Projektdateien hinzufügen.

VideoBrowser/Common/NotifyPropertyChanged.cs

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+namespace VideoBrowser.Common
+{
+    using System.ComponentModel;
+    using System.Runtime.CompilerServices;
+
+    /// <summary>
+    /// Defines the <see cref="NotifyPropertyChanged" />
+    /// Standard INotifyPropertyChanged implementation.
+    /// </summary>
+    public class NotifyPropertyChanged : INotifyPropertyChanged
+    {
+        /// <summary>
+        /// Defines the PropertyChanged
+        /// </summary>
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        /// <summary>
+        /// The property changed handler
+        /// </summary>
+        protected PropertyChangedEventHandler PropertyChangedHandler => this.PropertyChanged;
+
+        /// <summary>
+        /// The OnPropertyChanged
+        /// </summary>
+        /// <param name="propertyName">The <see cref="string"/></param>
+        public void OnPropertyChanged([CallerMemberName]string propertyName = null)
+        {
+            this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}