decorator

DesignPatternGuru/Decorator/Client.cs

@@ -0,0 +1,17 @@
+using Decorator.Components;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Decorator
+{
+	internal class Client
+	{
+		public void ClientCode(Component component)
+		{
+			Console.WriteLine($"RESULT: {component.Operation()}");
+		}
+	}
+}

DesignPatternGuru/Decorator/Components/Component.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Decorator.Components
+{
+	public abstract class Component
+	{
+		public abstract string Operation();
+	}
+}

DesignPatternGuru/Decorator/Components/ConcreteComponent.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Decorator.Components
+{
+	internal class ConcreteComponent : Component
+	{
+		public override string Operation()
+		{
+			return "ConcreteComponent";
+		}
+	}
+}

DesignPatternGuru/Decorator/Decorator.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

DesignPatternGuru/Decorator/Decorators/ConcreteDecoratorA.cs

@@ -0,0 +1,21 @@
+using Decorator.Components;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Decorator.Decorators
+{
+	internal class ConcreteDecoratorA : Decorator
+	{
+		public ConcreteDecoratorA(Component component) : base(component)
+		{
+		}
+
+		public override string Operation()
+		{
+			return $"ConcreateDecoratorA({base.Operation()})";
+		}
+	}
+}

DesignPatternGuru/Decorator/Decorators/ConcreteDecoratorB.cs

@@ -0,0 +1,21 @@
+using Decorator.Components;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Decorator.Decorators
+{
+	internal class ConcreteDecoratorB : Decorator
+	{
+		public ConcreteDecoratorB(Component component) : base(component)
+		{
+		}
+
+		public override string Operation()
+		{
+			return $"ConcreteDecoratorB({base.Operation()})";
+		}
+	}
+}

DesignPatternGuru/Decorator/Decorators/Decorator.cs

@@ -0,0 +1,32 @@
+using Decorator.Components;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Decorator.Decorators
+{
+	abstract class Decorator : Component
+	{
+		protected Component _component;
+
+		public Decorator(Component component)
+		{
+			_component = component;
+		}
+
+		public void SetComponent(Component component)
+		{
+			_component = component;
+		}
+
+		public override string Operation()
+		{
+			if (_component == null)
+				return String.Empty;
+
+			return _component.Operation();
+		}
+	}
+}

DesignPatternGuru/Decorator/Program.cs

@@ -0,0 +1,24 @@
+using Decorator.Components;
+using Decorator.Decorators;
+using System.ComponentModel;
+
+namespace Decorator
+{
+	internal class Program
+	{
+		static void Main(string[] args)
+		{
+			Client client = new Client();
+
+			ConcreteComponent simple = new ConcreteComponent();
+			Console.WriteLine("Client: I get a simple component:");
+			client.ClientCode(simple);
+			Console.WriteLine();
+
+			ConcreteDecoratorA decorator1 = new ConcreteDecoratorA(simple);
+			ConcreteDecoratorB decorator2 = new ConcreteDecoratorB(decorator1);
+			Console.WriteLine("Client: Now I've got a decorated component:");
+			client.ClientCode(decorator2);
+		}
+	}
+}

DesignPatternGuru/DesignPatternGuru.sln

@@ -21,7 +21,9 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Adapter", "Adapter\Adapter.
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Bridge", "Bridge\Bridge.csproj", "{60D1EE6E-282D-4613-8B1D-DE355768DCBA}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Composite", "Composite\Composite.csproj", "{8EAAC7FD-ED5E-4567-B1C1-F79AC79C9820}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Composite", "Composite\Composite.csproj", "{8EAAC7FD-ED5E-4567-B1C1-F79AC79C9820}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Decorator", "Decorator\Decorator.csproj", "{8AA3ECFD-4F9A-433D-884C-E76E5050AFBF}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -61,6 +63,10 @@ Global
 		{8EAAC7FD-ED5E-4567-B1C1-F79AC79C9820}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{8EAAC7FD-ED5E-4567-B1C1-F79AC79C9820}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{8EAAC7FD-ED5E-4567-B1C1-F79AC79C9820}.Release|Any CPU.Build.0 = Release|Any CPU
+		{8AA3ECFD-4F9A-433D-884C-E76E5050AFBF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8AA3ECFD-4F9A-433D-884C-E76E5050AFBF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8AA3ECFD-4F9A-433D-884C-E76E5050AFBF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8AA3ECFD-4F9A-433D-884C-E76E5050AFBF}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -74,6 +80,7 @@ Global
 		{4E8B1160-0BD2-42FD-9DB8-991CAA88578A} = {0B9333EC-FB73-4FEE-B600-9ECCD5A356B1}
 		{60D1EE6E-282D-4613-8B1D-DE355768DCBA} = {0B9333EC-FB73-4FEE-B600-9ECCD5A356B1}
 		{8EAAC7FD-ED5E-4567-B1C1-F79AC79C9820} = {0B9333EC-FB73-4FEE-B600-9ECCD5A356B1}
+		{8AA3ECFD-4F9A-433D-884C-E76E5050AFBF} = {0B9333EC-FB73-4FEE-B600-9ECCD5A356B1}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {3E5A9C6B-2E8A-466E-B5E0-4379902EFFAC}