Limit the size of a generic collection?

Question

Is there any way to limit the size of a generic collection?

I have a Stack of WriteableBitmap which I am using to store a clone of a WriteableBitmap on each change, meaning that I can undo easily by simply Popping the most recent WriteableBitmap off the stack.

The problem is the memory usage, I want to limit this stack to hold 10 objects, but I can't see a property allowing me to easily do this. Is there a way, or am I going to have to check the stack size on each change, and copy the last 10 objects into a new stack whenever I hit 10, and on each subsequent change? I know how to do this, but was hoping that there was an easier way, is there?

Answer 1

You can use LinkedList which represents doubly link list to simulate Circular Stack.

You can you AddFirst() corresponding to Push(). If Count is 10, you can use RemoveLast().

For Pop() you can use RemoveFirst()

Answer 2

You have to implement your own wrapper to achieve that. There is no direct option available.

class FixedSizeStack : Stack
{
    private int MaxNumber;
    public FixedSizeStack(int Limit)
        : base()
    {
        MaxNumber = Limit;
    }

    public override void Push(object obj)
    {
        if (this.Count < MaxNumber)
            base.Push(obj);
    }

}