Fields

Context: Fields are variables declared directly inside a class. They hold the state of an object.

Declaration

[access modifier] type fieldName;

Example

public class Order
{
    private int _id;
    public string CustomerName;
    protected double _totalAmount;
}

Field Initialization

Fields can be initialized at declaration or in the constructor.

public class Product
{
    private int _stock = 100;   // initialized
    private readonly string _sku; // must be set in constructor
    public Product(string sku) => _sku = sku;
}

Readonly Fields

readonly fields can only be set in the constructor or at declaration.

public class Config
{
    public readonly string AppName = "MyApp";
}

Accessing Fields

Use the dot operator.

Order order = new Order();
order.CustomerName = "Acme Inc.";