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

One pattern I use is to have the constrained class implement an interface which defines an Init method with the appropriate signature:

interface IMyItem
{
    void Init(int a);
}

class MyItem : IMyItem
{
    MyItem() {}
    void Init(int a) { }
}    

class MyContainer< T >
    where T : MyItem, IMyItem, new()
{
    public void CreateItem()
    {
        T oItem = new T();
        oItem.Init( 10 );
    }
}