初用WebService

WebService实现天气预报

---

什么是webService

WebService是基于Web的服务。它使用Web(HTTP)方式，接收和响应外部系统的某种请求，从而实现远程调用。

WebService的协议和语言

WebService所使用的数据是基于XML格式的。WebService在数据格式上主要采用SOAP协议。
SOAP即简单对象访问协议(Simple Object Access Protocal)，它是用于交换XML编码信息的轻量级协议。
Web Service描述语言WSDL是用于描述Web Service及其函数、参数和返回值。

WebService实现天气查询

1. 首先拿到Web服务

天气的web服务

2.查看功能函数

getSupportCity：通过给定省份名称得到全部支持的城市

getSupportDataSet：获得一个dataset集合，包括所有支持的省份城市

getSupportProvince：获得国内所有支持的省份

getWeatherbyCityName ：获得指定城市的天气信息

3.新建项目

1. 打开VS-新建一个Web项目

2. 添加服务引用-高级-添加Web引用
   

3. 新建一个Web页面

前端内容：

<form id="form1" runat="server">    <div>               <label>省份：</label><asp:DropDownList ID="Province" runat="server" AutoPostBack="True" OnSelectedIndexChanged="Province_SelectedIndexChanged"></asp:DropDownList><br/>        <br/>        <label>城市：</label><asp:DropDownList ID="City" runat="server" AutoPostBack="True"></asp:DropDownList><br/>        <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />    </div>        <br/>    <div>        <label>查询日期：</label><asp:Label ID="Label7" runat="server" Text="Label"></asp:Label><br/>        <label>查询城市：</label><asp:Label ID="Label8" runat="server" Text="Label"></asp:Label><br/>        <label>今日实况：</label><asp:Label ID="Label1" runat="server" Text="Label"></asp:Label> <br/>        <label>今日天气：</label><asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>            <asp:Image ID="Image1" runat="server" />            <asp:Image ID="Image2" runat="server" /><br/>        <label>今日指数：</label><asp:Label ID="Label5" runat="server" Text="Label"></asp:Label><br/>        <label>明日天气：</label><asp:Label ID="Label3" runat="server" Text="Label"></asp:Label>            <asp:Image ID="Image3" runat="server" />            <asp:Image ID="Image4" runat="server" /><br/>        <label>后日天气：</label><asp:Label ID="Label4" runat="server" Text="Label"></asp:Label>            <asp:Image ID="Image5" runat="server" />            <asp:Image ID="Image6" runat="server" /><br/>        <label>城市简介：</label><br/>        <asp:Image ID="Image7" runat="server" />        <asp:Label ID="Label6" runat="server" Text="Label"></asp:Label>    </div>    </form>

后端内容：

WeatherWebService client = new WeatherWebService();        protected void Page_Load(object sender, EventArgs e)        {            if (!IsPostBack)            {                BindProvince();                           }                  }//省份数据的绑定public void BindProvince()        {            DataSet ds = client.getSupportDataSet();            Province.DataSource = ds.Tables[0].DefaultView;            Province.DataTextField = "Zone";            Province.DataValueField = "ID";            Province.DataBind();        }//城市数据的绑定public void BindCity(string zongID)        {            DataSet ds = client.getSupportDataSet();            DataView dv = new DataView(ds.Tables[1]);            dv.RowFilter = "ZoneID=" + zongID;            City.DataSource = dv;            City.DataTextField = "Area";            City.DataValueField = "AreaCode";            City.DataBind();        }//天气数据的绑定public void BindCityWeather(string cityName)        {            string[] weather = client.getWeatherbyCityName(cityName);            Label1.Text = weather [10];            Label2.Text = weather [6] + "   " + weather [5] + "   " + weather [7];            Label3.Text = weather [13] + "   " + weather [12] + "   " + weather [14];            Label4.Text = weather [18] + "   " + weather [17] + "   " + weather [19];            Label5.Text = weather [11];            Label6.Text = weather [22];            Label7.Text = Convert.ToDateTime(weather [4]).ToLongDateString();            Label8.Text = weather [0] + " / " + weather [1];            Image1.ImageUrl = "~/Resource/weather/" + weather [8];            Image2.ImageUrl = "~/Resource/weather/" + weather [9];            Image3.ImageUrl = "~/Resource/weather/" + weather [15];            Image4.ImageUrl = "~/Resource/weather/" + weather [16];            Image5.ImageUrl = "~/Resource/weather/" + weather [20];            Image6.ImageUrl = "~/Resource/weather/" + weather [21];            Image7.ImageUrl = "~/Resource/City2/" + weather [3];            Image7.AlternateText = City.SelectedItem.Text;        }//按钮点击事件protected void Button1_Click(object sender, EventArgs e)        {            //Button控件的点击事件会触发IsPostBack            string cityName = City.SelectedItem.Value.ToString();            BindCityWeather(cityName);         }//省份下拉列表的选择改变事件        protected void Province_SelectedIndexChanged(object sender, EventArgs e)        {            //DropDownList的SelectedIndexChanged无法触发解决办法            //把控件的AutoPostTBack设为True,在IsPostBack中写处理方法            string ID = Province.SelectedItem.Value.ToString();            BindCity(ID);        }

保存-运行。