async public Task <IFeatureCursor> GetFeatures(IQueryFilter filter)
{
_lastException = null;
if (filter is IBufferQueryFilter)
{
ISpatialFilter sFilter = await BufferQueryFilter.ConvertToSpatialFilter(filter as IBufferQueryFilter);
if (sFilter == null)
{
return(null);
}
return(await GetFeatures(sFilter));
}
return(await OgcSpatialFeatureCursor.Create(this, filter));
}
async public Task <ISelectionSet> Select(IQueryFilter filter)
{
filter.SubFields = this.IDFieldName;
if (filter is ISpatialFilter)
{
filter.AddField(this.ShapeFieldName);
}
using (IFeatureCursor cursor = await OgcSpatialFeatureCursor.Create(this, filter))
{
IFeature feat;
SpatialIndexedIDSelectionSet selSet = new SpatialIndexedIDSelectionSet(this.Envelope);
while ((feat = await cursor.NextFeature()) != null)
{
selSet.AddID(feat.OID, feat.Shape);
}
return(selSet);
}
}
async static public Task <IFeatureCursor> Create(OgcSpatialFeatureclass fc, IQueryFilter filter)
{
var featureCursor = new OgcSpatialFeatureCursor(fc, filter);
if (fc == null || fc.Dataset == null)
{
return(featureCursor);
}
featureCursor._idField = fc.IDFieldName;
if (filter is ISpatialFilter)
{
featureCursor._spatialfilter = (ISpatialFilter)filter;
}
try
{
if (fc.SpatialReference != null &&
filter is ISpatialFilter &&
((ISpatialFilter)filter).FilterSpatialReference != null &&
!((ISpatialFilter)filter).FilterSpatialReference.Equals(fc.SpatialReference))
{
filter = (ISpatialFilter)filter.Clone();
((ISpatialFilter)filter).Geometry =
GeometricTransformerFactory.Transform2D(((ISpatialFilter)filter).Geometry,
((ISpatialFilter)filter).FilterSpatialReference,
fc.SpatialReference);
((ISpatialFilter)filter).FilterSpatialReference = null;
if (((ISpatialFilter)filter).SpatialRelation == spatialRelation.SpatialRelationMapEnvelopeIntersects &&
((ISpatialFilter)filter).Geometry != null)
{
((ISpatialFilter)filter).Geometry = ((ISpatialFilter)filter).Geometry.Envelope;
}
featureCursor._spatialfilter = (ISpatialFilter)filter;
}
DbCommand command = ((OgcSpatialDataset)fc.Dataset).SelectCommand(
fc, filter, out featureCursor._shapeField);
if (command == null)
{
return(featureCursor);
}
featureCursor._subFields = filter.QuerySubFields.ToArray();
featureCursor._conn = ((OgcSpatialDataset)fc.Dataset).ProviderFactory.CreateConnection();
featureCursor._conn.ConnectionString = fc.Dataset.ConnectionString;
command.Connection = featureCursor._conn;
if (featureCursor._conn.State != ConnectionState.Closed)
{
try
{
featureCursor._conn.Close();
}
catch { }
}
await featureCursor._conn.OpenAsync();
command.SetCustomCursorTimeout();
featureCursor._reader = await command.ExecuteReaderAsync();
return(featureCursor);
}
catch (Exception ex)
{
if (featureCursor._fc != null)
{
featureCursor._fc.LastException = ex;
}
if (featureCursor._conn != null && featureCursor._conn.State != ConnectionState.Closed)
{
featureCursor._conn.Close();
featureCursor._conn = null;
}
fc.LastException = ex;
return(null);
}
}
