public void Dispose()
{
if (_cursor != null)
{
_cursor.Dispose();
_cursor = null;
if (!_released)
{
FeatureCache.RemoveFeatureCollection(_cfCollection);
}
}
}
private IFeatureCursor GetFeatures(Guid guid, IQueryFilter filter)
{
ICachedFeatureCollection collection = FeatureCache.GetUsableFeatureCollection(guid, filter);
if (collection != null)
{
return(collection.FeatureCursor(filter));
}
else
{
FeatureCache.RemoveFeatureCollection(guid);
collection = FeatureCache.CreateCachedFeatureCollection(guid, filter);
return(new CachingFeatureCursor(collection, this.FeatureCursor(filter)));
}
}
virtual public ISelectionSet Select(IQueryFilter filter)
{
FeatureCache.RemoveFeatureCollection(_selectionGUID);
if (this.IDFieldName != String.Empty && this.FindField(this.IDFieldName) != null)
{
filter.SubFields = this.IDFieldName;
filter.AddField(this.ShapeFieldName);
filter.AddField(this.IDFieldName);
using (IFeatureCursor cursor = this.GetFeatures(_selectionGUID, filter))
{
if (cursor != null)
{
IFeature feat;
IDSelectionSet selSet = new IDSelectionSet();
while ((feat = cursor.NextFeature) != null)
{
selSet.AddID(feat.OID);
}
return(selSet);
}
}
}
else
{
int count = 0;
using (IFeatureCursor cursor = this.GetFeatures(_selectionGUID, filter))
{
if (cursor == null)
{
return(null);
}
IFeature feature;
while ((feature = cursor.NextFeature) != null)
{
count++;
}
}
return(new QueryFilteredSelectionSet(filter, count));
}
return(null);
}
public IFeatureCursor GetSelectedFeatures(IDisplay display)
{
ICachedFeatureCollection collection = FeatureCache.GetCachedFeatureCollection(this._selectionGUID);
if (collection == null)
{
return(null);
}
if (display != null)
{
SpatialFilter filter = new SpatialFilter();
filter.SpatialRelation = spatialRelation.SpatialRelationMapEnvelopeIntersects;
filter.Geometry = display.Envelope;
filter.FilterSpatialReference = display.SpatialReference;
return(collection.FeatureCursor(filter));
}
else
{
return(collection.FeatureCursor());
}
}
async public Task <IFeature> NextFeature()
{
if (_cursor == null)
{
return(null);
}
IFeature feature = await _cursor.NextFeature();
if (_cfCollection != null)
{
if (feature != null)
{
_cfCollection.AddFeature(feature);
}
else
{
FeatureCache.ReleaseCachedFeatureCollection(_cfCollection);
_released = true;
}
}
return(feature);
}