c# list remove duplicate items
List<string> lstWhitDuplicate = new list<string>();
lstWhitDuplicate.add("hallo");
lstWhitDuplicate.add("hallo");
lstWhitDuplicate.add("World");
List<string> lst = lstWhitDuplicate.Distinct().ToList();
// output lstWhitDuplicate:
// hallo hallo world
// output lst:
// hallo wordremove duplicated from object array c#
import System.Linq;
// for simple array
int[] nums = { 1, 2, 3, 4, 3, 55, 23, 2 };
int[] dist = nums.Distinct().ToArray();
// for object array/list
// example class to remove duplicates based on property
class Order{
public int i, j;
Order(int i, int j){
this.i = i;
this.j = j;
}
}
// create this class
class Comparer : IEqualityComparer<Connection> {
public bool Equals(Order x, Order y) {
return x.i == y.i; // based on variable i
}
public int GetHashCode(Order obj) {
return obj.i.GetHashCode(); // hashcode of variable to compare
}
}
// main
List<Order> list = new List<Order>();
list.Add(1, 2);
list.Add(2, 3);
list.Add(1, 4);
list.Add(4, 5);
list.Add(1, 6);
// duplicates removed
List<Order> rem_dup = list.Distinct(new Comparer()).ToList();
// List rem_dup has no duplicates based on property i of Order classc# list remove item based on property duplicate
fooArray.GroupBy(x => x.Id).Select(x => x.First());c# remove duplicates from list
List<T> withDupes = LoadSomeData();
List<T> noDupes = withDupes.Distinct().ToList();Copyright © 2021 Codeinu
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