23种设计模式之建造者模式（Builder）

建造者模式强调将一个复杂对象的创建与它的表示分离，使得同样的构建过程可以创建不同的表示。建造者模式是一步一步地创建一个复杂的对象，它允许用户只通过制定复杂对象的类型和内容就可以构建它们，用户不需要知道内部的具体构建细节。建造者模式属于对象创建型模式。

public abstract class Builder
{
    public abstract void MakeTitle(string title);
    public abstract void MakeString(string str);
    public abstract void MakeItems(string[] items);
    public abstract Object GetResult();
}  

public class Director
{
    private Builder builder;  

    public Director(Builder builder)
    {
        this.builder = builder;
    }  

    public Object Construct()
    {
        builder.MakeTitle("Greeting");
        builder.MakeString("从早上到白天结束");
        builder.MakeItems(new string[] { "早安", "午安" });  

        builder.MakeString("到了晚上");
        builder.MakeItems(new string[] { "晚安", "好梦" });
        return builder.GetResult();
    }
}  

public class TextBuilder : Builder
{
    private StringBuilder sb = new StringBuilder();
    public override void MakeTitle(string title)
    {
        sb.Append("【" + title + "】/n/n");
    }  

    public override void MakeString(string str)
    {
        sb.Append(str + "/n/n");
    }  

    public override void MakeItems(string[] items)
    {
        for (int i = ; i < items.Length; i++)
        {
            sb.Append(items[i] + "/n");
        }
        sb.Append("/n");
    }  

    public override object GetResult()
    {
        return sb.ToString();
    }
}  

class Program
{
    static void Main(string[] args)
    {
        //生成器模式
        Builder.Director director = new Builder.Director(new Builder.TextBuilder());
        string result = director.Construct() as string;
        Console.WriteLine(result);
    }
}