Question

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What is the static variable initialization order in C#?

For fun i ran this code

I was not expecting 2 2 3. I was expecting a compiler error (circlur dependency) or 8 5 3.

What are the rules to initialization order in C#?

-edit- i tried making a not static and i got what i expected. Why is b 2 before and now 5. I don’t think i’m going to like the rules… Luckily i never do anything like this so i haven’t had a problem.

using System;

public class Test
{
        public static void Main()
        {
                A.t();
        }
}

class A
{
    static int a = B.b + c;
    public static int c = 3;
    static public void t()
    {
        Console.WriteLine("{0} {1} {2}", a, B.b, c);
    }
}
class B
{
    public static int b = A.c+2;
}

Answer 1

Initialisation is per-type when needed (beforefieldinit notwithstanding). Withing a class: “textual order”:

§17.11 in ECMA 334:

If a class contains any static fields with initializers, those initializers are executed in textual order immediately prior to executing the static constructor.

It doesn’t apply for instance fields, since you can’t use instance values in a field initializer.