Constexpr like keyword in C#

Is there constexpr like functionality/syntax (that can be used at compile-time in functions in C++) available in C#?

in C++, I can have a function (e.g. Fibonacci) like below:

constexpr int Fibonacci(int n) {
  //cout << "Executed Fib" << endl;
  switch (n) {
    case 0: return 0;
    case 1: return 1;
    default:
       return Fibonacci(n - 1) + Fibonacci(n - 2);
  }
}

and I can check in the main to ensure the function is correct by doing something like:

int main()
{
   static_assert(Fibonacci(5) == 7, "Bad Program");
   ///...
}

That means I do not have to wait till run time to evaluate if the Fibonacci function will work. It is like a simple test at a compile-time. I am asking if I can do thing kind of thing in C#.

What I have tried:

I google for this. Found that someone in quora mentioned java is missing this.
https://www.quora.com/What-is-the-counterpart-to-the-C++-constexpr-clause-in-languages-like-Java-or-C[^]

Tags: C#