c# lists code example

Example 1: c# lists

// ------------------- How to initialize Lists? --------------------- //

using System.Collections.Generic   // You need to include this!

// 1º Method
var myList = new List();
//OR
List myList = new List();
  

// 2º Method
List myList = new List() {2, 5, 9, 12};


// 3º Method
string myString = "Hello"
List myList = new List(myString);  // Creates a list of characters from that string 
//OR
var myFirstList = new List() {9, 2, 4, 3, 2, 1};
var mySecondList = new List(myFirstList);   // Copy a list to a second list 




// -------- How to dynamically change the List of elements? --------- //

// Use the Add or Insert method to add one element
myList.Add(4);  

myList.Insert(0,3)  // Insert element "3" in position "0"
  

// Use the AddRange method to add many elements (you can use an array or
// list, for passing the values)
myList.AddRange(new int[3] {3, 5, 5, 9, 2}); 


// Use the Remove method to eliminate specific elements
for (int i = 0; i < myList.Count; i++)   // Use a for loop to remove 
{										// repeated elements
  if ( myList[i] == 5)
  {
  	myList.Remove(myList[i]);
    i--;
  }
}

// Use the Clear method to remove all elements from the list
myList.Clear();




// ---------------- How to create a List of Lists? ------------------ //

List> myList = new List>(){
	new List() {1,2,3},
	new List() {4,5,6},
	new List() {7,8,9}
};
		
Console.WriteLine(myList.ElementAt(0).ElementAt(1)); // You get "2"

Example 2: C# list

List myListOfStrings = new List 
{
	"this",
	"is",
	"my",
	"list"
};

Example 3: make a list c#

IList newList = new List(){1,2,3,4};

Example 4: to list c#

var arr = new int[] {1, 2, 3};
List list = arr.ToList();