Are familiar with software design patterns C# example, for the study design is a good source.

软件设计精要与模式代码
......................\Code without petshop
......................\....................\ch02
......................\....................\....\CommandPattern
......................\....................\....\..............\LogWriter
......................\....................\....\..............\LogWriter.ndoc
......................\....................\....\..............\LogWriter.sln
......................\....................\....\..............\LogWriter.suo
......................\....................\....\..............\.........\bin
......................\....................\....\..............\.........\...\Debug
......................\....................\....\..............\.........\ClassDiagram1.cd
......................\....................\....\..............\.........\Command
......................\....................\....\..............\.........\.......\DBLogWriter.cs
......................\....................\....\..............\.........\.......\TxtLogWriter.cs
......................\....................\....\..............\.........\.......\XmlLogWriter.cs
......................\....................\....\..............\.........\Interface
......................\....................\....\..............\.........\.........\ILogWriter.cs
......................\....................\....\..............\.........\Log.cs
......................\....................\....\..............\.........\LogWriter.csproj
......................\....................\....\..............\.........\obj
......................\....................\....\..............\.........\...\Debug
......................\....................\....\..............\.........\...\.....\Refactor
......................\....................\....\..............\.........\...\.....\TempPE
......................\....................\....\..............\.........\...\Logging.csproj.FileList.txt
......................\....................\....\..............\.........\...\LogWriter.csproj.FileList.txt
......................\....................\....\..............\.........\Properties
......................\....................\....\..............\.........\..........\AssemblyInfo.cs
......................\....................\....\..............\Log_Command.suo
......................\....................\....\FactoryPattern
......................\....................\....\..............\FactoryPattern.suo
......................\....................\....\..............\LogManager
......................\....................\....\..............\LogManager.sln
......................\....................\....\..............\LogManager.suo
......................\....................\....\..............\..........\bin
......................\....................\....\..............\..........\...\Debug
......................\....................\....\..............\..........\...\.....\DonOfDesign.FactoryPattern.LogManager.dll
......................\....................\....\..............\..........\...\.....\DonOfDesign.FactoryPattern.LogManager.pdb
......................\....................\....\..............\..........\Factory
......................\....................\....\..............\..........\.......\DBLogFactory.cs
......................\....................\....\..............\..........\.......\LogFactory.cs
......................\....................\....\..............\..........\.......\TxtLogFactory.cs
......................\....................\....\..............\..........\.......\XmlLogFactory.cs
......................\....................\....\..............\..........\LogManager.csproj
......................\....................\....\..............\..........\LogObject
......................\....................\....\..............\..........\.........\DBLog.cs
......................\....................\....\..............\..........\.........\Log.cs
......................\....................\....\..............\..........\.........\TxtLog.cs
......................\....................\....\..............

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