Get a list of unrepeated possible values of a field using Linq

Question

I have a List of items of type DataItem (List<DataItem>):

public class DataItem
{
    public DataItem() { }

    public string Title { get; set; }

    public string Url { get; set; }

    public string Category { get; set; }
}

There may be many items with the same string in Category field.

How can I extract a list of different possible categories using Linq?

What I want as a result is a List<string> which has all the values found for Category property, but doesn't have repeated values.

Answer 1

You can use the Distinct method:

var result = itemsList.Select(n => n.Category).Distinct().ToList();

Answer 2

yourList.Select(item => item.Category).Distinct().ToList();