Practical advantage of generics vs interfaces

Question

What would be a practical advantage of using generics vs interfaces in this case:

void MyMethod(IFoo f) 
{
}

void MyMethod(T f) : where T : IFoo
{
         


        

Answer 1

• Calling a method through an interface is slower than calling it directly on the concrete type
• If the type implementing IFoo is a value type, the non-generic version will box the value of the parameter, and boxing can negatively affect performance (especially if you call this method very often)
• If your method returns a value, the generic version can return a T rather than a IFoo, which is convenient if you need to call a method of T on the result