services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
.AddCookie(options => //CookieAuthenticationOptions
{
    options.LoginPath = new Microsoft.AspNetCore.Http.PathString("/Account/Login");
});

public static void ForEach(int[] array, Action<int> action)
{
    for (int i = 0; i < array.Length; ++i)
        action(array[i]);
}

static void Method(int x)
{
    Console.WriteLine("Элемент: " + x);
}

int[] myarray = { 1, 3, 5, 7 };
ForEach(myarray, Method);

ForEach(myarray, (int x) => { Console.WriteLine("Элемент: " + x); });

ForEach(myarray, (x) => { Console.WriteLine("Элемент: " + x); });

ForEach(myarray, x => { Console.WriteLine("Элемент: " + x); });

ForEach(myarray, x => Console.WriteLine("Элемент: " + x));