Unity list uses find or findall to find specific elements and the number of specific elements

In the development process , Sometimes it needs to be in List Find a specific element in , Now we can use List Of Find Method to implement , Examples are as follows ：
1. First we define a Student Class to simulate the class we need , Every student He has his student number （Number） And last name （LastName）.

public class student
{
    
	public int Number;
	public string LastName;
}

2. Create a script , Statement Students by List, And declare a few student stay List in .

private List<student> Students = new List<student>()
{
    
	new student(){
    Number = 01,LastName = "Li"},
	new student(){
    Number = 02,LastName = "Wang"},
	new student(){
    Number = 03,LastName = "Wang"},
}

3. When calling a method , Use Find To find the student number 1 Of student

student student01 = Students.Find(s=> s.Number == 01);
Debug.log(student01.LastName);

At this time, the printed result is “Li”, It shows that we have successfully used... In the list Find The element was found by looking up its attribute .

4. So next , We can use FindAll Search for LastName by “Wang” Number of students .

int Count = Students.FindAll(s=> s.LastName =="Wang").Count;
Debug.log(Count);

At this time, the printed result is “2”, It shows that we have successfully used... In the list FindAll Find out the number of elements with specific attributes .