Search results matching tags 'Data binding' and 'Silverlight'

Re: IdentityConverter and CSLA Silverlight

RockfordLhotka — Wed, 06 Apr 2011 14:48:57 GMT

WPF 3.5 introduced a binding option that solves this problem, so I removed IdentityConverter from CSLA at that point. I don't recall the specific binding option off the top of my head, but there's a way to tell the binding to always refresh.

To my knowledge, Silverlight never had this same issue, I think it was only a WPF binding problem.

IdentityConverter and CSLA Silverlight

MichaelMaddox — Wed, 06 Apr 2011 12:24:20 GMT

There is a blog post by Rocky here talking about IdentityConverter and WPF:

http://www.lhotka.net/weblog/DataBindingIssueInWPFWithSolution.aspx

The Csla.Wpf namespace in CSLA 3.8 contains the IdentityConverter class.

In CSLA 4.1, the Csla.Xaml namespace for Silverlight does not appear to contain the IdentityConverter class and this is the only forum post I can find mentioning IdentityConverter and Silverlight, but the issue appears to remain unsolved:

http://forums.lhotka.net/forums/p/8282/39434.aspx

I'm porting a WPF CSLA 3.8 project to Silverlight CSLA 4.1 and I'm having issues with databinding and I'm not sure if the lack of IdentityConverter could be causing the issue. Thoughts?

-Michael

RE: Silverlight binding to IsDirty doesn't change when other properties are changed

Jaans — Wed, 28 Jul 2010 03:29:36 GMT

Hi Rocky

Any news on this? Apologies if this is something that's been implemented for CSLA 4.0 - haven't had the chance to test this out on 4.0 yet.

I'm have a Silverlight project using CSLA 3.8.4 and the issue remains. I'm binding directly to the business object (MVVM will have to wait for later when we can do the whole project), and the property change notifications for the IsDirty, IsSavable, etc. properties aren't happening.

I have a question (based on your earlier comments) --> since Windows Forms binding considers the properties "unbindable", would it not be OK/safe to have CSLA raise the property change notifications anyway?

That way Silverlight / WPF can gain the benefit, without breaking the Windows Forms story? Is this something that can be considered for >= CLSA 3.8.4 ?

Thank you.
Jaans

MVVM Silverlight clear control on error

Ranjini — Wed, 24 Mar 2010 15:17:13 GMT

I am fairly new to mvvm + silverlight concepts and am running into a roadblock. I have a silverlight treecontrol bound to a viewmodel that is refreshed on the click event of a button. My problem is , if for any reason, there is a model binding error, i want to clear the treecontrol and not display anything. Currently, if the model has valid data the first time the button is clicked, the tree populates and if i click the button a second time and due to some problem , the model binding failed, the treecontrol retains its last populated value. I want the behaviour to change so that when there is an error, the treecontrol is cleared , so the UI and model are in sync. I am using Silverlight 3 with CSLA v 3.8.2. Here are my code snippets.

XAML -

<UserControl.Resources>

<this:TreeListViewModel x:Key="TreeListModel" />

<common:HierarchicalDataTemplate x:Key="TreeTemplate" ItemsSource="{Binding Path=TreeNodeList}">

</StackPanel>

</common:HierarchicalDataTemplate>

</ResourceDictionary>

</UserControl.Resources>

<input:AutoCompleteBox x:Name="acbDomain" ItemsSource="{Binding Path=Model}" ValueMemberBinding="{Binding Name}" >

<input:AutoCompleteBox.ItemTemplate>

</DataTemplate>

</input:AutoCompleteBox.ItemTemplate>

</input:AutoCompleteBox>

<controls:TreeView x:Name="treeViewCtrl" Style="{StaticResource SimpleTreeView}" DataContext="{StaticResource TreeListModel}" ItemsSource="{Binding Path=Model}"

ItemTemplate="{StaticResource TreeTemplate}" />

Code Behind –

private void btnSetDomain_Click(object sender, RoutedEventArgs e)

{

Guid domainId = ((DomainInfo)acbDomain.SelectedItem).Id; ((TreeListViewModel)this.Resources["TreeListModel"]).GetTreeNodes(domainId);

}

Thanks

Ranjini

Binding Silverlight treeview control - MVVM

Larry — Wed, 10 Mar 2010 15:47:33 GMT

There have been several earlier posts regarding binding BOs to treeview controls in Windows Forms and Web forms but we are trying to bind to Silverlight treeview using MVVM with a Csla based tree structure that is retrieved from the db. Because the number of levels of the tree (and the tree nodes) is variable depending on the criteria for the query we would like to have the implementation be somewhat generic. That is, the number of levels and the number of tree nodes at each levels is determined at runtime.

An example of a generic tree implementation for Silverlight can be found on Justin Angel's blog at
(http://blogs.silverlight.net/blogs/justinangel/archive/2008/11/18/silverlight-toolkit-treeview-treeviewitem-amp-hierarchaldatatemplate.aspx). It is a rather long article but about midway he describes a simple treecontrol that uses the XAML "HierarchicalDataTemplate" and he binds the tree to a list (at page load) that populates the tree control - it works nicely. Has anyone done a similar implementation using SL/MVVM with Csla?

We tried populating a hierarchical structure with BusinessListBase -> BusinessBase and enabled the tree control to bind to the Model but it only displays the first level of the tree. Any property of the first level can be bound and displayed but we couldn't get the second level to display even though we can verify that the root object does have populated children/grandchildren nodes.

Larry

Re: How to use an object as FactoryParameter in a (xaml) CslaDataProvider

Peer — Fri, 19 Feb 2010 07:57:51 GMT

Rocky, thanks for the streight and complete answer, It's appreciated and sets me on the right track. Maybe it is an Idea to inform the community (more specific: people who are learnig with the Video's) about this possible step. I have to focus on another technique. You gave me a hint ( MVVM) in an earlier reply so I'll go on whith that. Two steps ahead, 1 step back ! ... Is the MVVMExperimentSL solution a good example using this pattern ? I read the thread about the videos so Maybe I should be patient and concentrate for now on Csla core techniques...

If you step back and have an overview of the whole SL development it is pretty obvious it is far from mature. Techniques will be exchanged in the next years and we will be running and cleaning up the mess. (It probably keeps us in good shape ;) )

Peer

Re: Binding WPF Page to Csla Object

GreggR — Wed, 17 Feb 2010 23:50:27 GMT

Thank you for the reply. I was able to bind to the object and my data is saving, but I'm still having some trouble implementing the CslaDataProvider (would like to for the error handling if nothing else).

Your first reply raises a bigger question. What would you recommend for an internet accessible application? Would I be better off using WPF forms, web services, with a click once deploy? What about Silverlight? I am at the beginning stages of this project and want to make sure I'm heading in the right direction.

One more, unrelated question. We have another project in the works that is using windows forms. You have hinted that Microsoft is steering away from windows forms. How concerned should we be about them dropping support in the near future? Concerned enough to start over with WPF screens instead?

Thanks again for the input.