Find repetitive in list

Question

I have an list of person same as below:

List<Person> Persons=New List<Person>

Person class contains some property such as Id,Firstname,LastName,Age,... in this list exist some repetitive object with same Firstname and LastName

how can i recognize and find repetitive objects Id?

you mean firstname = lastname) or (firstname = firstname and lastname = lastnam)? — ssilas777, Mar 06 '13 at 17:56

score 1 · Accepted Answer · answered Mar 06 '13 at 17:55

1

From Eric White's blog:

int[] listOfItems = new[] { 4, 2, 3, 1, 6, 4, 3 };
var duplicates = listOfItems
    .GroupBy(i => i)
    .Where(g => g.Count() > 1)
    .Select(g => g.Key);
foreach (var d in duplicates)
    Console.WriteLine(d);

answered Mar 06 '13 at 17:55

Jordan Parmer

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I want to find exactly my repetitive object position in list! not group by result. – Morteza Nemati Mar 07 '13 at 05:42

score 0 · Answer 2 · edited Mar 15 '13 at 13:39

0

If I recall correctly, this should create a unique list if this is what you're after:

List<String> list2 = new ArrayList<String>(new HashSet<String>(list1));

edited Mar 15 '13 at 13:39

answered Mar 06 '13 at 17:56

Harlin

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Find repetitive in list

2 Answers2