Item Attachment: A Microsoft 365 item, like another email, a contact, or a calendar event, attached to the message.
In your code, you would then decode the "contentBytes" string to reconstruct the original file. Option B: Downloading the Raw Stream (Recommended)
Using the Microsoft Graph .NET SDK, the process is streamlined. Here is a basic example of how to fetch the content stream of an attachment: download attachment using microsoft graph api
Before writing code, it is important to understand that Microsoft Graph categorizes attachments into three main types:
Mail.ReadBasic: Allows the app to read basic properties of messages and attachments. Mail.ReadWrite: Allows the app to read and modify mail. Item Attachment: A Microsoft 365 item, like another
GET https://microsoft.com{user-id}/messages/{message-id}/attachments
This method is preferred for performance as it avoids the overhead of base64 encoding and decoding. Implementation Example (C# SDK) Here is a basic example of how to
GET https://microsoft.com{user-id}/messages/{message-id}/attachments/{attachment-id}/$value
To download an attachment, you first need the unique ID of the message it belongs to and the ID of the attachment itself. You can list all attachments for a specific message using the following GET request:
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