ruselknow · September 27, 2021 12:40 · Sep 27, 2021
diff --git a/SetterInjection.cs b/SetterInjection.cs
@@ -0,0 +1,64 @@
+using System;
+namespace DependencyInjection
+{
+    public interface IDependent
+    {
+        void DoSomething();
+    }
+
+    public class Dependent1 : IDependent
+    {
+        public void DoSomething()
+        {
+            Console.WriteLine("Hello from Dependent1");
+        }
+    }
+
+    public class Dependent2 : IDependent
+    {
+        public void DoSomething()
+        {
+            Console.WriteLine("Hello from Dependent2");
+        }
+    }
+
+    public class MainClass
+    {
+        private IDependent _dependent;
+
+        public void SetDependency(IDependent dependent)
+        {
+            _dependent = dependent 
+                         ?? throw new ArgumentNullException(nameof(dependent), "Argument cannot be null");
+        }
+
+        public void DoSomething()
+        {
+            _dependent.DoSomething();
+        }
+    }
+
+    internal static class Program
+    {
+        private static void Main()
+        {
+            // Get the correct dependency
+            var dependency = GetCorrectDependency();
+
+            // Create class 
+            var mainClass = new MainClass();
+
+            //Inject the dependency
+            mainClass.SetDependency(dependency);
+
+            mainClass.DoSomething();
+
+            Console.ReadLine();
+        }
+
+        private static IDependent GetCorrectDependency()
+        {
+            return new Dependent1();
+        }
+    }
+}