重新设计了@get 表达式，修改了 Workbench后台长时间运行时，重新切换到前台会产生参数连接线错误显示的问题

Workbench/Node/INodeJunction.cs

@@ -30,5 +30,15 @@ namespace Serein.Workbench.Node
         /// 返回值控制点
         /// </summary>
         JunctionControlBase ReturnDataJunction { get; }
+
+        /// <summary>
+        /// 获取目标参数控制点，用于防止wpf释放资源导致找不到目标节点，返回-1,-1的坐标
+        /// </summary>
+        /// <param name="index"></param>
+        /// <returns></returns>
+        JunctionControlBase GetJunctionOfArgData(int index)
+        {
+            return ArgDataJunction[index];
+        }
     }
 }

Workbench/Node/Junction/ConnectionLineShape.cs

@@ -62,6 +62,8 @@ namespace Serein.Workbench.Node.View
             InitElementPoint(isDotted, isTop);
             InvalidateVisual(); // 触发重绘
         }
+
+
         public void InitElementPoint(bool isDotted , bool isTop = false)
         {
             hitVisiblePen = new Pen(Brushes.Transparent, 1.0); // 初始化碰撞检测线

Workbench/Node/Junction/JunctionControlBase.cs

@@ -31,10 +31,10 @@ namespace Serein.Workbench.Node.View
         }
     }
     
+
     public class ParamsArgControl: Shape
     {
 
-
         public ParamsArgControl()
         {
             this.MouseDown += ParamsArg_OnMouseDown; // 增加或删除

Workbench/Node/View/ConnectionControl.cs

@@ -113,6 +113,11 @@ namespace Serein.Workbench.Node.View
         /// </summary>
         public ConnectionInvokeType InvokeType { get; }
 
+        /// <summary>
+        /// 目标节点控制点
+        /// </summary>
+        private INodeJunction EndNode;
+
         /// <summary>
         /// 获取参数类型，第几个参数
         /// </summary>
@@ -138,6 +143,8 @@ namespace Serein.Workbench.Node.View
         /// </summary>
         private ConnectionLineShape BezierLine;
 
+
+
         private LineType LineType;
 
         /// <summary>
@@ -168,7 +175,8 @@ namespace Serein.Workbench.Node.View
                                 int argIndex,
                                 ConnectionArgSourceType argSourceType,
                                 JunctionControlBase Start,
-                                JunctionControlBase End)
+                                JunctionControlBase End,
+                                INodeJunction nodeJunction)
         {
             this.LineType = LineType;
             this.Canvas = Canvas;
@@ -176,6 +184,7 @@ namespace Serein.Workbench.Node.View
             this.ArgSourceType = argSourceType;
             this.Start = Start;
             this.End = End;
+            this.EndNode = nodeJunction;
             InitElementPoint();
         }
 
@@ -242,6 +251,10 @@ namespace Serein.Workbench.Node.View
         /// </summary>
         public void RefreshLine()
         {
+            if(ArgIndex > -1)
+            {
+                End = EndNode.GetJunctionOfArgData(ArgIndex);
+            }
             (Point startPoint, Point endPoint) = RefreshPoint(Canvas, Start, End);
             BezierLine.UpdatePoints(startPoint, endPoint);
         }
@@ -255,7 +268,6 @@ namespace Serein.Workbench.Node.View
 
         private (Point startPoint, Point endPoint) RefreshPoint(Canvas canvas, FrameworkElement startElement, FrameworkElement endElement)
         {
-            
             var startPoint = startElement.TranslatePoint(rightCenterOfStartLocation, canvas); // 获取起始节点的中心位置
             var endPoint = endElement.TranslatePoint(leftCenterOfEndLocation, canvas); // 计算终点位置
             return (startPoint, endPoint);