添加项目文件。

Util.DiagramDesigner/StyleSelectors/DesignerItemsControlItemStyleSelector.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace Util.DiagramDesigner
+{
+    public class DesignerItemsControlItemStyleSelector : StyleSelector
+    {
+        static DesignerItemsControlItemStyleSelector()
+        {
+            Instance = new DesignerItemsControlItemStyleSelector();
+        }
+
+        public static DesignerItemsControlItemStyleSelector Instance
+        {
+            get;
+            private set;
+        }
+
+
+        public override Style SelectStyle(object item, DependencyObject container)
+        {
+            ItemsControl itemsControl = ItemsControl.ItemsControlFromItemContainer(container);
+            if (itemsControl == null)
+                throw new InvalidOperationException("DesignerItemsControlItemStyleSelector : Could not find ItemsControl");
+
+            if (item is GifImageItemViewModel)
+            {
+                return (Style)itemsControl.FindResource("gifimageItemStyle");
+            }
+
+            if (item is LinkPointDesignerItemViewModel)
+            {
+                return (Style)itemsControl.FindResource("linkpointItemStyle");
+            }
+
+            if (item is PointDesignerItemViewModel)
+            {
+                return (Style)itemsControl.FindResource("pointItemStyle");
+            }
+
+            if (item is LogicalGateItemViewModelBase)
+            {
+                return (Style)itemsControl.FindResource("logicalItemStyle");
+            }
+
+            if (item is DesignerItemViewModelBase)
+            {
+
+                return (Style)itemsControl.FindResource("designerItemStyle");
+            }
+            
+            if (item is ConnectorViewModel)
+            {
+                return (Style)itemsControl.FindResource("connectorItemStyle");
+            }           
+
+            return null;
+        }
+    } 
+}