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To remove duplicates from a C# list using Linq, do the following.
- Define a new list. Ours has 7 elements, with “2” and “4” repeating
- Use Distinct().ToList() to make a new list with the distinct elements
- Print out to the console
using System;
using System.Collections.Generic;
using System.Linq;
namespace Carl.RemoveDuplicatesList
{
class Program
{
static void Main(string[] args)
{
// Create list with non-unique values
List<string> l = new List<string>();
l.Add("1");
l.Add("2");
l.Add("2"); // duplicate
l.Add("3");
l.Add("4");
l.Add("4"); // duplicate
l.Add("5");
// Make new unique list
List<string> uniqueList = l.Distinct().ToList();
// Write to console
uniqueList.ForEach(i => Console.WriteLine($"{i}"));
Console.ReadLine();
}
}
}
This outputs:
Thank you for the very clear example of how to obtain a unique list. But what if you have a generic collection list? I have that and I am trying to obtain a unique list based on one field in that collection.