chainofResponsibility pattern example

Author: anupavanm

ChainOfResponsibilityPattern/ChainOfResponsibilityPattern.csproj

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

ChainOfResponsibilityPattern/Program.cs

@@ -0,0 +1,88 @@
+using System;
+
+namespace ChainOfResponsibilityPattern
+{
+  abstract class Account
+  {
+    private Account mSuccessor;
+    protected decimal mBalance;
+
+    public void SetNext(Account account)
+    {
+      mSuccessor = account;
+    }
+
+    public void Pay(decimal amountTopay)
+    {
+      if (CanPay(amountTopay))
+      {
+        Console.WriteLine("Paid {0:c} using {1}.", amountTopay, this.GetType().Name);
+      }
+      else if (this.mSuccessor != null)
+      {
+        Console.WriteLine("Cannot pay using {0}. Proceeding..", this.GetType().Name);
+        mSuccessor.Pay(amountTopay);
+      }
+      else
+      {
+        throw new Exception("None of the accounts have enough balance");
+      }
+    }
+    private bool CanPay(decimal amount)
+    {
+      return mBalance >= amount ? true : false;
+    }
+  }
+
+  class Bank : Account
+  {
+    public Bank(decimal balance)
+    {
+      this.mBalance = balance;
+    }
+  }
+
+  class Paypal : Account
+  {
+    public Paypal(decimal balance)
+    {
+      this.mBalance = balance;
+    }
+  }
+
+  class Bitcoin : Account
+  {
+    public Bitcoin(decimal balance)
+    {
+      this.mBalance = balance;
+    }
+  }
+  class Program
+  {
+    static void Main(string[] args)
+    {
+      // Let's prepare a chain like below
+      //      $bank->$paypal->$bitcoin
+      //
+      // First priority bank
+      //      If bank can't pay then paypal
+      //      If paypal can't pay then bit coin
+      var bank = new Bank(100);          // Bank with balance 100
+      var paypal = new Paypal(200);      // Paypal with balance 200
+      var bitcoin = new Bitcoin(300);    // Bitcoin with balance 300
+
+      bank.SetNext(paypal);
+      paypal.SetNext(bitcoin);
+
+      // Let's try to pay using the first priority i.e. bank
+      bank.Pay(259);
+      // Output will be
+      // ==============
+      // Cannot pay using bank. Proceeding ..
+      // Cannot pay using paypal. Proceeding ..:
+      // Paid 259 using Bitcoin!
+
+      Console.ReadLine();
+    }
+  }
+}

DesignPatterns.sln

@@ -27,6 +27,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FlyweightPattern", "Flyweig
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ProxyPattern", "ProxyPattern\ProxyPattern.csproj", "{CE4E3751-C4D9-440E-9E25-3E7EA61F4A7D}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ChainOfResponsibilityPattern", "ChainOfResponsibilityPattern\ChainOfResponsibilityPattern.csproj", "{E94F9FB8-B495-4A85-BAB4-0B08C69BA2D9}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -81,6 +83,10 @@ Global
 		{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
+		{E94F9FB8-B495-4A85-BAB4-0B08C69BA2D9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E94F9FB8-B495-4A85-BAB4-0B08C69BA2D9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E94F9FB8-B495-4A85-BAB4-0B08C69BA2D9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E94F9FB8-B495-4A85-BAB4-0B08C69BA2D9}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE