如何在C#中用MS bot框架开发的网络频道聊天机器人中显示横幅？

using Microsoft.Bot.Builder;
using Microsoft.Bot.Builder.Teams;
using Microsoft.Bot.Schema;

// 在适当的位置调用以下代码来显示横幅
var bannerCard = new HeroCard
{
    Title = "横幅标题",
    Text = "横幅内容",
    Images = new List<CardImage> { new CardImage("横幅图片URL") },
};

var bannerAttachment = new Attachment
{
    ContentType = HeroCard.ContentType,
    Content = bannerCard,
};

var activity = MessageFactory.Attachment(bannerAttachment);
await turnContext.SendActivityAsync(activity);

using Microsoft.Bot.Builder.Teams;

// 在适当的位置调用以下代码来处理Teams特定的功能
var teamsChannelData = turnContext.Activity.GetChannelData<TeamsChannelData>();
if (teamsChannelData != null && teamsChannelData.Channel != null && teamsChannelData.Channel.Id != null)
{
    var teamsChannelId = teamsChannelData.Channel.Id;
    var teamsTeamId = teamsChannelData.Team.Id;
    
    // 在此处可以根据需要执行特定于Teams的操作，例如发送横幅到特定的团队或频道
}