C# Constructor - why default constructor is generated by compiler only if there is no constructor, instead of when there is no default constructor

Question

According to MSDN\'s design guide for constructors,

\"If you don’t explicitly declare any constructors on a type, many languages (suc

Answer 1

Because not all classes should be constructed parameterless.

Consider a class that is designed to implement the interface between your application and a file on disk. It would be very inconvenient having to handle the case where the object is constructed without specifying which file to manage.

As such, since the main point of creating a non-static class is that you want to create objects of it, you're spared having to add an empty parameterless constructor if that is all you want to have.

Once you start adding constructors at all, then the automagic is disabled and no default constructor will be provided.