It is the source code of design pattern, very nice!

bigtalkdesignpattensourcecode\01简单工厂模式
.............................\..............\计算器
.............................\..............\......\Operation
.............................\..............\......\.........\bin
.............................\..............\......\.........\...\Debug
.............................\..............\......\.........\...\.....\Operation.dll
.............................\..............\......\.........\obj
.............................\..............\......\.........\...\Debug
.............................\..............\......\.........\...\.....\Operation.dll
.............................\..............\......\.........\...\.....\TempPE
.............................\..............\......\.........\Operation.cs
.............................\..............\......\.........\Properties
.............................\..............\......\.........\..........\AssemblyInfo.cs
.............................\..............\......\OperationLibrary
.............................\..............\......\................\bin
.............................\..............\......\................\...\Debug
.............................\..............\......\................\...\.....\OperationLibrary.dll
.............................\..............\......\................\obj
.............................\..............\......\................\...\Debug
.............................\..............\......\................\...\.....\OperationLibrary.dll
.............................\..............\......\................\...\.....\Refactor
.............................\..............\......\................\...\.....\........\OperationLibrary.dll
.............................\..............\......\................\...\.....\TempPE
.............................\..............\......\................\Operation.cs
.............................\..............\......\................\Properties
.............................\..............\......\................\..........\AssemblyInfo.cs
.............................\..............\......\计算器.sln
.............................\..............\......\计算器.suo
.............................\..............\......\计算器
.............................\..............\......\......\bin
.............................\..............\......\......\...\Debug
.............................\..............\......\......\...\.....\OperationLibrary.dll
.............................\..............\......\......\ClassDiagram1.cd
.............................\..............\......\......\Form1.cs
.............................\..............\......\......\Form1.Designer.cs
.............................\..............\......\......\Form1.resx
.............................\..............\......\......\obj
.............................\..............\......\......\...\Debug
.............................\..............\......\......\...\.....\Refactor
.............................\..............\......\......\...\.....\ResolveAssemblyReference.cache
.............................\..............\......\......\...\.....\TempPE
.............................\..............\......\......\...\.....\......\Properties.Resources.Designer.cs.dll
.............................\..............\......\......\...\.....\计算器.csproj.GenerateResource.Cache
.............................\..............\......\......\...\.....\计算器.Form1.resources
.............................\..............\......\......\...\.....\计算器.Properties.Resources.resources
.............................\..............\......\......\Program.cs
.............................\..............\......\......\Properties
.............................\..............\......\......\..........\AssemblyInfo.cs
.............................\..............\......\......\..........\Resources.Designer.cs
.............................\..............\......\......\..........\Resources.resx
.............................\..............\......\......\..........\Settings.Designer.cs
.............................\..............\......\......\

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