破坏性更新，移除了Core/Framework（对应的上下文类移动到了Library）

Serein.Workbench.Avalonia/Custom/Views/ConnectionLineShape.cs

@@ -62,7 +62,7 @@ namespace Serein.Workbench.Avalonia.Custom.Views
             //visualPen.Freeze(); // Freeze以提高性能
 
             linkSize = 4;  // 整线条粗细
-            int zIndex = 999999;
+            int zIndex = -999999;
            
             this.ZIndex = zIndex;
             //Panel.SetZIndex(this, zIndex); // 置底
@@ -111,6 +111,15 @@ namespace Serein.Workbench.Avalonia.Custom.Views
             this.leftPoint = left;
             InvalidateVisual(); // 触发重绘
         }
+        /// <summary>
+        /// 刷新颜色
+        /// </summary>
+        /// <param name="brush"></param>
+        public void UpdateColor(Brush brush )
+        {
+            visualPen = new Pen(brush, 3.0); // 默认可视化Pen
+            InvalidateVisual(); // 触发重绘
+        }
 
         /// <summary>
         /// 控件重绘事件