Faloude Faloude - 1 year ago 63
C# Question

C# class works without initialisation (or call)

I just started learning C# (on Xamarin) and I'm confused about something, coming from a PHP background.

I used a fresh console project template and there is a class in Program.cs

using System;

namespace Test
class MainClass
public static void Main(string[] args)
Console.WriteLine("Hello World!");

This writes Hello World! to the console as expected. But the class
has never been initialized. Why is it executed?


Changing my question: Who executed the constructor?

Answer Source

Main is the entry point of the program. The operating system calls the Main method for you when you run the program. Because Main is a static method, it does not need to create an instance of MainClass to do so.

To be a valid entry point, the Main method must be static and have return type void or int, and either no parameters or a single string[] parameter. (See: https://msdn.microsoft.com/en-us/library/acy3edy3.aspx)

If you have multiple Main methods in your program that are valid entry points, you choose which one to use with compiler settings.