This is a design pattern lying in the attached source code through the code can quickly learn some knowledge of design patterns useful

c#demo
......\01简单工厂模式
......\..............\计算器
......\..............\......\Operation
......\..............\......\.........\bin
......\..............\......\.........\...\Debug
......\..............\......\.........\obj
......\..............\......\.........\...\Debug
......\..............\......\.........\...\Operation.csproj.FileList.txt
......\..............\......\.........\Operation.cs
......\..............\......\.........\Operation.csproj
......\..............\......\.........\Properties
......\..............\......\.........\..........\AssemblyInfo.cs
......\..............\......\OperationLibrary
......\..............\......\................\bin
......\..............\......\................\...\Debug
......\..............\......\................\obj
......\..............\......\................\...\Debug
......\..............\......\................\...\OperationLibrary.csproj.FileList.txt
......\..............\......\................\Operation.cs
......\..............\......\................\OperationLibrary.csproj
......\..............\......\................\Properties
......\..............\......\................\..........\AssemblyInfo.cs
......\..............\......\计算器
......\..............\......\......\bin
......\..............\......\......\...\Debug
......\..............\......\......\ClassDiagram1.cd
......\..............\......\......\Form1.cs
......\..............\......\......\Form1.Designer.cs
......\..............\......\......\Form1.resx
......\..............\......\......\obj
......\..............\......\......\...\Debug
......\..............\......\......\...\计算器.csproj.FileList.txt
......\..............\......\......\Program.cs
......\..............\......\......\Properties
......\..............\......\......\..........\AssemblyInfo.cs
......\..............\......\......\..........\Resources.Designer.cs
......\..............\......\......\..........\Resources.resx
......\..............\......\......\..........\Settings.Designer.cs
......\..............\......\......\..........\Settings.settings
......\..............\......\......\计算器.csproj
......\..............\......\计算器.sln
......\..............\......\计算器控制台
......\..............\......\............\bin
......\..............\......\............\...\Debug
......\..............\......\............\obj
......\..............\......\............\...\Debug
......\..............\......\............\...\计算器控制台.csproj.FileList.txt
......\..............\......\............\Program.cs
......\..............\......\............\Properties
......\..............\......\............\..........\AssemblyInfo.cs
......\..............\......\............\计算器控制台.csproj
......\02策略模式
......\..........\策略模式-商场管理软件01简单计算
......\..........\...............................\商场管理软件
......\..........\...............................\............\bin
......\..........\...............................\............\...\Debug
......\..........\...............................\............\Form1.cs
......\..........\...............................\............\Form1.Designer.cs
......\..........\...............................\............\Form1.resx
......\..........\...............................\............\obj
......\..........\...............................\............\...\Debug
......\..........\...............................\............\...\商场管理软件.csproj.FileList.txt
......\..........\...............................\............\Program.cs
......\..........\...............................\............\Properties
......\..........\...............................\............\..........\AssemblyInfo.cs
......\..........\...............................\............\..........\Resources.Designer.cs
......\..........\...............................\............\..........\Resources.resx
......\..........\...............................\............\..........\Settings.Designer.cs
......\..........\...............................\............\..........\Settings.settings
......\..........\.........

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