Why is the .ctor() created when I compile C# code into IL?

Question

With this simple C# code, I run csc hello.cs; ildasm /out=hello.txt hello.exe.

class Hello
{
    public static void Main()
    {
        System.         


        

Answer 1

It's the default parameterless constructor. You're correct; it doesn't do anything (besides passing on to the base Object() constructor, which itself doesn't do anything special either anyway).

The compiler always creates a default constructor for a non-static class if there isn't any other constructor defined. Any member variables are then initialized to defaults. This is so you can do

new Hello();

without running into errors.