Question

I’ve 3 methods A(), B() and C(), both A() and B() call C(). In method C(), how can I know it call from A() or B()?

Answer 1

I don’t recommend this approach – other posters point out better ways of handling this. But if you really, really need to know who called you, without changing C()‘s parameters, you can do this:

static void A()
{
    C();
}

static void C()
{
    StackTrace st = new StackTrace();
    Console.WriteLine(st.GetFrame(1).GetMethod().Name); // prints "A"
}

Note that generating a StackTrace is somewhat costly. Not a big deal, though, unless you’re doing it in code that you’re calling very frequently.

Again, you almost certainly find a better way of doing whatever you’re trying to do.