C# and WPF tutorial files

WPF/03-TreeViewsSimpleViewModel/WpfTreeView/HeaderToImageConverter.cs

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+using System;
+using System.Globalization;
+using System.IO;
+using System.Windows.Data;
+using System.Windows.Media.Imaging;
+
+namespace WpfTreeView
+{
+    /// <summary>
+    /// Converts a full path to a specific image type of a drive, folder or file
+    /// </summary>
+    [ValueConversion(typeof(DirectoryItemType), typeof(BitmapImage))]
+    public class HeaderToImageConverter : IValueConverter
+    {
+        public static HeaderToImageConverter Instance = new HeaderToImageConverter();
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            // By default, we presume an image
+            var image = "Images/file.png";
+
+            switch ((DirectoryItemType)value)
+            {
+                case DirectoryItemType.Drive:
+                    image = "Images/drive.png";
+                    break;
+                case DirectoryItemType.Folder:
+                    image = "Images/folder-closed.png";
+                    break;
+            }
+
+            return new BitmapImage(new Uri($"pack://application:,,,/{image}"));
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}