Plant SDK: Reacting on Database Changes

By Marat Mirgaleev

Issue

I would like to get notified when some data changed in the project database. Which event shall I subscribe for?

Solution

You will need to create an event handler for the DataLinksManager.DataLinkOperationOccurred event. This is a code sample:

static private bool _isActive = true; // To avoid recursion                 // Event Handler        //---------------------------------------------------------------        public static void dlm_DataLinkOperationOccurred(object sender,                                                      DataLinkEventArgs e)        {          if (e.Action == DataLinkAction.RowModified && _isActive)          {            try            {              DataLinksManager dlm = PlantApplication.CurrentProject.                                 ProjectParts["Piping"].DataLinksManager;              if (dlm.HasProperty(e.RowId, "MyProperty"))              {                StringCollection props = new StringCollection();                props.Add("Size");                props.Add("Spec");                     StringCollection values = null;                values = dlm.GetProperties(e.RowId, props, true);                     PpObjectIdArray ppoids = dlm.FindAcPpObjectIds(e.RowId);                     StringCollection newprops = new StringCollection();                newprops.Add("MyProperty");                     StringCollection newvals = new StringCollection();                newvals.Add(values[0] + values[1]);                     _isActive = false;                dlm.SetProperties(ppoids.First.Value, newprops, newvals);              }            }            catch            {              System.Diagnostics.Debug.WriteLine(                      "Error in the Event Handler:n{0}", e.ToString() );            }            finally            {              _isActive = true;            }          }        }                  // Subscribe to the event        //---------------------------------------------------------------        [CommandMethod("AddEventHandler", CommandFlags.Modal)]        public static void AddEventHandler()        {          try          {            DataLinksManager dlm = PlantApplication.CurrentProject.                                 ProjectParts["Piping"].DataLinksManager;            dlm.DataLinkOperationOccurred +=                  new DataLinkEventHandler(dlm_DataLinkOperationOccurred);          }          catch (Exception e)          {            System.Windows.Forms.MessageBox.Show(e.ToString(),                                          "Cannot add the Event Handler");          }        }                  // Remove the subscription        //---------------------------------------------------------------        [CommandMethod("RemoveEventHandler", CommandFlags.Modal)]        public static void RemoveEventHandler()        {          try      &#
160;   {            DataLinksManager dlm = PlantApplication.CurrentProject.                                 ProjectParts["Piping"].DataLinksManager;            dlm.DataLinkOperationOccurred -=                  new DataLinkEventHandler(dlm_DataLinkOperationOccurred);          }          catch (Exception e)          {            System.Windows.Forms.MessageBox.Show(e.ToString(),                                       "Cannot remove the Event Handler");          }        }