Check all strings in arraylist contains in other arraylist

Question

I trying make if Arraylist all values contains in other arraylist (all values)

Arraylist one:

Name
Item

ArrayList two:

Item
Name
Count

Note: the lists are shuffled

I tried this:

foreach (string str1 in arraylistone)
                            {
                                if (arraylisttwo.Contains(str1))
                                {
                                    //return true;
                                }
                            }

But it says true if contains someone element

Use List<string>. Don't use ArrayList unless you enjoy making your life harder... — user2819245
– user2819245, Commented Jan 23, 2019 at 19:21

Alex Leo · Accepted Answer · 2019-01-23 19:08:35Z

2

You could use Enumerable.Intersect.

        var listA = new List<string> { "Name", "Item" };
        var listB = new List<string> { "Name", "Item","Count" };

        var c = listA.Intersect(listB).ToList();

answered Jan 23, 2019 at 19:08

Alex Leo

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4 Comments

Slinidy Over a year ago

There is no method for Intersect

Alex Leo Over a year ago

you need the using System.Linq; statement

Slinidy Over a year ago

I added and not working my arraylist: public ArrayList arraylistone = new ArrayList();

Alex Leo Over a year ago

ArrayList doesn't have .Intersect method. What we are suggesting is to use a List<T> System.Collections.Generic;

JuanR · Accepted Answer · 2019-01-23 19:17:56Z

1

There are many ways to skin a cat. Here is one using Linq's Join extension method:

var list1 = new[] { "Name",  "Item" };
var list2 = new[] { "Item", "Name", "Count" };
var join = list1.Join(list2, l1 => l1, l2 => l2, (l1, l2) => new { l1, l2 });
var allContained = join.Count() == list1.Count();

Just be careful with comparison of strings. There is an overload that takes an IEqualityComparer<TKey> to allow you to define how the keys are compared.

Update:

As Alex Leo has pointed out, you can use Intersect:

 var allContained = list1.Intersect(list2).Count() == list1.Count();

Much simpler and it also provides an IEqualityComparer<T> overload.

edited Jan 23, 2019 at 19:17

answered Jan 23, 2019 at 19:09

JuanR

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4 Comments

Slinidy Over a year ago

How can I get Join from Linq?

JuanR Over a year ago

@Slinidy: Add a using statement at the top: using System.Linq;

Slinidy Over a year ago

I added and not working my arraylist: public ArrayList arraylistone = new ArrayList();

JuanR Over a year ago

You need to cast your ArrayList to an Array first: arraylistone.ToArray().

NaDeR Star · Accepted Answer · 2019-01-23 19:09:18Z

1

Try something like this

var arrayOne = new string[4];
    arrayOne[0] = "Item1";
    arrayOne[1] = "Item2";
    arrayOne[2] = "Item3";
    arrayOne[3] = "Item4";

var arrayTwo = new string[4];
    arrayTwo[0] = "Item1";
    arrayTwo[1] = "Item2";
    arrayTwo[2] = "Item3";
    arrayTwo[3] = "Item4";

    var allItemIsThere = true;

    foreach (var one in arrayOne)
    {
        allItemIsThere = arrayTwo.Contains(one);
        if(!allItemIsThere)
        { break;}
    }

answered Jan 23, 2019 at 19:09

NaDeR Star

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