command design pattern

behavioral/command/CommandSample.cs

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+using System;
+using System.Threading.Tasks;
+
+namespace design_patterns.behavioral.command
+{
+    /// <summary>
+    /// Command is a behavioral design pattern that turns a request 
+    /// into a stand-alone object that contains all information about the request.
+    /// This transformation lets you pass requests 
+    /// as a method arguments, delay or queue a request’s execution, 
+    /// and support undoable operations.
+    /// 
+    /// Use when:
+    /// - you want to parametrize objects with operations.
+    /// - you want to queue operations, schedule their execution, 
+    ///     or execute them remotely. (serialize commands)
+    /// - you want to implement reversible operations.
+    /// </summary>
+    public class CommandSample
+    {
+        public static async Task Run()
+        {
+            Console.WriteLine("Behavioral - Command");
+
+            var order = new Order {
+                ID = Guid.NewGuid().ToString()
+            };
+            ICommand addCommand = new AddOrderCommand(order);
+            addCommand.Execute();
+            ICommand removeCommand = new RemoveOrderCommand(order.ID);
+            removeCommand.Execute();
+        }
+    }
+
+    public interface ICommand
+    {
+        void Execute();
+    }
+
+    public class AddOrderCommand : ICommand {
+        public AddOrderCommand(Order order) => this.Order = order;
+
+        public Order Order { get; private set; }
+
+        public void Execute()
+        {
+            Console.WriteLine($"Execute add order command for order {Order.ID}");
+        }
+    }
+
+    public class RemoveOrderCommand : ICommand {
+        public RemoveOrderCommand(string orderId) => this.OrderID = orderId;
+
+        public string OrderID { get; private set; }
+
+        public void Execute()
+        {
+            Console.WriteLine($"Execute remove order command for order {OrderID}");
+        }
+    }
+
+    public class Order {
+        public string ID { get; set; }
+    }
+}