Question

What’s the difference between Explicitly implement the interface and Implement the interface.

When you derive a class from an interface, intellisense suggest you to do both.

But, what’s the difference?

Answer 1

Another aspect of this:

If you implicitly implemented, it means that the interface members are accessible to users of your class without them having to cast it.

If it’s explicitly implemented, clients will have to cast your class to the interface before being able to access the members. Here’s an example of an explicit implementation:

    interface Animal {     void EatRoots();     void EatLeaves(); }  interface Animal2 {     void Sleep(); }   class Wombat : Animal, Animal2 {     // Implicit implementation of Animal2     public void Sleep()     {     }      // Explicit implementation of Animal     void Animal.EatRoots()     {      }      void Animal.EatLeaves()     {     }  } 

Your client code

Wombat w = new Wombat(); w.Sleep(); w.EatRoots();   // This will cause a compiler error because it's explicitly implemented ((Animal)w).EatRoots();  // This will compile