Silverlight Controls and Silverlight Toolkit

Re: Re: Re: CollectionView in Silverlight 3

dashcream — Wed, 05 Aug 2009 06:17:54 GMT

I am using SL2 application with SL2 grid only.

I am using ObservableCollection.

And everytime we are inserting values into database and then getting all the values of a table to display in the grid again.

So to diaply the latest values again into the grid, everytime i am re-assiging the result (observablecollection) to the itemsource of the grid.

grid.ItemSource = e.Result;

As we are using ObservableCollection, it implements INotifyPropertyChanged.

Could you please help to resolve it

Thanks in advance.

Re: Re: Re: CollectionView in Silverlight 3

Brian Braeckel — Tue, 04 Aug 2009 17:25:15 GMT

The December release is only for Silverlight 2 applications, you can't use it with Silverlight 3. All of the bug fixes and modifications that were made to the SL2 DataGrid for the December release were included in the SL3 DataGrid.

If you're having an issue with empty rows, it's probably something else. Could you be more specific as to the issue you're running into? What type of collection are you using? Does your data object implement INotifyPropertyChanged? How are you adding a new item?

Re: Re: Re: CollectionView in Silverlight 3

dashcream — Tue, 04 Aug 2009 15:06:53 GMT

Hi All,

I am also getting the the problem of empty row appearing in the grid instead of the new added row or modified row.

To resolve that error i have added the new Controls.Data.Dll (december 2008)into my project.

After adding that dll into my project

I am getting below error

Could not load file or assembly 'System.Windows.Controls.Data, Version=2.0.5.0, Culture=neutral, PublicKeyToken=3d8c6023c75a3242' or one of its dependencies. The system cannot find the file specified.

I have followed the same way to replace the dll in my system as mentioned in the guidelines.

Please help me to resolve this ASAP.

-Thanks and Regards,

Re: Re: Re: CollectionView in Silverlight 3

justintoth — Mon, 18 May 2009 23:38:09 GMT

Thanks for this update, I was having the issue when removing rows from my DataGrid that empty rows would appear and this fixed it!

Re: Re: CollectionView in Silverlight 3

Gengis — Tue, 28 Apr 2009 21:26:07 GMT

@yifung : the blank list item is selected by default but as soon as you select another item (one provided by in the ItemsSource) it becomes unavailable. So you have to insert a new instance at the first position of your list before setting the items source.

Concerning the validation : do you consider an alternative to the DataAnnotations ? How would you apply validation when entities are local representations of remote objects (typically in a silverlight <=> wcf application) ? Would you directly work on the generated classes (in reference.cs) ?! In this case validation through xaml control (like requiredFiledValidator) seems more suitable.

And by the way thanks for Fault support and binaryHttpBinding.

Re: CollectionView in Silverlight 3

yifung — Mon, 27 Apr 2009 18:02:46 GMT

In Silverlight 3, there is a PagedCollectionView that is a CollectionView implementation that does paging as well. In the SL 3 Beta, it is in the System.ComponentModel.dll that comes with the SDK; however, in the RTM release of SL 3, it will be in the System.Windows.Data.dll.

Field validation is available in Silverlight 3 using the same DataAnnotations attributes that are available for ASP.NET. I thought the ComboBox already has nothing selected (blank item) by default.

CollectionView in Silverlight 3

jemiller — Sun, 26 Apr 2009 03:06:16 GMT

Does anyone know if the System.Windows.Data.CollectionView class is included with Silverlight 3? I don't see it in the Beta documentation. That will be a shame if it's still missing in Silverlight 3 RTM.

Re: Re: Silverlight 2 DataGrid December 2008 Release

Gengis — Sat, 11 Apr 2009 01:22:49 GMT

Brian : I followed Yifung's suggestion, putting the datagrid in a grid (with Grid.Row and Grid.Column) is cleary better than putting it in a StackPanel. Not as fast as a listbox but not so far. I think that mixing StackPanel and DataGrid should be more clearly discouraged.

Maybe it's off topic but I do not understand why SL still does not meet all the basic needs of a business application, trivial feature like 'field validation' or 'having a first item blank in a ComboBox' or 'handling wcf exceptions or fault' are not provided out of the box. When you come from asp.net it is a bit confusing to see that such simple features are missing, for each of them you waste time at searching on the web if you did not miss something and then you waste time at implementing them yourself in the less ugly manner.

Re: Silverlight 2 DataGrid December 2008 Release

Brian Braeckel — Fri, 10 Apr 2009 19:31:21 GMT

Gengis - There isn't much more I can add than what Yifung has said in the threads you reference. The DataGrid is a more complex control than ListBox, and chances are that there are many more visuals being created when it loads. A DataGrid with 50 rows and 10 columns is like having 10 ListBoxes with 50 items each. One benefit of the DataGrid, however, is that it virtualizes its rows, so the initial load time is dependent on the number of visible elements rather than the number of items in the ItemsSource -- the ListBox will create visual elements for all of its items, even if they are scrolled out of view. Having said all of that, though, the SL3 DataGrid should have faster load times than it did with SL2. Have you had a chance to try the SL3 beta yet?

Alan - I'm sorry you had to lose your toolbox mappings when you upgraded the DataGrid. We wanted to get a new version out for you guys quickly, and I apologize if it was inconvenient. Thanks for the feedback.

Re: Silverlight 2 DataGrid December 2008 Release

flashfearless — Fri, 10 Apr 2009 18:04:24 GMT

I personally think that the instructions on the download page are BS. You are making folks remove all of their toolbox mappings for every stinking control that they use? This was a very lazy approach to pushing out these changes, IMHO. It should have been delivered with an MSI, but I guess I should expect nothing less than mediocrity from Microsoft.

Re: Silverlight 2 DataGrid December 2008 Release

Gengis — Wed, 08 Apr 2009 22:33:21 GMT

Hi,

It seems the datagrid is very slow to display data, even with a reasonnable amount of lines (50 lines, 5 to 10 columns).

It takes more than one second to display a collection (binded by setting itemsource property), with listbox it only takes 400 to 500 ms. And with 10 years old asp 3 it takes less than 100 ms ;)

Maybe I missed something but It seems to be a known issue (http://silverlight.net/forums/p/19917/202710.aspx, http://silverlight.net/forums/p/77822/183862.aspx), can we expect improvements ?

Thanks,

Re: Silverlight 2 DataGrid December 2008 Release

shinji14 — Mon, 30 Mar 2009 21:22:39 GMT

Yes, silveright 3 solved my problems, buyt added a few ones, like i have to rebuild the solution to have debug available.

Re: Silverlight 2 DataGrid December 2008 Release

shipn — Mon, 30 Mar 2009 19:07:12 GMT

Did silverlight 3 beta fix your problem?

Re: Silverlight 2 DataGrid December 2008 Release

makerofthings — Tue, 24 Mar 2009 01:41:55 GMT

Does the RIA Serivces Announcement give us a rough timeline as to when virtual mode for the DataTable will be ready? Is there any expected relation between the two?

Re: Silverlight 2 DataGrid December 2008 Release

shinji14 — Wed, 18 Mar 2009 19:41:45 GMT

i have followed those steps exactly,(btw the 4 toolbox files where hidden ) now in my silverlight project oolbox i have no controls :S i only have the grid and the datepicker. the others controls are there but only when i sleect show all(inactive). i tried with devenv /resetskipkgs and /resetsettings and /setup, but nothings happens.

whats worng???. now im installing the silverlight 3 beta toolbox to see if this get repaired, thanks.