为什么在第一次调用 class 方法之前没有调用 static 构造函数

Question

According to Jon Skeet's artice C# and beforefieldinit and discussion in When is a static constructor called in C#? static constructor must be called before first call to a method of the class.

For some reason following code does not exhibit this behavior:

namespace AbstractAndStatic
{
    class Program
    {
        static void Main(string[] args)
        {
            StaticClass.Equals(1,2);
            StaticClass.foo();
        }
    }
    static class StaticClass : Object
    {
        public static void foo()
        {
            Console.WriteLine("Static");
        }
         static StaticClass()
        {
            Console.WriteLine("static constructor");
        }
    }
    class TestClass
    {
        public void deb()
        {
            Console.WriteLine("Test Class Debug");
        }
    }
}     

I am debugging the above code using the Visual Studio Debugger. When the statement StaticClass.Equals(1,2); gets executed in the Main method the static Constructor is not getting called but when StaticClass.foo(); is executed it calls static constructor and then call the foo method.

I am little confused as why it didn't get called the the first time when executing StaticClass.Equals(1,2); .

Answer 1

Your call to StaticClass.Equals is actually just a call to Object.Equals(Object, Object) , as StaticClass doesn't provide an applicable overload for Equals . If you look in the IL, you'll see that the compiler has resolved the call to just Object.Equals(1, 2) . If you're not calling a method which actually involves the static class, it doesn't need to be initialized.

Answer 2

The execution of a static constructor is triggered by the first of the following events to occur:

An instance of the class is created. Any of the static members of the class are referenced.