- Definition and Implementation
- Virtual methods allow derived classes to override base class behavior
- Virtual methods are declared using "virtual" keyword before return type
- Virtual methods cannot be static, abstract, constructors, or private
- Late Binding and Dynamic Dispatch
- C# uses late binding for method implementation at runtime
- Compiler creates virtual method table (v-table) for dynamic dispatch
- Dynamic dispatch determines correct implementation based on actual type
- Benefits and Drawbacks
- Enables framework development and testing with mock objects
- Promotes code reusability through polymorphism
- Can lower code readability with multiple levels of overriding
- May impact performance due to v-table lookups
- Usage Guidelines
- Virtual methods are useful for frameworks and testing
- Should be used carefully in performance-critical code
- Alternative approaches like interfaces or delegates recommended