保存SFC数据到xml，json完成，

Util.DiagramDesigner/Models/SelectableDesignerItemBase.cs

@@ -348,6 +348,17 @@ namespace Util.DiagramDesigner
             string[] pieces = point.Split(new char[] { ',' });
             return new Point(double.Parse(pieces[0]), double.Parse(pieces[1]));
         }
+
+        public static string SerializeSize(Size size)
+        {
+            return string.Format("{0},{1}", size.Width, size.Height);
+        }
+
+        public static Size DeserializeSize(string size)
+        {
+            string[] pieces = size.Split(new char[] { ',' });
+            return new Size(double.Parse(pieces[0]), double.Parse(pieces[1]));
+        }
     }
 
 

Util.DiagramDesigner/ViewModels/IDiagramViewModel.cs

@@ -44,20 +44,20 @@ namespace Util.DiagramDesigner
         bool BelongToSameGroup(IGroupable item1, IGroupable item2);
         Rect GetBoundingRectangle(IEnumerable<DesignerItemViewModelBase> items);
         void UpdateZIndex();
-        Size PageSize { get;}
+
+        Size PageSize { get; set; }
         PageSizeType PageSizeType { get; set; }
         bool ShowGrid { get; set; }
         Size GridCellSize { get; set; }
         PageSizeOrientation PageSizeOrientation { get; set; }
-        double GridMargin { get; set; }
-        Color GridColor { get; set; }
-        Point CurrentPoint { get; set; }
-        Color CurrentColor { get; set; }
-
-        DiagramType DiagramType { get; set; }
-
         CellHorizontalAlignment CellHorizontalAlignment { get; set; }
         CellVerticalAlignment CellVerticalAlignment { get; set; }
+        double GridMargin { get; set; }
+        Color GridColor { get; set; }
+        DiagramType DiagramType { get; set; }
+
+        Point CurrentPoint { get; set; }
+        Color CurrentColor { get; set; }
 
         event PropertyChangedEventHandler PropertyChanged;