using System;

using System.Collections.Specialized;

using System.IO;

using System.Net;

using System.Text;

using System.Web;

​

public class Book {

    public string name {get;set;}

    public string id {get;set;}

    public string no {get;set;}

}

​

public class Program

{

    public static void Main()

    {

        Check(new Book(){ name="Top945", id="273902", no="390" });

        Check(new Book(){ name="科學少年", id="300120", no="57" });

        Check(new Book(){ name="少年牛頓", id="273912", no="181" });

        Check(new Book(){ name="未來少年", id="274477", no="106" });

        Console.WriteLine("Done @"+DateTime.Now.ToString());

    }

    private static void Check(Book book){

        string url = "https://webpac.hcml.gov.tw/webpac/modules/WPSJReleaseListAjaxPage.do";

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

        request.Method = "POST";

        request.ContentType = "application/x-www-form-urlencoded";

        NameValueCollection postParams = HttpUtility.ParseQueryString(string.Empty);

        postParams.Add("id", book.id);

        postParams.Add("YNum", book.no);

        byte[] byteArray = Encoding.UTF8.GetBytes(postParams.ToString()); 

        using (Stream reqStream = request.GetRequestStream())

        {

            reqStream.Write(byteArray, 0, byteArray.Length);

        }

        //API回傳的字串

        string responseStr = "";

        //發出Request

        using (WebResponse response = request.GetResponse())

        { 

            using (StreamReader sr = new StreamReader(response.GetResponseStream(),Encoding.UTF8))

            {

                responseStr = sr.ReadToEnd();

            }//end using  

        }

        if(responseStr.IndexOf("value=\"預約\"")>0) {

            Console.WriteLine(string.Format("{0} no. {1} is orderable! url=>https://webpac.hcml.gov.tw/webpac/bookDetail.jsp?id={2}", book.name, book.no, book.id));

        }

    }

}