first edit

XLIMS.MVVM/Base/RelayCommand.cs

@@ -0,0 +1,89 @@
+using System;
+using System.Diagnostics;
+using System.Windows.Input;
+
+namespace XLIMS.MVVM.Base
+{
+    public class RelayCommand : ICommand
+    {
+        #region Fields
+
+        readonly Action<object> _execute;
+        readonly Predicate<object> _canExecute;
+
+        #endregion // Fields
+
+        #region Constructors
+
+        /// <summary>
+        /// Creates a new command that can always execute.
+        /// </summary>
+        /// <param name="execute">The execution logic.</param>
+        public RelayCommand(Action<object> execute)
+            : this(execute, null)
+        {
+        }
+
+        /// <summary>
+        /// Creates a new command.
+        /// </summary>
+        /// <param name="execute">The execution logic.</param>
+        /// <param name="canExecute">The execution status logic.</param>
+        public RelayCommand(Action<object> execute, Predicate<object> canExecute)
+        {
+            if (execute == null)
+                throw new ArgumentNullException("execute");
+
+            _execute = execute;
+            _canExecute = canExecute;
+        }
+
+        #endregion // Constructors
+
+        #region ICommand Members
+
+        [DebuggerStepThrough]
+        public bool CanExecute(object parameter)
+        {
+            return _canExecute == null ? true : _canExecute(parameter);
+        }
+
+        public event EventHandler CanExecuteChanged
+        {
+            add { CommandManager.RequerySuggested += value; }
+            remove { CommandManager.RequerySuggested -= value; }
+        }
+
+        public void Execute(object parameter)
+        {
+            _execute(parameter);
+        }
+
+        #endregion // ICommand Members
+    }
+
+    public class RelayCommand<T> : ICommand
+    {
+        private readonly Action<T> _execute;
+        private readonly Func<T, bool> _canExecute;
+
+        public RelayCommand(Action<T> execute, Func<T, bool> canExecute = null)
+        {
+            _execute = execute;
+            _canExecute = canExecute;
+        }
+
+        public bool CanExecute(object parameter)
+            => _canExecute == null || _canExecute((T)parameter);
+
+        public void Execute(object parameter)
+            => _execute((T)parameter);
+
+        public event EventHandler CanExecuteChanged
+        {
+            add => CommandManager.RequerySuggested += value;
+            remove => CommandManager.RequerySuggested -= value;
+        }
+    }
+
+}