I am basically trying to implement a Strategy pattern, but I want to pass different parameters to the "interfaces" implementation (that inherit from the same object) and don't know if this is possible. Maybe I'm choosing the wrong pattern, I get an error similar to
'StrategyA' does not implement inherited abstract member 'void DoSomething(BaseObject)'
with the code below:
abstract class Strategy
{
public abstract void DoSomething(BaseObject object);
}
class StrategyA : Strategy
{
public override void DoSomething(ObjectA objectA)
{
// . . .
}
}
class StrategyB : Strategy
{
public override void DoSomething(ObjectB objectB)
{
// . . .
}
}
abstract class BaseObject
{
}
class ObjectA : BaseObject
{
// add to BaseObject
}
class ObjectB : BaseObject
{
// add to BaseObject
}
class Context
{
private Strategy _strategy;
// Constructor
public Context(Strategy strategy)
{
this._strategy = strategy;
}
// i may lose addtions to BaseObject doing this "downcasting" anyways?
public void ContextInterface(BaseObject obj)
{
_strategy.DoSomething(obj);
}
}
It sounds like you're actually trying to reinvent the Visitor pattern, instead of just using the Strategy pattern the way it was intended.
Also, since you're using C#, I'd recommend reading Judith Bishop's paper titled On the Efficiency of Design Patterns Implemented in C# 3.0. This covers multiple approaches to the visitor pattern in detail, and has some interesting, related useful ideas.