How to address List<List<>> items using array [] operator

Question

Here is my problem: I have an object "Strip" and I need to have a list or array of these strips "stripList" and after that I need to have a list from different stripList that I called it "listOfStripList". I know that I can save the in this way:

List<List<Strip>> listOfStripList=new List<List<Strip>>();

the reason that I want to have this objects in this way is because in each time I want to have access to the each stripList without using For Loop. For example I want to say listOfStripList[1] and this related to the first list of strips.

Is there any way to define these list by Array?

I know that in MATLAB when we have a matrix like A(6,6) we can use A(1,:) and it means a column of that matrix. I am looking for some thing like this. — Fateme Shirmohammadi
– Fateme Shirmohammadi, Commented Feb 27, 2013 at 21:48
stackoverflow.com/questions/6705583/indexers-in-list-vs-array — Preet Sangha
– Preet Sangha, Commented Mar 7, 2013 at 20:51

ps2goat · Accepted Answer · 2015-01-16 22:20:18Z

0

listOfStripList[0] would give you a List<Strip> object. Calling listOfStripList[0][0] should give you the first item in the first list in listOfStripList

Here's a fiddle: https://dotnetfiddle.net/XdDggB

using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        List<List<Strip>> listOfStripLists = new List<List<Strip>>();

        for(int j = 65; j < 100; j++){

            List<Strip> stripList = new List<Strip>();

            for(int i = 0; i < 10; i++){
                stripList.Add(new Strip(){myval = ((char)j).ToString() + i.ToString()});
            }

            listOfStripLists.Add(stripList);
        }// end list of list

        Console.WriteLine(listOfStripLists[0][1].myval);
    }


    public class Strip
    {
        public string myval {get;set;}  
    }
}

answered Jan 16, 2015 at 22:20

ps2goat

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Comments

Cameron · Accepted Answer · 2015-01-16 22:21:22Z

0

List<T> and T[] both allow the use of an indexer (aka the [] operator). So you could just use your list like the following:

List<Strip> firstList = listOfStripList[0];

Although, if you must have it as an array, you could do something like this:

List<Strip>[] arrayOfListStrip = listOfStripList.ToArray();

edited Jan 16, 2015 at 22:21

answered Jan 16, 2015 at 22:12

Cameron

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2 Comments

Jeppe Stig Nielsen Over a year ago

Not exactly. T[] and List<T> both allow the syntax obj[index], yes, but for different reasons, and with no relation to the fact that they implement IEnumerable<T>.

Cameron Over a year ago

Ah.. That was just an assumption. I guess I should look stuff like that up. I'll edit.

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