AutofacSamples4 implemented

AutofacSample3/AutofacSamples4.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

AutofacSample3/Program.cs

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+using System;
+
+namespace AutofacSamples4
+{
+
+    public interface ILog
+    {
+        void Write(string message);
+    }
+
+    public class ConsoleLog : ILog
+    {
+        public ConsoleLog()
+        {
+            Console.WriteLine($"Console log created at {DateTime.Now.Ticks}");
+        }
+        public void Write(string message)
+        {
+            Console.WriteLine(message);
+        }
+
+        public void Dispose()
+        {
+            Console.WriteLine($"Console logger no longer required");
+        }
+
+    }
+
+    public class SMSLog : ILog
+    {
+        private readonly string phoneNumber;
+
+        public SMSLog(string phoneNumber)
+        {
+            this.phoneNumber = phoneNumber;
+        }
+        public void Write(string message)
+        {
+            Console.WriteLine($"SMS to {phoneNumber} : {message}");
+        }
+        public void Dispose()
+        {
+        }
+    }
+
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello World!");
+        }
+    }
+}