public sealed class RowToken 

// Creates a new feature using the specified editing template and polygon geometry, and adds an attachment to the feature in a single edit operation.
await QueuedTask.Run(() =>
  {
    //The EditOperation.AddAttachment method to take a RowToken as a parameter 
    //allows you to create a feature, using EditOperation.CreateEx, and add an attachment in one transaction.

    EditOperation editOpAttach = new()
    {
      Name = string.Format($@"Create new polygon with attachment in '{currentTemplate.Layer.Name}'")
    };

    var attachRowToken = editOpAttach.Create(currentTemplate, polygon);
    editOpAttach.AddAttachment(attachRowToken, @"c:\temp\image.jpg");

    //Must be within a QueuedTask
    if (!editOpAttach.IsEmpty)
    {
      //Execute and ExecuteAsync will return true if the operation was successful and false if not
      var result = editOpAttach.Execute();
    }
  });

{
  var mv = MapView.Active;
  var create_rel1 = await QueuedTask.Run(() =>
  {
    //This example uses a chained edit operation
    var edit_op = new EditOperation()
    {
      Name = "Create entities and a relationship",
      SelectNewFeatures = true
    };

    //We are just going to use the GDB objects in this one but
    //we could equally use feature layers/standalone tables

    //using Feature Class/Tables (works within Investigation or map)
    var org_fc = kg.OpenDataset<FeatureClass>("Organization");
    var person_tbl = kg.OpenDataset<Table>("Person");
    //Relationship table
    var emp_tbl = kg.OpenDataset<Table>("HasEmployee");

    var attribs = new Dictionary<string, object>();

    //New Organization
    attribs["Name"] = "Acme Ltd.";
    attribs["Description"] = "Specializes in household items";
    attribs["SHAPE"] = mv.Extent.Center;//whatever is its location

    //Add it to the operation - we need the rowtoken
    var rowtoken = edit_op.Create(org_fc, attribs);

    attribs.Clear();//we are going to re-use the dictionary

    //New Person
    attribs["Name"] = "Bob";
    attribs["Age"] = "41";
    attribs["Skills"] = "Plumbing, Framing, Flooring";

    //Add it to the operation
    var rowtoken2 = edit_op.Create(person_tbl, attribs);

    attribs.Clear();

    //At this point we must execute the create of the entities
    if (edit_op.Execute())
    {
      //if we are here, the create of the entities was successful

      //Next, "chain" a second create for the relationship - this ensures that
      //Both creates (entities _and_ relation) will be -undone- together if needed
      //....in other words they will behave as if they are a -single- transaction
      var edit_op_rel = edit_op.CreateChainedOperation();

      //we need the names of the origin and destination relation properties
      var kg_prop_info = kg.GetPropertyNameInfo();
      //use the row tokens we held on to from the entity creates
      attribs[kg_prop_info.OriginIDPropertyName] = rowtoken.GlobalID;
      attribs[kg_prop_info.DestinationIDPropertyName] = rowtoken2.GlobalID;

      //Add any extra attribute information for the relation as needed
      attribs["StartDate"] = new DateTimeOffset(DateTime.Now);

      //Do the create of the relate
      edit_op_rel.Create(emp_tbl, attribs);
      return edit_op_rel.Execute();
    }
    return false;//Create of entities failed
  });
}

{
  var mv = MapView.Active;
  var createRel = await QueuedTask.Run(() =>
  {
    //This example uses a KnowledgeGraphRelationshipDescription
    var edit_op = new EditOperation()
    {
      Name = "Create entities and a relationship using a KG relate desc",
      SelectNewFeatures = true
    };

    //We are just 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();
    //From the KG Layer get the relevant child feature layer(s) and/or standalone
    //table(s)
    var org_fl = kg_layer.GetLayersAsFlattenedList().OfType<FeatureLayer>()
                    .First(child_layer => child_layer.Name == "Organization");

    var person_stbl = kg_layer.GetStandaloneTablesAsFlattenedList()
                    .First(child_layer => child_layer.Name == "Person");

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

    var attribs = new Dictionary<string, object>();

    //New Organization
    attribs["Name"] = "Acme Ltd.";
    attribs["Description"] = "Specializes in household items";
    attribs["SHAPE"] = mv.Extent.Center;//whatever is its location

    //Add it to the operation - we need the rowtoken
    var rowtoken_org = edit_op.Create(org_fl, attribs);

    attribs.Clear();//we are going to re-use the dictionary

    //New Person
    attribs["Name"] = "Bob";
    attribs["Age"] = "41";
    attribs["Skills"] = "Plumbing, Framing, Flooring";

    //Add it to the operation
    var rowtoken_person = edit_op.Create(person_stbl, attribs);

    attribs.Clear();

    //Create the new relationship using a KnowledgeGraphRelationshipDescription
    //Row handles act as the placeholders for the TO BE created new entities that will
    //be related
    var src_row_handle = new RowHandle(rowtoken_org);
    var dest_row_handle = new RowHandle(rowtoken_person);

    //Add any extra attribute information for the relation as needed
    attribs["StartDate"] = new DateTimeOffset(DateTime.Now);

    var rel_desc = new KnowledgeGraphRelationshipDescription(
                                src_row_handle, dest_row_handle, attribs);

    //Add the relate description to the edit operation
    edit_op.Create(rel_stbl, rel_desc);

    //Execute the create of the entities and relationship
    return edit_op.Execute();
  });
}

{
  var ok = await QueuedTask.Run(() =>
  {
    using (var kg_for_doc = kgLayer.GetDatastore())
    {
      var edit_op = new EditOperation()
      {
        Name = "Create Document Example",
        SelectNewFeatures = true
      };

      var doc_entity_name = GetDocumentTypeName(kg_for_doc.GetDataModel());
      if (string.IsNullOrEmpty(doc_entity_name))
        return false;
      var hasdoc_rel_name = GetHasDocumentTypeName(kg_for_doc.GetDataModel());
      if (string.IsNullOrEmpty(hasdoc_rel_name))
        return false;

      //Document can also be FeatureClass
      var doc_tbl = kg_for_doc.OpenDataset<Table>(doc_entity_name);
      var doc_rel_tbl = kg_for_doc.OpenDataset<Table>(hasdoc_rel_name);

      //This is the document to be added...file, image, resource, etc.
      var doc_url = @"E:\Data\Temp\HelloWorld.txt";
      var text = System.IO.File.ReadAllText(url);

      //Set document properties
      var attribs = new Dictionary<string, object>();
      attribs["contentType"] = @"text/plain";
      attribs["name"] = System.IO.Path.GetFileName(url);
      attribs["url"] = doc_url;
      //Add geometry if relevant
      //attribs["Shape"] = doc_location;

      //optional
      attribs["fileExtension"] = System.IO.Path.GetExtension(doc_url);
      attribs["text"] = System.IO.File.ReadAllText(doc_url);

      //optional and arbitrary - your choice
      attribs["title"] = System.IO.Path.GetFileNameWithoutExtension(doc_url);
      attribs["keywords"] = @"text,file,example";
      attribs["metadata"] = "";

      //Specify any additional custom attributes added to the document
      //schema by the user as needed....
      //attribs["custom_attrib"] = "Foo";
      //attribs["custom_attrib2"] = "Bar";

      //Get the entity whose document this is...
      var org_fc = kg_for_doc.OpenDataset<FeatureClass>("Organization");
      var qf = new ArcGIS.Core.Data.QueryFilter()
      {
        WhereClause = "name = 'Acme'",
        SubFields = "*"
      };
      var origin_org_id = Guid.Empty;
      using (var rc = org_fc.Search(qf))
      {
        if (!rc.MoveNext())
          return false;
        origin_org_id = rc.Current.GetGlobalID();//For the relate
      }

      //Create the document row/feature
      var rowtoken = edit_op.Create(doc_tbl, attribs);
      if (edit_op.Execute())
      {
        //Create the relationship row
        attribs.Clear();
        //we need the names of the origin and destination relation properties
        var kg_prop_info = kg_for_doc.GetPropertyNameInfo();
        //Specify the origin entity (i.e. the document 'owner') and
        //the document being related to (i.e. the document 'itself')
        attribs[kg_prop_info.OriginIDPropertyName] = origin_org_id;//entity
        attribs[kg_prop_info.DestinationIDPropertyName] = rowtoken.GlobalID;//document

        //Specify any custom attributes added to the has document
        //schema by the user as needed....
        //attribs["custom_attrib"] = "Foo";
        //attribs["custom_attrib2"] = "Bar";

        //"Chain" a second create for the relationship - this ensures that
        //Both creates (doc _and_ "has doc" relation) will be -undone- together if needed
        //....in other words they will behave as if they are a -single- transaction
        var edit_op_rel = edit_op.CreateChainedOperation();
        edit_op_rel.Create(doc_rel_tbl, attribs);
        return edit_op_rel.Execute();
      }
      return false;
    }
  });
}

string GetDocumentTypeName(KnowledgeGraphDataModel kg_dm)
{
  var entity_types = kg_dm.GetEntityTypes();
  foreach (var entity_type in entity_types)
  {
    var role = entity_type.Value.GetRole();
    if (role == KnowledgeGraphNamedObjectTypeRole.Document)
      return entity_type.Value.GetName();
  }
  return "";
}

string GetHasDocumentTypeName(KnowledgeGraphDataModel kg_dm)
{
  var rel_types = kg_dm.GetRelationshipTypes();
  foreach (var rel_type in rel_types)
  {
    var role = rel_type.Value.GetRole();
    if (role == KnowledgeGraphNamedObjectTypeRole.Document)
      return rel_type.Value.GetName();
  }
  return "";
}

{
  // This routine creates a pole and a transformer bank, and then creates a structural attachment association between them, all in a single edit operation
  static void CreateUNFeaturesAndAssociations(FeatureLayer transformerBankLayer,
  Dictionary<string, object> transformerBankAttributes, FeatureLayer poleLayer,
  Dictionary<string, object> poleAttributes)
  {
    // Create an EditOperation
    EditOperation editOperation = new EditOperation();
    editOperation.Name = "Create pole; create transformer bank; attach transformer bank to pole";

    // Create the transformer bank
    RowToken transformerBankToken = editOperation.Create(transformerBankLayer, transformerBankAttributes);

    // Create a pole
    RowToken poleToken = editOperation.Create(poleLayer, poleAttributes);

    // Create a structural attachment association between the pole and the transformer bank
    RowHandle poleHandle = new RowHandle(poleToken);
    RowHandle transformerBankHandle = new RowHandle(transformerBankToken);

    AssociationDescription poleAttachment =
      new AssociationDescription(AssociationType.Attachment, poleHandle, transformerBankHandle);

    editOperation.Create(poleAttachment);

    // Execute the EditOperation
    editOperation.Execute();
  }
}