CODEWITHSUNDEEP
c#listoverriding
Essential
Essential

Reputation: 421

Is it possible to get an item's current index position in a list?

Is it possible to get an item's position in a list to do something like the following?…

public class ListItem
{
    public override string ToString()
    { return PositionInList.ToString(); }
}

public List < ListItem > myList = new List < ListItem >();

Upvotes: 1

Views: 196

Answers (3)

ragerory
ragerory

Reputation: 1376

using the .IndexOf() method of the List class will allow you to do that.

var lst = new List<string>();
lst.Add("foo");
lst.Add("bar");

// Output the index, ie: 1
Console.WriteLine(lst.IndexOf("bar"));

Upvotes: -1

BradleyDotNET
BradleyDotNET

Reputation: 61369

I'm not saying you should do this, because a class knowing about its container is just odd, but you could do:

List<ListItem> parentList;
public ListItem(List<ListItem> parentList)
{
    this.parentList = parentList;
}

public override string ToString()
    { return parentList.IndexOf(this).ToString(); }

Of course, during construction you need to pass the parent collection in.

Upvotes: 1

Selman Gen&#231;
Selman Gen&#231;

Reputation: 101701

There should be a connection between ListItem and List. For example you can add a property to store the list that has the ListItem:

public List<ListItem> List { get; set; }

public List <ListItem> myList = new List <ListItem>();
myList.Add(new ListItem { List = myList });

Then you can use IndexOf method:

public override string ToString()
{ 
    return List.IndexOf(this).ToString(); 
}

Upvotes: 1

Related Questions