ArcGIS Pro 2.7 API Reference Guide
Subscribe Method (RowDeletedEvent)
Example 

ArcGIS.Desktop.Editing.Events Namespace > RowDeletedEvent Class : Subscribe Method
The delegate that gets executed when the event is published.
The table to listen to.
(optional) The type of reference used to maintain the delegate. false is a weak reference, true is a strong reference. (default value = false)
Subscribes to RowChangedEvents that are published when a row is deleted. This method must be called on the MCT. Use QueuedTask.Run
Syntax

Parameters

action
The delegate that gets executed when the event is published.
table
The table to listen to.
keepSubscriberAlive
(optional) The type of reference used to maintain the delegate. false is a weak reference, true is a strong reference. (default value = false)

Return Value

A token that uniquely identifies the subscription.
Example
protected void subRowEvent()
{
  QueuedTask.Run(() =>
  {
    //Listen for row events on a layer
    var featLayer = MapView.Active.GetSelectedLayers().First() as FeatureLayer;
    var layerTable = featLayer.GetTable();

    //subscribe to row events
    var rowCreateToken = RowCreatedEvent.Subscribe(OnRowCreated, layerTable);
    var rowChangeToken = RowChangedEvent.Subscribe(OnRowChanged, layerTable);
    var rowDeleteToken = RowDeletedEvent.Subscribe(OnRowDeleted, layerTable);
  });
}

protected void OnRowCreated(RowChangedEventArgs args)
{
  // RowEvent callbacks are always called on the QueuedTask so there is no need 
  // to wrap your code within a QueuedTask.Run lambda.

  // update a separate table when a row is created
  // You MUST use the ArcGIS.Core.Data API to edit the table. Do NOT
  // use a new edit operation in the RowEvent callbacks
  try
  {
    // update Notes table with information about the new feature
    var geoDatabase = new Geodatabase(new FileGeodatabaseConnectionPath(new Uri(Project.Current.DefaultGeodatabasePath)));
    var table = geoDatabase.OpenDataset<Table>("Notes");
    var tableDefinition = table.GetDefinition();
    using (var rowbuff = table.CreateRowBuffer())
    {
      // add a description
      rowbuff["Description"] = "OID: " + args.Row.GetObjectID().ToString() + " " + DateTime.Now.ToShortTimeString();
      table.CreateRow(rowbuff);
    }
  }
  catch (Exception e)
  {
    MessageBox.Show($@"Error in OnRowCreated for OID: {args.Row.GetObjectID()} : {e.ToString()}");
  }
}


private Guid _currentRowChangedGuid = Guid.Empty;

protected void OnRowChanged(RowChangedEventArgs args)
{
  // RowEvent callbacks are always called on the QueuedTask so there is no need 
  // to wrap your code within a QueuedTask.Run lambda.

  var row = args.Row;

  // check for re-entry  (only if row.Store is called)
  if (_currentRowChangedGuid == args.Guid)
    return;

  var fldIdx = row.FindField("POLICE_DISTRICT");
  if (fldIdx != -1)
  {
    //Validate any change to �police district�
    //   cancel the edit if validation on the field fails
    if (row.HasValueChanged(fldIdx))
    {
      if (FailsValidation(row["POLICE_DISTRICT"].ToString()))
      {
        //Cancel edits with invalid �police district� values
        args.CancelEdit($"Police district {row["POLICE_DISTRICT"]} is invalid");
      }
    }

    // update the description field
    row["Description"] = "Row Changed";

    //  this update with cause another OnRowChanged event to occur
    //  keep track of the row guid to avoid recursion
    _currentRowChangedGuid = args.Guid;
    row.Store();
    _currentRowChangedGuid = Guid.Empty;
  }
}

protected void OnRowDeleted(RowChangedEventArgs args)
{
  var row = args.Row;

  // cancel the delete if the feature is in Police District 5

  var fldIdx = row.FindField("POLICE_DISTRICT");
  if (fldIdx != -1)
  {
    var value = row[fldIdx].ToString();
    if (value == "5")
      args.CancelEdit();
  }
}
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

RowDeletedEvent Class
RowDeletedEvent Members