Usage of C set

stay C# in , Sets are divided into generic sets and non generic sets , The interfaces and classes of non generic collections are in System.Collections In the namespace , The interfaces and classes of generic collections are System.Collections.Generic In the namespace .

ArrayList For dynamic list , Is a non generic linear list , You can add the data you need to manage to this list , Then a series of operations .

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class s1: MonoBehaviour {
    

	void Start () {
    
		ArrayList  list = new ArrayList();// Initialize the dynamic list object 
		list.Add("Jobs"); // Add string data to the list 
		list.Add("Linus");
		list.Add("Jensen");

		print(list[1]); //Linus
		print(list.IndexOf("Jobs") //0
		print(list.Count); // Number of elements in the print list ：3
		List.RemoveAt(1);// take Linus remove 
		print(list.Count);// Number of elements in the print list ：2
		print(list.Contains("Linus");// Determine if there is an element “Linus”, return false
		list.Clear();// Clear the list , The list is empty after clearing 

		void Update () {
    
		}
}

ArrayList Is a non generic interface , Each of its elements is defined as object type , This is why we can ArrayList Add any type of data to the object of , Because in C# in ,Everything is object. When we add... To the list int Type of data , Due to int Type conversion to object type , At this time, the packing operation occurs . In the code above , What we're adding is string Data of type , and string The type itself is a reference type , Therefore, although there is no aseng packing operation here , However, due to the type of installation and replacement , So there will still be problems of efficiency and security . therefore , It is not recommended that you use non generic collections , You should try to use generic collections to store data .