ArcGIS Spatial Query-白红宇

ArcGIS Spatial Query

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发布时间：2019-06-29

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Creates a spatial query which performs a spatial search for features in the supplied feature class and has the option to also apply an attribute query via a where clause.

///Creates a spatial query which performs a spatial search for features in the supplied feature class and has the option to also apply an attribute query via a where clause.
///  ///An ESRI.ArcGIS.Geodatabase.IFeatureClass///An ESRI.ArcGIS.Geometry.IGeometry (Only high-level geometries can be used)///An ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum (e.g., esriSpatialRelIntersects)///A System.String, (e.g., "city_name = 'Redlands'").///   ///
     
      An IFeatureCursor holding the results of the query will be returned.
     ///   ///
     
      Call the SpatialQuery method by passing in a reference to the Feature Class, a Geometry used for the search and the spatial operation to be preformed. An exmaple of a spatial opertaion would be intersects (e.g., esriSpatialRelEnum.esriSpatialRelContains). If you would like to return everything found by the spatial operation use "" for the where clause. Optionally a whereclause (e.g. "income > 1000") maybe applied if desired. The SQL syntax used to specify the where clause is the same as that of the underlying database holding the data.
     public ESRI.ArcGIS.Geodatabase.IFeatureCursor PerformSpatialQuery(ESRI.ArcGIS.Geodatabase.IFeatureClass featureClass, ESRI.ArcGIS.Geometry.IGeometry searchGeometry, ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum spatialRelation, System.String whereClause){  // create a spatial query filter  ESRI.ArcGIS.Geodatabase.ISpatialFilter spatialFilter = new ESRI.ArcGIS.Geodatabase.SpatialFilterClass();  // specify the geometry to query with  spatialFilter.Geometry = searchGeometry;  // specify what the geometry field is called on the Feature Class that we will be querying against  System.String nameOfShapeField = featureClass.ShapeFieldName;  spatialFilter.GeometryField = nameOfShapeField;  // specify the type of spatial operation to use  spatialFilter.SpatialRel = spatialRelation;  // create the where statement  spatialFilter.WhereClause = whereClause;  // perform the query and use a cursor to hold the results  ESRI.ArcGIS.Geodatabase.IQueryFilter queryFilter = new ESRI.ArcGIS.Geodatabase.QueryFilterClass();  queryFilter = (ESRI.ArcGIS.Geodatabase.IQueryFilter)spatialFilter;  ESRI.ArcGIS.Geodatabase.IFeatureCursor featureCursor = featureClass.Search(queryFilter, false);  return featureCursor;}