添加项目文件。

Util.DiagramDesigner/Converters/ImageUrlConverter.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Data;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+
+namespace Util.DiagramDesigner
+{
+    [ValueConversion(typeof(string), typeof(ImageSource))]
+    public class ImageUrlConverter : IValueConverter
+    {
+        static ImageUrlConverter()
+        {
+            Instance = new ImageUrlConverter();
+        }
+
+        public static ImageUrlConverter Instance
+        {
+            get;
+            private set;
+        }
+
+        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
+        {
+            Uri imagePath = new Uri(value.ToString(), UriKind.RelativeOrAbsolute);
+            ImageSource source = new BitmapImage(imagePath);
+            return source;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}