C# 我们无法通过Bot应用程序从英雄卡的行动中获取所选卡值

问题：我们无法从机器人应用程序中英雄卡的操作中获取所选卡值

代码：

string val=message.Text//每次选中卡片按钮后该值为空。
ResultInCSV=URL；
Activity replyToConversation=（Activity）context.MakeMessage（）；
RootObjects holder=JsonConvert.DeserializeObject（ResultInCSV）；
列表<附件>a=新列表<附件>（）；
附件附加=新附件（）；
对于（int v=0；v

您在哪个频道有问题？@Nicolas R网络聊天频道您在哪个频道有问题？@Nicolas R网络聊天频道

string val = message.Text; //this value every time coming null after selected card button.

ResultInCSV = URL;
Activity replyToConversation = (Activity) context.MakeMessage();
RootObjects holder = JsonConvert.DeserializeObject < RootObjects > (ResultInCSV);
List < Attachment > a = new List < Attachment > ();
Attachment attach = new Attachment();
for (int v = 0; v < holder.VehicleListsResult.Count; v++) {
    attach = GetHeroCard(
        holder.VehicleListsResult[v].Name,
        "",
        holder.VehicleListsResult[v].ID.ToString(),
        new CardImage(url: holder.VehicleListsResult[v].ImagePath),
        new CardAction(ActionTypes.ImBack, holder.VehicleListsResult[v].Description, value: holder.VehicleListsResult[v].ID.ToString()));
    a.Add(attach);
}

replyToConversation.AttachmentLayout = AttachmentLayoutTypes.Carousel;
replyToConversation.Attachments = a;
await context.PostAsync(replyToConversation);