C# does value exist in list

public int GetItemFromList() {
	List<Item> list = new List<Item>(
      new Item(1),
      new Item(2),
      new Item(3)
    );

	Item testItem = new Item(1);

	// Inside FindIndex() you can specify a lambda expression where you
	// query if an item exists like a boolean test.
	int index = list.FindIndex(item => testItem.Id == item.Id);

	// in this case out testItem.Id (1) is equal to an item in the list
	if (index > -1)
	{
		// We get here with the index 0!
      	return index;
	}
}

public class Item
{
	public int Id { get; set; }
	public Item() { }
	public Item(int id)
	{
		Id = id;
	}
}

Similar codes

6 votes110 views1 answer
How to generate entities from an existing database in entityframework core
C#
0 vote99 views1 answer
Force asp.net https
C#
1 vote102 views1 answer
Create new object from generic c#
C#
0 vote115 views1 answer
"??" in C#
C#
0 vote101 views1 answer
Linq get a dictionary key and value c#
C#
0 vote114 views1 answer
How to pass id from view to controller in asp.net core
C#
12 votes147 views2 answers
Move towards target unity
C#Unity
0 vote120 views1 answer
Which of the following string methods can be used to determine if a string contains only ‘\n’ characters?
C#
0 vote102 views2 answers
C# Math.Sqrt
C#
2 votes117 views1 answer
C# constructor call another constructor
C#