[英]How to get lat long from database using c#.net
$(document).ready(function () { $(document).ready(function(){
$.ajax({
type: "POST",
url: "map.aspx/getCityPopulation2",
//data: jsonData,
contentType: "application/json; charset=utf-8",
data: "{}",
dataType: "json",
success: function (data) {
var points = L.geoJson(data, {
pointToLayer: function (feature, latlng) {
marker = L.marker(latlng, { icon: ratIcon })
marker.bindPopup(feature.properties.Source + '<br/>');
return marker;
}
}).addTo(pointsCluster);
mymap.addLayer(pointsCluster);
}
});
2. Here is my code behind from where query is executing. 2.这是我执行查询后的代码。
[WebMethod]
public static List<cityPopulation2> getCityPopulation2()
{
List<cityPopulation2> p = new List<cityPopulation2>();
using (NpgsqlConnection con = new NpgsqlConnection("Server=Localhost;Port=5432;User Id=postgres;Password=postgres;Database=post;"))
{
string myQuery = "select complaintlgeolon,complaintlgeolat from mandapet.pgr_demo_view";
NpgsqlCommand cmd = new NpgsqlCommand();
cmd.CommandText = myQuery;
cmd.CommandType = CommandType.Text;
cmd.Connection = con;
con.Open();
NpgsqlDataReader dr = cmd.ExecuteReader();
if (dr.HasRows)
{
while (dr.Read())
{
cityPopulation2 cpData = new cityPopulation2();
cpData.lat = Convert.ToInt32(dr["complaintlgeolon"]);
cpData.lng = Convert.ToInt32(dr["complaintlgeolon"]);
p.Add(cpData);
}
}
}
return p;
}
} }
public class cityPopulation2
{
public int lat { get; set; }
public int lng { get; set; }
// public string id { get; set; }
}
3.Please any one guide me where i'm going wrong. 3.请任何人指导我我要去哪里错了。 i need to fetch data as j son and plot Markers 我需要以儿子的身份获取数据并绘制标记
As per your comments if you what to return json..You can use JavaScriptSerializer
根据您的评论(如果要返回json)。可以使用JavaScriptSerializer
JavaScriptSerializer ASerializer = new JavaScriptSerializer();
//you can create your own custom converter of cityPopulation2
ASerializer.RegisterConverters(new JavaScriptConverter[] {new cityPopulation2()});
var Json = ASerializer.Serialize(p);
return Json;
Also make sure your DB values for lag and long
are int
还要确保您的lag and long
数据库值是int
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