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Question: c# get duplicates from list
Time: Asked 68 minute ago
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c# get duplicates from list

To get the duplicates from a list in C#, you can use LINQ (Language Integrated Query) to group the items by their value and then select only those groups that have more than one item. Here’s an example:

csharp

List<int> numbers = new List<int> { 1, 2, 3, 4, 2, 5, 6, 1 };

var duplicates = numbers

.GroupBy(x => x)

.Where(group => group.Count() > 1)

.Select(group => group.Key);

foreach (var duplicate in duplicates)
{
Console.WriteLine(duplicate);
}

In this example, we have a list of integers called numbers, and we want to find the duplicates. We use the GroupBy method to group the items by their value, and then we use the Where method to filter only those groups that have more than one item. Finally, we use the Select method to select only the keys (i.e., the values of the items) of the groups that meet the condition.

The output of this code will be:

1

2

because these are the values that appear more than once in the original list.

To get duplicates from a list, you can use a variety of methods depending on the programming language you are using. Here are a few examples:

Python:

These examples use different techniques to find duplicates, but they all involve iterating through the list and keeping track of values that appear more than once.

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