Added: C# Language Design Notes for May 17, 2017

[MadsTorgersen]

C# Language Design Notes for May 17, 2017

More questions about default interface member implementations

1. Conflicting override of default implementations
2. Can the Main entry point method be in an interface?
3. Static constructors in interfaces?
4. Virtual properties with private accessors
5. Does an override introduce a member?
6. Parameter names

Please discuss.

[gulshan]

👍 for static constructors in interfaces. But #169 may be another way to enable this.

[alrz]

Conflicting override of default implementations

But we already do pick an arbitrary impl (first in base list) in case of multiple interface implementations involving covariance,

void Main()
{
	IGeneric<Base> b = new DoubleDown();
        // prints "Derived1" or "Derived2" depending on the base order
	Console.WriteLine(b.GetName()); 
}

interface IGeneric<out T>
{
    string GetName();
}

class Base {}
class Derived1 : Base{}
class Derived2 : Base{}

class DoubleDown : IGeneric<Derived1>, IGeneric<Derived1> // order is important
{
   string IGeneric<Derived1>.GetName()
   {
     return "Derived1";
   }

   string IGeneric<Derived2>.GetName()
   {
     return "Derived2";
   }  
}