Re: Combo Box Question: I am embarrassed to ask... - WPF Discussion Boards

BlitzPackage13-Feb-09 18:38

BlitzPackage

13-Feb-09 18:38

Sure:

<code>
<ComboBox IsSynchronizedWithCurrentItem="False" HorizontalAlignment="Left" Margin="0,8,0,13.01" Width="100.88" Grid.Column="1" Height="23" FontFamily="./..\Fonts\Arial" FontSize="11" x:Name="ComboBoxMonthStart" ItemsSource="{Binding Mode=OneWay}" ItemTemplate="{DynamicResource DataTemplateComboBoxList}" MaxDropDownHeight="150" SelectedIndex="0"/>
</code>

Mark Salsbery14-Feb-09 6:36

14-Feb-09 6:36

Thanks!

I can't reproduce the problem.

I took your code and only changed the ItemTemplate since I don't have yours:

<ComboBox IsSynchronizedWithCurrentItem="False"
              HorizontalAlignment="Left"
              Margin="0,8,0,13.01" Width="100.88"
              Grid.Column="1"
              Height="23"
              FontFamily="./..\Fonts\Arial"
              FontSize="11"
              x:Name="ComboBoxMonthStart"
              ItemsSource="{Binding Mode=OneWay}"

              MaxDropDownHeight="150" SelectedIndex="0" >
    <!--ItemTemplate="{DynamicResource DataTemplateComboBoxList}" -->
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Path=Name}" />
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>

Works as expected...

Something possibly in your ItemTemplate?

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

Pete O'Hanlon16-Feb-09 0:00

Pete O'Hanlon

16-Feb-09 0:00

When you say "it still shows the name it showed when it was constructed and displayed.", are you referring to the combo box itself (i.e. the text never changes, regardless of what you select), or are you talking about the value in the model behind the scenes?

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

My blog | My articles | MoXAML PowerToys

BlitzPackage16-Feb-09 3:25

BlitzPackage

16-Feb-09 3:25

First, thanks to both of you for replying.

I looked at your code, Mark, and I still don't understand why mines is not working.

Pete, indeed, no matter what I select, the selection in the combobox remains the same.

I'm open to any ideas.

Thanks,
Blitz

Jammer16-Feb-09 4:41

Jammer

16-Feb-09 4:41

If memory serves me correctly there are two event fired when you select something in a combobox ... one happens BEFORE the actual selection is changed and one happens as a result of the change ... I think your listening to the wrong one ...

Damn, my memory is terribly for these things ... i'll see if I can knock up an example ...

Jammer
My Blog | Article(s)

Jammer16-Feb-09 4:55

Jammer

16-Feb-09 4:55

Hmm ... barking up the wrong tree there!

This seems to work ...

public partial class Window1 : Window
{
    public ObservableCollection<string> Data = new ObservableCollection<string>();

    public Window1()
    {
        InitializeComponent();
        Populate();
        comboBox1.ItemsSource = Data;
    }

    public void Populate()
    {
        Data.Add("Boo!");
        Data.Add("Ahhhhh!");
        Data.Add("Gotcha!");
    }

    private void comboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        string s = e.AddedItems[1].ToString();
    }
}</string></string>

hmm ... not much help I know ...

Jammer
My Blog | Article(s)

Pete O'Hanlon16-Feb-09 5:17

Pete O'Hanlon

16-Feb-09 5:17

Blitz - if you want to send me your code at pete dot ohanlon at gmail dot com, I'll take a look at it tonight.

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

My blog | My articles | MoXAML PowerToys

Mark Salsbery16-Feb-09 5:49

Silverlight ScaleMode does not work (solved) [modified]

16-Feb-09 5:49

Maybe something in your ItemTemplate, which is used to
display the selected item as well as items in the list.

Mark

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

Losing UI

Joe Woodbury13-Feb-09 10:39

Joe Woodbury

13-Feb-09 10:39

On our XP embedded systems, we have two units where WPF applications suddenly stopped showing their UI, though the program continues to run (at a high CPU utilization.) I've done all sorts of trace and diffs and the failing app definitely does something slightly different when coming up. The problem is that this isn't showing me what caused it. The suspicion, even from Microsoft, is that a registry key got changed. Has anyone seen this phenomenon and/or know what might cause WPF to fail?

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Kevin McFarlane12-Feb-09 22:29

Kevin McFarlane

12-Feb-09 22:29

When I set ScaleMode="Stretch" or ScaleMode="Zoom" as in this article

Silverlight Tip of the Day #81 – How to Scale your Silverlight Control[^]

the control just disappears with no error messages. Any ideas?

Update: I've gotten to the bottom of this now. I created a new app. and it worked. It turns out that in my existing apps. my user controls were missing width and height that had been removed for other reasons. These are also necessary if you use transforms such as ScaleTransform or TranslateTransform. In my previous experiments I had specified the width and height in code but this won't work for the ScaleMode setting. It needs to see them in the XAML I think.

Last modified: 2hrs 16mins after originally posted --

Resizing of Silverlight content according to screen resolution

Kevin McFarlane12-Feb-09 9:50

Kevin McFarlane

12-Feb-09 9:50

I've been trying to solve this problem without success for a couple of days. I discovered this post

How About Some Code? Simple Scaled Resizing In Silverlight 2 Beta 1[^]

This is really about resizing the content as the browser resizes within the same screen resolution. But I thought it would be a useful place to start. The problem is that it breaks down when I switch down from 1280 x 1024 to 1024 x 768, e.g., text no longer fits, etc. Is there a way of automatically resizing fonts for different screen resolutions or do I have no choice but to apply a scale factor to each conrol individually?

Kevin

Message Removed

12-Feb-09 5:57

N_tro_P

12-Feb-09 5:57

Message Removed

Re: The Project type is not supported by this installation

Mark Salsbery13-Feb-09 7:22

Global.asax in Silverlight?

13-Feb-09 7:22

Collin Jasnoch wrote:
I would expect most of the projects to be 2008

Apparently your expectations are too high.

You could contact the authors and demand they upgrade their projects to 2008...

Poke tongue | ;-P

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

devvvy12-Feb-09 4:18

12-Feb-09 4:18

Global.asax in Silverlight? I see there's a web.config (to my delight actually, just installed Silverlight it's my first try) but where would you put global init code in a silverlight app?

Thanks!

dev

Mark Salsbery12-Feb-09 5:42

12-Feb-09 5:42

Silverlight runs client-side...initialization is the same as for
any stand-alone application.

The System.Windows.Application class is the entry point...

Mark

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

devvvy12-Feb-09 14:15

12-Feb-09 14:15

Wait a minute I just added Global.asax and Application_Start to my silverlight project

My new silverlight project even came with good old web.config - I don't even need to rewrite code so it feeds on XAML as in case of WPF.

thanks

dev

Mark Salsbery12-Feb-09 14:23

12-Feb-09 14:23

devvvy wrote:
I just added Global.asax

devvvy wrote:
My new silverlight project even came with good old web.config

Are you referring to the sample web project created to host your Silverlight app?
If so, that is a web app, not the Silverlight app.
Silverlight apps don't use a web.config - they run on the client.

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

devvvy13-Feb-09 21:24

13-Feb-09 21:24

goodness... i looked closer. The web.config resides in ASP.NET project which is hosting the xap/Silverlight app. Also, I have a class library which I cannot reference from within the Silverlight project (not to mention log4net/nhibernate/spring.net)

dev

Braulio Dez13-Mar-09 6:24

Braulio Dez

13-Mar-09 6:24

Jejejeje, it's normal to have that confusion when you start developing in Silverlight.

The most similar thing that you can fin in SL is the app object, there you will have global events and method (when the app starts which page to show, when an unhandled exception is thrown...).

If you want to add config data you can make your own XML and add it as a resource, another option is to read settings using a WCF services (in order to store them on the server side).

/// -------------------------
     Braulio Díez

     DBSchemaEditor.com
     Free Silverlight based DB Schema Modeling Tool
/// -------------------------

devvvy13-Mar-09 14:33

How to get an Obejct from WPF ListBox??

13-Mar-09 14:33

Thanks mate, I got that one.

dev

saku6912-Feb-09 3:41

saku69

12-Feb-09 3:41

Hey,
I am trying to get an object from my WPF ListBox. I have a WPF usercontrol(ResultsControl) and it uses a Listbox(lbResults) to Display my custom Objects from a Win form. I am making a new WPF usercontrol(ShowInfoUserControl) to display my custom object's information. The showInfoUserControl should only become visible with the objects's information, when I press on an object in the WPF ListBox. I use Hyperlink to tick the showInfoUserControl. I have tried to lbResults.SelectedItem and lbResults.SelectedValue without luck. Could any one help me please? Every advice will be grateful.
my method to get my custom objects (code behind for ResultsControl)

public void GetResults(Result result)   
         {   
             WPFResult wpfResult = new WPFhResult(result.ObjectId, result.Header, result.Name);   
   
             searchResultsList.Add(wpfSearchResult);   
                   
             lbResults.ItemsSource = resultsList;               
         }

private void Windows_Loaded(object sender, RoutedEventArgs e)   
         {               
             AddHandler(Hyperlink.ClickEvent, (RoutedEventHandler)Infocard_Click);   
         }

method to call the ShowInfoUserControl

private void Infocard_Click(object sender, RoutedEventArgs e)   
        {   
            ShowInfoUserControl infocard = new ShowInfoUserControl();             
            infocard.GetInfocard((Result)lbSearchResults.SelectedValue);   
            //infocard.GetInfocard((Result)lbSearchResults.SelectedItem);   
        }

These are my code behind in ShowInfoUserControl

public void GetInfocard(Result result)   
         {   
             Header.Text = result.Header;   
             Name.Text = result.Name;   
          }

my Xaml code for ShowInfoUserControl

<UserControl x:Class="WpfResultsControl.ShowInfoUserControl"  
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
     xmlns:svc="clr-namespace:WpfResultsControl"            
     Height="200" Width="200">   
     <Grid>  
         <StackPanel>  
             <TextBlock x:Name="Header" FontFamily="Tahoma" FontSize="8"></TextBlock>  
             <TextBlock x:Name="Name" FontFamily="Tahoma" FontSize="4"></TextBlock>  
        </StackPanel>               
    </Grid>  
</UserControl>

Many thanks in advance.

ABitSmart12-Feb-09 15:53

ABitSmart

12-Feb-09 15:53

saku69 wrote:
lbResults.ItemsSource = resultsList;

What is type of resultsList ??

saku69 wrote:
infocard.GetInfocard((Result)lbSearchResults.SelectedValue);
//infocard.GetInfocard((Result)lbSearchResults.SelectedItem);

Is resultsList a collection of Result objects ? If yes, then the above statement should work (if something is selected in the listbox i.e.)

What does lbSearchResults.SelectedItem show on the click handler ?

saku6912-Feb-09 17:42

saku69

12-Feb-09 17:42

Is resultsList a collection of Result objects ? If yes, then the above statement should work (if something is selected in the listbox i.e.)

yes, the resultList is a collection that contains custom objecs.

What does lbSearchResults.SelectedItem show on the click handler ?
It should show a new WPF user control with obeject's info.

I use Hyperlink to tick the click handler.

ABitSmart12-Feb-09 17:51

ABitSmart

12-Feb-09 17:51

saku69 wrote:
contains custom objecs.

What is the type of the custom object ? Because when you bind to the List that would be the object you would getting as the SelectedItem. You would have to cast the SelectedItem based on that type.
e.g.

CustomObject selObject = ((sender as ListBox).SelectedItem) as CustomObject;

saku69 wrote:
What does lbSearchResults.SelectedItem show on the click handler ?

I meant, when you debug it using a breakpoint in the click method what is the value showing for lbSearchResults.SelectedItem ? This should tell you which object is actually being returned as the SelectedItem.