Graph API Send Mail with Attachments

Question

I'm using Microsoft-Graph API version 1.4 and trying to send mail with attachment using following code..

IGraphServiceClient graphClient = GraphServiceClient.builder().authenticationProvider( authProvider ).buildClient();  
  
Message message = new Message();  
message.subject = "Meet for lunch?";  
ItemBody body = new ItemBody();  
body.contentType = BodyType.TEXT;  
body.content = "The new cafeteria is open.";  
message.body = body;  
LinkedList<Recipient> toRecipientsList = new LinkedList<Recipient>();  
Recipient toRecipients = new Recipient();  
EmailAddress emailAddress = new EmailAddress();  
emailAddress.address = "meganb@contoso.onmicrosoft.com";  
toRecipients.emailAddress = emailAddress;  
toRecipientsList.add(toRecipients);  
message.toRecipients = toRecipientsList;  
LinkedList<Attachment> attachmentsList = new LinkedList<Attachment>();  
FileAttachment attachments = new FileAttachment();  
attachments.name = "attachment.txt";  
attachments.contentType = "text/plain";  
attachments.contentBytes = "SGVsbG8gV29ybGQh";  
attachmentsList.add(attachments);  
message.attachments = attachmentsList;  
  
graphClient.me()  
	.sendMail(message,null)  
	.buildRequest()  
	.post();  

Ref.Link: user-sendmail

But, message.attachments requires AttachmentCollectionPage object not LinkedList<Attachment>();

Can anyone help me to send a mail with multiple attachment.

Thanks

Answer 1

You need to case it to an IMessageAttachmentsCollectionPage (note that you also need to encode ContentBytes):

IMessageAttachmentsCollectionPage Attachments = (IMessageAttachmentsCollectionPage)new List<Attachment>()
{
  new FileAttachment
  {
    Name = "attachment.txt",
    ContentType = "text/plain",
    ContentBytes = Encoding.ASCII.GetBytes("SGVsbG8gV29ybGQh")
  }
}