C# 捕捉卡片按钮单击活动。文本为空

我已经创建了一张新卡。当用户单击按钮时，应该会捕捉到

 var card = new HeroCard
                {
                    Title = "Welcome ",
                    Text = "Click the buttons below to update this card",
                    Buttons = new List<CardAction>
                    {
                        new CardAction
                        {
                            Type= ActionTypes.MessageBack,
                            Title = "Update Card",
                            Text = "UpdateCardAction",
                            DisplayText = "UpdateCardAction",
                            Value =  new JObject { { "count", 0 } }
                        },
                        new CardAction(ActionTypes.OpenUrl, "Get an overview", null, "Get an overview", "Get an overview", "https://docs.microsoft.com/en-us/azure/bot-service/?view=azure-bot-service-4.0"),

                    }
                };

                await turnContext.SendActivityAsync(MessageFactory.Attachment(card.ToAttachment()));

var卡=新卡
{
Title=“欢迎”，
Text=“单击下面的按钮更新此卡”，
按钮=新列表
{
新名片
{
Type=ActionTypes.MessageBack，
Title=“更新卡”，
Text=“UpdateCardAction”，
DisplayText=“UpdateCardAction”，
值=新作业对象{{“计数”，0}
},
新的CardAction（ActionTypes.OpenUrl，“获取概览”，null，“获取概览”，“获取概览”https://docs.microsoft.com/en-us/azure/bot-service/?view=azure-bot-service-4.0“，
}
};
等待turnContext.SendActivityAsync（MessageFactory.Attachment（card.ToAttachment（））；

检查按钮的方法

messageActivityAsync上的受保护覆盖异步任务（iTurContext turnContext，CancellationToken CancellationToken）
{
turnContext.Activity.RemoveRecipientTitle（）；
开关（turnContext.Activity.Text.Trim（））
{
................

问题

---

然而，当用户单击按钮时，它不会被捕获，因为turnContext.Activity.Text始终为空。

当使用ActionTypes.MessageBack时，我们似乎无法获得Text属性

 var card = new HeroCard
                {
                    Title = "Welcome ",
                    Text = "Click the buttons below to update this card",
                    Buttons = new List<CardAction>
                    {
                        new CardAction
                        {
                            Type= ActionTypes.MessageBack,
                            Title = "Update Card",
                            Text = "UpdateCardAction",
                            DisplayText = "UpdateCardAction",
                            Value =  new JObject { { "count", 0 } }
                        },
                        new CardAction(ActionTypes.OpenUrl, "Get an overview", null, "Get an overview", "Get an overview", "https://docs.microsoft.com/en-us/azure/bot-service/?view=azure-bot-service-4.0"),

                    }
                };

                await turnContext.SendActivityAsync(MessageFactory.Attachment(card.ToAttachment()));

• 要获取值，您可以通过转到turnContext.Activity.value来访问它，在本例中，它将是作业对象{{“count”，0}
• 如果希望获得显示文本，可以执行以下操作

  var channelData=JObject.FromObject（turnContext.Activity.channelData）；
  var displayText=channelData[“messageBack”][“displayText”].ToString（）；