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Microsoft.Office.Interop.Outlook Attachments DisplayName error
The `DisplayName` parameter in the `Attachments.Add` method is not used to control the display name of the attachment within the email body. Instead, it represents the name of the attachment file itself. The display name of the attachment within the email body is typically derived from the file name specified in the `Source` parameter.
If you want to control the display name of the attachment within the email body, you can modify the `Content-Disposition` header of the attachment. Here's an example of how you can achieve this:
Outlook.Application outlookApp = new Outlook.Application();
Outlook.MailItem mailItem = (Outlook.MailItem)outlookApp.CreateItem(Outlook.OlItemType.olMailItem);
mailItem.Subject = "Email Subject";
mailItem.HTMLBody = "<html><body>Email Body</body></html>";
// Attach a file with a custom display name
string attachmentPath = "C:\\Path\\To\\Attachment.pdf";
Outlook.Attachment attachment = mailItem.Attachments.Add(attachmentPath, Outlook.OlAttachmentType.olByValue, 1, "Custom Display Name");
// Modify the Content-Disposition header to set the desired display name
attachment.PropertyAccessor.SetProperty("http://schemas.microsoft.com/mapi/proptag/0x3712001F", "New Display Name");
// Send or display the email
mailItem.Display();In the code snippet above, the `Attachment` object's `PropertyAccessor` is used to access the `Content-Disposition` header property (`0x3712001F`). By setting the value of this property, you can control the display name of the attachment within the email body.
Please note that this approach uses the Outlook interop library and is specific to Outlook desktop applications. If you are working with a different email client or using a different method to send emails, the attachment display name behavior may vary.
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I do not want to control the display name of the attachment, I just want is behavior as in definition that Microsoft gives: “if the mail item is in Plain Text or HTML format, then the attachment is displayed using the file name in the Source parameter”.
The point is: I need to use the DisplayName property to save other information that is not supposed to be displayed.
