Question

这是计算列表中当前位置到另一个placess的距离的json结果，但是我有一个问题我无法将距离单位（度）转换为km来自dbgeography.location.distance 这是我的代码：

 string CurrentLocation = String.Format("POINT(" + CurrentLat + " " + CurrentLng + ")", 4326);
                DbGeography point = DbGeography.PointFromText(CurrentLocation, DbGeography.DefaultCoordinateSystemId);

                var places = (from u in context.schoolinfo

                              orderby u.Location.Distance(point.Buffer(dist))

                              select u).Take(10).Select(x => new schoollinfo() { Name = x.name, Lat = x.Location.Latitude, Lng = x.Location.Longitude, Distance = x.Location.Distance(point.Buffer(dist)) }); ;

                var nearschools = places.ToList();
                return Json(nearschools, JsonRequestBehavior.AllowGet);

Print screen of result

Answer 1

对于calaculate距离它的点（LONGITUDE LATITUDE）不是POINT（LATITUDE LONGITUDE）所以代码会改变为：

 <a href="https://google.com" target="_blank">
<b onclick="location.href='https://example.com';">GO</b></a>

如何将dbgeography中的距离返回到km？

1 个答案: