【地圖功能開發系列：二】根據地址名稱通過百度地圖API查詢出坐標

根據地址名稱通過百度地圖API查詢出坐標

百度地圖ApiUrl

`string url = "http://api.map.baidu.com/geocoder?address={0}&output=json&key=這里用自己申請的key" ` ``` //查詢出門店列表 string sql = "select shopid, shopName,shopadress, lat ,lng as lon from Shop"; //單個門店的情況 if (shopid!=0) { sql += " where shopid=" + shopid; }

    DataTable PlaceDt = kis_web.DBHelper.GetTable(sql);
    foreach (DataRow row in PlaceDt.Rows)
    {
      //請求
        var request = (HttpWebRequest)WebRequest.Create(string.Format(url, row["shopadress"]));
        var response = (HttpWebResponse)request.GetResponse();
        var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
        //請求結果
        JObject jo = (JObject)JsonConvert.DeserializeObject(responseString);
        //有些地址是查詢不出來result的,因此要做個判斷
        if (string.Equals(jo["status"].ToString(), "OK") && jo["result"].ToString() != "[]")
        {
            string lat = jo["result"]["location"]["lat"].ToString();
            string lng = jo["result"]["location"]["lng"].ToString();
            //修改數據庫中的門店坐標地址
            string updateSql = "UPDATE Shop SET lat = '{0}',lng = '{1}' WHERE shopid ='{2}'";
            int result = kis_web.DBHelper.ExeSQLs(string.Format(updateSql, lat, lng, row["shopid"]));
           
        }
    }

#測試DEMO可以直接賦值使用

    string url = "http://api.map.baidu.com/geocoder?address={0}&output=json&key=key";
    var request = (HttpWebRequest)WebRequest.Create(string.Format(url, "廣州"));
    var response = (HttpWebResponse)request.GetResponse();
    var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
    JObject jo = (JObject)JsonConvert.DeserializeObject(responseString);
    string lng = jo["result"]["location"]["lng"].ToString();
    string lat = jo["result"]["location"]["lat"].ToString();
    Response.Write(lng + "|" + lat);

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*相關命名空間*

using Newtonsoft.Json;
using System.Net;
using Newtonsoft.Json.Linq;

*通過上訴的操作，這樣就可以將數據庫中擁有地址的門店賦值坐標*