C# code confusion of where clause

问题

public interface ICrudService<T> where T: Entity, new()

What is the meaning of "new()" at the end of the above code?

回答1:

new() means that T has to have a parameterless constructor.

This is a help to enable you to construct objects of type T in your generic class/method:

public T Create()
{
   return new T();
}

来源：https://stackoverflow.com/questions/5461963/c-sharp-code-confusion-of-where-clause