如何从IDragData获取OnDrageEnter事件中的文件内容？

Question

在CefSharp的winforms实现中，我实现了IDragHandler。

在OnDragEnter事件中，我想要获取文件内容。

当前我正在使用

Dim st As IO.Stream = Nothing
Dim i As Integer = dragData.GetFileContents(st)

没有数据写入流。

您能从从外部（例如桌面）拖动到浏览器的文件中获取文件内容吗？

我认为这是一个上游问题，但是，如果我拖动一个选定的Outlook项目，则dragData没有文件或文件名，但是IsFragment为true，而FragmentText包含有关电子邮件的一般信息，例如主题。这是上游问题吧？

Answer 1

Adding my comment to the answer please see Issue 322605: Drag and Drop support for E-Mails from Microsoft Outlook.

To be complete I wanted to add how I solved this until Chromium catches up. I am hosting my CEFSharp winforms instance in a WPF window. When the CefSharp OnDragEnter event fires I open an almost transparent popup directly under the mouse pointer. This popup has the drag events for WPF enabled and once they fire and give me the dragged contents i close the popup. It is a little but tricky as the OnDragEnter event from CefSharp fires once the popup is gone but otherwise I can find out what is being dragged.