///// <summary>
///// Loads a Ogr datasource with the specified layer
///// </summary>
///// <param name="filename">datasource</param>
///// <param name="layerName">name of layer</param>
/////If you want this functionality use
/////<example>
/////SharpMap.Data.Providers.Ogr prov = new SharpMap.Data.Providers.Ogr(datasource);
/////prov.LayerName = layerName;
/////</example>
//[Obsolete("This constructor does not work well with VB.NET. Use LayerName property instead")]
//public Ogr(string filename, string layerName)
//{
// Filename = filename;
// _ogrDataSource = OgrOgr.Open(filename, 1);
// _ogrLayer = _ogrDataSource.GetLayerByName(layerName);
// OsrSpatialReference spatialReference = _ogrLayer.GetSpatialRef();
// if (spatialReference != null)
// SRID = spatialReference.AutoIdentifyEPSG();
//}
/// <summary>
/// Loads a Ogr datasource with the specified layer
/// </summary>
/// <param name="filename">datasource</param>
/// <param name="layerNum">number of layer</param>
public Ogr(string filename, int layerNum)
{
Filename = filename;
ConnectionID = filename;
_ogrDataSource = OgrOgr.OpenShared(filename, 0);
using (var ogrLayer = GetLayer(layerNum))
{
OsrSpatialReference spatialReference = ogrLayer.GetSpatialRef();
if (spatialReference != null)
{
SRID = spatialReference.AutoIdentifyEPSG();
}
}
_layerIndex = layerNum;
}
/// <summary>
/// Method to get a layer based on a private copy of the data source
/// </summary>
/// <param name="layerIndex">The layer index</param>
/// <param name="ogrDataSource">The data source</param>
/// <returns></returns>
private OgrLayer GetLayer(int layerIndex, out OgrDataSource ogrDataSource)
{
ogrDataSource = OgrOgr.OpenShared(Filename, 0);
return(ogrDataSource.GetLayerByIndex(layerIndex));
}