MVVM Implementing started

SewerStammGen/ViewModel/RelayCommand.cs

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+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace SewerStammGen.ViewModel
+{
+    [Serializable]
+    class RelayCommand : ICommand
+    {
+        #region Fields
+        private readonly Action<object> execute;
+        private readonly Predicate<object> canExecute;
+        #endregion
+
+        #region Constructors
+        public RelayCommand(Action<object> execute) : this(execute, null) { }
+
+        public RelayCommand(Action<object> execute, Predicate<object> canExecute)
+        {
+            if (execute == null) throw new ArgumentNullException("execute");
+            this.execute = execute;
+            this.canExecute = canExecute;
+        }
+        #endregion
+
+        #region ICommand Members
+        [DebuggerStepThrough]
+        public bool CanExecute(object parameter)
+        {
+            if (canExecute == null) return true;
+            return canExecute(parameter);
+        }
+
+        public event EventHandler CanExecuteChanged
+        {
+            add { CommandManager.RequerySuggested += value; }
+            remove { CommandManager.RequerySuggested -= value; }
+        }
+
+        public void Execute(object parameter)
+        {
+            execute(parameter);
+        }
+        #endregion
+    }
+}