c# - What is the purpose of new() while declaration of a generic class?

Question

What is the purpose of new() while declaration of BaseEntityCollection class?
If I'm going to remove it, I got an error with the following message "T must be a non-abstract type with a public parameterless constructor in order to use it as parameter ..."

public abstract partial class BaseEntityCollection<T> : 
       List<T> where T : BaseEntity, new()

Answer 1

It means that whatever class you specify for T, it has a default (no parameters) constructor.

Therefore, in the generic class, you can do new T() and it will create a new object of type T.