updated

Helper.cs

@@ -0,0 +1,55 @@
+using System;
+using System.IO;
+using System.Runtime.CompilerServices;
+using System.Security.Cryptography;
+
+namespace SmallInjectorDemo
+{
+    /// <summary>
+    /// Static helper class for generating random numbers.
+    /// </summary>
+    public static class Helper
+    {
+        /// <summary>
+        /// Return cryptographic stable random integer.
+        /// </summary>
+        /// <param name="min">Lower border of result.</param>
+        /// <param name="max">Upper border of result.</param>
+        /// <returns>Random integer.</returns>
+        public static int NewRandomInteger(int min, int max)
+        {
+            // The random number provider.
+            using (var rand = new RNGCryptoServiceProvider())
+            {
+                var scale = uint.MaxValue;
+                while (scale == uint.MaxValue)
+                {
+                    // Get four random bytes.
+                    var four_bytes = new byte[4];
+                    rand.GetBytes(four_bytes);
+
+                    // Convert that into an uint.
+                    scale = BitConverter.ToUInt32(four_bytes, 0);
+                }
+
+                // Add min to the scaled difference between max and min.
+                return (int) (min + (max - min) * (scale / (double) uint.MaxValue));
+
+            }
+        }
+
+
+        /// <summary>
+        /// Write method string.
+        /// </summary>
+        /// <param name="id">id of the object</param>
+        /// <param name="memberName">member name</param>
+        /// <param name="filepath">file path</param>
+        /// <returns></returns>
+        public static string WriteMethodString(int id, [CallerMemberName] string memberName = null, [CallerFilePath] string filepath = null)
+        {
+            var classname = Path.GetFileNameWithoutExtension(filepath);
+            return $"{classname}.{memberName?.TrimStart('.')}".PadRight(30) + $"Id: {id}";
+        }
+    }
+}

Program.cs

@@ -6,28 +6,28 @@ namespace SmallInjectorDemo
     {
         private static void Main()
         {
-            Console.WriteLine("Small dependency injection example.");
-            Console.WriteLine();
+            Console.WriteLine("Small dependency injection example");
             var injector = new SmallInjector();
             Console.WriteLine("Register " + nameof(ServiceOne));
             injector.RegisterType<ServiceOne, IServiceOne>(true);
             Console.WriteLine("Register " + nameof(ServiceTwo));
             injector.RegisterType<ServiceTwo, IServiceTwo>(true);
-            Console.WriteLine("Register " + nameof(UsefulClass));
-            injector.RegisterType<UsefulClass>(false);
+            Console.WriteLine("Register " + nameof(ServiceConsumer));
+            injector.RegisterType<ServiceConsumer>(false);
 
             Console.WriteLine();
-            Console.WriteLine("Resolve class instances.");
-            var useful1 = injector.Resolve<UsefulClass>();
-            var useful2 = injector.Resolve<UsefulClass>();
-            var useful3 = injector.Resolve<UsefulClass>();
-            Console.WriteLine("Run test methods.");
+            Console.WriteLine("Resolve class instances:");
+            var useful1 = injector.Resolve<ServiceConsumer>();
+            var useful2 = injector.Resolve<ServiceConsumer>();
+            var useful3 = injector.Resolve<ServiceConsumer>();
+            Console.WriteLine();
+            Console.WriteLine("Run test methods:");
             useful1.TestTheServices();
             Console.WriteLine();
             useful2.TestTheServices();
             Console.WriteLine();
             useful3.TestTheServices();
-            //Console.ReadLine();
+            Console.ReadLine();
         }
     }
 }

ServiceConsumer.cs

@@ -0,0 +1,41 @@
+using System;
+
+namespace SmallInjectorDemo
+{
+    /// <summary>
+    /// A very useful class.
+    /// </summary>
+    public class ServiceConsumer
+    {
+        private readonly IServiceOne _service1;
+        private readonly IServiceTwo _service2;
+        private readonly int _id;
+
+        /// <summary>
+        /// Creates a new instance of <see cref="ServiceConsumer"/>.
+        /// </summary>
+        /// <param name="service1">injected service one.</param>
+        /// <param name="service2">injected service two.</param>
+        public ServiceConsumer(IServiceOne service1, IServiceTwo service2)
+        {
+            _service1 = service1;
+            _service2 = service2;
+            _id = Helper.NewRandomInteger(10, 99);
+            Console.WriteLine(Helper.WriteMethodString(_id));
+        }
+
+        /// <summary>
+        /// Test the injected services.
+        /// </summary>
+        public void TestTheServices()
+        {
+            Console.WriteLine(ToString());
+            Console.WriteLine(_service1.ToString());
+            Console.WriteLine(_service2.ToString());
+        }
+
+        /// <inheritdoc />
+        public override string ToString() => Helper.WriteMethodString(_id);
+
+    }
+}

ServiceOne.cs

@@ -2,25 +2,25 @@ using System;
 
 namespace SmallInjectorDemo
 {
+    /// <inheritdoc />
     /// <summary>
-    /// Implementation of <see cref="IServiceOne"/>.
+    /// Implementation of <see cref="T:SmallInjectorDemo.IServiceOne" />.
     /// </summary>
     public class ServiceOne : IServiceOne
     {
-        private const string MyName = nameof(ServiceOne);
-        private readonly int _rand;
+        private readonly int _id;
 
         /// <summary>
         /// Creates a new instance of <see cref="ServiceOne"/>.
         /// </summary>
         public ServiceOne()
         {
-            _rand = RandomHelper.NewRandomInteger(10, 99);
-            Console.WriteLine(MyName + ".ctor\t\tId: " + _rand);
+            _id = Helper.NewRandomInteger(10, 99);
+            Console.WriteLine(Helper.WriteMethodString(_id));
         }
 
         /// <inheritdoc />
-        public override string ToString() => MyName + ".ToString()\tId: " + _rand;
+        public override string ToString() => Helper.WriteMethodString(_id);
     }
 
     /// <summary>

ServiceTwo.cs

@@ -2,25 +2,25 @@ using System;
 
 namespace SmallInjectorDemo
 {
+    /// <inheritdoc />
     /// <summary>
-    /// Implementation of <see cref="IServiceTwo"/>.
+    /// Implementation of <see cref="T:SmallInjectorDemo.IServiceTwo" />.
     /// </summary>
     public class ServiceTwo : IServiceTwo
     {
-        private const string MyName = nameof(ServiceTwo);
-        private readonly int _rand;
+        private readonly int _id;
 
         /// <summary>
         /// Creates a new instance of <see cref="ServiceTwo"/>.
         /// </summary>
         public ServiceTwo()
         {
-            _rand = RandomHelper.NewRandomInteger(10, 99);
-            Console.WriteLine(MyName + ".ctor\t\tId: " + _rand);
+            _id = Helper.NewRandomInteger(10, 99);
+            Console.WriteLine(Helper.WriteMethodString(_id));
         }
 
         /// <inheritdoc />
-        public override string ToString() => MyName + ".ToString()\tId: " + _rand;
+        public override string ToString() => Helper.WriteMethodString(_id);
     }
 
     /// <summary>