Re: Beginner interface question

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Thanks for the replies all, it makes more sense now. I thought it might
be a bit 'fiddly' casting to the interface type to call certain
methods, but after playing around, I found out this:

public interface IShape
{
double area();
double circumference();
int sides();
void blah();
}

public class Oblong :IShape
{
public int side;

public double area() { return (double)((side * side) * 2); }

public double circumference() { return ((double)(6 * side)); }

public int sides() { return 4; }
public Oblong() { side = 0;}

void IShape.blah(){ Console.WriteLine("Test"); }
}

public class Shape
{
public static void Main(string[] args)
{
Oblong myOb = new Oblong();
myOb.side = 5;
Console.WriteLine("Displaying Info:");
displayInfo(myOb);
}

static void displayInfo(IShape myShape)
{
Console.WriteLine("Area: {0}", myShape.area());
Console.WriteLine("Sides: {0}", myShape.sides());
Console.WriteLine("Circumference: {0}",
myShape.circumference());
myShape.blah();
}
}

using a method taking the interface type, I can perhaps see uses for
that.

A quick question:
If I had a number of objects which were not derived from the same base
class. Each of these objects had a load and save method, which were
called on every instanced object when the user selected a save event.
Would it be best to create a load/save interface, and then use a method
such as above. Or would it be best to use a function which calls every
object in turn, decides what form the object is and then load/save. Or
even factoring all objects which need load and save functionality into
a common base class? (the load or save could be something like
drawToScreen etc).

I'm trying to get my head around when best to use interfaces etc.

Thanks,

Chris

.

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