23种设计模式加示例代码（C#实现），设计模式（Design Pattern）是一套被反复使用、多数人知晓的、经过分类的、代码设计经验的总结。
使用设计模式的目的：为了代码可重用性、让代码更容易被他人理解、保证代码可靠性。 设计模式使代码编写真正工程化；设计模式是软件工程的基石脉络，如同大厦的结构一样。(23 design patterns plus sample code (C# Implementation), Design Pattern is a set of repeated, most people aware, classified, code design experience summary.
The purpose of using design patterns: to code reusability, to make code easier for others to understand, and to ensure code reliability. Design patterns make code writing really engineering; design patterns are the bedrock of software engineering, just like the structure of a building)