csharp list any retun indec
Code Example - csharp list any retun indec
public class Item {
public int Id { get; set; }
public Item() {}
public Item(int id) { Id = id; }
}
List<Item> idList = { new Item(1), new Item(2), new Item(3) };
Item[] idLArr = [ new Item(1), new Item(2), new Item(3) ];
Item newItem = new Item(1);
// Using a lambda expression we can do the following query
int index = idList.FindIndex(item => item.Id == newItem.Id);
int arrIndex = Array.IndexOf(idLArr, newItem.Id);
//Then use it like so:
if (index != -1)
{
// The item exists at index 0!
}
csharp list index
// Get the first item from the list
using System.Linq;
var myList = new List<string>{ "Yes", "No", "Maybe"};
var firstItem = myList.ElementAt(0);
// Do something with firstItem
get both item and index in csharp
// add this to your namespace
public static IEnumerable<(T item, int index)> WithIndex<T>(this IEnumerable<T> source)
{
return source.Select((item, index) => (item, index));
}
//do something like this
foreach (var (item, index) in collection.WithIndex())
{
DoSomething(item, index);
}
index list csharp
list1[0];