Bot Framework：方法在尝试等待值后退出

Question

我似乎在使用 IAwaitable 时遇到了一些问题。我有以下对话框

[Serializable]
public class SearchDialog : IDialog<object>
{
    private SpotifyClient _client;

    public SearchDialog()
    {
        _client = new SpotifyClient();
    }

    public async Task StartAsync(IDialogContext context)
    {
        await context.PostAsync("Please enter the name of the artist");
        context.Wait<string>(MessageReceived);
    }

    public async Task MessageReceived(IDialogContext context, IAwaitable<string> activity)
    {
        var message = await activity;

        var results = await _client.SearchForArtistAsync(message);

        if(results != null && results.Artists.Results.Any())
        {
            var artists = results.Artists.Results.Select(x => x.Name); // List<string>

            PromptDialog.Choice(context,
                ChoiceSelectAsync,
                artists,
                string.Empty,
                "Didn't get that",
                3,
                PromptStyle.PerLine);
        }
    }

    public async Task ChoiceSelectAsync(IDialogContext context, IAwaitable<string> choice)
    {
        var chosenArtist = await choice;

        await context.PostAsync($"You have chosen {chosenArtist}");

        context.Wait<string>(ChoiceSelectAsync);
    }
}

问题是，提示对话框永远不会显示。 MessageReceived 方法似乎试图等待活动，但随后退出该方法。如果我使用 await 关键字，为什么它不等待结果？任何帮助将不胜感激。

Answer 1

MessageReceived 方法的签名错误。它应该是 IAwaitable<MessageActivity> 而不是 IAwaitable<string>

public async Task MessageReceived(IDialogContext context, IAwaitable<IMessageActivity> activity)

完成此操作后，您还需要将context.Wait 调用更新为context.Wait(MessageReceived);

然后，要访问用户发送的文本，只需检查等待消息的Text 属性：

  var message = await activity;

  var results = await _client.SearchForArtistAsync(message.Text);