command pattern

PacticeSolution/CommandPatternSample/ViewModel/EmpViewModel.cs

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+using CommandPatternSample.Command;
+using CommandPatternSample.Model;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CommandPatternSample.ViewModel
+{
+    internal class EmpViewModel : INotifyPropertyChanged
+    {
+        private Emp _selectedEmp;
+        private ObservableCollection<Emp> _emps;
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        public RelayCommand AddEmpCommand { get; set; }
+
+
+        public EmpViewModel()
+        {
+            this.Emps = new ObservableCollection<Emp>();
+            this.Emps.Add(new Emp() { Name = "Tom", Job = "Sales" });
+            this.Emps.Add(new Emp() { Name = "Jack", Job = "Clerk" });
+            this.Emps.Add(new Emp() { Name = "Phinix", Job = "Manager" });
+            this.Emps.Add(new Emp() { Name = "John", Job = "Sales" });
+            this.Emps.Add(new Emp() { Name = "Richard", Job = "Cleaning" });
+
+            this.AddEmpCommand = new RelayCommand(new Action<object>(AddEmp));
+        }
+
+        public Emp SelectedEmp
+        {
+            get { return _selectedEmp; }
+            set
+            {
+                _selectedEmp = value;
+                this.OnPropertyChanged(nameof(SelectedEmp));
+            }
+        }
+
+        public ObservableCollection<Emp> Emps
+        {
+            get { return _emps; }
+            set
+            {
+                _emps = value;
+                this.OnPropertyChanged(nameof(Emps));
+            }
+        }
+
+        public void AddEmp(object param)
+        {
+            if (string.IsNullOrEmpty(param.ToString()))
+                return;
+
+            this.Emps.Add(new Emp { Name = param.ToString(), Job = "New Job" });
+        }
+
+        private void OnPropertyChanged([CallerMemberName] string propertyName = null)
+        {
+            if (this.PropertyChanged == null)
+                return;
+
+            this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}