private async Task <Activity> HandleSystemMessage(Activity message)
{
if (message.Type == ActivityTypes.DeleteUserData)
{
// Implement user deletion here
// If we handle user deletion, return a real message
}
else if (message.Type == ActivityTypes.ConversationUpdate)
{
// Handle conversation state changes, like members being added and removed
// Use Activity.MembersAdded and Activity.MembersRemoved and Activity.Action for info
// Not available in all channels
for (int i = 0; i < message.MembersAdded.Count; i++)
{
if (message.MembersAdded[i].Id == message.Recipient.Id)
{
// Bot is added. Let's send welcome message.
var connectorClient = new ConnectorClient(new Uri(message.ServiceUrl));
ThumbnailCard card = RootDialog.GetHelpMessage();
var reply = message.CreateReply();
reply.TextFormat = TextFormatTypes.Xml;
reply.Attachments.Add(card.ToAttachment());
await connectorClient.Conversations.ReplyToActivityAsync(reply);
break;
}
}
}
else if (message.Type == ActivityTypes.ContactRelationUpdate)
{
// Handle add/remove from contact lists
// Activity.From + Activity.Action represent what happened
}
else if (message.Type == ActivityTypes.Typing)
{
// Handle knowing that the user is typing
}
else if (message.Type == ActivityTypes.Ping)
{
}
return(null);
}