Difference between default constructor and paramterless constructor?

Question

A default constructor has no parameters. And nor does a constructor that you write with no parameters. So what is the ultimate difference in c#?

Added to this when you inherit a default constructor and a parameterless constructor are they exposed on the inheritting type exactly the same? Because my IOC container doesn't seem to think so. (Unity).

Cheers, Pete

Answer 1

The "default" constructor is added by the C# compiler if your class does not contain an explicit instance constructor. It is a public, parameterless constructor. If you have created an explicit non-public, parameterless constructor, Unity will not be able to use it in the same way it would have used a public constructor (regardless of whether this was generated by the compiler, and regardless of whether it had parameters).

Answer 2

You can override the behaviour of the default constructor by creating a parameterless constructor. A common use of this is when you have a custom object as a member of your class and you need to initialize it with a default value when an instance of your class created.