/// <summary>
/// Converts the specified object to a Geography instance.
/// </summary>
/// <param name="instance">Object to convert.</param>
/// <returns>New Geography instance.</returns>
internal static Geography ConvertDbGeography(object instance)
{
DbGeography geography = (DbGeography)instance;
switch (geography.GeometryType)
{
case "Point":
return(GeographyFactory.Point((double)geography.Latitude, (double)geography.Longitude));
case "LineString":
int numPoints = (int)geography.NumPoints;
var factory = GeographyFactory.LineString();
for (int n = 0; n < numPoints; n++)
{
DbGeography pointN = geography.PointN(n + 1); // PointN uses a 1-based index
Debug.Assert(pointN != null, "Expected PointN to return a non-null value for this position in the linestring");
Debug.Assert(pointN.GeometryType == "Point", "Expected PointN to return a Point for this position in the linestring");
factory.LineTo(pointN.Latitude.Value, pointN.Longitude.Value, pointN.Z, pointN.M);
}
return(factory.Build());
default:
Debug.Fail("Unsupported conversion from DbGeography of type: " + geography.GeometryType);
return(null);
}
}