Delete(Table,KnowledgeGraphRelationshipDescription) Method

In This Topic

Deletes a relationship between the two specified entities in the KnowledgeGraphRelationshipDescription.

Syntax

C#
Visual Basic (Declaration)

public void Delete( 
   Table relationshipTable,
   KnowledgeGraphRelationshipDescription relationshipDescription
)

Public Overloads Sub Delete( _
   ByVal relationshipTable As Table, _
   ByVal relationshipDescription As KnowledgeGraphRelationshipDescription _
)

Parameters

relationshipTable: The relationship table representing an association between two entities in a knowledge graph.
relationshipDescription: A description of the relationship to delete.

Exceptions

Exception	Description
System.ArgumentNullException	relationshipTable cannot be null.
System.ArgumentNullException	relationshipDescription cannot be null.
System.ArgumentException	The relationshipTable is either not part of a Knowledge Graph or not a Knowledge Graph relate type.

Remarks

The Delete method removes a relationship between the origin entity and the destination entity specified in the RelationshipDescription.

Example

Delete a Relationship record 2

await QueuedTask.Run(() =>
{

  var edit_op = new EditOperation()
  {
    Name = "Delete a Relationship record"
  };

  //We are  going to use mapmembers in this example
  //we could equally use feature classes/tables
  var kg_layer = mv.Map.GetLayersAsFlattenedList()?
                .OfType<ArcGIS.Desktop.Mapping.KnowledgeGraphLayer>().First();

  //entities
  var entityOrg = kg_layer.GetStandaloneTablesAsFlattenedList()
                  .First(child_layer => child_layer.Name == "Organization");
  var entityPerson = kg_layer.GetStandaloneTablesAsFlattenedList()
                  .First(child_layer => child_layer.Name == "Person");

  //Relationship
  var rel_stbl = kg_layer.GetStandaloneTablesAsFlattenedList()
                  .First(child_layer => child_layer.Name == "HasEmployee");

  // get the origin, destination records
  Guid guidOrigin = Guid.Empty;
  Guid guidDestination = Guid.Empty;
  using (var rc = entityOrg.Search())
  {
    if (rc.MoveNext())
      //Use the KnowledgeGraphPropertyInfo to avoid hardcoding...
      guidOrigin = rc.Current.GetGlobalID();
  }
  using (var rc = entityPerson.Search())
  {
    if (rc.MoveNext())
      //Use the KnowledgeGraphPropertyInfo to avoid hardcoding...
      guidDestination = rc.Current.GetGlobalID();
  }

  var rd = new KnowledgeGraphRelationshipDescription(guidOrigin, guidDestination);
  edit_op.Delete(rel_stbl, rd);
  edit_op.Execute();//Do the delete
});

Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3.4 or higher.

Reference

EditOperation Class
EditOperation Members
Overload List

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