اگه لطف کنید، کدش رو بزارید ممنون میشم بازم ممنون!
سلام.
چون قول داده بودم که این کد رو براتون بنویسم، اینکارو کردم. شما ابتدا فایل cs ای تحت نام WeatherService در پروژه ایجاد کرده و کد زیر رو در اون قرار بدید:
using System;
using System.Collections.Generic;
using System.Web;
using System.Xml;
/// <summary>
/// Represents the wind direction.
/// </summary>
public enum WindDirectionEnum
{
/// <summary>
/// Indicates the south-west direction.
/// </summary>
SouthWest = 0,
/// <summary>
/// Indicates the south direction.
/// </summary>
South,
/// <summary>
/// Indicates the south-east direction.
/// </summary>
SouthEast,
/// <summary>
/// Indicates the north-west direction.
/// </summary>
NorthWest,
/// <summary>
/// Indicates the north direction.
/// </summary>
North,
/// <summary>
/// Indicates the north-east direction.
/// </summary>
NorthEast,
/// <summary>
/// Indicates a steady direction.
/// </summary>
Normal,
/// <summary>
/// Indicates the east direction.
/// </summary>
East,
/// <summary>
/// Indicates the west direction.
/// </summary>
West
}
/// <summary>
/// Represents the wind status.
/// </summary>
public enum WindStatusEnum
{
/// <summary>
/// Indicates the MehAlood status.
/// </summary>
MehAlood = 0,
/// <summary>
/// Indicates the RagbarBarf status.
/// </summary>
RagbarBarf,
/// <summary>
/// Indicates the GhesmatiAbri status.
/// </summary>
GhesmatiAbri,
/// <summary>
/// Indicates the MeheRaghigh status.
/// </summary>
MeheRaghigh,
/// <summary>
/// Indicates the KamiAbri status.
/// </summary>
KamiAbri,
/// <summary>
/// Indicates the ToofanVaGardoKhak status.
/// </summary>
ToofanVaGardoKhak,
/// <summary>
/// Indicates the GhobarAlood status.
/// </summary>
GhobarAlood,
/// <summary>
/// Indicates the GhobareMahalli status.
/// </summary>
GhobareMahalli,
/// <summary>
/// Indicates the AfzayesheAbr status.
/// </summary>
AfzayesheAbr,
/// <summary>
/// Indicates the RagbareBaran status.
/// </summary>
RagbareBaran,
/// <summary>
/// Indicates the BaresheBaran status.
/// </summary>
BaresheBaran,
/// <summary>
/// Indicates the BaresheBarfVaBaran status.
/// </summary>
BaresheBarfVaBaran,
/// <summary>
/// Indicates the Abri status.
/// </summary>
Abri,
/// <summary>
/// Indicates the NimeAbri status.
/// </summary>
NimeAbri,
/// <summary>
/// Indicates the Saf status.
/// </summary>
Saf,
/// <summary>
/// Indicates the BaresheBarf status.
/// </summary>
BaresheBarf
}
/// <summary>
/// Represents a class that holds the weather information associated with a given station .
/// </summary>
public class WeatherStation
{
/// <summary>
/// Initializes a new instance of the WeatherStation class.
/// </summary>
public WeatherStation()
{
}
/// <summary>
/// Gets or sets the Id field of the Weather Station.
/// </summary>
public int Id { get; set; }
/// <summary>
/// Gets or sets the City associated with the station.
/// </summary>
public string City { get; set; }
/// <summary>
/// Gets or sets the DateTime that the sample is taken.
/// </summary>
public DateTime DateTime { get; set; }
/// <summary>
/// Gets or sets the Temperature measure in the station.
/// </summary>
public int? Temperature { get; set; }
/// <summary>
/// Gets or sets the Wind Speed.
/// </summary>
public int? WindSpeed { get; set; }
/// <summary>
/// Gets or sets one of the predefined <see cref="WindDirectionEnum"/> values.
/// </summary>
public WindDirectionEnum? WindDirection { get; set; }
/// <summary>
/// Gets or sets the current wind status of the station.
/// </summary>
public WindStatusEnum? WindStatus { get; set; }
}
/// <summary>
/// Provides a utility class that handles weather-oriented services.
/// </summary>
public class WeatherService
{
/// <summary>
/// The cache slot's name used to cache the weather info.
/// </summary>
private const string WeatherStationCache = "WeatherStationCache";
/// <summary>
/// A synchronization object used to control the concurrent access to the object.
/// </summary>
private static object syncRoot = new object();
/// <summary>
/// The currently created instance of the class, if any.
/// </summary>
private static volatile WeatherService instance = null;
/// <summary>
/// A string array representing the different wind directions.
/// </summary>
private static string[] directions = new string[] { "جنوب غربي", "جنوبي", "جنوب شرقي", "شمال غربي", "شمالي", "شمال شرقي", "آرام", "شرقي", "غربي" };
/// <summary>
/// A string array representing the different wind status.
/// </summary>
private static string[] status = new string[] { "مه آلود", "رگبار برف", "قسمتي ابري", "مه رقيق", "كمي ابري", "توفان وگردوخاك", "غبارآلود", "غبارمحلي", "افزايش ابر", "رگبار باران", "بارش باران", "بارش باران وبرف", "ابري", "نيمه ابري", "صاف", "بارش برف" };
/// <summary>
/// Gets the current instance of the <see cref="WeatherService"/>.
/// </summary>
public static WeatherService Instance
{
get
{
if (instance == null)
{
lock (syncRoot)
{
if (instance == null)
{
instance = new WeatherService();
}
}
}
return instance;
}
}
/// <summary>
/// Gets a strongly-typed collection of <see cref="WeatherStation"/> objects.
/// </summary>
/// <returns>A strongly-typed collection of <see cref="WeatherStation"/> objects.</returns>
public List<WeatherStation> GetWeatherStationsInfo()
{
List<WeatherStation> list = HttpContext.Current.Cache[WeatherStationCache] as List<WeatherStation>;
if (list == null)
{
XmlDocument doc = new XmlDocument();
doc.Load("http://www.weather.ir/farsi/RSS/xml.asp");
list = new List<WeatherStation>();
foreach (XmlNode node in doc.SelectNodes("//row"))
{
WeatherStation station = new WeatherStation();
station.Id = int.Parse(node["StationNo"].InnerText);
station.City = node["fcity"].InnerText;
station.DateTime = DateTime.Parse(node["DateTime1"].InnerText);
station.Temperature = string.IsNullOrEmpty(node["Tmp"].InnerText) ? null : (int?)int.Parse(node["Tmp"].InnerText);
station.WindSpeed = string.IsNullOrEmpty(node["WindSpeed"].InnerText) ? null : (int?)int.Parse(node["WindSpeed"].InnerText);
station.WindDirection = string.IsNullOrEmpty(node["windir"].InnerText) ? null : (WindDirectionEnum?)FindIndex(directions, node["windir"].InnerText);
station.WindStatus = string.IsNullOrEmpty(node["Curr_weather"].InnerText) ? null : (WindStatusEnum?)FindIndex(status, node["Curr_weather"].InnerText);
list.Add(station);
}
HttpContext.Current.Cache.Insert(WeatherStationCac he, list, null, DateTime.Now.AddMinutes(10), TimeSpan.Zero);
}
return list;
}
/// <summary>
/// Gets the zero-based index of an element in a given string array.
/// </summary>
/// <param name="array">The string array to search.</param>
/// <param name="searchString">The string to find.</param>
/// <returns>A zero-based index of an element in a given array.</returns>
private int FindIndex(string[] array, string searchString)
{
for (int i = 0; i < array.Length; i++)
{
if (array[i] == searchString)
return i;
}
throw new InvalidOperationException();
}
}
سپس، در صفحه ای که DropDownList خودتون رو گذاشتید، کد زیر رو بنویسید:
/// <summary>
/// Occurs when the selection from the list control changes between posts to the server.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The event data.</param>
protected void ddlCity_SelectedIndexChanged(object sender, EventArgs e)
{
string selectedCity = this.ddlCity.SelectedValue;
if (string.IsNullOrEmpty(selectedCity))
return;
List<WeatherStation> stations = WeatherService.Instance.GetWeatherStationsInfo();
Debug.Assert(stations != null && stations.Count > 0);
WeatherStation ws = stations.Find(delegate(WeatherStation station) { return station.City == selectedCity; });
if (ws != null)
{
if (ws.WindStatus != null)
{
string imagePath = string.Format("/images/{0}.png", ws.WindStatus.Value);
//Now let's show the picture.
}
}
}
بعد، کافیه تا فایلهای PNG ای در شاخه images با اسامی زیر ایجاد کنید:
MehAlood.png، RagbarBarf.png و ... (این اسامی رو می تونید از enum موجود در کد بردارید)و بعد همانطوریکه می بینید، در Handler فوق، یک string بنام imagePath درست کردم که مسیر به فایل .png رو در اون قرار میدم. از اینجا به بعدش هم که معلومه. اسم فایل رو که دارید و میتونید براحتی تصویر مورد نظر رو load کنید. (البته روش درست استفاده از css sprites هاست. شما می تونید یک png تشکیل بدید و در css هر یک رو تعریف کنید. اگر پروژه رو من قرار بود انجام بدم، حتما اینکارو میکردم).
موفق باشید.
پاورقی:
کد مزبور با توجه به StyleCop مایکروسافت نوشته شده تا دیگران نیز با روش صحیح نوشتن کد آشنا بشن.
خودتون باید error-handling کد رو به کد من اضافه کنید.
کد فوق اطلاعات رو برای دفعه اول از URL ای که دادید میگیره. سپس اطلاعات رو برای 10 دقیقه Cache میکنه. تو این 10 دقیقه دیگه سراغ سرور نمیره و از Cache موجود استفاده می کنه. شما باید این 10 دقیقه رو تغییر بدید و بعنوان مثال هر 24 ساعت یکبار بسراغ سرور برید. (چون شرایط آب و هوایی روزانه تغییر میکنه، نه 10 دقیقه یکبار).
جای XmlDocument میشد از DataSet و دیگر روشها استفاده کرد، اما من XmlDocument رو ترجیح میدم.