public class EmployeeBuilder
{
    private int id = 1;
    private string firstname = "first";
    private string lastname = "last";
    private DateTime birthdate = DateTime.Today;
    private string street = "street";

    public Employee Build()
    {
        return new Employee(id, firstname, lastname, birthdate, street);
    }

    public EmployeeBuilder WithFirstName(string firstname)
    {
        this.firstname = firstname;
        return this;
    }

    public EmployeeBuilder WithLastName(string lastname)
    {
        this.lastname = lastname;
        return this;
    }

    public EmployeeBuilder WithBirthDate(DateTime birthdate)
    {
        this.birthdate = birthdate;
        return this;
    }

    public EmployeeBuilder WithStreet(string street)
    {
        this.street = street;
        return this;
    }

    public static implicit operator Employee(EmployeeBuilder instance)
    {
        return instance.Build();
    }
}
 

測試

public class EmployeeTest
{

    [Test]
    public void GetFullNameReturnsCombination()
    {
        // Arrange
        Employee emp = new EmployeeBuilder().WithFirstName("Kenneth")
                                            .WithLastName("Truyers");

        // Act
        string fullname = emp.getFullName();

        // Assert
        Assert.That(fullname, Is.EqualTo("Kenneth Truyers"));
    }

    [Test]
    public void GetAgeReturnsCorrectValue()
    {
        // Arrange
        Employee emp = new EmployeeBuilder().WithBirthDate(new DateTime(1983, 1,1));

        // Act
        int age = emp.getAge();

        // Assert
        Assert.That(age, Is.EqualTo(DateTime.Today.Year - 1983));
    }
}
 

參考

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設計模式之Builder建造者模式 代碼初見