为什么你写的代码改不动？
很多初学者写的 C# 程序能跑，但加个需求就牵一发而动全身。这门课解决的核心问题，就是把“能运行的代码”变成“可维护的软件”。它不教你基础语法，而是从 SOLID 原则切入，这是所有设计模式的基石。很多人背得下五大原则的名字，却分不清里氏替换和依赖倒置在实际编码中的区别。课程通过具体的 C# 代码示例，把这些抽象概念落地，让你明白为什么面向接口编程、为什么开闭原则才是扩展性的根本。
适合谁？先看哪几块？
适合有一定 C# 语法基础，但在实际项目中感到架构混乱、代码耦合度高的学习者。不需要你是架构师，但需要你能读懂类和接口。建议学习顺序：先花充足时间攻克“01 The SOLID Design Principles”部分，这是后续所有模式的理解前提。如果这五节没看懂，直接看 Builder 模式只会照搬写法而不懂意图。之后重点学习“02 Builder”，特别是 Fluent Builder 和 Faceted Builder 的实现，这是实际开发中构建复杂对象最常用的模式之一。配套的 .cs 文件不是文档，而是必须动手运行的代码，不要只看不练。
学完能做什么？
学完后，你能够识别现有代码中的设计缺陷，并运用单一职责、依赖倒置等原则进行重构。面对需要大量配置参数的对象创建场景，你能独立实现灵活的建造者模式，而不是堆砌构造函数重载。配套的资料包包含了关键章节的源码文本，建议边看视频边对照修改代码参数，观察运行结果变化。课程还配有 quiz，用来检验你是否真正理解了原则背后的权衡，而不是仅仅记住了定义。通过这套练习，你能建立起从“写代码”到“设计系统”的思维转变，为后续学习更复杂的设计模式打下坚实基础。
课程目录
00 None 001 Introduction.mp4 01 The SOLID Design Principles 002 Overview.mp4 003 Single Responsibility Principle.mp4 004 Open-Closed Principle.mp4 005 Liskov Substitution Principle.mp4 006 Interface Segregation Principle.mp4 007 Dependency Inversion Principle.mp4 008 Summary.mp4 attached_files 003 Single Responsibility Principle SOLID.SRP.cs.txt 004 Open-Closed Principle SOLID.OCP.cs.txt 005 Liskov Substitution Principle SOLID.LSP.cs.txt 006 Interface Segregation Principle SOLID.ISP.cs.txt 007 Dependency Inversion Principle SOLID.DIP.cs.txt 02 Builder 009 Overview.mp4 010 Life Without Builder.mp4 011 Builder.mp4 012 Fluent Builder.mp4 013 Faceted Builder.mp4 014 Summary.mp4 011 Builder Creational.Builder.Builder.cs.txt 013 Faceted Builder Creational.Builder.BuilderFacets.cs.txt quizzes 001 Builder Coding Exercise.html 03 Factories 015 Overview.mp4 016 Point Example.mp4 017 Factory Method.mp4 018 Factory.mp4 019 Inner Factory.mp4 020 Abstract Factory.mp4 021 Abstract Factory and OCP.mp4 022 Summary.mp4 016 Point Example Creational.Factories.Factory.cs.txt 020 Abstract Factory Creational.Factories.AbstractFactory.cs.txt 002 Factory Coding Exercise.html 04 Prototype 023 Overview.mp4 024 ICloneable is Bad.mp4 025 Copy Constructors.mp4 026 Explicit Deep Copy Interface.mp4 027 Copy Through Serialization.mp4 028 Summary.mp4 024 ICloneable is Bad Creational.Prototype.ICloneableIsBad.cs.txt 025 Copy Constructors Creational.Prototype.CopyConstructors.cs.txt 027 Copy Through Serialization Creational.Prototype.CopyThroughSerialization.cs.txt 003 Prototype Coding Exercise.html 05 Singleton 029 Overview.mp4 030 Singleton Implementation.mp4 031 Testability Issues.mp4 032 Singleton in Dependency Injection.mp4 033 Monostate.mp4 034 Summary.mp4 030 Singleton Implementation Creational.Singleton.Singleton.cs.txt 032 Singleton in Dependency Injection Creational.Singleton.SingletonInDI.cs.txt 033 Monostate Creational.Singleton.Monostate.cs.txt 004 Singleton Coding Exercise.html 06 Adapter 035 Overview.mp4 036 VectorRaster Demo.mp4 037 Adapter Caching.mp4 038 Summary.mp4 036 VectorRaster Demo Structural.Adapter.NoCaching.cs.txt 037 Adapter Caching Structural.Adapter.WithCaching.cs.txt 005 Adapter Coding Exercise.html 07 Bridge 039 Overview.mp4 040 Bridge.mp4 041 Summary.mp4 0OO_Softarchive - Download-More-Here.url 0OO_Software.For_Mac0S.txt 0OO_Windows.Office-AD0BE-Visual_Studio 2017.txt 040 Bridge Structural.Bridge.Bridge.cs.txt 006 Bridge Coding Exercise.html 08 Composite 042 Overview.mp4 043 Geometric Shapes.mp4 044 Neural Networks.mp4 045 Summary.mp4 043 Geometric Shapes Structural.Composite.GeometricShapes.cs.txt 044 Neural Networks Structural.Composite.NeuralNetworks.cs.txt 007 Composite Coding Exercise.html 09 Decorator 046 Overview.mp4 047 Custom String Builder.mp4 048 Adapter-Decorator.mp4 049 Multiple Inheritance.mp4 050 Dynamic Decorator Composition.mp4 051 Static Decorator Composition.mp4 052 Summary.mp4 047 Custom String Builder Structural.Decorator.CodeBuilder.cs.txt 048 Adapter-Decorator Structural.Decorator.AdapterDecorator.cs.txt 049 Multiple Inheritance Structural.Decorator.MultipleInheritance.cs.txt 050 Dynamic Decorator Composition Structural.Decorator.Decorator.cs.txt 008 Decorator Coding Exercise.html 10 Façade 053 Overview.mp4 054 Façade.mp4 055 Summary.mp4 11 Flyweight 056 Overview.mp4 057 Repeating User Names.mp4 058 Text Formatting.mp4 059 Summary.mp4 057 Repeating User Names Structural.Flyweight.Users.cs.txt 058 Text Formatting Structural.Flyweight.TextFormatting.cs.txt 009 Flyweight Coding Exercise.html 12 Proxy - Snorgared - SAnet.cd 060 Overview.mp4 061 Protection Proxy.mp4 062 Property Proxy.mp4 063 Dynamic Proxy for Logging.mp4 064 Proxy vs. Decorator.mp4 065 Summary.mp4 061 Protection Proxy Structural.Proxy.ProtectionProxy.cs.txt 062 Property Proxy PropertyProxy.cs.txt 063 Dynamic Proxy for Logging Structural.Proxy.DynamicProxy.cs.txt 010 Proxy Coding Exercise.html 13 Chain of Responsibility - Snorgared - SAnet.cd 066 Overview.mp4 067 Command Query Separation.mp4 068 Method Chain.mp4 069 Broker Chain.mp4 070 Summary.mp4 068 Method Chain Behavioral.ChainOfResponsibility.MethodChain.cs.txt 069 Broker Chain Behavioral.ChainOfResponsibility.BrokerChain.cs.txt 011 Chain of Responsibility Coding Exercise.html 14 Command 071 Overview.mp4 072 Command.mp4 073 Undo Operations.mp4 074 Summary.mp4 072 Command Behavioral.Command.Command.cs.txt 012 Command Coding Exercise.html 15 Interpreter 075 Overview.mp4 076 Handmade Interpreter Lexing.mp4 077 Handmade Interpreter Parsing.mp4 078 ANTLR.mp4 079 Summary.mp4 076 Handmade Interpreter Lexing Behavioral.Interpreter.Handmade.cs.txt 013 Interpreter Coding Exercise.html 16 Iterator 080 Overview.mp4 081 Iterator Object.mp4 082 Iterator Method.mp4 083 Iterators and Duck Typing.mp4 084 Array-Backed Properties.mp4 085 Summary.mp4 081 Iterator Object Behavioral.Iterator.TreeTraversal.cs.txt 084 Array-Backed Properties ArrayBackedProperties.cs.txt 014 Iterator Coding Exercise.html 17 Mediator 086 Overview.mp4 087 Chat Room.mp4 088 Event Broker.mp4 089 Summary.mp4 087 Chat Room Behavioral.Mediator.ChatRoom.cs.txt 088 Event Broker RxEventBroker.cs.txt 015 Mediator Coding Exercise.html 18 Memento 090 Overview.mp4 091 Memento.mp4 092 Undo and Redo.mp4 093 Memento for Interop.mp4 094 Summary.mp4 091 Memento Behavioral.Memento.Memento.cs.txt 092 Undo and Redo Behavioral.Memento.UndoRedo.cs.txt 19 Null Object 095 Overview.mp4 096 Null Object.mp4 097 Dynamic Null Object.mp4 098 Summary.mp4 096 Null Object Behavioral.NullObject.NullObject.cs.txt 20 Observer 099 Overview.mp4 100 Observer via the event Keyword.mp4 101 Weak Event Pattern.mp4 102 Observable Properties and Sequences.mp4 103 Summary.mp4 100 Observer via the event Keyword Behavioral.Observer.Events.cs.txt 101 Weak Event Pattern Behavioral.Observer.WeakEventPattern.cs.txt 102 Observable Properties and Sequences ObserverPattern.cs.txt 21 State 104 Overview.mp4 105 Handmade State Machine.mp4 106 State Machine with Stateless.mp4 107 Summary.mp4 105 Handmade State Machine Behavioral.State.Handmade.cs.txt 106 State Machine with Stateless Behavioral.State.Stateless.cs.txt 22 Strategy 108 Overview.mp4 109 Dynamic Strategy.mp4 110 Static Strategy.mp4 111 Summary.mp4 109 Dynamic Strategy Behavioral.Strategy.Dynamic.cs.txt 110 Static Strategy Behavioral.Strategy.Static.cs.txt 23 Template Method 112 Overview.mp4 113 Template Method.mp4 114 Summary.mp4 113 Template Method Behavioral.TemplateMethod.TemplateMethod.cs.txt 24 Visitor 115 Overview.mp4 116 Intrusive Expression Printing.mp4 117 Reflection-Based Printing.mp4 118 Classic Visitor Double Dispatch.mp4 119 Dynamic Visitor via the DLR.mp4 120 Summary.mp4 116 Intrusive Expression Printing Behavioral.Visitor.Intrusive.cs.txt 117 Reflection-Based Printing Behavioral.Visitor.Reflective.cs.txt 118 Classic Visitor Double Dispatch Behavioral.Visitor.Classic.cs.txt 119 Dynamic Visitor via the DLR Behavioral.Visitor.Dynamic.cs.txt 25 Course Summary 121 Creational Paterns Summary.mp4 122 Structural Patterns Summary.mp4 123 Behavioral Patterns Summary.mp4 124 End of Course.mp4 00 None│ 001 Introduction.mp4│ 01 The SOLID Design Principles│ │ 002 Overview.mp4│ │ 003 Single Responsibility Principle.mp4│
