调用百度API实现通过经度纬度确定位置

供应商表结构：

CREATE TABLE [dbo].[Supply](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [Province] [nvarchar](50) NULL,
    [City] [nvarchar](50) NULL,
    [Address] [nvarchar](100) NULL,
    [Contacter] [nvarchar](50) NULL,
    [Lag] [nvarchar](50) NULL,
    [Lat] [nvarchar](50) NULL,
    [Tel] [nvarchar](50) NULL,
 CONSTRAINT [PK_Supply] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

代码分三层写的：

Model

 public class SupplyModel
    {
        public SupplyModel()
        {
        }

        private int _id;
        public int ID
        {
            get { return _id; }
            set { _id = value; }
        }


        private string _province;
        public string Province
        {
            get { return _province; }
            set { _province = value; }
        }

        private string _city;
        public string City
        {
            get { return _city; }
            set { _city = value; }
        }

        private string _address;
        public string Address
        {
            get { return _address; }
            set { _address = value; }
        }

        private string _contacter;
        public string Contacter
        {
            get { return _contacter; }
            set { _contacter = value; }
        }
        /// <summary>
        /// 经度
        /// </summary>
        private string _lag;
        public string Lag
        {
            get { return _lag; }
            set { _lag = value; }
        }
        /// <summary>
        /// 纬度
        /// </summary>
        private string _lat;
        public string Lat
        {
            get { return _lat; }
            set { _lat = value; }
        }

        private string _tel;
        public string Tel
        {
            get { return _tel; }
            set { _tel = value; }
        }
    }

DAL

 public class SupplyDAL
    {
        public SupplyDAL()
        {
        }

        public bool AddSupply(NeoModel.SupplyModel model)
        {
            string sql = "INSERT INTO Supply(Province,City,Address,Contacter,Lag,Lat,Tel) VALUES(@Province,@City,@Address,@Contacter,@Lag,@Lat,@Tel)";
            SqlParameter[] sp = { 
                                new SqlParameter("@Province",model.Province),
                                new SqlParameter("@City",model.City),
                                new SqlParameter("@Address",model.Address),
                                new SqlParameter("@Contacter",model.Contacter),
                                new SqlParameter("@Lag",model.Lag),
                                new SqlParameter("@Lat",model.Lat),
                                new SqlParameter("@Tel",model.Tel)
                                };
            return DbHelperSQL.ExecuteSql(sql, sp) > 0;

        }
        public DataTable GetSupply()
        {
            string strSql = "SELECT * FROM SUPPLY";
            DataSet ds = DbHelperSQL.Query(strSql);
            return ds.Tables[0];
        }
    }

BLL

  public class SupplyBLL
    {
        NeoDAL.SupplyDAL dal = new NeoDAL.SupplyDAL();
        public SupplyBLL()
        {
        }

        public bool AddSupply(NeoModel.SupplyModel model)
        {
            return dal.AddSupply(model);
        }
        public DataTable GetSupply()
        {
            return dal.GetSupply();
        }
    }

页面前台：

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
    <script src="../Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
    <script language="javascript" src="http://api.map.baidu.com/api?v=1.3"></script>
 
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <input type="hidden" id="lag" runat="server" />
    <input type="hidden" id="lat" runat="server" />
    <input type="hidden" id="supply" runat="server" />
    <div id="icaption">
        <div id="title">
           baidu地图</div>
    </div>
    <div id="itable">
        <table cellspacing="1" width="1026" align="center">
            <tr class="tr4">
                <td class="td1" width="15%">
                    一级地区
                </td>
                <td width="45%">
                    <asp:Label ID="lbOne" runat="server"></asp:Label>
                </td>
                <td width="40%" rowspan="5" runat="server" id="tdContainer">
                </td>
            </tr>
            <tr class="tr4">
                <td class="td1" width="15%">
                    二级地区
                </td>
                <td width="45%">
                    <asp:Label ID="lbTwo" runat="server"></asp:Label>
                </td>
            </tr>
            <tr class="tr4">
                <td class="td1" width="15%">
                    联系人
                </td>
                <td width="45%">
                    <asp:Label ID="lbContact" runat="server"></asp:Label>
                </td>
            </tr>
            <tr class="tr4">
                <td class="td1" width="15%">
                    联系方式
                </td>
                <td width="45%">
                    <asp:Label ID="lbTel" runat="server"></asp:Label>
                </td>
            </tr>
            <tr class="tr4">
                <td class="td1" width="15%">
                    地址
                </td>
                <td width="45%">
                    <asp:Label ID="lbAddress" runat="server"></asp:Label>
                </td>
            </tr>
        </table>
    </div>
      <script language="javascript" type="text/javascript">
          var map = new BMap.Map("MainContent_tdContainer");
          var point = new BMap.Point(document.getElementById("MainContent_lag").value, document.getElementById("MainContent_lat").value);
          map.centerAndZoom(point, 17);
          var opts = {  50, height: 20, title: "" };
          var infoWindow = new BMap.InfoWindow(document.getElementById("MainContent_supply").value, opts);
          map.openInfoWindow(infoWindow, point);
          var optss = { type: BMAP_NAVIGATION_CONTROL_ZOOM };
          map.addControl(new BMap.NavigationControl(optss));
          map.addControl(new BMap.OverviewMapControl());
          map.addControl(new BMap.MapTypeControl());
    </script>
</asp:Content>

我这用的是母板页，也可以去掉母版页的标志 

后台

 public partial class map : System.Web.UI.Page
    {
        NeoBLL.SupplyBLL bll = new NeoBLL.SupplyBLL();
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                DataTable dt = bll.GetSupply();
                this.lag.Value = dt.Rows[2]["lag"].ToString();
                this.lat.Value = dt.Rows[2]["lat"].ToString();
                this.supply.Value = dt.Rows[2]["address"].ToString();
                this.lbOne.Text = dt.Rows[2]["Province"].ToString();
                this.lbTwo.Text = dt.Rows[2]["City"].ToString();
                this.lbContact.Text = dt.Rows[2]["Contacter"].ToString();
                this.lbTel.Text = dt.Rows[2]["Tel"].ToString();
                this.lbAddress.Text = dt.Rows[2]["address"].ToString();
            }
        }
    }