SilverlightShow: Paging WCF Ria Services entities in Model-View-ViewModel applications Comments

Re: Paging WCF Ria Services entities in Model-View-ViewModel applications

mateofd — Thu, 22 Dec 2011 21:49:12 GMT

This helped me a lot!!

I had to apply the fixes suggested by HC and I also had to override the Count() method in my DomainService class as mentioned in:

 http://silverlightfeeds.com/post/2900/WCF_RIA_Services_and_TotalEntitiesCount-1.aspx

RE: Paging WCF Ria Services entities in Model-View-ViewModel applications

ielektronick — Mon, 14 Feb 2011 18:20:12 GMT

Thanks! That post is very-very helpful!

RE: Paging WCF Ria Services entities in Model-View-ViewModel applications

Christian Schmidtchen — Tue, 08 Feb 2011 17:25:15 GMT

Thank you, very great article! I have only one question: How I notice that the loading is complete? I have some methods that should start when the data are loades.

RE: Paging WCF Ria Services entities in Model-View-ViewModel applications

Aleksey — Thu, 27 Jan 2011 05:48:11 GMT

Thanks 4 article!

RE: Paging WCF Ria Services entities in Model-View-ViewModel applications

Marc Ederwind — Tue, 14 Dec 2010 16:04:09 GMT

Nice work but it seams that your PagedDataSource does not notify the interface when an entity is added or removed from the inner EntitySet....

RE: Paging WCF Ria Services entities in Model-View-ViewModel applications

Andrea Boschin — Sun, 14 Nov 2010 11:08:02 GMT

cachig is not implemented. you can do it by yourself in the method that retrieve the data.

RE: Paging WCF Ria Services entities in Model-View-ViewModel applications

Eyad Al-Hodiani — Sun, 14 Nov 2010 11:04:33 GMT

This is a great article, but i have some issues about performance , how can i get data from webservice just one time.

In your example in every change in page index , we need to request the data from webservice.

RE: Paging WCF Ria Services entities in Model-View-ViewModel applications

Long Xue — Fri, 05 Nov 2010 18:44:19 GMT

Excellent article, Andrea.

The behavior HC mentioned happened to me as well, HC's solution fixed it.

Best regards,

Long Xue

RE: Paging WCF Ria Services entities in Model-View-ViewModel applications

HC — Mon, 25 Oct 2010 15:39:16 GMT

Yes, i'm referring to the attached project.

When i run the project if i click last page in the DataPager and after that i click the next page the datapager goes to the next page.

RE: Paging WCF Ria Services entities in Model-View-ViewModel applications

Andrea Boschin — Mon, 25 Oct 2010 14:50:02 GMT

Are you referring to the attached project? I didn't observed the described behavior in my example. Are you sure your ria service is returning the correct TotalEntitiesCount?

bye.

RE: Paging WCF Ria Services entities in Model-View-ViewModel applications

HC — Mon, 25 Oct 2010 14:29:10 GMT

Hello,

You have some bugs in the class PagedDataSource. That bugs made possible to go after the last page in the DataPager.

Changes need to fix that behavior.

public bool MoveToLastPage()
        {
            this.PageIndex = Math.Max(1, (int)Math.Ceiling((double)(((double)this.ItemCount) / ((double)this.PageSize)))) - 1;
            this.Refresh();
            return true;
        }

 public bool MoveToNextPage()
        {
            int maxPage = Math.Max(1, (int)Math.Ceiling((double)(((double)this.ItemCount) / ((double)this.PageSize))));
            if (pageIndex < (maxPage -1))
            {
                this.PageIndex++;
                this.Refresh();
                return true;
            }
 
            return false;
        }

public bool MoveToPage(int pageIndex)
        {
            int maxPage = Math.Max(1, (int)Math.Ceiling((double)(((double)this.ItemCount) / ((double)this.PageSize))));
            if (pageIndex >= 0 && pageIndex < maxPage)
            {
                this.PageIndex = pageIndex;
                this.Refresh();
                return true;
            }
 
            return false;
        }

In the code of the view you have the dataPager, if you register the PageIndexChangedEvent to the following method you disable the next button when in the last page.

 void pager_PageIndexChanged(object sender, EventArgs e)
        {
            var pager = (DataPager)sender;
 
            int pageCount = Math.Max(1, (int)Math.Ceiling((double)(((double)pager.ItemCount) / ((double)pager.PageSize))));
            if (pager.PageIndex == pageCount - 1)
            {
                pager.IsTotalItemCountFixed = true;
            }
            else pager.IsTotalItemCountFixed = false;
 
        }