How to convert an action to a defined delegate of the same signature?

Question

class Test
{
    public delegate void FruitDelegate(Fruit f);

    public void Notify(Action del) where T : Fruit
    {
        FruitDelegate f = d         


        

Answer 1

There is good reason you cannot do this. Suppose the rest of your method was:

class Test
{
    public delegate void FruitDelegate(Fruit f);

    public void Notify(Action del) where T : Fruit
    {
        FruitDelegate f = del; 
        f(new Banana());  //should be legal, but del may be Action
    }
}

That would definitely not work, so the compiler is correct here.