c# verify in class exist in list
Item wonderIfItsPresent = ...
bool containsItem = myList.Any(item => item.UniqueProperty == wonderIfItsPresent.UniqueProperty);'c# verify in class exist in list
Item wonderIfItsPresent = ...
bool containsItem = myList.Any(item => item.UniqueProperty == wonderIfItsPresent.UniqueProperty);'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;
}
}c# object is in object list
public class A { public int Id {get;set;} public A() {} public A(int id) {Id = id;}}
List<A> list = new List<A>() { new A() { Id = 1}, new A() { Id = 2}};
bool containsItem = list.Any(item => item.Id == 3);
// this would return false.Copyright © 2021 Codeinu
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