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 = 0; 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); } }