添加项目文件。

Util.DiagramDesigner/Helpers/WeakINPCEventHandler.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Diagnostics;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+
+namespace Util.DiagramDesigner.Helpers
+{
+    //[DebuggerNonUserCode]
+    public sealed class WeakINPCEventHandler 
+    {
+        private readonly WeakReference _targetReference;
+        private readonly MethodInfo _method;
+
+        public WeakINPCEventHandler(PropertyChangedEventHandler callback)
+        {
+            _method = callback.Method;
+            _targetReference = new WeakReference(callback.Target, true);
+        }
+
+        //[DebuggerNonUserCode]
+        public void Handler(object sender, PropertyChangedEventArgs e)
+        {
+            var target = _targetReference.Target;
+            if (target != null)
+            {
+                var callback = (Action<object, PropertyChangedEventArgs>)Delegate.CreateDelegate(typeof(Action<object, PropertyChangedEventArgs>), target, _method, true);
+                if (callback != null)
+                {
+                    callback(sender, e);
+                }
+            }
+        }
+    }
+}