C# - Simple List examples

What is a List?

A list is a collection of data.

Example

• Create a new list

//initialize an empty list for objects with type of INTEGER
List<int> numbers = new List<int>();

//initialize an empty list for objects with type of STRING
List<string> names = new List<string>();

//initialize a list with objects type of INTEGER
List<int> numbers = new List<int>() {1,2,3,4}; //List with 4 integer elements

//initialize a list with objects type of STRINGList<string> names = new List<string>() {"Dad","Mum","Child"}; //List with 3 string elements

• Add elements to a list

//add one element at the end 
numbers.Add(5);

//add a collection of new elements at the end
numbers.AddRange(new List<int>() { 6, 7, 8 });


//add one element at the end 
names.Add("Child2");

//add a collection of new elements at the end
names.AddRange(new List<string>() { "Child3", "Child4" });



//add one element at a defined position
numbers.Insert(8, 9);

//add one element at a defined position
names.Insert(6, "Child5");



//add a collection of new elements starting at a defined position
numbers.InsertRange(9, new List<int>() { 10, 11, 12 });

//add a collection of new elements starting at a defined position

names.InsertRange(7, new List<string>() { "Child6", "Child7" });

• Remove elements from a list

//remove the object with the value 8 from the list         
numbers.Remove(8);

//remove the opbject with the value Child from the list         
names.Remove("Child");

//remove object at position 3         
numbers.RemoveAt(3);

//remove 2 elements, starting at position 4         
numbers.RemoveRange(4, 2);