command

DesignPatternGuru/Command/Command.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/Command/Commands/ComplexCommand.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Command.Commands
+{
+    internal class ComplexCommand : ICommand
+    {
+        private Receiver _receiver;
+
+        private string _a;
+        private string _b;
+
+        public ComplexCommand(Receiver receiver, string a, string b)
+        {
+            _receiver = receiver;
+            _a = a;
+            _b = b;
+        }
+
+        public void Execute()
+        {
+            Console.WriteLine("ComplexCommand: Complex stuff should be done by a receiver object.");
+            _receiver.DoSomething(_a);
+            _receiver.DoSomething(_b);
+        }
+    }
+}

DesignPatternGuru/Command/Commands/ICommand.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Command.Commands
+{
+    internal interface ICommand
+    {
+        void Execute();
+    }
+}

DesignPatternGuru/Command/Commands/Invoker.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Command.Commands
+{
+    internal class Invoker
+    {
+        private ICommand _onStart;
+        private ICommand _onFinish;
+
+        public void SetOnStart(ICommand command)
+        {
+            _onStart = command;
+        }
+
+        public void SetOnFinish(ICommand command)
+        {
+            _onFinish = command;
+        }
+
+        public void DoSomethingImportant()
+        {
+            Console.WriteLine("Invoker: Does anybody want something done before I begin?");
+            if (_onStart != null)
+            {
+                _onStart.Execute();
+            }
+
+            Console.WriteLine("Invoker: ...doing someting really important...");
+
+            Console.WriteLine("Invoker: Does anybody want something done after I finish?");
+            if (_onFinish != null)
+            {
+                _onFinish.Execute();
+            }
+        }
+    }
+}

DesignPatternGuru/Command/Commands/Receiver.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Command.Commands
+{
+    internal class Receiver
+    {
+        public void DoSomething(string a)
+        {
+            Console.WriteLine( $"Receiver: Working on ({a})");
+        }
+
+        public void DoSometingElse(string b)
+        {
+            Console.WriteLine($"Receiver: Also working on ({b})");
+        }
+    }
+}

DesignPatternGuru/Command/Commands/SimpleCommand.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Command.Commands
+{
+    internal class SimpleCommand : ICommand
+    {
+        private string _payload = string.Empty;
+
+        public SimpleCommand(string payload)
+        {
+            _payload = payload;
+        }
+
+        public void Execute()
+        {
+            Console.WriteLine( $"SimpleCommand: See, I can do simple things like printing ({_payload})");
+        }
+    }
+}

DesignPatternGuru/Command/Program.cs

@@ -0,0 +1,17 @@
+using Command.Commands;
+
+namespace Command
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Invoker invoker = new Invoker();
+            invoker.SetOnStart(new SimpleCommand("Say Hi!"));
+            Receiver receiver = new Receiver();
+            invoker.SetOnFinish(new ComplexCommand(receiver, "Send email", "Save report"));
+
+            invoker.DoSomethingImportant();
+        }
+    }
+}

DesignPatternGuru/DesignPatternGuru.sln

@@ -33,7 +33,9 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Proxy", "Proxy\Proxy.csproj
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "BehavioralPatterns", "BehavioralPatterns", "{E3B8A482-1A9A-4B6E-8310-050A44C8E379}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ChainOfResponsibility", "ChainOfResponsibility\ChainOfResponsibility.csproj", "{9626EF73-1F68-46C8-B7C1-434F02768452}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ChainOfResponsibility", "ChainOfResponsibility\ChainOfResponsibility.csproj", "{9626EF73-1F68-46C8-B7C1-434F02768452}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Command", "Command\Command.csproj", "{629A51B1-04D9-4636-8E21-1712DCFF21DF}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -93,6 +95,10 @@ Global
 		{9626EF73-1F68-46C8-B7C1-434F02768452}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{9626EF73-1F68-46C8-B7C1-434F02768452}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{9626EF73-1F68-46C8-B7C1-434F02768452}.Release|Any CPU.Build.0 = Release|Any CPU
+		{629A51B1-04D9-4636-8E21-1712DCFF21DF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{629A51B1-04D9-4636-8E21-1712DCFF21DF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{629A51B1-04D9-4636-8E21-1712DCFF21DF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{629A51B1-04D9-4636-8E21-1712DCFF21DF}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -111,6 +117,7 @@ Global
 		{D414F5DF-8FB2-4D77-A0C8-77B623A902DD} = {0B9333EC-FB73-4FEE-B600-9ECCD5A356B1}
 		{F0E63700-B550-4D57-B912-18C28B3FEAC6} = {0B9333EC-FB73-4FEE-B600-9ECCD5A356B1}
 		{9626EF73-1F68-46C8-B7C1-434F02768452} = {E3B8A482-1A9A-4B6E-8310-050A44C8E379}
+		{629A51B1-04D9-4636-8E21-1712DCFF21DF} = {E3B8A482-1A9A-4B6E-8310-050A44C8E379}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {3E5A9C6B-2E8A-466E-B5E0-4379902EFFAC}