Working with the List<T> class in C#

The generic List<T> class is one of the most frequently used generic classes when working with collections in C#. You can use this class to create a collection of any type of object you want. One of the advantages of using the List<T> class is that it can behave both like a list and an array. You can access the records from this list by using the index of the records like you do with arrays.

Example

Suppose you have a class Student with the following data members

class Student  {      public int RollNo;      public string Name;      public String EmailId;  }

If you wish to create a list of students in C# then you will be using the List<T> class in the following manner

List<Student> students = new List<Student>();

By writing this line you have created an empty list of students. To add a new item to the list we use the Add function. For example in the code below we are creating a new object of the Student class and adding it to the students list

// Create a new student object  Student student = new Student();  Student.RollNo = 1;  Student.Name = “Ravinder”;  Student.EmailId = "ravinder@somesite.com";    // Add the student to the list  Students.Add(student);

Similarly you can add any number of student objects to this list.

Counting the items in the list

The List<T> class has a Count property using which you can get the total number of items in the list. Look at the code below

int studentsCount = students.Count;

There are many other useful functions in the List<T> class which we will be discussing after discussing about Dictionary and Stack classes

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