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Drag-drop into Outlook asynchronously

I am trying to drag files from my own window into outlook and I got this ([login to view URL]).

This brilliant article demonstrates how to create a customized DataObject implementing delayed data extract on drop/paste and asynchronous data trnasfer on background thread.

It worked perfectly untill I tried to drop a file into Outlook 2016. It still works but the UI is not responsive despite the fact that my dataobject has "IsAsynchronous" set to true.

After debugging I found when dropped to Outlook [login to view URL] is not called and [login to view URL] is called on the UI thread.

My question is does Outlook support IAsyncOperation? If it does what am I missing? If it does not support IAsyncOperation, is there a workaround or different solution?

Regards

Xiao

Taidot: .NET, API, C# -ohjelmointi

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( 0 arvostelua ) Alexandria, Australia

Projektin tunnus: #17982369