command pattern

PacticeSolution/CommandPatternSample/Command/RelayCommand.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace CommandPatternSample.Command
+{
+    internal class RelayCommand : ICommand
+    {
+        private Func<object, bool> _canExecute;
+        private Action<object> _executeAction;
+
+        public event EventHandler CanExecuteChanged;
+
+        public RelayCommand(Action<object> executeAction, Func<object, bool> canExeute)
+        {
+            _executeAction = executeAction ?? throw new ArgumentNullException("Execute action is not null");
+            _canExecute = canExeute;
+        }
+
+        public RelayCommand(Action<object> executeAction) : this(executeAction, null)
+        {
+            
+        }
+
+        public bool CanExecute(object parameter)
+        {
+            bool result = _canExecute == null ? true : _canExecute.Invoke(parameter);
+            return result;
+        }
+
+        public void Execute(object parameter)
+        {
+            _executeAction.Invoke(parameter);
+        }
+    }
+}