Selection.CopyAsPicture 只是用来拷贝图片而不是将文字转化为图片

在工作中有客户问下面的代码为什么会返回false。

Word.Selection wdSelection = Application.Selection;
Clipboard.Clear();
Application.ActiveWindow.Selection
.SetRange(Application.ActiveDocument
.Bookmarks["\Page"].Range.Start,
Application.ActiveDocument.Bookmarks["\Page"].Range.End - 1);
Application.ActiveWindow.Selection.CopyAsPicture();
bool b = Clipboard.ContainsImage();
if (b)
MessageBox.Show("YES");
else
MessageBox.Show("NO");Word.Selection w