ListView SelectedValue Binding issue - WPF Discussion Boards

Yes. Generating the proxy from commandline using SlSvcUtil.exe is supported in Silverlight 3 C:\Program Files\Microsoft SDKs\Silverlight\v3.0\Tools.

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

Microsoft MVP (Silverlight), WPF/Silverlight Insiders

I meant I assumed the OP was hand-writing the service proxy code Smile | :)

I appreciate the info though!

Cheers,
Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Mark Salsbery wrote:
It doesn't matter if the service operation is implemented sync or async on the server.

Silverlight is on the client end independent of the server, and service operations
MUST be implemented async in Silverlight. That means specifying AsyncPattern=true
on your OperationContractAttributes and implementing your interface methods with the
BeginOperation/EndOperation pattern

implementing your interface methods with the
BeginOperation/EndOperation pattern

What interface??? I have only one interface on server side.It marked with ServiceContract attribute.
No more interfaces except generated by svcutil(if i use it)
And that serverside interface and it`s implementation=wcf service,it doesn`t contain ANY async pattern methods.
When i write wcf service i don`t want to think "Oh my client will be sl application,then i need async pattern for my methods".
So how can i generate proxy for such a contract without using svcutil.
It`s not possible to use ChannelFactory because it creates sl proxy only for service contracts with async pattern methods.

Is there any reason why you don't want to use svcutil or "Service Reference"?

We have a lot of WCF services that are consumed by WPF, Silverlight and ASP.NET 3.5 in our project. We don't implement any BeginOperation or EndOperation or any sync or async pattern.

The "async" option is ticked by default when we are generating the proxy for Silverlight so we can use the code like service.GetDataAsync() and service.GetDataCompleted automatically.

But we don't tick "async" option when we are generating the proxy for WPF and ASP.NET so we can use service.GetData(); ...

I would like to know more details about why you don't want to use "Service Reference" or svctil utility.

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

Microsoft MVP (Silverlight), WPF/Silverlight Insiders

Michael Sync wrote:

I would like to know more details about why you don't want to use "Service Reference" or svctil utility

We have some kind of repository of wcfs.And it dynamically adds and removes wcfs.
So client can ask repository for service proxy knowing only service contract.And repository should generate proxy manually.
Repository will generate proxy with sync methods for all clients except silverlight and should generate proxy for silverlight with async methods.But because all is dynamic we cant use Add Service Reference.

I am doing most of my WCF services "near" sync in Silverlight 3 based on this article Synchronous Web Service Calls with Silverlight 2: Dispelling the async-only myth[^].

Basically I add the service reference as per normal, then generate the channel factory as below:

ThreadPool.QueueUserWorkItem(delegate
{
	var channelFactory = new ChannelFactory<IDataService>("*");
	var dataService = channelFactory.CreateChannel();
	var asyncResult = dataService.BeginSaveMethod(dataObject, null, null);
	newInfonMachineActiveDefinition.Id = dataService.EndSaveMethod(asyncResult);

	if (Dispatcher.CheckAccess())
	{
		Visibility = Visibility.Collapsed;
	}
	else
	Dispatcher.BeginInvoke(delegate
	{
		Visibility = Visibility.Collapsed;
	});
});

NOTE: I have not shown any exception handling here to keep the code simpler

It is important that you call the Dispatcher from the same thread that is executing the "sync" call else your UI is not going to wait for the call to finish...

This approach has one major downside, the call must be done form code behind of the control and not from a proxy class in your client, but you can try to refactor it to pass a delegate to your proxy class that will be called from the Dispatcher, or something like that...

____________________________________________________________
Be brave little warrior, be VERY brave

use syncwcf library from codeplex: http://syncwcf.codeplex.com it doees exactly what you need: allows to use the sync-style service interface without writing nor generating code for them

Hi all,

I have a simple listview that has a currently selected item binding as follow:

<ListView HorizontalAlignment="Left" Width="300" Name="ServiceListView" SelectionChanged="ServiceListView_SelectionChanged" SelectedValue="{Binding CurrentlySelectedService}" Grid.Row="0" Grid.RowSpan="2" Grid.Column="0">
      <ListView.View>
        <GridView>
          <GridViewColumn Header="Machine">
            <GridViewColumn.CellTemplate>
              <DataTemplate>
                <Label x:Name="ServiceNames" Content="{Binding ServiceController.MachineName}" />
              </DataTemplate>
            </GridViewColumn.CellTemplate>
          </GridViewColumn>
          <GridViewColumn Header="Service Names">
            <GridViewColumn.CellTemplate>
              <DataTemplate>
                <Label x:Name="ServiceNames" Content="{Binding ServiceController.ServiceName}" />
              </DataTemplate>
            </GridViewColumn.CellTemplate>
          </GridViewColumn>
          <GridViewColumn Header="Service status">
            <GridViewColumn.CellTemplate>
              <DataTemplate>
                <Label Width="80" x:Name="ServiceStatus" Content="{Binding ServiceController.CurrentStatus}" Background="{Binding ServiceController.ServiceStatusColour}" />
              </DataTemplate>
            </GridViewColumn.CellTemplate>
          </GridViewColumn>
        </GridView>
      </ListView.View>
    </ListView>

And obviously in the constructor I do the following to enable bindings:

DataContext = this;

The problem:
The binding to SelectedValue="{Binding CurrentlySelectedService}" works 100% (well, sort of).

In my DEV environment it works 100% and the currently selected item works 100%.
But for some or other reason when I deploy this to a Windows server 2003 box (with .Net 3.5 installed), the binding doesn't work anymore...
How can I debug this issue?
Has anyone experienced this problem before?

This is not my first time experiencing this problem. I've seen this a few times now, but it seems to be very PC specific. It will work 100% on one pc, and then completely FAILS on another.

Any help would be much appreciated.

You need Snoop[^] - run it on the target machine, and see what your listview thinks the DataContext is.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Got snoop ... didn't think of using it.

Why the DataContext ? If the DataContext is not the correct one, how does one go about setting the correct one ...?

The reason I suggested this, is that it sounds like the DataContext is behaving differently between the two machines. Snoop can be used to help you determine if this is the case.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

i have thousands of data to be bound in the combobox. it takes minutes to display the popup while clicking the combo. i have heared about the virtualisation. but how it could be applied to the ComboBox.

I would say that thousands of data should not be binded to the combobox. It will make the combobox very ugly and very slow to load. You should probably use another control (e.g. datagrid or listbox with paging.)

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

Microsoft MVP (Silverlight), WPF/Silverlight Insiders

I'd have to agree there. It's one thing to get them in the drop down, but then the user will have to select them. This sounds more like a pattern for doing a look ahead box or something similar (a text box that as you type, begins to build a partial drop down based on the text you've already entered).

If you had to do it for some reason, the key would be:

1. Use an ObservableCollection<t> when you bind to the list. This will make the control aware when the list changes.
2. Append to the list over time

That's more tricky - the async calls of course fire when done so you have the entire list and you'd still be waiting. Better would be to find a way to chunk up your calls, i.e. perhaps call alphabetically and bring back everything beginning with A, then B, etc. Then append to the list. This will make the drop down appear sooner and it will grow dynamically, but the question then becomes - is this even useful, if the user still has to wait a minute for a full drop down?

Jeremy Likness
Latest Article: Hierarchal Data Templates in Silverlight
Blog:
http://csharperimage.jeremylikness.com/

Hi,

I am working on RSS feeds using silver light. In this I need to access each item(feed) from the RSS feeds link and display it in my silver light application. I implemented a code for this but by this I am able to access only some RSS feeds only. It is not working for all the RSS links. I am getting error while accessing the feed items from RSS feeds.

Please reply me if anyone have any idea how I can make it work for all the RSS links and solve this error while accessing.

The code I have used is from:

http://www.dotnetcurry.com/ShowArticle.aspx?ID=252

Thanks in advance.

Hello,

Can you try this one http://www.codeplex.com/SilverlightGallery/Release/ProjectReleases.aspx?ReleaseId=11740[^]??

Let me know if you are still having problems.

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

Microsoft MVP (Silverlight), WPF/Silverlight Insiders

Message Removed

Basically, this binds the data context of the ItemsSource to the data context of the ItemsControl (which works it's way up the visual tree until it finds a data context). This means that the datacontext you are looking for is assigned here:

c.DataContext = (null == c.DataContext) ? _letterDatas : null;

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Hi Guys,

In the general xaml code, i have written as follows,
<pre>Page x:Class="UI_eHTMP.Window1" Title="eHTMP Application"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="800" Width="1400" Loaded="Window_Loaded" Title="applc1" Background="OldLace"></page></pre>

when I run the appliction and try to restore and Maximize the windows page, i dont see the task bar and vertical and horizantal scroll bars to scroll,

what to be included in the xaml code? Even the title is also not displayed when i have mentioned in the xaml title.

Please help me in resolvign this.

Thank you,
Ramm

0) I don't see in the XAML you posted where you're telling the window to scroll.

1) Scrollbars are typically set to "Auto" so they only appear when scrolling is needed.

2) Learn how to post code here. It's ALMOST IMPOSSIBLE to read code when it's posted with a proportional font.

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Hi John,

In the 3rd line of my post, i have entered the xaml code.. just the first few lines..

Thank You,
Ramm

Guys,

I am able to scroll it now using <ScrollViewer></ScrollViewer>..
I removed the Height="800" Width="1400" from the xaml code.. its fine now.

Thank you,
Ramm

Hi,

I have a silverlight application with a login page. I want to check login members against Active Directory members and then redirect them to respective pages. I have done Active directory validation in dot net.But in Silverlight, I am unable to find "System.DirectoryServices" dll. Any help regarding this will be very useful.Thanks in advance Smile | :)

.

Gomathi R

You're not going to be able to use Active Directory in a Silverlight app.

You'll need a Windows-specific solution since Active Directory is Windows specific and
Silverlight is not.

You could possibly use Active Directory on a server, maybe through a WCF or other web
service.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

If you are using Silverlight 3 with RIA Service, you may want to check-out this http://silverlight.net/forums/p/107447/243735.aspx[^]

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

Microsoft MVP (Silverlight), WPF/Silverlight Insiders