c# - 类静态成员的奇怪行为——这怎么可能？

Question

考虑以下类:

public class MyClass
{
    public static string[] SomeAmazingConsts = { Const1 };
    public static string Const1 = "Constant 1";
    public static string Const2 = "Constant 2";
}

现在，检查用法:

class Program
{
    static void Main(string[] args)
    {
        string[] s = MyClass.SomeAmazingConsts;
        //s[0] == null
    }
}

问题是 s[0] == null!这到底是怎么发生的？现在，将 MyClass 的静态变量重新排序如下:

public class MyClass
{
    public static string Const1 = "Constant 1";
    public static string Const2 = "Constant 2";
    public static string[] SomeAmazingConsts = { Const1 };
}

一切开始正常工作。任何人都可以对此有所了解吗？

Answer 1

来自 10.4.5.1 Static field initialization

The static field variable initializers of a class correspond to a sequence of assignments that are executed in the textual order in which they appear in the class declaration.

因此初始化从上到下发生，在第一种情况下 Const1 尚未初始化，因此 null