Search, insert, delete, and update GIS data (arcengine)

1,Search for Data

1) Use featurcursor for Spatial Query

// Use the constructed envelope (rectangular box) to find the Element Set of featureclass at the intersection of Envelope

// The result data is obtained by repeating featurecursor. nextfeature.

Ienvelope envelope = new envelopeclass ();

Envelope. putcoords (508786,681 196, 513033,684 341 );

// Spatial Query

Ispatialfilter spatialfilter = new spatialfilterclass ();

Spatialfilter. Geometry = envelope;

String shpfld = featureclass. shapefieldname;

Spatialfilter. geometryfield = shpfield;

Spatialfilter. spatialrel = esrispatialrelenum. esrispatialrelintersects; // Intersection

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 ();

}

2) use featurecursor to query in the selection set

Ifeatureselection pfeatureselectio = pfeaturelayer as ifeatureselection;

Icursor ppcursor;
Pfeatureselectio. selectionset. Search (null, false, out ppcursor );

Ifeaturecursor pfeaturecursor = ppcursor as ifeaturecursor;

Ifeature pfeature = pfeaturecursor. nextfeature ();

3) Use featurecursor to query attributes

Iqueryfilter pqueryfilter = new queryfilterclass ();

Pqueryfilter. whereclause = "projectcode = '" + this. projectnumtextbox. Text. Trim () + "'";

Ifeaturecursor pfeaturecursor = linefeaclass. Search (pqueryfilter, false );

Ifeature pfeatureifexit = pfeaturecursor. nextfeature ();

 

2,Insert data

1) Use Insert cursors andFeaturebuffer

 
Ifeaturebuffer featurebuffer = featureclass. createfeaturebuffer ();
 

 
Ifeaturecursor featurecursor = featureclass. insert (True);
 

 
ObjectFeatureoid;
 

Featurebuffer. set_value (featurebuffer. Fields. findfield ("instby"), "B Pierce ");
 

 
For(IntIc = 0; IC <99; IC ++)
 

 
 { 
 

 
Featurebuffer. Shape = geometry;
 

 
Featureoid = featurecursor. insertfeature (featurebuffer );
 

 
}
 

Featurebuffer. set_value (featurebuffer. Fields. findfield ("instby"), "K Johnston ");
 

 
For(IntIc = 0; IC <99; IC ++)
 

 
{
 

 
Featurebuffer. Shape = Geometry
 

 
 Featureoid = featurecursor. insertfeature (featurebuffer );
 

 
}
 

 
Featurecursor. Flush ();
 

2) insert data directly (feature. Store Method)

Ifeature newlinefeature = linefeaclass. createfeature ();

Newlinefeature. Shape = pfeature. shape;
Int II = newlinefeature. Fields. findfield (areazonalname );

If (II> 0)

{

Newlinefeature. set_value (II, this. analysareacombobox. Text. Trim ());
}

Newlinefeature. Store ();

3,Data deletionDelete

Ifeatureclass featureclass = featureworkspace. openfeatureclass ("parcels ");

Iqueryfilter queryfilter = new queryfilterclass ();

Queryfilter. whereclause = "zoning_s = 'r '";

Ifeaturecursor updatecursor = featureclass. Update (queryfilter, false );

Ifeature feature = updatecursor. nextfeature ();

Int m = 0;

While (feature! = NULL)

{

M ++;

Updatecursor. deletefeature (feature );

Feature = updatecursor. nextfeature ();

}

4,Data Update Update

Ifeatureclass featureclass = featureworkspace. openfeatureclass ("parcels ");

// Query attributes

Iqueryfilter queryfilter = new queryfilterclass ();

Queryfilter. whereclause = "zoning_s = 'U '";

// Use featurecursor to update data

Ifeaturecursor updatecursor = featureclass. Update (queryfilter, false );

Int fieldindex = featureclass. findfield ("zoning_s ");

Ifeature feature = updatecursor. nextfeature ();

Int m = 0;

While (feature! = NULL)

{

M ++;

Feature. set_value (fieldindex, "x ");

Updatecursor. updatefeature (feature );

Feature = updatecursor. nextfeature ();

}