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InkCanvasForClass/Helpers/DrawingVisualCanvas.cs

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+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Drawing;
+using System.Windows;
+using System.Windows.Ink;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using Pen = System.Windows.Media.Pen;
+
+namespace Ink_Canvas.Helpers
+{
+    
+    public class DrawingVisualCanvas : FrameworkElement
+    {
+        private VisualCollection _children;
+        public DrawingVisual DrawingVisual = new DrawingVisual();
+
+        public DrawingVisualCanvas()
+        {
+            _children = new VisualCollection(this) {
+                DrawingVisual // 初始化DrawingVisual
+            };
+        }
+
+        protected override int VisualChildrenCount => _children.Count;
+
+        protected override Visual GetVisualChild(int index)
+        {
+            if (index < 0 || index >= _children.Count) throw new ArgumentOutOfRangeException();
+            return _children[index];
+        }
+    }
+}