步驟 2.在專案中新增和更改程式碼

1. 開啟 Function.cs 並用以下程式碼替換類程式碼：

   public class Function
   {
   
   /// <summary>
   /// A simple function that takes a birth date and returns Age in years
   /// </summary>
   /// <param name="input"></param>
   /// <returns>Age is years</returns>
   /// 
   [LambdaSerializer(typeof(SimpleSerializer))]
   public string FunctionHandler(Dictionary<string, int> input)
   {
       var defaultMessage = "Age could not be determined.";
   
       var birthDate = new DateTime(input["year"], input["month"], input["day"]);
       var ageInYears = DateTime.Today.Year - birthDate.Year;
       if (birthDate.DayOfYear > DateTime.Today.DayOfYear)
           ageInYears--;
   
       defaultMessage = $"Age in years: {ageInYears}";
   
       return defaultMessage;
   }
   }
   

你需要在頂部附近新增以下使用語句：

using System.Collections.Generic;
using Amazon.Lambda.Core;

2. 將檔案新增到名為 SimpleSerializer.cs 的專案中
3. 將以下程式碼放在該檔案中：

using System;

using System.IO;
using Amazon.Lambda.Core;
using Newtonsoft.Json;

namespace AWSLambdaFunctionAgeInYears
{
public class SimpleSerializer : ILambdaSerializer
{
    public T Deserialize<T>(Stream requestStream)
    {
        string text;
        using (var reader = new StreamReader(requestStream))
            text = reader.ReadToEnd();

        try
        {
            return JsonConvert.DeserializeObject<T>(text);
        }
        catch (Exception ex)
        {
            if (typeof(T) == typeof(System.String))
                return (T)Convert.ChangeType(text, typeof(T));

            throw ex;
        }

    }

    public void Serialize<T>(T response, Stream responseStream)
    {
        StreamWriter streamWriter = new StreamWriter(responseStream);
        try
        {
            string text = JsonConvert.SerializeObject(response);
            streamWriter.Write(text);
            streamWriter.Flush();
        }
        catch (Exception ex)
        {
            if (typeof(T) == typeof(System.String))
            {
                streamWriter.Write(response);
                streamWriter.Flush();
                return;
            }

            throw ex;
        }

    }
}
}

4. 在測試專案中，將 FunctionTest.cs 的第 23 行更改為以下內容：

           var upperCase = function.FunctionHandler(null);
   

5. 構建你的解決方案 - 你應該沒有構建錯誤。