Kir-Antipov

// It's twice slower then `Obj is IMyInterface`
// But it's twice faster then any other check
// Based on my SO answer: https://ru.stackoverflow.com/a/945958/248572
public static bool Implements(object Obj, Type InterfaceType)
{
    unsafe
    {
        // MT Pointer of our interface
        IntPtr iMTPointer = InterfaceType.TypeHandle.Value;

Kir-Antipov

// It's twice slower then `Obj is IMyInterface`
// But it's twice faster then any other check
// Based on my SO answer: https://ru.stackoverflow.com/a/945958/248572
public static bool Implements(Type ObjectType, Type InterfaceType)
{
    unsafe
    {
        IntPtr iMTPointer = InterfaceType.TypeHandle.Value;

        void* methodTable = ObjectType.TypeHandle.Value.ToPointer();

Kir-Antipov

// A little bit faster then standard Type.GetInterfaces()
public static Type[] GetInterfaces(Type ObjectType)
{
    unsafe
    {
        void* methodTable = ObjectType.TypeHandle.Value.ToPointer();

        int count = ((ushort*)methodTable)[7];
        IntPtr* interfaces = (IntPtr*)((IntPtr*)methodTable)[9].ToPointer();

Kir-Antipov

// A little bit faster then standard Type.GetInterfaces()
public static Type[] GetInterfaces(object Obj)
{
    unsafe
    {
        TypedReference trObj = __makeref(Obj);
        IntPtr ptrObj = **(IntPtr**)&trObj;

        void* methodTable = (*(IntPtr*)ptrObj.ToPointer()).ToPointer();

Kir-Antipov

object obj = new List<int> { 1, 2, 3 };
TypedReference trObj = __makeref(obj);
IntPtr ptrObj = **(IntPtr**)&trObj;

Kir-Antipov

public class MyVoid
{
    public static readonly MyVoid Instance = new MyVoid();

    private MyVoid()
    {
        unsafe
        {
            MyVoid it = this;
            TypedReference typedReference = __makeref(it);

Kir-Antipov

public static bool Verify(string digits, string secret)
{
    if (string.IsNullOrEmpty(digits) || string.IsNullOrEmpty(secret))
        return false;

    long iterations = DateTimeOffset.Now.ToUnixTimeSeconds() / 30L;
    byte[] secretBytes = Base32ToBytes(secret);
    if (Verify(digits, secretBytes, iterations))
        return true;
    else