Microsoft Bot Framework：从数据库向用户广播消息

Question

情况：当用户注册机器人时（通过向机器人输入消息，我将该用户的信息存储在数据库中： - 用户身份 - 用户名， - 服务网址

在某个时间点，我想让我的机器人向该表中的所有用户广播一条消息。

foreach (var bUsers in users)
{
MicrosoftAppCredentials.TrustServiceUrl(bUsers.ServiceUrl);
                        MicrosoftAppCredentials creds = new MicrosoftAppCredentials("<<appid>>", "<<secret>>");
                        var connector = new ConnectorClient(new Uri(bUsers.ServiceUrl), creds);
                        var conversationId = await connector.Conversations.CreateDirectConversationAsync(new ChannelAccount(), new ChannelAccount(bUsers.UserId, bUsers.UserName));
                        message = Activity.CreateMessageActivity();
                        message.From = botAccount;
                        message.Recipient = userAccount;
                        message.Conversation = new ConversationAccount(id: conversationId.Id);
                        message.Text = "Hello from " + context.Activity.From.Name;
                        message.Locale = "en-Us";
                        var reply = await connector.Conversations.SendToConversationAsync((Activity) message);
}

使用此代码，我收到一条消息：

teamChannelId 中的对话 ID 无效

我不明白这个消息，甚至可以做我想做的事吗？

Answer 1

我在做几乎和你一样的事情，但它突然停止工作了。我可以看到相同的错误消息。

但就我而言，这是错误的，也许它一开始就奏效了，这很奇怪。因为我使用了client.UserId，它被设置为activity.Conversation.Id。如果我更改代码以将其用作conversationId，它就可以工作。

这是我现在正在运行的代码，旧部分已被注释掉：

    public static async Task SendMessageToClient(ServerClient client, string messageText)
    {
        var connector = new ConnectorClient(new Uri(client.BotServiceUrl), new MicrosoftAppCredentials());
        var userAccount = new ChannelAccount(name: client.UserName, id: client.UserId);
        var botAccount = new ChannelAccount(name: client.BotName, id: client.BotId);
        // this worked before but not anymore
        //var conversationId = await connector.Conversations
        //       .CreateDirectConversationAsync(botAccount, userAccount).Id;

        // because client.UserId was set in a MessageController to activity.Conversation.Id we can use this
        var conversationId = client.UserId; 
        var message = Activity.CreateMessageActivity();
        message.From = botAccount;
        message.Recipient = userAccount;
        message.Conversation = new ConversationAccount(false, conversationId);
        message.Locale = "en-Us";
        if (client.ReplaceFrom != null && client.ReplaceTo != null)
        {
            messageText = messageText.Replace(client.ReplaceFrom, client.ReplaceTo);
        }
        message.Text = messageText;
        await connector.Conversations.SendToConversationAsync((Activity) message);
    }