HttpWebRequest请求连接天气预报接口

http://www.webxml.com.cn/WebServices/WeatherWebService.asmx

1、webservice服务地址，直接添加服务引用

public static WeatherModel GetWeatherData(string cityName)
        {
            WeatherModel model = new WeatherModel();
            try
            {
                ServiceReference1.WeatherWebServiceSoapClient client = new ServiceReference1.WeatherWebServiceSoapClient();
                string[] data = client.getWeatherbyCityName(cityName);//此方法不起作用，报错
            }
            catch (System.ServiceModel.FaultException ex)
            {
                throw ex;
            }
            return model;
        }

2、调用web地址，HttpWebRequest和HttpRequest区别：

HttpRequest:封装游览器对服务器的请求，其中包括游览器请求的网址，查询字符串或者表单

HttpWebRequest:则是用来简化网络请求的过程，从服务器上获取文件/结果的，譬如你可以在代码中用这个类冒充浏览器（设置一个UserAgent)来发请求

<appSettings>
    <add key="webWeatherByCityName" value="http://www.webxml.com.cn/WebServices/WeatherWebService.asmx/getWeatherbyCityName"/>
  </appSettings>

 

public static WeatherModel RequestWeatherData(string cityName)
        {
            WeatherModel model = new WeatherModel();
            string result = "";

            string url = ConfigurationManager.AppSettings["webWeatherByCityName"];
            HttpWebRequest request = HttpWebRequest.Create(url+"?theCityName=" + cityName) as HttpWebRequest;
            request.UserAgent = "MSIE6.0";//冒充IE6访问，不写就报错
            request.Method = "get";
            request.ContentType = "text/xml; charset=utf-8";
            HttpWebResponse response;
            try
            {
                using (response = request.GetResponse() as HttpWebResponse)
                {
                    using (Stream stream = response.GetResponseStream())
                    {
                        using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
                        {
                            result = reader.ReadToEnd();
                        }
                    }
                }
            }
            catch (WebException ex)
            {
                response= ex.Response as HttpWebResponse;
            }
            string[] data = SerializeDataXmlStr(result);
            if (data.Length == 23)
            {
                model.ID = Guid.NewGuid();
                model.Province = data[0];
                model.City = data[1];
                model.CityCode = data[2];
                model.CityCard = data[3];
                model.LastUpdateTime = DateTime.Parse(data[4]);
                WeatherCondition day1 = new WeatherCondition();
                day1.Day = DateTime.Now;
                day1.WeatherID = model.ID;
                day1.Temperature = data[5];
                day1.Condition = data[6];
                day1.Wind = data[7];
                day1.BeginTrend = data[8];
                day1.EndTrend = data[9];
                day1.Live = data[10];
                day1.LivingIndex = data[11];
                model.ConditionList = new List<WeatherCondition>();
                model.ConditionList.Add(day1);
                WeatherCondition day2 = new WeatherCondition();
                day2.Day = DateTime.Now.AddDays(1);
                day2.WeatherID = model.ID;
                day2.Temperature = data[12];
                day2.Condition = data[13];
                day2.Wind = data[14];
                day2.BeginTrend = data[15];
                day2.EndTrend = data[16];
                model.ConditionList.Add(day2);
                WeatherCondition day3 = new WeatherCondition();
                day3.Day = DateTime.Now.AddDays(2);
                day3.WeatherID = model.ID;
                day3.Temperature = data[17];
                day3.Condition = data[18];
                day3.Wind = data[19];
                day3.BeginTrend = data[20];
                day3.EndTrend = data[21];
                model.ConditionList.Add(day3);
                model.Introduce = data[22];
            }
           return model;
        }

xml字符串转换为一个数组

public static string[] SerializeDataXmlStr(string xml)
        {
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(xml);
            var nodes = doc.DocumentElement.ChildNodes;
            string[] items = new string[doc.DocumentElement.ChildNodes.Count];
            int i = 0;
            foreach (XmlElement node in nodes)
            {
                items[i++] = node.InnerText;
            }
            return items;
        }