Observer

PatternsComportamentais/Observer/Assunto.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Observer
+{
+    public abstract class Assunto
+    {
+        private List<Observador> _observadores = new List<Observador>();
+
+        public void Anexar(Observador observador)
+        {
+            this._observadores.Add(observador);
+        }
+
+        public void Desanexar(Observador observador)
+        {
+            this._observadores.Remove(observador);
+        }
+
+        public void Notificar()
+        {
+            foreach (Observador item in _observadores)
+            {
+                item.Update();
+            }
+        }
+    }
+}

PatternsComportamentais/Observer/AssuntoConcreto.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace Observer
+{
+    public class AssuntoConcreto : Assunto
+    {
+        public string EstadoAssunto { get; set; }
+    }
+}

PatternsComportamentais/Observer/Observador.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace Observer
+{
+    public abstract class Observador
+    {
+        public abstract void Update();
+    }
+}

PatternsComportamentais/Observer/ObservadorConcreto.cs

@@ -0,0 +1,25 @@
+using System;
+
+namespace Observer
+{
+    public class ObservadorConcreto : Observador
+    {
+        private string _nome;
+        private string _estadoObservador;
+        private AssuntoConcreto _assunto;
+
+        public ObservadorConcreto(AssuntoConcreto assunto, string nome)
+        {
+            _assunto = assunto;
+            _nome = nome;
+        }
+
+        public override void Update()
+        {
+            this._estadoObservador = this._assunto.EstadoAssunto;
+            Console.WriteLine($"Observador {this._nome}, seu novo estado é: {this._estadoObservador}");
+        }
+
+        public AssuntoConcreto Assunto { get; set; }
+    }
+}

PatternsComportamentais/Observer/Observer.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

PatternsComportamentais/Observer/Program.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace Observer
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            AssuntoConcreto s = new AssuntoConcreto();
+            s.Anexar(new ObservadorConcreto(s, "X"));
+            s.Anexar(new ObservadorConcreto(s, "Y"));
+            s.Anexar(new ObservadorConcreto(s, "Z"));
+
+            s.EstadoAssunto = "ABC";
+            s.Notificar();
+        }
+    }
+}

PatternsComportamentais/PatternsComportamentais.sln

@@ -15,6 +15,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Mediator", "Mediator\Mediat
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Memento", "Memento\Memento.csproj", "{189CDE42-E8FF-4D76-851B-321F75172835}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Observer", "Observer\Observer.csproj", "{88C5750D-1C94-49EA-9402-81EC6DB545AC}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -45,6 +47,10 @@ Global
 		{189CDE42-E8FF-4D76-851B-321F75172835}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{189CDE42-E8FF-4D76-851B-321F75172835}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{189CDE42-E8FF-4D76-851B-321F75172835}.Release|Any CPU.Build.0 = Release|Any CPU
+		{88C5750D-1C94-49EA-9402-81EC6DB545AC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{88C5750D-1C94-49EA-9402-81EC6DB545AC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{88C5750D-1C94-49EA-9402-81EC6DB545AC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{88C5750D-1C94-49EA-9402-81EC6DB545AC}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE