How to use list.find<> and list.findall<> in System.Collections.Generic

List.find<>

This will return first matched item from the list.

List. FindAll<>

This will return all matching items from the list.

Item Class Code

class Item

{

public int Amount;

public string Name;

}

List<Item> listItem = new List<Item>();

Item T1 = new Item() { Name = "A", Amount = 100 };

Item T2 = new Item() { Name = "B", Amount = 600 };

Item T3 = new Item() { Name = "C", Amount = 100 };

Item T4 = new Item() { Name = "D", Amount = 150 };

Item T5 = new Item() { Name = "E", Amount = 200 };

listItem.Add(T1);

listItem.Add(T2);

listItem.Add(T3);

listItem.Add(T4);

listItem.Add(T5);

Method 1

Item Result= listItem.Find(P=>P.Name=="A");

// item having "A" as it's item name

Item Result= listItem.Find(P=>(P.Name=="A" & P.Amount==100));

// item having "A" as it's item name and Amount as 100

Item Result= listItem.FindAll(P=>P.Amount==100);

//items having Amount as 100

Method 2

You can write your own function for searching.

private bool findItem(Item I) 

{

if (I.Name == "A")

{ return true; }

else 

{ returnfalse;}

}

Item Result= listItem.Find(findItem);