Problem was user's locale! I have sorted the issue with
double lat = double.Parse(Request.Form["lat"], CultureInfo.InvariantCulture);
This is my first attempt to implement location on my mobile site. I'm getting the user's location from their phone with w3 geolocation API and convert it to double then store it as float in sqlserver.
In most cases it works fine but in some cases the coordinates provided by the phone are quite long. For example latitude may be 3.1234567890123 so 14 numbers after the dot.
This gets saved as 3.1234567890123+E16 and causes error in the title when I try to calculate distance of user to certain point.
What is the best way to avoid it? Should I trim input from the user to a certain length so it would be converted properly?
double lat = Convert.ToDouble(Request.Form["lat"]);
double lng = Convert.ToDouble(Request.Form["lng"]);
user.UpdateMyLocationCoordinates(user.id, lat, lng);
public void UpdateMyLocationCoordinates(int userId, double lat, double lng)
{
SiteDbHelper db = new SiteDbHelper();
List<SqlParameter> sqlParameters = new List<SqlParameter>();
sqlParameters.Add(db.CreateParameter("@userId", SqlDbType.Int, userId));
sqlParameters.Add(db.CreateParameter("@latitude", SqlDbType.Float, lat));
sqlParameters.Add(db.CreateParameter("@longitude", SqlDbType.Float, lng));
db.UpdateInsertDeleteReturnAffectedRowCount ("SocialSiteUser_UpdateMyLocationCoordinates", CommandType.StoredProcedure, sqlParameters);
}
public SqlParameter CreateParameter(string name, SqlDbType type, double value)
{
SqlParameter param = new SqlParameter(name, value);
param.SqlDbType = type;
return param;
}
ALTER PROCEDURE [dbo].[SocialSiteUser_UpdateMyLocationCoordinates]
@userId int,
@latitude float,
@longitude float
AS
BEGIN
SET NOCOUNT ON
update domains_users set latitude=@latitude, longitude=@longitude where id=@userId
END
Problem was user's locale! I have sorted the issue with
double lat = double.Parse(Request.Form["lat"], CultureInfo.InvariantCulture);