C#: Generic types that have a constructor?

Question

I have the following C# test code:

  class MyItem
  {
    MyItem( int a ) {}
  }

  class MyContainer< T >
    where T : MyItem, new()
  {
    public void          


        

Answer 1

C#, and VB.Net for that matter, do not support the notion of constraining a generic to have a constructor with specific parameters. It only supports constraining to have an empty constructor.

One work around is to have the caller pass in a factory lambda to create the value. For instance

public void CreateItem(Func del) {
  T oItem = del(10);
}

Call site

CreateItem(x => new SomeClass(x));