add:issue #190

Ink Canvas/Helpers/PPTInkManager.cs

@@ -204,32 +204,6 @@ namespace Ink_Canvas.Helpers
                         return LoadSlideStrokes(slideIndex);
                     }
 
-                    // 如果有当前墨迹，先保存到正确的页面
-                    if (currentStrokes != null && currentStrokes.Count > 0)
-                    {
-                        // 否则使用传入的页面索引，确保墨迹保存到正确的页面
-                        int saveToSlideIndex;
-                        if (_lockedSlideIndex > 0 && DateTime.Now < _inkLockUntil && _lockedSlideIndex != slideIndex)
-                        {
-                            saveToSlideIndex = _lockedSlideIndex;
-                            LogHelper.WriteLogToFile($"使用锁定页面保存墨迹: {saveToSlideIndex} -> {slideIndex}", LogHelper.LogType.Trace);
-                        }
-                        else
-                        {
-                            saveToSlideIndex = slideIndex;
-                        }
-
-                        // 确保页面索引有效
-                        if (saveToSlideIndex > 0 && saveToSlideIndex < _memoryStreams.Length)
-                        {
-                            SaveCurrentSlideStrokes(saveToSlideIndex, currentStrokes);
-                            LogHelper.WriteLogToFile($"已保存第{saveToSlideIndex}页墨迹，墨迹数量: {currentStrokes.Count}", LogHelper.LogType.Trace);
-                        }
-                        else
-                        {
-                            LogHelper.WriteLogToFile($"页面索引无效，无法保存墨迹: {saveToSlideIndex}", LogHelper.LogType.Warning);
-                        }
-                    }
 
                     // 设置墨迹锁定
                     LockInkForSlide(slideIndex);

Ink Canvas/MainWindow_cs/MW_PPT.cs

@@ -1096,7 +1096,18 @@ namespace Ink_Canvas
         {
             try
             {
-                var newStrokes = _multiPPTInkManager?.SwitchToSlide(newSlideIndex, inkCanvas.Strokes);
+                // 获取当前页面索引
+                var currentSlideIndex = _pptManager?.GetCurrentSlideNumber() ?? 0;
+                
+                // 如果有当前墨迹且不是第一次切换，先保存到当前页面
+                if (inkCanvas.Strokes.Count > 0 && currentSlideIndex > 0 && currentSlideIndex != newSlideIndex)
+                {
+                    _multiPPTInkManager?.SaveCurrentSlideStrokes(currentSlideIndex, inkCanvas.Strokes);
+                    LogHelper.WriteLogToFile($"切换前保存第{currentSlideIndex}页墨迹，墨迹数量: {inkCanvas.Strokes.Count}", LogHelper.LogType.Trace);
+                }
+                
+                // 切换到新页面并加载墨迹
+                var newStrokes = _multiPPTInkManager?.SwitchToSlide(newSlideIndex, null);
                 if (newStrokes != null)
                 {
                     inkCanvas.Strokes.Clear();