Checking current value of an array, C#

Question

I have created an array with a predefined length of 2. And I have a method for adding items to the array.

The code for it is:

 public void addItem(T item)
 {
   Array.Resize(ref items, items.Count() + 2);
   items[items.Count() - 2] = item;
 }

Now, what I want to do is that it first has to check the array size and see if the array is full of not. If the array is full, it should double the size of the array. If its not full then it shouldn't do nothing. So, I'm wondering if I can make this possible with an if statement?

EDIT: Im writing an collection class, thats why I need to check the array

Sounds like you are reinventing the List<T> class? May I ask why? — Darin Dimitrov
– Darin Dimitrov, Commented Mar 14, 2013 at 9:14
Why don't you use a List<T> is has this functionality already built-in? — Tim Schmelter
– Tim Schmelter, Commented Mar 14, 2013 at 9:14
I guess this is homework, which is why he can't use the built-in stuff. — Matthew Watson
– Matthew Watson, Commented Mar 14, 2013 at 9:19

Tim Schmelter · Accepted Answer · 2013-03-14 09:15:55Z

1

You should really get familiar with the List<T> which already uses this functionality by default:

List.Add for example calls EnsureCapacity:

private void EnsureCapacity(int min)
{
    if (this._items.Length < min)
    {
        int num = (this._items.Length == 0) ? 4 : (this._items.Length * 2);
        if (num < min)
        {
            num = min;
        }
        this.Capacity = num;
    }
}

answered Mar 14, 2013 at 9:15

Tim Schmelter

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2 Comments

user2167085 Over a year ago

Yes, but I am writing an collection class and Im not allowed to use the generic collections

Tim Schmelter Over a year ago

So is this homework. Ok, but it's not clear what problem you actually have. You could look at the implementation of List<T>(i used ILSpy) to see how MS did it.

Anton · Accepted Answer · 2013-03-14 09:37:07Z

0

You should know, that you do not learn anything, if you do not do your homework on your own

but try something like this:

if count > size -2 than resize: size*2 else //do nothing

maybe you can add a feature like: if count < size / 4 than shift entries to the front and resize: size/2 else //nothing

hope this advise is useful for you

answered Mar 14, 2013 at 9:37

Anton

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