如何在 C# 中使用 AWS Lambda 发送响应卡答案

【问题标题】：How to send a response card using AWS Lambda in C#如何在 C# 中使用 AWS Lambda 发送响应卡
【发布时间】：2020-09-27 02:31:29
【问题描述】：

您好，我正在亚马逊 lex 上开发一个聊天机器人，我想使用 lambda 函数发送响应卡，但是在关闭响应格式中使用响应卡函数时，它会给出空异常的错误。谁能告诉它的解决方案？ PS 我使用的是 Nikki 创建的 FlowerOrder 蓝图。

if (slots[greet] != null) 
        {

            var validateGreet = ValidateUserGreeting(slots[greet]);
            if (validateGreet.IsValid) 
            {
                return Close(sessionAttributes,
                              "Fulfilled",
                              new LexResponse.LexMessage
                              {
                                  ContentType = "PlainText",
                                  Content = String.Format("Hello Kindly choose one option")
                              },
                              new LexResponse.LexResponseCard
                              {
                                  Version = 1,
                                  ContentType = "application/vnd.amazonaws.card.generic",
                                  GenericAttachments =
                                  {
                                  new LexResponse.LexGenericAttachments
                                  {
                                      Buttons =
                                      {
                                         new LexResponse.LexButton
                                         {
                                             Text = "Shop Now",
                                             Value = "Shop Now"
                                         }
                                      },
                                      AttachmentLinkUrl = null,
                                      Title = "Shopping",
                                      SubTitle = "Sub Shopping",
                                      ImageUrl = null
                                  }
                                  }
                              }
                              );
            }

例外：-

2020-06-09 17:31:20：对象引用未设置为对象的实例。：D:\AWS Project\Abbrar Projects\ 中 EVS_Test_Abbar_Lambda_Function.OrderWatchIntentProcessorTest.Process(LexEvent lexEvent, ILambdaContext context) 处的 NullReferenceException EVS_Test_Abbar_Lambda_Function\EVS_Test_Abbar_Lambda_Function\OrderWatchIntentProcessorTest.cs：第 52 行 EVS_Test_Abbar_Lambda_Function.Function.FunctionHandler(LexEvent lexEvent, ILambdaContext context) in D:\AWS Project\Abbrar Projects\EVS_Test_Abbar_Lambda_Function\EVS_Test_Abbar_Lambda_Function\F 在 lambda_method(Closure , Stream , Stream , LambdaContextInternal )

【问题讨论】：

请发布您的堆栈跟踪，以便我们查看它不喜欢什么

标签： c# aws-lambda chatbot aws-lex aws-sdk-net

【解决方案1】：

这是它的解决方案，因为如果您查看 JSON 的结构，它包含许多模型和列表，并且每个都必须单独处理。

LexResponse.LexResponseCard lexResponseCard = new LexResponse.LexResponseCard();

    List<LexResponse.LexGenericAttachments> ListlexGenericAttachments = new List<LexResponse.LexGenericAttachments>();
    LexResponse.LexGenericAttachments lexGenericAttachments = new LexResponse.LexGenericAttachments();



    List<LexResponse.LexButton> ListlexButton = new List<LexResponse.LexButton>();
    LexResponse.LexButton lexButton = new LexResponse.LexButton();



    lexButton.Text = "Yes Now";
    lexButton.Value = "Yes";
    ListlexButton.Add(lexButton);
    lexGenericAttachments.AttachmentLinkUrl = "Link";
    //lexGenericAttachments.AttachmentLinkUrl = null;
    lexGenericAttachments.Title = "Shopping";
    lexGenericAttachments.SubTitle = "Sub Shopping";
    lexGenericAttachments.ImageUrl = "Link";
    //lexGenericAttachments.ImageUrl = null;
    lexGenericAttachments.Buttons = ListlexButton;



    ListlexGenericAttachments.Add(lexGenericAttachments);



    lexResponseCard.Version = 0;
    lexResponseCard.ContentType = "application/vnd.amazonaws.card.generic";
    lexResponseCard.GenericAttachments = ListlexGenericAttachments;



    return Close(sessionAttributes,
                      "Fulfilled", 
                      new LexResponse.LexMessage
                      {
                          ContentType = "PlainText",
                          Content = String.Format("Hello Kindly choose one option")
                      },
                      lexResponseCard
                      );

【讨论】：

【解决方案2】：

只尝试一张 Lex 响应卡。

    return Close(sessionAttributes,
    "Fulfilled"
    new LexResponse.LexResponseCard
    {
        version = 1,
        contentType = "application/vnd.amazonaws.card.generic",
        GenericAttachments =
        {
                new LexResponse.LexGenericAttachments
                {
                    Buttons =
                    {
                        new LexResponse.LexButton
                        {
                            text = "Shop Now",
                            value = "Shop Now"
                        }
                    },
                    attachmentLinkUrl = null,
                    title = "Shopping",
                    subTitle = "Sub Shopping",
                    imageUrl = null
                }
        }
    }
);

【讨论】：

【解决方案3】：

这可能是您对键名的大写。例如你有ContentType，但它应该是contentType，以小写字母开头。

return Close(sessionAttributes,
    "Fulfilled",
    new LexResponse.LexMessage
    {
        contentType = "PlainText",
        content = String.Format("Hello Kindly choose one option")
    },
    new LexResponse.LexResponseCard
    {
        version = 1,
        contentType = "application/vnd.amazonaws.card.generic",
        GenericAttachments =
        {
                new LexResponse.LexGenericAttachments
                {
                    Buttons =
                    {
                        new LexResponse.LexButton
                        {
                            text = "Shop Now",
                            value = "Shop Now"
                        }
                    },
                    attachmentLinkUrl = null,
                    title = "Shopping",
                    subTitle = "Sub Shopping",
                    imageUrl = null
                }
        }
    }
);

【讨论】：