get index c#
int index = Array.IndexOf(arr,item);get both item and index in c#
// 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 of item in list C#
List<string> strings = new List<string>(){"bob","ate","an", "apple"};
strings.IndexOf("bob");
//returns 0
strings.IndexOf("an");
//returns 2
strings.IndexOf("apple");
//returns 3
strings.IndexOf("banana");
//returns -1
//Because banana is not in the list, IndexOf() returns -1c# 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!
}Copyright © 2021 Codeinu
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