] = address of field[index + 1];
        for (int index = 0; index < fields.Length; index++)
        {
            ilGen.Emit(OpCodes.Ldloc_0);
            ilGen.Emit(OpCodes.Ldc_I4, index + 1);
            ilGen.Emit(OpCodes.Ldarg_0);
            ilGen.Emit(OpCodes.Ldflda, fields[index]);
            ilGen.Emit(OpCodes.Conv_I8);
            ilGen.Emit(OpCodes.Stelem_I8);
        }
        ilGen.Emit(OpCodes.Ldloc_0);
        ilGen.Emit(OpCodes.Ret);
        return (Func<object?, long[]>)method.CreateDelegate(typeof(Func<object, long[]>));
    }
    private static T GetDefault<T>() where T : struct => default!;
    private static object? GetDefaultAsObject(Type type) => _getDefaultMethod.MakeGenericMethod(type).Invoke(null, Array.Empty<object>());
}

BytesPrinter.PrintBytes(new FoobarStructure(255, 65535));
BytesPrinter.PrintBytes(new FoobarClass(255, 65535));
public struct FoobarStructure
{
    public byte Foo;
    public int Bar;
    public FoobarStructure(byte foo, int bar)
    {
        Foo = foo;
        Bar = bar;
    }
}
public class FoobarClass
{
    public byte Foo;
    public int Bar;
    public FoobarClass(byte foo, int bar)
    {
        Foo = foo;
        Bar = bar;
    }
}

[8][FF-00-00-00]-[FF-FF-00-00]
[24][00-00-00-00-00-00-00-00]-[38-39-78-B3-FD-7F-00-00]-[FF-FF-00-00-FF-00-00-00]

await Task.Yield();
PrintThreadId();
var foobar = new Foobar();
lock (foobar)
{
    BytesPrinter.PrintBytes(foobar);
    lock (foobar)
    {
        BytesPrinter.PrintBytes(foobar);
        lock (foobar)
        {
            BytesPrinter.PrintBytes(foobar);
            Debugger.Break();
        }
    }
}
static void PrintThreadId()
{
    var bytes = BitConverter.GetBytes(Environment.CurrentManagedThreadId);
    Console.WriteLine($"Thread Id: {BitConverter.ToString(bytes)}");
}
public class Foobar{}

var foobar = new Foobar();
var hashCode = foobar.GetHashCode();
PrintHashCode(hashCode);
BytesPrinter.PrintBytes(foobar);
static void PrintHashCode(int hashCode)
{
    var bytes = BitConverter.GetBytes(hashCode);
    Console.WriteLine($"Hash Code: {BitConverter.ToString(bytes)}");
}

public class Foobar
{
    public override int GetHashCode() => int.MaxValue;
}

var foobar = new Foobar();
foobar.GetHashCode();
lock (foobar)
{
    BytesPrinter.PrintBytes(foobar);
    Debugger.Break();
}
public class Foobar{}