Thread: Get a list of member variables

Hey everyone, I've been wondering about this, but can't find anything about it.

Basically, I've got a class, and a list of that class:

Code:

public class Person
{
    public Rectangle boundingBox;
    public int health;
}

List<Person> personList = new List<Person>();

And I've got a function that takes a list of rectangles:

Code:

private void CheckBoundingBoxes(List<Rectangle> boundingBoxes)
{
    // Do stuff...
}

Now, is it possible that instead of doing this to generate a list of rectangles based on each persons bounding box:

Code:

List<Rectangle> boundingBoxList = new List<Rectangle>(personList.Count);

for (int i = 0; i < personList.Count; ++i)
{
    boundingBoxList.Add(personList[i].boundingBox);
}

CheckBoundingBoxes(boundingBoxList);

I can just access the bounding box variable directly, something like:

Code:

CheckBoundingBoxes(new List<Rectangle>( personList { boundingBox } ) );

to do the same thing?

I appreciate any help I get in regards to this

You could probably use a foreach() loop to ease it a bit:

Code:

List<Rectangle> boundingBoxList = new List<Rectangle>();

foreach(Person p in personList)
    boundingBoxList.Add(p.boundingBox);

CheckBoundingBoxes(boundingBoxList);

LINQ might be able to do something like this as well, I believe what would do it is:

Code:

from p in personList select p.boundingBox

...but I have no idea what type that returns. :-) Regardless, it's probably an IEnumerable<Rectangle>, so you might want to consider having your CheckBoundingBoxes function accept that instead of a list.

Use:

Code:

using System.Linq;

CheckBoundingBoxes(personList.Select(p => p.boundingBox).ToList());