Solved

Need to compare two arrays of any primitive type for equality

Posted on 2014-10-16
2
127 Views
Last Modified: 2014-11-05
I need a method that will compare two arrays of any primitive type for the same contents.  Any order.
0
Comment
Question by:Bruce
2 Comments
 
LVL 33

Expert Comment

by:ste5an
ID: 40386149
Imho there is no way to tell, whether you have a sequential memory layout, thus you should stick to SequenceEqual.
0
 
LVL 34

Accepted Solution

by:
sarabande earned 500 total points
ID: 40386251
you may try

bool arraysAreEqual = (array1.Length == array2.Length) 
                     && new HashSet<T>(array1).SetEquals(array2);

Open in new window


in case the arrays haven't duplicate values.

if duplicates could happen use

SortedDictionary<T, int> dict1 = new SortedDictionary<T, int>();
SortedDictionary<T, int> dict2 = new SortedDictionary<T, int>();
foreach (t in array1) 
     dict1[t]++;  // count occurences
foreach (t in array2) 
     dict2[t]++; // count occurences
bool areArraysEqual = dict1.SequenceEqual(dict2);

Open in new window

or use a function like

static bool AreArraysEqual<T>(T[] array1, T[] array2)
{
    if (array1.Length != array2.Length)
        return false;
    Array.Sort(array1);
    Array.Sort(array2);

    EqualityComparer<T> comparer = EqualityComparer<T>.Default;
    for (int i = 0; i < array1.Length; i++)
    {
        if (!comparer.Equals(array1[i], array2[i])) return false;
    }
    return true;}

Open in new window


Sara
0

Featured Post

Secure Your Active Directory - April 20, 2017

Active Directory plays a critical role in your company’s IT infrastructure and keeping it secure in today’s hacker-infested world is a must.
Microsoft published 300+ pages of guidance, but who has the time, money, and resources to implement? Register now to find an easier way.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

This document covers how to connect to SQL Server and browse its contents.  It is meant for those new to Visual Studio and/or working with Microsoft SQL Server.  It is not a guide to building SQL Server database connections in your code.  This is mo…
Many of us here at EE write code. Many of us write exceptional code; just as many of us write exception-prone code. As we all should know, exceptions are a mechanism for handling errors which are typically out of our control. From database errors, t…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …
Are you ready to implement Active Directory best practices without reading 300+ pages? You're in luck. In this webinar hosted by Skyport Systems, you gain insight into Microsoft's latest comprehensive guide, with tips on the best and easiest way…

713 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question