Proxy Pattern example

Author: anupavanm

DesignPatterns.sln

@@ -25,6 +25,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DecoratorPattern", "Decorat
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FlyweightPattern", "FlyweightPattern\FlyweightPattern.csproj", "{FB1E171E-9C39-4EF1-9377-9786AF3C61DA}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ProxyPattern", "ProxyPattern\ProxyPattern.csproj", "{CE4E3751-C4D9-440E-9E25-3E7EA61F4A7D}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -75,6 +77,10 @@ Global
 		{FB1E171E-9C39-4EF1-9377-9786AF3C61DA}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{FB1E171E-9C39-4EF1-9377-9786AF3C61DA}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{FB1E171E-9C39-4EF1-9377-9786AF3C61DA}.Release|Any CPU.Build.0 = Release|Any CPU
+		{CE4E3751-C4D9-440E-9E25-3E7EA61F4A7D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CE4E3751-C4D9-440E-9E25-3E7EA61F4A7D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CE4E3751-C4D9-440E-9E25-3E7EA61F4A7D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{CE4E3751-C4D9-440E-9E25-3E7EA61F4A7D}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

ProxyPattern/Program.cs

@@ -0,0 +1,68 @@
+using System;
+
+namespace ProxyPattern
+{
+  interface IDoor
+  {
+    void Open();
+    void Close();
+  }
+
+  class LabDoor : IDoor
+  {
+    public void Close()
+    {
+      Console.WriteLine("Closing lab door");
+    }
+
+    public void Open()
+    {
+      Console.WriteLine("Opening lab door");
+    }
+  }
+
+  class SecuredDoor
+  {
+    private IDoor mDoor;
+
+    public SecuredDoor(IDoor door)
+    {
+      mDoor = door ?? throw new ArgumentNullException("door", "door can not be null");
+    }
+
+    public void Open(string password)
+    {
+      if (Authenticate(password))
+      {
+        mDoor.Open();
+      }
+      else
+      {
+        Console.WriteLine("Big no! It ain't possible.");
+      }
+    }
+
+    private bool Authenticate(string password)
+    {
+      return password == "$ecr@t" ? true : false;
+    }
+
+    public void Close()
+    {
+      mDoor.Close();
+    }
+  }
+  class Program
+  {
+    static void Main(string[] args)
+    {
+      var door = new SecuredDoor(new LabDoor());
+      door.Open("invalid"); // Big no! It ain't possible.
+
+      door.Open("$ecr@t"); // Opening lab door
+      door.Close(); // Closing lab door
+
+      Console.ReadLine();
+    }
+  }
+}

ProxyPattern/ProxyPattern.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>