Unique values of the old list

Question

Unique values of the old list

Possible duplicate:
Remove list from list

I have 2 lists:

var oldList = new List<int>(){1,2,3,4,5};

var newList = new List<int>(){1,2,3,6,7};

How can I get the unique values of the old list (with LINQ)?

//hardcoded list:
var list =  new List<int>(){4,5};

//LINQ:
var list = ??

+3

list c # linq

Matthias Jan 31. 13 at 13:29

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5 answers

var list = oldList.Except(newList).ToList();

This means that it will return all items in oldList

that are not in newList

.

+2

Cédric bignon Jan 31. '13 at 13:30

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Do you mean values in oldList that are not in newList? If yes:

var list = oldList.Except(newList);

See Enumerable.Except on MSDN.

Add a challenge ToList()

if you really want a list.

+2

Daniel Kelley Jan 31. 13 at 13:31

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You can use the method Enumerable.Except()

.

Produces multiple differences between two sequences.

var oldList = new List<int>() { 1, 2, 3, 4, 5 };
var newList = new List<int>() { 1, 2, 3, 6, 7 };

var value = oldList.Except(newList);

foreach (var i in value)
{
    Console.WriteLine(i);
}

Here DEMO

.

+2

Soner Gönül Jan 31. 13 at 13:31

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You must use the method Except

.

var list = oldList.Except(newList);

Produces multiple differences between two sequences. [ Documentation ]

0

Ionică Bizău Jan 31. 13 at 13:32

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Massimiliano Peluso · Accepted Answer · 2013-01-31T13:30:38+0000

var unique = oldList.Except(newList);

http://msdn.microsoft.com/en-us/library/system.linq.enumerable.except.aspx

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Unique values of the old list