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做PowerPoint的VSTO插件项目，遇到个很奇怪的问题，当代码执行删除某些Shape时，没问题，但是操作Undo也就是恢复后，无法再次获取到之前删除的对象，这种情况只在Office2007中出现，亲测2010没问题。
就在快要放弃的时候，终于看到了这个
传送门：https://www.add-in-express.com/creating-addins-blog/2014/06/24/exception-hresult-0x800a01a8/
关键内容搬运如下：
private void adxRibbonButton1_OnClick(object sender, IRibbonControl control, bool pressed) { PowerPoint.DocumentWindow activeWindow = PowerPointApp.ActiveWindow; if (activeWindow != null) { PowerPoint.View view = activeWindow.View; if (view != null) { object obj = view.Slide; if (obj != null) { if (obj is PowerPoint.Slide) { PowerPoint.Shapes shapes = (obj as PowerPoint.Slide).Shapes; if (shapes.HasTitle == Microsoft.Office.Core.MsoTriState.msoTrue) { PowerPoint.Shape titleShape = shapes.Title; object titleParent = null; try { titleParent = titleShape.Parent; } catch (Exception ex) { MessageBox.Show(ex.Message); } if (titleParent != null) { // use titleParent } titleShape.Delete(); // leaving the COM object below unreleased causes 0x800A01A8 if you click Undo in the PP UI and invoke this code anew Marshal.ReleaseComObject(titleShape); titleShape = null; } Marshal.ReleaseComObject(shapes); shapes = null; } Marshal.ReleaseComObject(obj); obj = null; } Marshal.ReleaseComObject(view); view = null; } Marshal.ReleaseComObject(activeWindow); activeWindow = null; } }
理解后，很容易就解决了这个问题，分享一下
VSTO PowerPoint 代码删除Shape后再恢复出现无法再次获取的问题
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原文地址：http://www.cnblogs.com/jiushiliu/p/5701386.html
