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C# Beyond Basics

bookStructs with Other Data Structures

Since structs are essentially data types, we can use them for creating Arrays and Lists as well:

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using System;
using System.Collections.Generic;

struct Student
{
    public string name;
    public int age;
}

class Program
{
    static void Main()
    {
        // An array of 50 students
        Student[] studentsArr = new Student[50];

        // A list of students
        List<Student> studentsList;
    }
}

In a List or an Array, we would access a Student object's field using the following syntax:

index.cs

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1

            
variableName[index].fieldName

For-example:

index.cs

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// Array
studentsArr[17].name = "Alex";

// List
studentsList[27].age = 21;

// Note: Both have the same syntax.

We can also loop through these arrays or lists to assign or access data. For-example the following code loops through a List of Students objects and calculates the average age:

index.cs

index.cs

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using System;
using System.Collections.Generic;

struct Student
{
    public string name;
    public int age;
}

class Program
{
    static void Main()
    {
        // Creating an array
        Student[] students = new Student[7];

        // Setting some data
        students[0].age = 18;
        students[1].age = 13;
        students[2].age = 16;
        students[3].age = 21;
        students[4].age = 30;
        students[5].age = 36;
        students[6].age = 20;

        int totalAge = 0;
        for (int i = 0; i < students.Length; i++)
        {
            totalAge += students[i].age;
        }

        // Formula for average is "sum of elements / number of elements"
        float averageAge = totalAge / students.Length;

        Console.WriteLine($"Average Age: {averageAge}");
    }
}

It is clear that here the Student struct acts like a data type. We can also use Student as a dictionary value as well. Following is an example of using Struct as a value in a dictionary:

index.cs

index.cs

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using System;
using System.Collections.Generic;

struct Student
{
    public string name;
    public int age;
}

class Program
{
    static void Main()
    {
        var studentsByID = new Dictionary<int, Student>();

        Student student;
        student.name = "Thomas";
        student.age = 36;

        studentsByID.Add(0, student);

        Console.WriteLine(studentsByID[0].name);
    }
}
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bookStructs with Other Data Structures

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Since structs are essentially data types, we can use them for creating Arrays and Lists as well:

index.cs

index.cs

copy

              
1234567891011121314151617181920

            
using System;
using System.Collections.Generic;

struct Student
{
    public string name;
    public int age;
}

class Program
{
    static void Main()
    {
        // An array of 50 students
        Student[] studentsArr = new Student[50];

        // A list of students
        List<Student> studentsList;
    }
}

In a List or an Array, we would access a Student object's field using the following syntax:

index.cs

index.cs

copy

              
1

            
variableName[index].fieldName

For-example:

index.cs

index.cs

copy

              
1234567

            
// Array
studentsArr[17].name = "Alex";

// List
studentsList[27].age = 21;

// Note: Both have the same syntax.

We can also loop through these arrays or lists to assign or access data. For-example the following code loops through a List of Students objects and calculates the average age:

index.cs

index.cs

copy

              
12345678910111213141516171819202122232425262728293031323334353637

            
using System;
using System.Collections.Generic;

struct Student
{
    public string name;
    public int age;
}

class Program
{
    static void Main()
    {
        // Creating an array
        Student[] students = new Student[7];

        // Setting some data
        students[0].age = 18;
        students[1].age = 13;
        students[2].age = 16;
        students[3].age = 21;
        students[4].age = 30;
        students[5].age = 36;
        students[6].age = 20;

        int totalAge = 0;
        for (int i = 0; i < students.Length; i++)
        {
            totalAge += students[i].age;
        }

        // Formula for average is "sum of elements / number of elements"
        float averageAge = totalAge / students.Length;

        Console.WriteLine($"Average Age: {averageAge}");
    }
}

It is clear that here the Student struct acts like a data type. We can also use Student as a dictionary value as well. Following is an example of using Struct as a value in a dictionary:

index.cs

index.cs

copy

              
123456789101112131415161718192021222324

            
using System;
using System.Collections.Generic;

struct Student
{
    public string name;
    public int age;
}

class Program
{
    static void Main()
    {
        var studentsByID = new Dictionary<int, Student>();

        Student student;
        student.name = "Thomas";
        student.age = 36;

        studentsByID.Add(0, student);

        Console.WriteLine(studentsByID[0].name);
    }
}
question mark

What is the correct syntax for accessing the score attribute of the 1st player?

Select the correct answer

Was alles duidelijk?

Hoe kunnen we het verbeteren?

Bedankt voor je feedback!

Sectie 2. Hoofdstuk 4
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