Amazon Product Advertising API Sample

gistfile1.cs

using System;
using System.Linq;
using System.Xml.Linq;

namespace AmazonProductAdvtApi
{
    class ItemLookupSample
    {
        private const string MY_AWS_ACCESS_KEY_ID = "{Access Key ID}";
        private const string MY_AWS_SECRET_KEY = "{Secret Access Key}";
        private const string DESTINATION = "ecs.amazonaws.jp";
        private const string ASSOCIATE_TAG = "{アソシエイトタグ}";

        public static void Main()
        {
            var helper = new SignedRequestHelper(MY_AWS_ACCESS_KEY_ID, MY_AWS_SECRET_KEY, DESTINATION, ASSOCIATE_TAG);

            var keyword = "納品のない受託開発";

            String requestString = "Service=AWSECommerceService"
                + "&Version=2009-03-31"
                + "&Operation=ItemSearch"
                + "&SearchIndex=Books"
                + "&ResponseGroup=Medium"
                + "&Keywords=" + keyword
                ;
            var requestUrl = helper.Sign(requestString);
            var title = FetchTitle(requestUrl);

            Console.WriteLine("Keyword=\"" + keyword + "\"; Title=\"" + title + "\"");
            Console.WriteLine();

            Console.WriteLine("Hit Enter to end");
            Console.ReadLine();
        }

        private static string FetchTitle(string url)
        {
            XDocument xml = XDocument.Load(url);

            var ns = xml.Root.Name.Namespace;
            var errorMessageNodes = xml.Descendants(ns + "Message").ToList();
            if (errorMessageNodes.Any())
            {
                var message = errorMessageNodes[0].Value;
                return "Error: " + message;
            }

            var title = xml.Descendants(ns + "Title").First();
            return title.Value;
        }
    }
}