public static ParcelFabric GetParcelFabric( 
   ParcelLayer parcelLayer
)

{
  string errorMessage = await QueuedTask.Run(() =>
  {
    try
    {
      var myParcelFabricLayer = MapView.Active.Map.GetLayersAsFlattenedList().OfType<ParcelLayer>().FirstOrDefault();
      //if there is no fabric in the map then bail
      if (myParcelFabricLayer == null)
        return "There is no fabric in the map.";
      var myParcelFabricDataset = myParcelFabricLayer.GetParcelFabric();
    }
    catch (Exception ex)
    {
      return ex.Message;
    }
    return "";
  });
  if (!string.IsNullOrEmpty(errorMessage))
    MessageBox.Show(errorMessage, "Get Parcel Fabric Dataset from layer.");
}

{
  string errorMessage = await QueuedTask.Run(() =>
  {
    try
    {
      var myParcelFabricLayer = MapView.Active.Map.GetLayersAsFlattenedList().OfType<ParcelLayer>().FirstOrDefault();
      //if there is no fabric in the map then bail
      if (myParcelFabricLayer == null)
        return "There is no fabric in the map.";
      var myParcelFabricDataset = myParcelFabricLayer.GetParcelFabric();
      var myTopology = myParcelFabricDataset.GetParcelTopology();
    }
    catch (Exception ex)
    {
      return ex.Message;
    }
    return "";
  });
  if (!string.IsNullOrEmpty(errorMessage))
    MessageBox.Show(errorMessage, "Get Parcel Fabric Topology.");
}

{
  string errorMessage = await QueuedTask.Run(() =>
{
  try
  {
    var myParcelFabricLayer = MapView.Active.Map.GetLayersAsFlattenedList().OfType<ParcelLayer>().FirstOrDefault();
    //if there is no fabric in the map then bail
    if (myParcelFabricLayer == null)
      return "There is no fabric in the map.";
    var myParcelFabricDataset = myParcelFabricLayer.GetParcelFabric();
    FeatureClass myPointsFC = myParcelFabricDataset.GetSystemTable(SystemTableType.Points) as FeatureClass;
    FeatureClass myCoonectionsFC = myParcelFabricDataset.GetSystemTable(SystemTableType.Connections) as FeatureClass;
    FeatureClass myRecordsFC = myParcelFabricDataset.GetSystemTable(SystemTableType.Records) as FeatureClass;
  }
  catch (Exception ex)
  {
    return ex.Message;
  }
  return "";
});
  if (!string.IsNullOrEmpty(errorMessage))
    MessageBox.Show(errorMessage, "Get point, connection, and record feature classes.");
}

{
  string errorMessage = await QueuedTask.Run(() =>
{
  try
  {
    var myParcelFabricLayer = MapView.Active.Map.GetLayersAsFlattenedList().OfType<ParcelLayer>().FirstOrDefault();
    //if there is no fabric in the map then bail
    if (myParcelFabricLayer == null)
      return "There is no fabric in the map.";
    string myParcelTypeName = "Tax";
    var myParcelFabricDataset = myParcelFabricLayer.GetParcelFabric();
    var typeInfo = myParcelFabricDataset.GetParcelTypeInfo();
    FeatureClass lineFCType = null;
    FeatureClass polyFCType = null;
    foreach (var info in typeInfo)
    {
      if (info.Name.Equals(myParcelTypeName, StringComparison.CurrentCultureIgnoreCase))
      {
        lineFCType = info.LineFeatureTable as FeatureClass;
        polyFCType = info.PolygonFeatureTable as FeatureClass;
        break;
      }
    }
  }
  catch (Exception ex)
  {
    return ex.Message;
  }
  return "";
});
  if (!string.IsNullOrEmpty(errorMessage))
    MessageBox.Show(errorMessage, "Get Parcel Type feature classes.");
}