GIS数据的查找方法

利用FeaturCursor进行空间查询

//利用构造的Envelope（矩形框），查找和Envelope相交的FeatureClass的要素集

//结果数据利用循环FeatureCursor.nextFeature获得

IEnvelope envelope = new EnvelopeClass();

envelope.PutCoords(508786, 681196, 513033, 684341);

//空间查询

ISpatialFilter spatialFilter = new SpatialFilterClass();

spatialFilter.Geometry = envelope;

String shpFld = featureClass.ShapeFieldName;

spatialFilter.GeometryField = shpFld;

spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;//相交

IQueryFilter queryFilter = new QueryFilterClass();

queryFilter = (IQueryFilter)spatialFilter;

IFeatureCursor searchCursor = featureClass.Search(queryFilter, true);

IFeature feature = searchCursor.NextFeature();

int n = 0;

while (feature != null){

n++;

feature = baseCursor.NextFeature();

}

利用FeatureCursor在选择集中进行查询

IFeatureSelection pFeatureSelectio = pFeatureLayer as IFeatureSelection; 

ICursor ppCursor;

pFeatureSelectio.SelectionSet.Search(null, false, out ppCursor);

IFeatureCursor pFeatureCursor = ppCursor as IFeatureCursor; 

IFeature pFeature = pFeatureCursor.NextFeature();

利用FeatureCursor进行属性查询

IQueryFilter pQueryFilter = new QueryFilterClass();   

pQueryFilter.WhereClause = "PROJECTCODE = '" + this.ProjectNumTextBox.Text.Trim() + "'";

IFeatureCursor pFeatureCursor = LineFeaClass.Search(pQueryFilter, false);   

IFeature pFeatureIfExit = pFeatureCursor.NextFeature();