asked on

foreach index

When using foreach is it possible to get the index of the loop when certain condition become true?

For example:
foreach(MyObject o in oList){
if(o.Id==5){
//Find index of the oList
}
}

ASKER CERTIFIED SOLUTION

Jon500

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p_davis

i understand Jon's 2nd point -- you have to make that unique but it is possible to get the index of the object in the list.

Maybe i am misunderstanding?

i put together a little project with the loading of a list of MyObject and then a little loop that grabs the index of each object in that list.

public partial class Form1 : Form
    {
        List<MyObject> oList = new List<MyObject>();

        public Form1()
        {
            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)
        {

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Random r = new Random(1);

            for (int i = 0; i <= 10; i++)
            {
                MyObject mo = new MyObject();
                mo.Id = r.Next(200);
                mo.Description = i.ToString();

                oList.Add(mo);
            }

            foreach (MyObject o in oList)
            {
                Int32 index = oList.IndexOf(o);
                //index now contains the index number of o in the oList.

            }
        }
    }

    public class MyObject
    {
        Int32 id;
        String description;

        public Int32 Id
        { get; set; }

        public string Description
        {
            get;
            set;
        }
    }

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Jon500

@p_Davis,

Perhaps I misunderstand your addition, but what the author was trying to do is obtain the index within the foreach iteration he provided in his example loop. Within that loop, as I had shown, there is not a way to get the index of oList to which o belongs. What I suggested he do, instead, was pretty much what you suggested.

Are we in agreement?

Cheers,
Jon

p_davis

i need this holiday break =)

it appears we are in agreement.

Jon500

:)

Have a happy, healthy one.

Cheers,
Jon500