我现在正在使用 Microsoft Bot Builder .NET SDK 通过模拟器接收附件

Question

我正在为我的项目使用 Microsoft 的 Bot builder SDK for .NET，我想从 Emulator 接收附件并继续流程。

当我从模拟器附加任何文件时，我遇到了问题，我没有上传文件的内容，并且内容 URL 也是一些我无法继续的本地主机 URL。

代码：

public virtual async Task MessageReceivedAsync(IDialogContext context, IAwaitable<IMessageActivity> result)
{
    var message = await result;
    var reply = context.MakeMessage();
}

var message 中附件的值：

我的问题是如何获取我上传的文件的内容和内容 URL。

Answer 1

你不会得到内容。 Yoy 需要使用 ContentUrl 下载它。查看core-ReceiveAttachment 示例以了解如何操作。

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 & MS Teams attachment URLs are secured by a JwtToken, so we need to pass the token from our bot.
            if ((message.ChannelId.Equals("skype", StringComparison.InvariantCultureIgnoreCase) || message.ChannelId.Equals("msteams", 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);
}