请求编写基于BotBuilder Samples的指定User ID单用户消息发送函数

Got it, let's break this down based on the Teams Conversation Bot sample you're working with. The _message_all_members method loops through all conversation members, but we can adapt that logic to target a single user by their ID.

Here's a complete, ready-to-use function you can add to your TeamsConversationBot class (right alongside the existing _message_all_members method):

async def _send_message_to_single_user(
    self,
    turn_context: TurnContext,
    text_message: str,
    target_user_id: str
) -> None:
    """
    Sends a proactive direct message to a specific user in the current Teams conversation.
    :param turn_context: Context object with details about the current interaction.
    :param text_message: The text content to send to the user.
    :param target_user_id: The unique Teams User ID of the recipient.
    """
    # Pull core bot dependencies from the turn context (matches sample pattern)
    adapter = turn_context.adapter
    bot_app_id = turn_context.activity.recipient.id

    try:
        # Get the base conversation reference to anchor the proactive message
        conversation_reference = TurnContext.get_conversation_reference(turn_context.activity)

        # Fetch all members in the current conversation (same as the sample's member lookup)
        members = await TeamsInfo.get_members(turn_context)

        # Filter members to find the target user by ID
        target_member = next((member for member in members if member.id == target_user_id), None)
        if not target_member:
            await turn_context.send_activity(f"Error: User with ID {target_user_id} not found in this conversation.")
            return

        # Create the message activity and update the conversation reference to target the user
        message_activity = MessageFactory.text(text_message)
        proactive_ref = TurnContext.get_conversation_reference(turn_context.activity)
        proactive_ref.user = target_member

        # Send the proactive message using the adapter (same method the sample uses for bulk messages)
        await adapter.continue_conversation(
            bot_app_id,
            proactive_ref,
            lambda ctx: ctx.send_activity(message_activity),
            None
        )

        await turn_context.send_activity(f"Successfully sent message to user {target_user_id}.")

    except Exception as e:
        # Catch and report any errors during message sending
        await turn_context.send_activity(f"Failed to send message: {str(e)}")

How this works (aligned with the sample's structure): #

1. Reuse sample dependencies: We grab the adapter and bot ID from the turn context, just like _message_all_members does—this keeps consistency with the sample's logic.
2. Anchor to the conversation: The conversation reference tells Teams where to route the proactive message (the team/channel context).
3. Find the target user: We fetch all conversation members (using TeamsInfo.get_members() as the sample does) and filter for the user with your provided ID.
4. Target the user specifically: We update the conversation reference to point directly to the target user, ensuring the message goes to their direct chat with the bot.
5. Send the message: We use adapter.continue_conversation()—the same method the sample uses for bulk messages—to send the proactive message to the single user.

Example usage: #

Call this function from a message handler in your bot, like so:

async def on_message_activity(self, turn_context: TurnContext) -> None:
    # Trigger the direct message when a specific command is received
    if turn_context.activity.text.lower() == "dm_user":
        # Replace with your target user's actual Teams ID
        target_user = "<YOUR_TARGET_USER_ID>"
        message = "Hey there! This is a private message just for you from the bot."
        await self._send_message_to_single_user(turn_context, message, target_user)
    else:
        await turn_context.send_activity("Try sending 'dm_user' to test the direct message function!")

Quick notes: #

• Make sure your Teams app manifest has permissions for proactive messaging (the sample's manifest already includes this, but double-check if you've modified it).
• If you don't have the user's ID, log the member.id values from TeamsInfo.get_members() to retrieve it.

内容的提问来源于stack exchange，提问作者Alexei Masterov