建造者模式

要创建一个复杂对象

/// <summary>
/// 指挥者
/// </summary>
public class Director
{
    // 组装人
    public void Construct(Builder builder)
    {
        builder.BuildHead();
        builder.BuildBody();
        builder.BuildFoot();
    }
}
/// <summary>
/// 人
/// </summary>
public sealed class Person
{
    // 人部件集合
    private readonly IList<string> _parts = new List<string>();
    // 把单个部件添加到人部件集合中
    public void Add(string part)
    {
        _parts.Add(part);
    }
    public void Show()
    {
        Console.WriteLine("人开始在组装.......");
        foreach (var part in _parts)
        {
            Console.WriteLine("组件" + part + "已装好");
        }
        Console.WriteLine("人组装好了");
    }
}
/// <summary>
/// 抽象建造者
/// </summary>
public abstract class Builder
{
    // 创建头
    public abstract void BuildHead();
    // 创建身体
    public abstract void BuildBody();
    // 创建脚
    public abstract void BuildFoot();
    // 获得组装好的人
    public abstract Person GetPerson();
}
/// <summary>
/// 具体创建者，赛亚人
/// </summary>
public sealed class SaiyanBuilder : Builder
{
    readonly Person _buickCar = new Person();
    public override void BuildHead()
    {
        _buickCar.Add("Saiyan BuildHead");
    }
    public override void BuildBody()
    {
        _buickCar.Add("Saiyan BuildBody");
    }
    public override void BuildFoot()
    {
        _buickCar.Add("Saiyan BuildFoot");
    }
    public override Person GetPerson()
    {
        return _buickCar;
    }
}
/// <summary>
/// 具体创建者，那美克人
/// </summary>
public sealed class NaimBuilder : Builder
{
    readonly Person _buickCar = new Person();
    public override void BuildHead()
    {
        _buickCar.Add("Naim BuildHead");
    }
    public override void BuildBody()
    {
        _buickCar.Add("Naim BuildBody");
    }
    public override void BuildFoot()
    {
        _buickCar.Add("Naim BuildFoot");
    }
    public override Person GetPerson()
    {
        return _buickCar;
    }
}

调用：

var director = new Director();
var saiyanBuilder = new SaiyanBuilder();
var naimBuilder = new NaimBuilder();
director.Construct(saiyanBuilder);
// 组装赛亚人
var saiyanPerson = saiyanBuilder.GetPerson();
saiyanPerson.Show();
// 组装那美克人
director.Construct(naimBuilder);
var naimPerson = naimBuilder.GetPerson();
naimPerson.Show();

reference

C#设计模式之四建造者模式（Builder Pattern）【创建型】

C#设计模式(5)——建造者模式（Builder Pattern）