“data-streamdown=” is a property/parameter used in MailBee.NET Objects (an email-handling library for .NET) that controls how message body or attachment data is written to an output stream during operations like downloading, saving, or processing message content.
Key points (concise):
- Purpose: Directs MailBee to stream message content from the mailbox/server into a provided output stream (instead of buffering entire content in memory or returning it as a string/byte array). This is useful for large messages/attachments to reduce memory usage.
- Typical usage: You pass an open Stream (e.g., FileStream, MemoryStream) to a method or set a parameter named data-streamdown (or similarly named property depending on API version) so the library writes raw message/attachment bytes into that stream as it downloads.
- Benefits:
- Low memory footprint for large attachments or messages.
- Enables writing directly to files or processing pipelines.
- Can improve performance by avoiding extra copies.
- Behavior and options:
- The stream should be writable and remain open until the operation completes.
- Some APIs may accept null to skip streaming or use internal buffering.
- There may be settings to control chunk size, encoding/decoding (e.g., base64/quopri), and whether decoding happens on the fly.
- Error handling: library methods usually throw exceptions on stream write failures; callers should close/dispose streams in finally blocks.
- Common scenarios:
- Downloading attachments to disk using a FileStream.
- Piping decoded message parts into processors without intermediate files.
- Implementing resumable or chunked downloads if supported.
If you want, tell me which MailBee.NET class/method or code language (.NET Framework/Core, C# or VB.NET) you’re using and I’ll provide a short example showing how to stream a message part to a FileStream.
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