Validate latitude and longitude

Question

I want to validate the latitude and longitude. Right now, I check just so that the value is not empty, but I want a validation to check that it is a valid latidue or longitude.

How do I do that?

My property looks like this:

public string Lat {     get {         return this._lat;      }     set      {         base.ValidationErrors.Remove("Lat");          if (String.IsNullOrWhiteSpace(value))         {             this.ValidationErrors.Add("Lat", strings.Positions_Lat_Empty);         }          this._lat = value != null ? value.Trim() : null;     } }  public string Lng {     get {          return this._lng;      }     set {          base.ValidationErrors.Remove("Lng");          if (String.IsNullOrWhiteSpace(value))         {             this.ValidationErrors.Add("Lng", strings.Positions_Lng_Empty);         }          this._lng = value != null ? value.Trim() : null;      } } 

Answer 1

From MSDN

http://msdn.microsoft.com/en-us/library/aa578799.aspx

Latitude measures how far north or south of the equator a place is located. The equator is situated at 0°, the North Pole at 90° north (or 90°, because a positive latitude implies north), and the South Pole at 90° south (or –90°). Latitude measurements range from 0° to (+/–)90°.

Longitude measures how far east or west of the prime meridian a place is located. The prime meridian runs through Greenwich, England. Longitude measurements range from 0° to (+/–)180°.

In your setter for latitude, check if the value being set falls between -90 and 90 degrees. If it doesn't, throw an exception. For your longitude, check to see if the value falls between -180 and 180 degrees. If it doesn't, throw an exception.