Collecting all child deletedlist items for a given BusinessBase

Devman posted on Friday, January 30, 2009

Hi

Has anyone tried this before?  I am trying to scan through a businessbase for children that contain deletedlist collections and then adding them to a stack. This needs to be recurrsive to search the whole object graph. 

Regards

Devman

JoeFallon1 replied on Friday, January 30, 2009

Here is an old thread that might give you some ideas:

http://forums.lhotka.net/forums/post/7444.aspx

This recursively loops through root BO to find all other BOs contained in the graph. The goal was to be able to produce a single list of Broken Rules for the entire graph.

I still use a similar concept today - but I re-wrote some of the code.

Joe

 

Devman replied on Thursday, February 05, 2009

Cheers for the reply!
I ended up with the following ;

Created an interface which is implelemented in both PBussinesBase and PBussinessListBase. These derive from the csla business bases.
The interface had one method;  void GetDeletedItems(Stack itemsToDeleted).
I created an Attribute to mark bi directional properties so to ignore them otherwise i was getting stuck in a loop.

for PBusinessBase ive got the following implementation;


 public void GetDeletedItems(Stack itemsToDeleted)
        {
            /// TODO: Look at using FieldManager/FieldData instead of reflection.

            //cascade the call to all the relevant children
            Type currentType = this.GetType();
           
            do
            {
                // get the list of properties in this type
                foreach (var p in currentType.GetProperties(BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
                {

                    // check to see if the property is not bi-directional ([IgnoreForDeletedList]) and is of correct type (IDeletedListManager)
                    if (typeof(IDeletedListManager).IsAssignableFrom(p.PropertyType) & Attribute.IsDefined(p, typeof(IgnoreForDeletedList)) != true)
                    {
                        var value = (IDeletedListManager)p.GetValue(this, null);
                        // make sure the variable has a value
                        if (value != null)
                        {
                            // it is a child object so cascade the call
                            value.GetDeletedItems(itemsToDeleted);
                        }
                    }
                }
                // move up the inheritance tree and try again
                currentType = currentType.BaseType;
            } while (currentType != typeof(PBusinessBase<T>));

        }

For PBussinessListBase i have this;

public void GetDeletedItems(Stack itemsToDeleted)
        {
            foreach (IDeletedListManager child in this)
            {
                child.GetDeletedItems(itemsToDeleted);
            }

            foreach (var obj in DeletedList)
            {
                itemsToDeleted.Push(obj);
            }
        }

Im not sure how "Good" this code is, i was rooting around the csla source for hints and found AcceptChanges() in UndoableBase to be of help, hence the code looking similar to that.

Regards
Devman