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Bot FrameworkでBotの方から話しかける(C#)

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やりたいこと

BotFrameworkでBot開発をするときチャットを開始したらBot側から話しかけれくれるようにしたい。

結果

本当はNode.jsで開発したかったが実装方法はわからずじまい・・・。
C#でBotFrameworkテンプレートでソリューションを作りチャットを開始すると、Activity型の引数のTypeがConversationUpdateとなってHandleSystemMessageに来るのでそこでメッセージを生成して送信する。

コード

private async Task<Activity> HandleSystemMessage(Activity message)
{
    if (message.Type == ActivityTypes.ConversationUpdate)
    {
      using (var scope = DialogModule.BeginLifetimeScope(Conversation.Container, message))
      {
        var client = scope.Resolve<IConnectorClient>();
        var reply = message.CreateReply();
        reply.Text = $"Welcome!";
        await client.Conversations.ReplyToActivityAsync(reply);                 
      }
    }

    return null;
}

 最後に

例によって試行錯誤したらこのような結果になったという備忘録なので、この方法が正攻法かはわかりません。

2017/08/08追記
Microsoftから正式なやり方がリリースされました!
https://docs.microsoft.com/en-us/bot-framework/dotnet/bot-builder-dotnet-proactive-messages

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