Explicit interface implementation cannot be virtual

Question

For the record, I\'ve already seen this connect item but I can\'t really understand what would be the problem in supporting this.

Say I have the following code:

Answer 1

Being able to have explicit interface implementations be virtual would be useful in only one scenario: when a derived-class override needs to call the parent-class implementation. Unfortunately, even if explicit interface implementations could be made virtual, there wouldn't be any way for an overriding class to call its parent's implementation absent some new syntax for doing so. VB.net handles this nicely by allowing a method which implements an interface to be declared Protected with a different name from the interface's method. A derived class can thus override the Protected method (using the appropriate name), and that override can call the parent-class version (using the same name).