如何将文件从C#WinForms应用程序拖动到Outlook消息 [英] How to drag files from c# winforms app to outlook message

问题描述

我正在尝试将一个或多个文件从我的应用程序拖到Outlook邮件消息中. 如果我将鼠标拖到桌面上，文件将按预期复制到桌面上，但是当拖到新的Outlook 2013邮件中时，什么也不会发生...仅当我显式拖到附件文本框"时，它们才会出现有用，因为默认情况下不显示附件文本框.

I'm trying to drag one or more files from my application to an outlook mail-message. If I drag to my desktop the files are copied to the desktop as expected, but when dragging into a new outlook 2013 mail message, nothing happens... Only when I drag explicitly to the 'attachments textbox' do they appear, this is not helpful because the attachment-textbox isn't shown by default.

我不明白为什么当我将文件从桌面拖到邮件中时，我可以将其拖放，并且附件文本会自动显示，并显示文件，但是当我从应用程序中拖拽时，它无法正常工作... ，这是我的代码:

I don't understand why when I drag file(s) from my desktop to the mail I can just drop them and the attachment-text automatically appears showing the files but when I drag from my app it's not working..., here's my code :

'

    private void Form1_MouseDown(object sender, MouseEventArgs e)
    {
        var _files = new string[] { @"E:\Temp\OR_rtftemplates.xml", @"E:\Temp\Tail.Web_Trace.cmd" };
        var fileDragData = new DataObject(DataFormats.FileDrop, _files);

        (sender as Form).DoDragDrop(fileDragData, DragDropEffects.All);

        Console.WriteLine("{0} - button1_MouseDown", DateTime.Now.TimeOfDay);
    }

'

我还使用'SetFileDropList'方法将文件添加到了DataObject中，但这没什么区别.

I've also added the files to the DataObject by using the 'SetFileDropList' method but that makes no difference.

必须具有一些神奇的属性，我才能通过Outlook消息使它正常工作.

The must be some magic property I have to set to get this working right with an outlook-message.

我希望有人能对此有所启发.

I hope someone can shed some light on this.

谢谢， 茹仁.

推荐答案

在将.NET target更改为4.0并重新编译之后，我刚刚在运行.NET 4.0的计算机(应用程序在.NET 4.5中进行了编译)上测试了其他内容.确实可以正常工作，将文件拖到新的Outlook消息中，这很奇怪，以后再迁移到.NET 4.5时可能会出现问题...但是目前可以正常工作...

I just tested some other stuff on a machine running .NET 4.0 (app was compiled in .NET 4.5), after changing .NET target to 4.0 and recompiling it does work, dragging files into a new outlook message, very strange, might be a problem when migrating to .NET 4.5 later... but for now it works...

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