how to compare array in C#

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4.00/5 (1 vote)

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How to Compare Array

I have to Array

int [] n= new int [6] {1,2,3,4,5,6};

int [] m= new int [3] {1,5,6};

I want to compare both array and extracting non matching values .

how it is possible.

Thanks in Advance

Posted 15-Apr-15 21:42pm

Shrikesh_kale

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4 solutions

Solution 1

Check this similer discussion

comparing-two-arrays-in-c-sharp[^]

compare-two-arrays-or-arraylists-find-similar-and-different-values[^]

Hope it will help.

Posted 15-Apr-15 21:53pm

Black_Rose

Updated 15-Apr-15 22:04pm

v2

Comments

Shrikesh_kale 16-Apr-15 4:00am

how to get non matching element

Black_Rose 16-Apr-15 4:04am

Check the updated asnwer..

Solution 3

Use Enumerable.SequenceEqual method:

C#

int [] n = new int [6] {1,2,3,4,5,6};
int [] m = new int [3] {1,5,6};
bool result = n.SequenceEqual(m);

Posted 15-Apr-15 21:59pm

Paw Jershauge

Comments

Praveen Kumar Upadhyay 16-Apr-15 4:02am

But this is not returning non matching elements.

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Mario Z · Accepted Answer · 2015-04-15T22:08:00

Solution 4

Hi, well the easiest way that comes to my mind is to do it with a LINQ like this:

C#

int[] nonMatching = n.Except(m).Union(m.Except(n)).ToArray();

In short the n.Except(m) returns n array's items that are not found in m array, m.Except(n) does the vice versa and the Union will combine those two into a single collection.
Another way would be to just use a nested foreach and check each n array's item with each m array's item.

Posted 15-Apr-15 22:08pm

Mario Z

Comments

Afzaal Ahmad Zeeshan 16-Apr-15 4:10am

Correct, LINQ introduces a lot of functions easier to handle. +5

Mario Z 16-Apr-15 4:13am

True, it makes our life a lot easier that is for sure and code is a lot more readable.
Also thank you :)

Praveen Kumar Upadhyay 16-Apr-15 4:21am

+5. Nice

upendra shahi · Accepted Answer · 2015-04-15T21:57:00

Solution 2

Use Linq concept...

C#

bool hasDuplicate = false;
int[] a = new int[] {1,2,3,4,5,6 };
int[] b = new int[] { 1,5,6 };
foreach (var numberA in a)
{
    foreach (var numberB in b)
    {
        if (numberA == numberB)
        {
            hasDuplicate = true;
        }
    }
}

Posted 15-Apr-15 21:57pm

upendra shahi

Updated 15-Apr-15 21:59pm

v3

Comments

Shrikesh_kale 16-Apr-15 4:00am

how to Extracting non matching vaues

Praveen Kumar Upadhyay 16-Apr-15 4:03am

This is not Linq.

Afzaal Ahmad Zeeshan 16-Apr-15 4:10am

But LINQ concept; HasDuplicate.

Praveen Kumar Upadhyay 16-Apr-15 4:20am

Do you think, just by adding a variable named 'hasDuplicate' makes your code a Linq code?

Afzaal Ahmad Zeeshan 16-Apr-15 4:34am

No I am not saying it became LINQ code, it has same concept. Do you know the different between being actual and conceptual?

upendra shahi 16-Apr-15 4:40am

I'm just saying this is LINQ concept not as LINQ..