SilverlightShow: Working with Prism 4 Part 3: Composite Command and Pub/Sub Events Comments

Re: Working with Prism 4 Part 3: Composite Command and Pub/Sub Events

brian.noyes — Fri, 29 Nov 2013 15:44:37 GMT

Hi Deepaprakash, can you give some more information on what is not working?

Re: Working with Prism 4 Part 3: Composite Command and Pub/Sub Events

deepaprakash — Fri, 29 Nov 2013 07:35:26 GMT

Hi,

The download code is not for working properly. could you please help

Re: Working with Prism 4 Part 3: Composite Command and Pub/Sub Events

brian.noyes — Fri, 24 May 2013 16:29:32 GMT

Hi Edward,

This is a known limitation with the Silverlight tab control and Prism's handling of it. If you take a close look at my sample code I have some workaround code in there for it. Here is a thread that discusses a couple of approaches to solving it as well:

http://stackoverflow.com/questions/6044341/silverlight-5-prismtabcontrolregionadapter

Re: Working with Prism 4 Part 3: Composite Command and Pub/Sub Events

epellis — Thu, 23 May 2013 20:55:54 GMT

Hi Brian - this is a great series on intro to Prism. I am on step 5 above, and am getting an error "The property 'ItemContainerStyle' does not exist on the type 'TabControl' in the XML namespace 'http://www.codeplex.com/prism'." and I am not sure how to fix/work around this Can you help?

Thanks,

Edward Ellis

Re: Working with Prism 4 Part 3: Composite Command and Pub/Sub Events

Nuitari — Tue, 31 Jul 2012 14:08:04 GMT

Thanks Brian, that was the solution! (At WCF RIA Services Part 5 - Metadata and Shared Classes )

Re: Working with Prism 4 Part 3: Composite Command and Pub/Sub Events

brian.noyes — Thu, 26 Jul 2012 21:43:42 GMT

Do you have [Include] attribute on the relation properties in the entities or their metadata? See my series on RIA services for more details about querying with child objects or collections.

Re: Working with Prism 4 Part 3: Composite Command and Pub/Sub Events

Nuitari — Thu, 26 Jul 2012 18:55:34 GMT

Thanks for the article!

I have a problem with the database query returning only null for the foreign keys (Order and Product in Order_Details), I described it in more detail on Stackoverflow. Has someone else had this issue?

Re: Working with Prism 4 Part 3: Composite Command and Pub/Sub Events

gowsar — Thu, 12 Jul 2012 09:27:25 GMT

Dear Brian , your articles very useful for me, i need sample code for that article.

Re: Working with Prism 4 Part 3: Composite Command and Pub/Sub Events

HariI15 — Sat, 11 Feb 2012 00:00:29 GMT

Brian,

Thanks for the speedy response. Please ignore my comment on the inter- module communication. I must have had one of those brain-!*&%( anomalies) when I penned it.

I figured out what was wrong in my app. In the Student Property( in the editview model), I had the curly braces incorrectly set (shown in my prior mail). It should be set as shown below. All is fine now. Thanks.

As far as future articles, Enhancing this application example with Add , Delete, Cancel changes in addition to Edit( which you have now) in a Master -Detail ( Like you have now, eg Nwind Customers- Orders ) with Log in /Password would be appreciated.

Best Regards

Hari

set
            {
                if (itsStudent != value )
                {
                    if (itsStudent != null)
                    {
                        itsStudent.PropertyChanged -= OnStudentChanged;
                    }

                    itsStudent = value;

                    if (itsStudent != null)
                    {
                        itsStudent.PropertyChanged += OnStudentChanged;
                    }

                    RaisePropertyChanged(() => Student);
                }

Re: Working with Prism 4 Part 3: Composite Command and Pub/Sub Events

HariI15 — Fri, 10 Feb 2012 19:57:52 GMT

Brian,

Thanks for the speedy response. Please ignore my comment on the inter- module communication. I must have had one of those brain-!*&%( anomalies) when I penned it.

Best Regards

Hari

Re: Working with Prism 4 Part 3: Composite Command and Pub/Sub Events

brian.noyes — Thu, 09 Feb 2012 22:55:17 GMT

Hi Hari,

I'm confused by your comment - this is the article on inter-module communication....

As far as your question, I'm not clear on what is not working for you. Is it that the Student property never gets set with selections in the view, or is it that the Title does not get read and used for the tab header when the Student does get set? If the latter, the problem is that you need to RaisePropertyChanged(()=>Title) in the Student setter since that property depends on the value of the Student. That gets the binding to request the value of the property again, and it will pick up the newly set student value.

Re: Working with Prism 4 Part 3: Composite Command and Pub/Sub Events

HariI15 — Wed, 08 Feb 2012 17:07:31 GMT

Hi Brian,

I am really enjoying your articles . The series is very much needed!! I can't wait for your inter-module communications. I could use your help on a small issue . The problem code is below. The "Student" property defined in the editViewModel class does not get assigned the "Selected Student". The application runs beautifully but always shows a tab with "empty" title. I would be grateful for any help you can provide

Best regards

Hari

(Code in the StudentListViewModel class)

if (!alreadyExists)
            {
                StudentEditView editview = new StudentEditView();
                StudentEditViewModel editVm = new StudentEditViewModel { Student = SelectedStudent };
                editview.DataContext = editVm;
                secondaryContentRegion.Add(editview);
                secondaryContentRegion.Activate(editview);

            }

(Code in the StudentEditViewModel class)

public Person Student
        {
            get
            {
                return itsStudent;
            }
            set
            {
                if(itsStudent != value)
                {
                    if(itsStudent != null)
                    {
                        itsStudent = value;
                        itsStudent.PropertyChanged -= OnStudentChanged;
                        itsStudent.PropertyChanged += OnStudentChanged;
                        RaisePropertyChanged(() => Student);
                    }
                }
            }
        }

public string Title
        {
            get
            {
                return itsStudent != null ? itsStudent.LastName : "Empty";
            }

        }

Re: Working with Prism 4 Part 3: Composite Command and Pub/Sub Events

brian.noyes — Wed, 01 Feb 2012 15:14:29 GMT

In the next one I am going to cover the new navigation features of Prism 4. After that, I plan on one showing how to implement a custom module loader that looks up what modules to load based on the authenticated user (using RIA Services security for the authentication). After that I am open to suggestions.

Re: Working with Prism 4 Part 3: Composite Command and Pub/Sub Events

jaygittings — Tue, 31 Jan 2012 20:30:51 GMT

Brian, thank you for this great series of articles. I have been wrestling with Prism and this is one of the best practical use introductions I've found. Keep up the good work. Any plans for more advanced topics on Prism?