mvvm sample

PacticeSolution/MVVMSample/Model/NotifierMain.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MVVMSample.Model
+{
+    internal class NotifierMain : INotifyPropertyChanged
+    {
+        public event PropertyChangedEventHandler? PropertyChanged;
+
+        public virtual void NotifyChanged(params string[] propertyNames)
+        {
+            foreach (string name in propertyNames)
+            {
+                OnPropertyChanged(new PropertyChangedEventArgs(name));
+            }
+        }
+
+        protected virtual void OnPropertyChanged(PropertyChangedEventArgs e)
+        {
+            if (PropertyChanged != null)
+                PropertyChanged(this, e);
+        }
+
+        protected virtual void OnPropertyChanged(string propertyName)
+        {
+            if (PropertyChanged != null)
+                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}