在bot框架v4中接受瀑布对话框的附件

Question

我试图添加一种功能来接收用户的输入附件，基本上是试图合并bot框架中的handling-attachments bot示例和我的自定义瀑布对话框。

但是您如何在瀑布对话框中访问iturncontext函数？ 。下面是我的代码的说明。

我的瀑布步骤之一：

private async Task<DialogTurnResult> DescStepAsync2(WaterfallStepContext stepContext, CancellationToken cancellationToken)
{


    stepContext.Values["Title"] = (string)stepContext.Result;
    await stepContext.Context.SendActivityAsync(MessageFactory.Text("upload a image"), cancellationToken);

    var activity = stepContext.Context.Activity;
    if (activity.Attachments != null && activity.Attachments.Any())
    {

        Activity reply = (Activity)HandleIncomingAttachment(stepContext.Context.Activity);
        return await stepContext.PromptAsync(nameof(TextPrompt), new PromptOptions { Prompt = reply }, cancellationToken);
    }
    else
    {
        var reply = MessageFactory.Text("else image condition thrown");
        //  reply.Attachments.Add(Cards.GetHeroCard().ToAttachment());
        return await stepContext.PromptAsync(nameof(TextPrompt), new PromptOptions { Prompt = reply }, cancellationToken);
    }
}

[这里是HandleIncomingAttachment函数，我从上面链接的机器人构建器样本中借用了。

private static IMessageActivity HandleIncomingAttachment(IMessageActivity activity)
{
    string replyText = string.Empty;
    foreach (var file in activity.Attachments)
    {
        // Determine where the file is hosted.
        var remoteFileUrl = file.ContentUrl;

        // Save the attachment to the system temp directory.
        var localFileName = Path.Combine(Path.GetTempPath(), file.Name);

        // Download the actual attachment
        using (var webClient = new WebClient())
        {
            webClient.DownloadFile(remoteFileUrl, localFileName);
        }

        replyText += $"Attachment \"{file.Name}\"" +
                     $" has been received and saved to \"{localFileName}\"\r\n";
    }

    return MessageFactory.Text(replyText);
}

以下是对话的笔录：

编辑：我已经为此编辑了代码，它仍然不等我上传附件。只需完成此步骤即可。

private async Task<DialogTurnResult> DescStepAsync2(WaterfallStepContext stepContext, CancellationToken cancellationToken)
{
    stepContext.Values["Desc"] = (string)stepContext.Result;
    var reply = (Activity)ProcessInput(stepContext.Context);
    return await stepContext.PromptAsync(nameof(AttachmentPrompt), new PromptOptions { Prompt = reply }, cancellationToken);
}

过程输入功能：

private static IMessageActivity ProcessInput(ITurnContext turnContext)
{
    var activity = turnContext.Activity;
    IMessageActivity reply = null;

    if (activity.Attachments != null && activity.Attachments.Any())
    {
        // We know the user is sending an attachment as there is at least one item .
        // in the Attachments list.
        reply = HandleIncomingAttachment(activity);
    }
    else
    {
        reply = MessageFactory.Text("No attachement detected ");
        // Send at attachment to the user.              
    }
    return reply;
}

Answer 1

A WaterfallStepContext继承自WaterfallStepContext，因此可以通过其DialogContext属性访问ITurnContext。您发布的瀑布步骤代码在使用Context或Context时已经执行了此操作。