Detecting and receiving attachments with your Bot

gistfile1.txt

if (activity.Attachments?.Count() > 0)
{
    var imageCount = activity.Attachments.Count(a => a.ContentType.Contains("image"));

    if (imageCount > 0)
    {
        // Notify user that we got something
        var message = imageCount == 1 ? $"You've sent 1 image" : $"You've sent {imageCount} images";
        var imageReply = activity.CreateReply(message);
        await connector.Conversations.ReplyToActivityAsync(imageReply);
    }

    foreach (var attachment in activity.Attachments.Where(a => a.ContentType.Contains("image")))
    {
        // ... Handle your attachment here
    }
}