builder.md

Builder Pattern

The Builder pattern is used to separate the construction of a complex object from its representation. In .NET, the Builder pattern is implemented using a separate class or method that constructs the object step by step. This pattern is useful when you want to create complex objects that have many components, and you want to separate the construction logic from the representation.

public class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int Age { get; set; }
    public string Address { get; set; }
}

public class PersonBuilder
{
    private readonly Person person;

    public PersonBuilder()
    {
        person = new Person();
    }

    public PersonBuilder WithFirstName(string firstName)
    {
        person.FirstName = firstName;
        return this;
    }

    public PersonBuilder WithLastName(string lastName)
    {
        person.LastName = lastName;
        return this;
    }

    public PersonBuilder WithAge(int age)
    {
        person.Age = age;
        return this;
    }

    public PersonBuilder WithAddress(string address)
    {
        person.Address = address;
        return this;
    }

    public Person Build()
    {
        return person;
    }
}