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Perform Spatial Query Snippet (ArcObjects .NET 10.4 SDK)

ArcObjects Library Reference

Perform Spatial Query Snippet

[C#]

///<summary>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.</summary>
///  
///<param name="featureClass">An ESRI.ArcGIS.Geodatabase.IFeatureClass</param>
///<param name="searchGeometry">An ESRI.ArcGIS.Geometry.IGeometry (Only high-level geometries can be used)</param>
///<param name="spatialRelation">An ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum (e.g., esriSpatialRelIntersects)</param>
///<param name="whereClause">A System.String, (e.g., "city_name='Redlands'").</param>
///   
///<returns>An IFeatureCursor holding the results of the query will be returned.</returns>
///   
///<remarks>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.</remarks>
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;
}

[Visual Basic .NET]

'''<summary>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.</summary>
'''  
'''<param name="featureClass">An ESRI.ArcGIS.Geodatabase.IFeatureClass</param>
'''<param name="searchGeometry">An ESRI.ArcGIS.Geometry.IGeometry (Only high-level geometries can be used)</param>
'''<param name="spatialRelation">An ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum (e.g., esriSpatialRelIntersects)</param>
'''<param name="whereClause">A System.String, (e.g., "city_name='Redlands'").</param>
'''   
'''<returns>An IFeatureCursor holding the results of the query will be returned.</returns>
'''   
'''<remarks>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.</remarks>
Public Function PerformSpatialQuery(ByVal featureClass As ESRI.ArcGIS.Geodatabase.IFeatureClass, ByVal searchGeometry As ESRI.ArcGIS.Geometry.IGeometry, ByVal spatialRelation As ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum, ByVal whereClause As System.String) As ESRI.ArcGIS.Geodatabase.IFeatureCursor

  ' create a spatial query filter
  Dim spatialFilter As ESRI.ArcGIS.Geodatabase.ISpatialFilter=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
  Dim nameOfShapeField As System.String=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
  Dim queryFilter As ESRI.ArcGIS.Geodatabase.IQueryFilter=New ESRI.ArcGIS.Geodatabase.QueryFilterClass()
  queryFilter=CType(spatialFilter, ESRI.ArcGIS.Geodatabase.IQueryFilter)
  Dim featureCursor As ESRI.ArcGIS.Geodatabase.IFeatureCursor=featureClass.Search(queryFilter, False)

  Return featureCursor

End Function