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‎CSharp.Tutorials.CodeRefactoring/CSharp.Tutorials.CodeRefactoring.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<StartupObject>Program</StartupObject>
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</PropertyGroup>
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<ItemGroup>
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<Folder Include="ExtractMethod\" />
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</ItemGroup>
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</Project>

‎CSharp.Tutorials.CodeRefactoring/CSharp.Tutorials.CodeRefactoring.sln

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.8.34525.116
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CSharp.Tutorials.CodeRefactoring", "CSharp.Tutorials.CodeRefactoring.csproj", "{FE8A0736-8BD4-4403-A553-35033970E525}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{FE8A0736-8BD4-4403-A553-35033970E525}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{FE8A0736-8BD4-4403-A553-35033970E525}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{FE8A0736-8BD4-4403-A553-35033970E525}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{FE8A0736-8BD4-4403-A553-35033970E525}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {FADC7234-E041-44CB-BBAA-6F1A2D074799}
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EndGlobalSection
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EndGlobal

‎CSharp.Tutorials.CodeRefactoring/DesignPatterns/FactoryPattern.cs

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using CSharp.Tutorials.CodeRefactoring.Samples;
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namespace CSharp.Tutorials.CodeRefactoring.DesignPatterns
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{
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class FactoryPattern
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{
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public static void Run()
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{
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ShapeFactory factory = new ShapeFactory();
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Console.WriteLine("Calculating areas by using Factory Pattern");
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ShapeBase rectangle = factory.CreateShape(ShapeType.Rectangle, 5, 10);
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Console.WriteLine("Area of rectangle: " + rectangle.CalculateArea());
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ShapeBase circle = factory.CreateShape(ShapeType.Circle, 7);
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Console.WriteLine("Area of circle: " + circle.CalculateArea());
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ShapeBase triangle = factory.CreateShape(ShapeType.Triangle, 3, 4, 5);
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Console.WriteLine("Area of triangle: " + triangle.CalculateArea());
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}
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class ShapeFactory
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{
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public ShapeBase CreateShape(ShapeType type, params double[] dimensions)
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{
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switch (type)
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{
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case ShapeType.Rectangle:
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if (dimensions.Length != 2)
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throw new ArgumentException("Invalid dimensions for rectangle.");
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return new Rectangle(dimensions[0], dimensions[1]);
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case ShapeType.Circle:
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if (dimensions.Length != 1)
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throw new ArgumentException("Invalid dimensions for circle.");
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return new Circle(dimensions[0]);
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case ShapeType.Triangle:
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if (dimensions.Length != 3)
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throw new ArgumentException("Invalid dimensions for triangle.");
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return new Triangle(dimensions[0], dimensions[1], dimensions[2]);
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default:
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throw new ArgumentException("Invalid shape specified.");
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}
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}
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}
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}
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}

‎CSharp.Tutorials.CodeRefactoring/DesignPatterns/StrategyPattern.cs

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using CSharp.Tutorials.CodeRefactoring.Samples;
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namespace CSharp.Tutorials.CodeRefactoring.DesignPatterns
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{
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class StrategyPattern
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{
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public static void Run()
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{
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Console.WriteLine("Calculating areas by using Strategy Pattern");
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Shape rectangle = new Shape(new RectangleAreaCalculator(), 5, 10);
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Console.WriteLine("Area of rectangle: " + rectangle.CalculateArea());
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Shape circle = new Shape(new CircleAreaCalculator(), 7);
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Console.WriteLine("Area of circle: " + circle.CalculateArea());
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Shape triangle = new Shape(new TriangleAreaCalculator(), 3, 4, 5);
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Console.WriteLine("Area of triangle: " + triangle.CalculateArea());
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}
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interface IAreaCalculator
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{
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double CalculateArea(params double[] dimensions);
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}
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class RectangleAreaCalculator : IAreaCalculator
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{
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public double CalculateArea(params double[] dimensions)
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{
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if (dimensions.Length != 2)
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throw new ArgumentException("Invalid dimensions for rectangle.");
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return dimensions[0] * dimensions[1];
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}
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}
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class CircleAreaCalculator : IAreaCalculator
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{
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public double CalculateArea(params double[] dimensions)
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{
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if (dimensions.Length != 1)
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throw new ArgumentException("Invalid dimensions for circle.");
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return Math.PI * dimensions[0] * dimensions[0];
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}
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}
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class TriangleAreaCalculator : IAreaCalculator
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{
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public double CalculateArea(params double[] dimensions)
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{
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if (dimensions.Length != 3)
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throw new ArgumentException("Invalid dimensions for triangle.");
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double s = (dimensions[0] + dimensions[1] + dimensions[2]) / 2;
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return Math.Sqrt(s * (s - dimensions[0]) * (s - dimensions[1]) * (s - dimensions[2]));
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}
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}
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class Shape : ShapeBase
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{
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private readonly IAreaCalculator _areaCalculator;
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private readonly double[] _dimensions;
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public Shape(IAreaCalculator areaCalculator, params double[] dimensions)
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{
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_areaCalculator = areaCalculator;
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_dimensions = dimensions;
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}
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public override double CalculateArea()
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{
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return _areaCalculator.CalculateArea(_dimensions);
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}
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}
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}
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}

‎CSharp.Tutorials.CodeRefactoring/EliminateCodeDuplication.cs

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namespace CSharp.Tutorials.CodeRefactoring
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{
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class EliminateCodeDuplication
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{
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public static void Run()
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{
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Console.WriteLine("Calculating areas by single method...");
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// Calculate the area of a rectangle
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double rectangleArea = CalculateArea(ShapeType.Rectangle, 5, 10);
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Console.WriteLine("Area of rectangle: " + rectangleArea);
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// Calculate the area of a circle
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double circleArea = CalculateArea(ShapeType.Circle, 7);
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Console.WriteLine("Area of circle: " + circleArea);
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// Calculate the area of a triangle
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double triangleArea = CalculateArea(ShapeType.Triangle, 3, 4, 5);
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Console.WriteLine("Area of triangle: " + triangleArea);
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}
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// Method to calculate the area of various shapes
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static double CalculateArea(ShapeType shape, params double[] dimensions)
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{
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switch (shape)
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{
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case ShapeType.Rectangle:
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return dimensions[0] * dimensions[1];
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case ShapeType.Circle:
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return Math.PI * dimensions[0] * dimensions[0];
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case ShapeType.Triangle:
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double s = (dimensions[0] + dimensions[1] + dimensions[2]) / 2;
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return Math.Sqrt(s * (s - dimensions[0]) * (s - dimensions[1]) * (s - dimensions[2]));
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default:
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throw new ArgumentException("Invalid shape specified");
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}
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}
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}
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}

‎CSharp.Tutorials.CodeRefactoring/ExtractMethod.cs

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using CSharp.Tutorials.CodeRefactoring.Samples;
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namespace CSharp.Tutorials.CodeRefactoring
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{
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class ExtractMethod
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{
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// After refactoring
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public static void ProcessOrder(Order order)
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{
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Console.WriteLine("Processing order by using seperated methods...");
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ValidateOrder(order);
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UpdateInventory(order);
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CalculateTotalPrice(order);
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NotifyCustomer(order);
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}
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static void ValidateOrder(Order order)
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{
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if (!order.IsValid)
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{
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throw new ArgumentException("Invalid order.");
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}
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}
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static void UpdateInventory(Order order)
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{
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foreach (var product in order.Products)
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{
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// Reduce inventory by 1 for each ordered product
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int updatedQuantity = product.AvailableQuantity - 1;
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// Ensure the updated quantity is non-negative
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updatedQuantity = Math.Max(updatedQuantity, 0);
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// Update the product's available quantity
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product.AvailableQuantity = updatedQuantity;
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// Print a message to simulate inventory update
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Console.WriteLine($"Inventory updated for product '{product.Name}': Available Quantity = {product.AvailableQuantity}");
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}
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}
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static void CalculateTotalPrice(Order order)
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{
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double totalPrice = order.Products.Sum(p => p.Price);
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totalPrice -= CalculateDiscount(order);
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Console.WriteLine($"Order Total: {totalPrice}");
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}
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static double CalculateDiscount(Order order)
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{
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double discount = 0;
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double totalPrice = order.Products.Sum(p => p.Price);
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// Check if the customer is a preferred customer and apply a discount if eligible
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if (order.Customer.IsPreferredCustomer)
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{
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// Apply a 10% discount for preferred customers
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discount = totalPrice * 0.1;
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}
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// Check if the order total exceeds a certain threshold and apply additional discount
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if (totalPrice >= 1000)
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{
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// Apply a $50 discount for orders totaling $1000 or more
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discount += 50;
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}
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else if (totalPrice >= 500)
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{
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// Apply a $20 discount for orders totaling $500 or more
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discount += 20;
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}
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// Ensure the discount does not exceed the order total
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discount = Math.Min(discount, totalPrice);
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return discount;
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}
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static void NotifyCustomer(Order order)
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{
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string shippingLabel = GenerateShippingLabel(order.Customer, order.Address);
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Console.WriteLine($"Sending notification to customer {order.Customer.Name}: Your order has been shipped. Shipping label: {shippingLabel}");
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}
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static string GenerateShippingLabel(Customer customer, Address address)
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{
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return $"Shipping label for {customer.Name} at {address.Street}, {address.City}, {address.ZipCode}";
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}
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}
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}

‎CSharp.Tutorials.CodeRefactoring/Program.cs

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using CSharp.Tutorials.CodeRefactoring;
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using CSharp.Tutorials.CodeRefactoring.DesignPatterns;
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using CSharp.Tutorials.CodeRefactoring.Samples;
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using ExtractMethod = CSharp.Tutorials.CodeRefactoring.ExtractMethod;
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class Program
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{
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static void Main(string[] args)
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{
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ProcessOrder();
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CalculateAreas();
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}
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static void ProcessOrder()
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{
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var order = OrderService.GetOrder();
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OrderService.ProcessOrder(order);
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ExtractMethod.ProcessOrder(order);
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}
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static void CalculateAreas()
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{
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ShapeService.CalculateAreas();
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EliminateCodeDuplication.Run();
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UseOOP.Run();
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FactoryPattern.Run();
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StrategyPattern.Run();
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}
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}
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‎CSharp.Tutorials.CodeRefactoring/Samples/Address.cs

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namespace CSharp.Tutorials.CodeRefactoring.Samples
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{
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public class Address
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{
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public string Street { get; set; }
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public string City { get; set; }
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public string ZipCode { get; set; }
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}
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}

‎CSharp.Tutorials.CodeRefactoring/Samples/Circle.cs

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namespace CSharp.Tutorials.CodeRefactoring.Samples
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{
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class Circle : ShapeBase
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{
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private double Radius { get; }
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public Circle(double radius)
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{
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Radius = radius;
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}
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public override double CalculateArea()
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{
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return Math.PI * Radius * Radius;
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}
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}
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}

‎CSharp.Tutorials.CodeRefactoring/Samples/Customer.cs

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namespace CSharp.Tutorials.CodeRefactoring.Samples
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{
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public class Customer
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{
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public string Name { get; set; }
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public bool IsPreferredCustomer { get; set; }
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}
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}

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