Question

我试图在Bot框架中的两个对话框之间传递IList<Attachment>类型的对象。以下是我的代码现在的样子：

主对话框：

[Serializable]
public class CarouselCardsDialog : IDialog<object>
{
    public async Task StartAsync(IDialogContext context)
    {
        context.Wait(this.MessageReceivedAsync);
    }

    public virtual async Task MessageReceivedAsync(IDialogContext context, IAwaitable<IMessageActivity> result)
    {
        //This object, 'attachments' is what I need to pass to the child dialog.
        IList<Attachment> attachments = GetCardsAttachments();
        context.Call(new CarouselDialog(attachments), ResumeAfterPrompt);
    }

    private async Task ResumeAfterPrompt(IDialogContext context, IAwaitable<string> result)
    {
        string input = await result;
        await context.PostAsync(input);
        context.Wait(MessageReceivedAsync);
    }

    private static IList<Attachment> GetCardsAttachments()
    {
        //Get a list of attachment
    }
}

这是子对话框。我想将CarouselCardsDialog中的附件列表传递给此对象：

[Serializable]
public class CarouselDialog : IDialog<string>
{
    private IList<Attachment> _attachments;

    public CarouselDialog(IList<Attachment> attachments)
    {
        _attachments = attachments;
    }

    public async Task StartAsync(IDialogContext context)
    {
        IMessageActivity reply = context.MakeMessage();
        reply.AttachmentLayout = AttachmentLayoutTypes.Carousel;
        reply.Attachments = _attachments;
        await context.PostAsync(reply);
        context.Wait(MessageReceivedAsync);
    }

    public virtual async Task MessageReceivedAsync(IDialogContext context, IAwaitable<IMessageActivity> result)
    {
        IMessageActivity activity = await result;
        context.Done(activity.Text);
    }
}

然而，当我运行此代码时，我收到此错误：

例外：输入＆＃39; Microsoft.Bot.Connector.Attachment＆＃39;在大会＆＃39; Microsoft.Bot.Connector，Version = 3.5.1.0，Culture = neutral，公钥= 31bf3856ad364e35＆＃39;未标记为可序列化。

我做错了什么？有办法解决这个问题吗？

Answer 1

不确定异常，但解决方法是为您创建附件所需的所有数据创建模型，然后将此数据保存在上下文的UserData属性中。

context.UserData.SetValue<MyModel>("AttachmentsModel", instanceOfModel);

然后在第二个对话框中检索此模型

MyModel model;
context.UserData.TryGetValue<MyModel>("AttachmentsModel", out model);

我认为你也可以尝试在这个属性中放置一个IAttachment对象，但是模型会更好，因为它并不是真的用来容纳大对象。

如何在Microsoft Bot Framework中的对话框之间传递对象？

1 个答案: