├── .gitattributes ├── .gitignore ├── README.md ├── StrategyPattern.sln └── StrategyPattern ├── CustomerDiscount ├── CustomerDiscountContext.cs ├── HighDiscountStrategy.cs ├── IDiscountStrategy.cs ├── LowDiscountStrategy.cs ├── MediumDiscountStrategy.cs └── NoDiscountStrategy.cs ├── Program.cs ├── StrategyPattern.csproj └── Vehicle ├── FloatBehavior.cs ├── FlyBehavior.cs ├── InitialBehavior.cs ├── Vehicle.cs └── VehicleBehavior.cs /.gitattributes: -------------------------------------------------------------------------------- 1 | ############################################################################### 2 | # Set default behavior to automatically normalize line endings. 3 | ############################################################################### 4 | * text=auto 5 | 6 | ############################################################################### 7 | # Set default behavior for command prompt diff. 8 | # 9 | # This is need for earlier builds of msysgit that does not have it on by 10 | # default for csharp files. 11 | # Note: This is only used by command line 12 | ############################################################################### 13 | #*.cs diff=csharp 14 | 15 | ############################################################################### 16 | # Set the merge driver for project and solution files 17 | # 18 | # Merging from the command prompt will add diff markers to the files if there 19 | # are conflicts (Merging from VS is not affected by the settings below, in VS 20 | # the diff markers are never inserted). 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It defines a family of algorithms, encapsulates each one of them, and makes them interchangeable. By using the Strategy Pattern, the algorithm can vary independently from the client that uses it. 8 | A client can select an algorithm from a set of algorithms dynamically at runtime. This 9 | pattern also provides a simple way to use the selected algorithm. 10 | You know that an object can have states and behaviors. And some of these behaviors 11 | may vary among the objects of a class. This pattern focuses on the changing behaviors 12 | that can be associated with an object at a specific time. 13 | 14 | In this example, we demonstrate the Strategy Pattern by implementing a discount system for a customer based on their total sales amount. The discount strategies vary based on predefined thresholds of total sales amounts. 15 | 16 | ## Implementation 17 | 18 | - `IDiscountStrategy`: Interface defining the strategy for applying discounts. 19 | - `NoDiscountStrategy`, `LowDiscountStrategy`, `MediumDiscountStrategy`, `HighDiscountStrategy`: Concrete implementations of the discount strategies. 20 | - `CustomerDiscountContext`: Context class that uses the selected discount strategy to apply discounts based on the total sales amount. 21 | - `Program.cs`: Main program demonstrating how to use the Strategy Pattern to apply discounts. 22 | 23 | ## Connect with Me 24 | 25 | [![LinkedIn](https://img.shields.io/badge/LinkedIn-Profile-blue)](https://www.linkedin.com/in/spyros-ponaris-913a6937/) 26 | 27 | ## How to Use 28 | 29 | # 1. Clone the repository: 30 | 31 | ```bash 32 | # git clone https://github.com/stevsharp/StrategyPattern.git 33 | 34 | # 2 .Open the solution in your preferred C# IDE. 35 | Run the program and observe the output, which demonstrates different discount strategies applied based on the total sales amount. 36 | Contributing 37 | Contributions are welcome! If you find any issues or have suggestions for improvements, feel free to open an issue or create a pull request. 38 | 39 | # License 40 | This project is licensed under the MIT License - see the LICENSE file for details. 41 | 42 | -------------------------------------------------------------------------------- /StrategyPattern.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio Version 17 4 | VisualStudioVersion = 17.9.34728.123 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StrategyPattern", "StrategyPattern\StrategyPattern.csproj", "{2FD478A3-E175-4C5B-A5F1-3FE10845C1F5}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|Any CPU = Debug|Any CPU 11 | Release|Any CPU = Release|Any CPU 12 | EndGlobalSection 13 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 14 | {2FD478A3-E175-4C5B-A5F1-3FE10845C1F5}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 15 | {2FD478A3-E175-4C5B-A5F1-3FE10845C1F5}.Debug|Any CPU.Build.0 = Debug|Any CPU 16 | {2FD478A3-E175-4C5B-A5F1-3FE10845C1F5}.Release|Any CPU.ActiveCfg = Release|Any CPU 17 | {2FD478A3-E175-4C5B-A5F1-3FE10845C1F5}.Release|Any CPU.Build.0 = Release|Any CPU 18 | EndGlobalSection 19 | GlobalSection(SolutionProperties) = preSolution 20 | HideSolutionNode = FALSE 21 | EndGlobalSection 22 | GlobalSection(ExtensibilityGlobals) = postSolution 23 | SolutionGuid = {F9A2DE71-FE20-4088-AE87-22192F556DFC} 24 | EndGlobalSection 25 | EndGlobal 26 | -------------------------------------------------------------------------------- /StrategyPattern/CustomerDiscount/CustomerDiscountContext.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPattern.CustomerDiscount 2 | { 3 | public class CustomerDiscountContext 4 | { 5 | private IDiscountStrategy discountStrategy; 6 | 7 | public CustomerDiscountContext(Func strategyFunc, int totalSalesAmount) 8 | { 9 | discountStrategy = strategyFunc(totalSalesAmount); 10 | } 11 | 12 | public void ProcessDiscount() 13 | { 14 | discountStrategy.ApplyDiscount(); 15 | } 16 | } 17 | 18 | } 19 | -------------------------------------------------------------------------------- /StrategyPattern/CustomerDiscount/HighDiscountStrategy.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPattern.CustomerDiscount 2 | { 3 | public class HighDiscountStrategy : IDiscountStrategy 4 | { 5 | 6 | 7 | public HighDiscountStrategy(decimal totalSalesAmount) 8 | { 9 | TotalSalesAmount = totalSalesAmount; 10 | } 11 | 12 | public decimal TotalSalesAmount { get; } 13 | 14 | public void ApplyDiscount() 15 | { 16 | Console.WriteLine($"Applying High Discount. {TotalSalesAmount}"); 17 | } 18 | } 19 | } 20 | -------------------------------------------------------------------------------- /StrategyPattern/CustomerDiscount/IDiscountStrategy.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPattern.CustomerDiscount 2 | { 3 | public interface IDiscountStrategy 4 | { 5 | void ApplyDiscount(); 6 | } 7 | } 8 | -------------------------------------------------------------------------------- /StrategyPattern/CustomerDiscount/LowDiscountStrategy.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPattern.CustomerDiscount 2 | { 3 | public class LowDiscountStrategy : IDiscountStrategy 4 | { 5 | public LowDiscountStrategy(decimal totalSalesAmount) 6 | { 7 | TotalSalesAmount = totalSalesAmount; 8 | } 9 | 10 | public decimal TotalSalesAmount { get; } 11 | 12 | public void ApplyDiscount() 13 | { 14 | Console.WriteLine("Applying High Discount."); 15 | } 16 | } 17 | } 18 | -------------------------------------------------------------------------------- /StrategyPattern/CustomerDiscount/MediumDiscountStrategy.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPattern.CustomerDiscount 2 | { 3 | public class MediumDiscountStrategy : IDiscountStrategy 4 | { 5 | public MediumDiscountStrategy(decimal totalSalesAmount) 6 | { 7 | TotalSalesAmount = totalSalesAmount; 8 | } 9 | 10 | public decimal TotalSalesAmount { get; } 11 | public void ApplyDiscount() 12 | { 13 | Console.WriteLine("Applying Medium Discount."); 14 | } 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /StrategyPattern/CustomerDiscount/NoDiscountStrategy.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPattern.CustomerDiscount 2 | { 3 | // Define concrete discount strategies 4 | public class NoDiscountStrategy : IDiscountStrategy 5 | { 6 | public void ApplyDiscount() 7 | { 8 | Console.WriteLine("No discount applied."); 9 | } 10 | } 11 | } 12 | -------------------------------------------------------------------------------- /StrategyPattern/Program.cs: -------------------------------------------------------------------------------- 1 |  2 | using StrategyPattern.CustomerDiscount; 3 | using StrategyPattern.Vehicle; 4 | 5 | try 6 | { 7 | int totalSalesAmount = 6000; 8 | 9 | Func discountStrategy = (totalSalesAmount) => 10 | { 11 | if (totalSalesAmount >= 5000) 12 | { 13 | return new HighDiscountStrategy(totalSalesAmount); 14 | } 15 | else if (totalSalesAmount >= 3000) 16 | { 17 | return new MediumDiscountStrategy(totalSalesAmount); 18 | } 19 | else if (totalSalesAmount >= 1000) 20 | { 21 | return new LowDiscountStrategy(totalSalesAmount); 22 | } 23 | else 24 | { 25 | return new NoDiscountStrategy(); 26 | } 27 | }; 28 | 29 | 30 | var customerDiscountContext = new CustomerDiscountContext(discountStrategy, totalSalesAmount); 31 | 32 | // Process discount 33 | customerDiscountContext.ProcessDiscount(); 34 | 35 | Console.WriteLine("***Strategy Pattern Demo.***\n"); 36 | 37 | Vehicle context = new Vehicle("Aeroplane"); 38 | context.DisplayAboutMe(); 39 | 40 | Console.WriteLine("Setting flying capability to vehicle."); 41 | context.SetVehicleBehavior(new FlyBehavior()); 42 | context.DisplayAboutMe(); 43 | 44 | Console.WriteLine("Changing the vehicle behavior again."); 45 | context.SetVehicleBehavior(new FloatBehavior()); 46 | context.DisplayAboutMe(); 47 | 48 | 49 | } 50 | catch (Exception ex) 51 | { 52 | Console.WriteLine(ex.ToString()); 53 | } 54 | 55 | Console.ReadLine(); -------------------------------------------------------------------------------- /StrategyPattern/StrategyPattern.csproj: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | Exe 5 | net8.0 6 | enable 7 | enable 8 | 9 | 10 | 11 | -------------------------------------------------------------------------------- /StrategyPattern/Vehicle/FloatBehavior.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPattern.Vehicle 2 | { 3 | class FloatBehavior : VehicleBehavior 4 | { 5 | public override void AboutMe(string vehicle) 6 | { 7 | Console.WriteLine($"My {vehicle} can float now."); 8 | } 9 | } 10 | } 11 | -------------------------------------------------------------------------------- /StrategyPattern/Vehicle/FlyBehavior.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPattern.Vehicle 2 | { 3 | class FlyBehavior : VehicleBehavior 4 | { 5 | public override void AboutMe(string vehicle) 6 | { 7 | Console.WriteLine($"My {vehicle} can fly now."); 8 | } 9 | } 10 | } 11 | -------------------------------------------------------------------------------- /StrategyPattern/Vehicle/InitialBehavior.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPattern.Vehicle 2 | { 3 | class InitialBehavior : VehicleBehavior 4 | { 5 | public override void AboutMe(string vehicle) 6 | { 7 | Console.WriteLine($"My {vehicle} is just born.It cannot do anything special."); 8 | } 9 | } 10 | } 11 | -------------------------------------------------------------------------------- /StrategyPattern/Vehicle/Vehicle.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPattern.Vehicle 2 | { 3 | public class Vehicle : VehicleBehavior 4 | { 5 | VehicleBehavior behavior; 6 | string vehicleType; 7 | 8 | public Vehicle(string vehicleType) 9 | { 10 | this.vehicleType = vehicleType; 11 | //Setting the initial behavior 12 | behavior = new InitialBehavior(); 13 | } 14 | 15 | public void SetVehicleBehavior(VehicleBehavior behavior) 16 | { 17 | this.behavior = behavior; 18 | } 19 | 20 | public void DisplayAboutMe() 21 | { 22 | behavior.AboutMe(vehicleType); 23 | } 24 | 25 | public override void AboutMe(string vehicle) 26 | { 27 | Console.WriteLine($"My {vehicle} is just born.It cannot do anything special."); 28 | } 29 | 30 | } 31 | } 32 | -------------------------------------------------------------------------------- /StrategyPattern/Vehicle/VehicleBehavior.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPattern.Vehicle 2 | { 3 | public abstract class VehicleBehavior 4 | { 5 | public abstract void AboutMe(string vehicle); 6 | } 7 | } 8 | --------------------------------------------------------------------------------