有没有办法在机器人框架中接受文件作为附件？

Question

我已在 Microsoft 团队中发布了我的机器人。现在我想包含一个功能，用户可以将文件作为附件上传，bot 会将其上传到 blob 存储，如何在 bot 框架中处理这个问题？

Answer 1

用户发送的附件最终会出现在 IMessageActivity 的Attachments 集合中。您将在此处找到用户发送的附件的 URL。

然后，您必须下载附件并添加逻辑以将其上传到 Blob 存储或您想使用的任何其他存储。

Here 是一个 C# 示例，展示了如何访问和下载用户发送的附件。添加以下代码供您参考：

public virtual async Task MessageReceivedAsync(IDialogContext context, IAwaitable<IMessageActivity> argument)
{
    var message = await argument;

    if (message.Attachments != null && message.Attachments.Any())
    {
        var attachment = message.Attachments.First();
        using (HttpClient httpClient = new HttpClient())
        {
            // Skype attachment URLs are secured by a JwtToken, so we need to pass the token from our bot.
            if (message.ChannelId.Equals("skype", StringComparison.InvariantCultureIgnoreCase) && new Uri(attachment.ContentUrl).Host.EndsWith("skype.com"))
            {
                var token = await new MicrosoftAppCredentials().GetTokenAsync();
                httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
            }

            var responseMessage = await httpClient.GetAsync(attachment.ContentUrl);

            var contentLenghtBytes = responseMessage.Content.Headers.ContentLength;

            await context.PostAsync($"Attachment of {attachment.ContentType} type and size of {contentLenghtBytes} bytes received.");
        }
    }
    else
    {
        await context.PostAsync("Hi there! I'm a bot created to show you how I can receive message attachments, but no attachment was sent to me. Please, try again sending a new message including an attachment.");
    }

    context.Wait(this.MessageReceivedAsync);
}