Problem with obtaining SenderId

[cherryymerryy]

How to convert SenderId with TdApi.MessageSender type to long type?

[ForNeVeR]

Depending on its type (MessageSenderChat or MessageSenderUser), pick the property UserId or ChatId.

Something like this:

// MessageSender sender
long id = sender switch {
  MessageSenderChat c => c.ChatId,
  MessageSenderUser u => u.UserId,
  _ => throw new Exception("oops")
};