じゃらんＡＰＩを使って、特定ホテルの空室を調べる（部屋情報を出力）

かなり手抜きだけど、ひとまずメモということで。後日修正版を書き直す。

  protected void btnSearch_Click(object sender, EventArgs e)
  {
    const string strUrlFormat = "http://jws.jalan.net/APIAdvance/StockSearch/V1/?key={0}&h_id={1}&stay_date={2:yyyyMMdd}&stay_count={3}";

    const string strApiKey = "ＡＰＩキー";
    const string strHotelKey = "ホテルＩＤ";
    const int numStayCount = 1;
    string strStayDate = "20100129";    //検索したい日付
    string strUrl = String.Format(strUrlFormat, strApiKey, strHotelKey, strStayDate, numStayCount);
    linkUrl.NavigateUrl = strUrl;


    panelResult.Visible = true;
    lblResult.Text = "";

    XmlTextReader reader = null;
    try
    {
      reader = new XmlTextReader(strUrl);

      while (reader.Read())
      {
        if (reader.NodeType == XmlNodeType.Element)
        {
          string strValue = reader.ReadString();

          int numStock = -1;
          string strStock = "";

          switch (reader.LocalName)
          {
            case "RoomName"://部屋名
              lblResult.Text += String.Format("[{0}]
", strValue);
              break;
            case "RateType"://料金タイプ（大人１名あたり）
              lblResult.Text += String.Format("  {0}", strValue);
              break;
            case "Rate"://１室１泊あたりの料金
              lblResult.Text += String.Format("{0}円", reader.ReadString());
              break;
            case "Stock"://空き室数（10以上は空）
              if (!int.TryParse(strValue, out numStock)) numStock = 10;
              if (numStock >= 3) strStock = "○"; else if (numStock >= 1) strStock = "△"; else strStock = "×";
              lblResult.Text += String.Format("･･･{0}
", strStock);
              break;
            default:
              break;
          }
        }
      }

      if (lblResult.Text == "") lblResult.Text = "満室です";
    }
    catch (Exception ex)
    {
    }
    finally
    {
      reader.Close();
    }
  }