, as a child of a parent BO.
>
>The parent can have many notes records, like an activity list.
>
>The interface shows old notes as Read Only (formated in a label) and allows appending a new note from a textBox. The formatting requires (so far as I can see) non-binding controls.
>
>I want to have the child save participate in the parent save transaction. But it's tricky.
>
>1)----------------------------------------
>
>To add, I'm doing:
>>// the real code saves user, date, status codes, etc. to Note object
>public static void AppendNote(mmBindingList<NoteEntity> eNotes,
> string s)
>{
> if (!mmUtils.Empty(s))
> {
> NoteEntity note = eNotes.AddNew();
> note.someString = s;
> eNotes.EndNew(eNotes.Count);
> }
>}
>>But when I go to save, the BO DataSet isn't changed.
>
>This (below) works, but is there a better way to do it?
>>public static void AppendNote(mmBindingList<NoteEntity> eNotes,
> NoteBusinessObject oNote,
> string s)
>{
> if (!mmUtils.Empty(s))
> {
> NoteEntity note = eNotes.AddNew();
> note.SetDataRow(oNote.NewRow()); // NEW code to set row *******
> note.someString = s;
> eNotes.EndNew(eList.Count)
> }
>}
>>
>2)----------------------------------------
>
>The save code, if NOT mmSaveDataResult.RulesPassed, has to roll back the note.
>
>>// App_code Note utilities
>public class NoteUI
>{
>// NEW change to return count of Note List
>public static int AppendNote(mmBindingList<NoteEntity> eNotes,
> NoteBusinessObject oNote,
> string s)
>{
> int count = 0;
>
> if (!mmUtils.Empty(s))
> {
> NoteEntity note = eNotes.AddNew();
> note.SetDataRow(oNote.NewRow()); // NEW code *******
> note.someString = s;
> eNotes.EndNew(eList.Count);
>
> count = eList.Count;
> }
> return count;
>}
>}
>
>// myPage.aspx.cs
>// ...
>private void DoBasicSave()
>{
> // always save new comments
> int noteCount = NoteUI.AppendNote(eNotes, oNote, this.txtComments.Text);
>
> // Save the DataSet (automatically binds back)
> mmSaveDataResult saveResult = this.Save(this.oParent, this.dsParent);
>
> if (saveResult == mmSaveDataResult.RulesPassed)
> {
> // go back to list
> Response.Redirect("default.aspx");
> }
> else
> {
> // some kind of error, roll back comment to NOT save repeatedly
> if (noteCount > 0)
> {
> eNotes.RemoveAt(noteCount);
> }
> }
>}
>>I would imagine this is a somewhat common problem. Anyone have a better way to do it?
It's hard to get the full sense of what you're doing as I look at the code outside the context of your application, but are you aware that if you register a business oject as a child object, MM .NET will automatically roll back the transaction for parent/child for you? Check out the MM .NET Dev Guide topic "Working with Transactions" for details.
Best Regards,
Kevin McNeish
Eight-Time .NET MVP
VFP and iOS Author, Speaker & Trainer
Oak Leaf Enterprises, Inc.
Chief Architect, MM Framework
http://www.oakleafsd.com
