C＃SqlGeography纬度和经度意外行为

Question

Microsoft.SqlServer.Types.SqlGeography.ToString has unexpected behavior.

Take a look at my unit test:

 latitude = 40.584474F;
 longitude = -111.633491F;
 var location = SqlGeography.Point( latitude, longitude, 4326 );
 var point = location.ToString();

At this point, the variable point has a value of: POINT (-111.63349151611328 40.58447265625)

As you can see, latitude and longitude have been swapped from the norm.

This is from a nuget package downloaded today. (v11.0.2)

Clarification: Object values are correct but ToString() is producing a format which is not appropriate to SQL Server itself, even though this is a SQLServer specific class in my opinion.

Update 2: This is not a duplicate because it is different from the question with a similar title, since this is about a .NET class (Microsoft.SqlServer.Types.SqlGeography.ToString), rather than SQL Server itself.

Answer 1

The latitude and longitude have not been swapped. It's just that the Point() constructor accepts the longitude after latitude, but in ToString() longitude is printed before latitude.

Print the values location.Lat and location.Long to know for sure.

Answer 2

SQL Server 12 will accept: geography::Point(47.65100, -122.3490, 4326). To produce the string that would be acceptable to SQL Server:

var point = ColValue as SqlGeography;
if (point != null)
return "geography::Point(" + point.Lat + ", " + point.Long + ", 4326)";