How to compare two generic list and remove duplicate from 2 list and save in third list

Question

1.00/5 (1 vote)

See more:

I am having 2 generic list i just need to compare both list and reomve duplicate from that and save that unduplicate value in third list

What I have tried:

I have tried linq query but it is giving me duplicate from both the list but i need which is not duplicate

Posted 3-Mar-16 23:41pm

Aviinash

Updated 4-Mar-16 4:18am

Add a Solution

Comments

[no name] 4-Mar-16 6:01am

Can you provide a demo what do you want exactly in third list..

Philippe Mori 4-Mar-16 8:29am

And also where is your code (query)? Do you really that us can read in you mind or do you expect us to access your computer by the web...

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Answer 1 · 2016-03-04T00:16:00

If I'm reading that right, you want the disjunction of the two lists - all of the items which are in one of the lists, but not in both.

There isn't a built-in LINQ method to do that, but it's fairly simple to implement:

C#

var disjunction = firstList.Except(secondList) // Items in the first list but not in the second
    .Concat(secondList.Except(firstList))      // Items in the second list but not in the first
    .ToList();

// Or:
var disjunction = new HashSet<YourType>(firstList);
disjunction.SymmetricExceptWith(secondList);

If your type doesn't implement IEquatable<T>[^], then you'll need to create a class which implements IEqualityComparer<T>[^], and pass an instance of that class as the second parameter to the Except method or the HashSet<T> constructor.

adriancs · Answer 2 · 2016-03-04T04:18:00

Solution 2

C#

foreach (var s in lst1)
{
    lst3.Add(s);
}

foreach (var s2 in lst2)
{
    bool existed = false;

    foreach (var s3 in lst3)
    {
        if (s2 == s3)
        {
            existed = true;
            break;
        }
    }

    if (!existed)
    {
        lst3.Add(s2);
    }
}

Posted 4-Mar-16 4:18am

adriancs