23 kinds of design patterns in a simple plant source, there are several different ways.

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
............\......\................\...\OperationLibrary.csproj.FileListAbsolute.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
............\......\......\...\计算器.csproj.FileListAbsolute.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
............\......\............\...\计算器控制台.csproj.FileListAbsolute.txt
............\......\............\Program.cs
............\......\............\Properties
............\......\............\..........\AssemblyInfo.cs
............\......\............\计算器控制台.csproj

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