WPF App - different page than StartupUri getting called... - WPF Discussion Boards

How to make Single instance application to run

Joe Rozario1-Jul-10 2:32

1-Jul-10 2:32

Dear friends,

I have wpf application

i could double click on the exe and N number of instance, but i want only one application to run.

how to do that?

any idea? suggestion?

Thank You

Joe.I

Re: How to make Single instance application to run

Not Active1-Jul-10 2:49

Not Active

1-Jul-10 2:49

Google is your friend
http://www.nathanm.com/csharp-wpf-singleton-application/[^]

I know the language. I've read a book. - _Madmatt

Re: How to make Single instance application to run

Pete O'Hanlon1-Jul-10 2:57

Pete O'Hanlon

1-Jul-10 2:57

You have to take over the creation of the main form yourself, rather than using the StartupUri. A common way to do this is, in the OnStartup, detect whether or not another instance of the application is running by using a system wide mutex. Here's an example that does a basic level of checking:

private Mutex _mutex;
private override OnStartup(StartupEventArgs e)
{
  _mutex = new Mutex(false, @"Global\\MyApplicationIdentifier");
  if (_mutex.WaitOne(0, false))
  {
    base.OnStartup(e);
  }
  else
  {
    Application.Current.Shutdown();
  }
}

"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

Re: How to make Single instance application to run

Joe Rozario4-Jul-10 18:27

Joe Rozario

4-Jul-10 18:27

Thanks Pete O'Hanlon,

It works fine.

Thank you

by

Joe

Re: How to make Single instance application to run

Pete O'Hanlon4-Jul-10 21:50

Pete O'Hanlon

4-Jul-10 21:50

Joe - you're welcome. Glad to help.

"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

Re: How to make Single instance application to run

BechBej4-Jul-10 13:05

BechBej

4-Jul-10 13:05

you have to implement the singleton pattern in this case

move the startupuri attribute form the app.xaml and make the constructor of the statup window as private
then define a static method within the form and instanciate that form within that static method

private LunchWindow()
{
InitializeComponent();
}

static public LunchWindow Singleton()
{
return new LunchWindow();
}

override the OnStartup method of the app.cs and call that static method within the scope of the on startup method

public partial class App : Application
{
protected override void OnStartup(StartupEventArgs e)
{
LunchWindow singleInstance = LunchWindow.Singleton();
singleInstance.Show();
}
}

Re: How to make Single instance application to run

Pete O'Hanlon4-Jul-10 21:49

Pete O'Hanlon

4-Jul-10 21:49

BechBej wrote:
you have to implement the singleton pattern in this case

Errm, no you don't. Unless I am missing something really basic here, a singleton has no effect in this case because the singleton is per application domain.

The generally accepted way to do this is to use a Mutex to determine whether or not there is an instance of the application currently running.

"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

WPF App - different page than StartupUri getting called...

Phil Boyd30-Jun-10 10:34

Phil Boyd

30-Jun-10 10:34

I have a WPF app (that I didn't write - I just have the "pleasure" of fixing). The StartupUri in the app.xaml references mainwindow.xaml. But for some reason, I have a completely different page BasicView.xaml that is getting loaded first, prior to the MainWindow. Any idea what could be causing this?

Thanks

Phil

Re: WPF App - different page than StartupUri getting called...

Pete O'Hanlon30-Jun-10 10:46

Pete O'Hanlon

30-Jun-10 10:46

Check what's in your code behind App.xaml.cs.

"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

Re: WPF App - different page than StartupUri getting called...

BechBej5-Jul-10 9:45

BechBej

5-Jul-10 9:45

Check the code behind at the two levels at the app.cs and at the Mainwindow.cs then tell me whether is there a code there

Problem with Binding to XML in WPF. [Resolved]

Henry Minute30-Jun-10 9:34

Henry Minute

30-Jun-10 9:34

I am using C# Express 2010 on an XP box targeting .Net 4.0.

I have been following some examples from an article in MSDN Magazine[^]

At design time the ListBoxItems are visible, but at run time the ListBox is empty.

Here is the code, this is it, there's no code behind.

<StackPanel>
     <StackPanel.Resources>
         <XmlDataProvider x:Key="MoreColours" XPath="/colours">
             <x:XData>
                 <colours>
                     <colour name="pink"/>
                     <colour name="white"/>
                     <colour name="black"/>
                     <colour name="cyan"/>
                     <colour name="gray"/>
                     <colour name="magenta"/>
                 </colours>
             </x:XData>
         </XmlDataProvider>
     </StackPanel.Resources>
     <TextBlock Width="248" Height="24" Margin="0, 5, 0, 0" Text="Colours:" TextWrapping="Wrap"/>
     <ListBox x:Name="lboxColour" Width="248" Height="56" Margin="0,0,0,3" IsSynchronizedWithCurrentItem="True"
              ItemsSource="{Binding Source={StaticResource MoreColours}, XPath=colour/@name}"/>
     <TextBlock Width="248" Height="24" Margin="0,5,0,0" Text="You selected colour:"/>
     <TextBlock Width="248" Height="24" Text="{Binding ElementName=lboxColour, Path=SelectedItem.Content, Mode=OneWay}"
                Background="{Binding ElementName=lboxColour, Path=SelectedItem.Content, Mode=OneWay}"/>
 </StackPanel>

The results are the same if I extract the XML to an external File, as here

<StackPanel>
    <StackPanel.Resources>
        <XmlDataProvider x:Key="Colours" Source="Colours.xml" XPath="/colours" />
    </StackPanel.Resources>
    <TextBlock Width="248" Height="24" Margin="0, 5, 0, 0" Text="Colours:" TextWrapping="Wrap"/>
    <ListBox x:Name="lboxColour" Width="248" Height="56" Margin="0,0,0,3" IsSynchronizedWithCurrentItem="True"
             ItemsSource="{Binding Source={StaticResource Colours}, XPath=colour/@name}"/>
    <TextBlock Width="248" Height="24" Margin="0,5,0,0" Text="You selected colour:"/>
    <TextBlock Width="248" Height="24" Text="{Binding ElementName=lboxColour, Path=SelectedItem.Content, Mode=OneWay}"
               Background="{Binding ElementName=lboxColour, Path=SelectedItem.Content, Mode=OneWay}"/>

</StackPanel>

Does anyone have any idea why this might be. I am pretty sure that I have the code as in the article and I have asked a few days ago at the address given in the article, but have had no reply.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
Why do programmers often confuse Halloween and Christmas? - Because 31 Oct = 25 Dec.
Business Myths of the Geek #4 'What you think matters.'

modified on Wednesday, June 30, 2010 6:51 PM

Re: Problem with Binding to XML in WPF.

Pete O'Hanlon30-Jun-10 10:44

Pete O'Hanlon

30-Jun-10 10:44

I'm not sure why your XML data island x:XData isn't working, but the second version has to be able to find the XML file in the same directory as the executable. Either set the properties on it to copy to the output directory, or give it the full path, i.e

.<StackPanel.Resources>
    <XmlDataProvider x:Key="MoreColours" XPath="/MyColours" Source="C:\Mef\WpfXmlSample\WpfXmlSample\Colours.xml" />
</StackPanel.Resources>

[Edit]Deliver a slap sideways to my head. The reason your XData isn't being picked up is because it's trying to resolve against a namespace (i.e. you need to supply a namespace to map against the XPath). To get round this, add xmlns="" to the x:XData declaration (i.e. <x:XData xmlns="">).

"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

Re: Problem with Binding to XML in WPF.

Henry Minute30-Jun-10 11:31

Henry Minute

30-Jun-10 11:31

Thanks Pete. The empty namespace tip worked for my first example.

As far as the second (XML File) example the file is set to 'copy if newer' and it is definitely in the same directory as the exe. Before I posted I had already tried with it set to Build action of 'None' and 'Resource', neither of which worked.

If you, or anyone else, have any other ideas, I'd be glad to hear them. Smile | :)

Re: Problem with Binding to XML in WPF.

Pete O'Hanlon30-Jun-10 11:45

Pete O'Hanlon

30-Jun-10 11:45

I ran your sample with the following code and it works with this:

<Window x:Class="WpfXmlSample.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
  <StackPanel>
    <StackPanel.Resources>
      <XmlDataProvider x:Key="MoreColours" XPath="/MyColours" Source="Colours.xml" />
    </StackPanel.Resources>
    <TextBlock Width="248" Height="24" Margin="0, 5, 0, 0" Text="Colours:" TextWrapping="Wrap"/>
    <ListBox x:Name="lboxMyColour" Width="248" Height="80" Margin="0,0,0,3"
         ItemsSource="{Binding Source={StaticResource MoreColours}, XPath=MyColour}">
      <ListBox.ItemTemplate>
        <DataTemplate>
          <StackPanel>
            <TextBlock Text="{Binding Mode=OneTime, XPath=@name}" />
          </StackPanel>
        </DataTemplate>
      </ListBox.ItemTemplate>
    </ListBox>

  </StackPanel>

</Window>

"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

Re: Problem with Binding to XML in WPF.

Henry Minute30-Jun-10 13:00

Henry Minute

30-Jun-10 13:00

Thanks for your help Pete!

Between that and a little experimentation I have managed to get it working.

Just in case you are interested, here's the code:

<Window x:Class="Binding_to_XML_File.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <StackPanel>
        <StackPanel.Resources>
            <XmlDataProvider x:Key="Colours" XPath="/colours" Source="Colours.xml" />
            <XmlDataProvider x:Key="MoreColours" XPath="/colours">
                <x:XData>
                    <colours xmlns="">
                        <colour name="pink" primary="true"/>
                        <colour name="white" primary="false"/>
                        <colour name="black" primary="true"/>
                        <colour name="cyan" primary="false"/>
                        <colour name="gray" primary="true"/>
                        <colour name="magenta" primary="false"/>
                    </colours>
                </x:XData>
            </XmlDataProvider>
        </StackPanel.Resources>
        <TextBlock Width="248" Height="24" Margin="0, 5, 0, 0" Text="Colours:" TextWrapping="Wrap"/>
        <ListBox x:Name="lboxColour" Width="248" Height="56" Margin="0,0,0,3" IsSynchronizedWithCurrentItem="True"
                 ItemsSource="{Binding Source={StaticResource Colours}, XPath=colour/@name}">
        </ListBox>
        <TextBlock Width="248" Height="24" Margin="0,5,0,0" Text="You selected colour:"/>
        <TextBlock Width="248" Height="24" Text="{Binding ElementName=lboxColour, Path=SelectedValue, Mode=OneWay}" 
                   Background="{Binding ElementName=lboxColour, Path=SelectedValue, Mode=OneWay}"/>
    </StackPanel>
</Window>

Now by changing ItemsSource="{Binding Source={StaticResource Colours}, XPath=colour/@name}" to ItemsSource="{Binding Source={StaticResource MoreColours}, XPath=colour/@name}" I can use the file or embedded XML

Re: Problem with Binding to XML in WPF.

Pete O'Hanlon30-Jun-10 21:47

Pete O'Hanlon

30-Jun-10 21:47

Job done. Of course, you could also have consulted my article here[^] which demonstrates how to do something like this (without the XData side).

"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

Re: Problem with Binding to XML in WPF.

Pete O'Hanlon1-Jul-10 11:58

Pete O'Hanlon

1-Jul-10 11:58

Hmmm. We seem to have attracted a univoter. Let me balance that out.

"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

Re: Problem with Binding to XML in WPF.

Henry Minute1-Jul-10 12:12

Henry Minute

1-Jul-10 12:12

It is being a busy little 'b' isn't it.

Re: Problem with Binding to XML in WPF.

Pete O'Hanlon1-Jul-10 12:13

Pete O'Hanlon

1-Jul-10 12:13

Chris has hunted down and delivered a beeyitch slapping.

"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

How to install silverlight

yogesh_kumar_agarwal29-Jun-10 19:39

yogesh_kumar_agarwal

29-Jun-10 19:39

Hi, All

i have VS2008 in my PC. Now i want to make a application in silverlight. I am unable to work with silverlight.

Acctually i have seen in the tutorials that we need to select silver light project from the new project window but i didn't find the same.

I have installed the silverlight by downloading it from silverlight.net but still but able to create the silverlight project.

I got a link for silverlight_Alpha for the same i install the same also, finally i got the silverlight template, but the problem remains the same when i tried to create a project i got a error "The project type is not supported by this installation"

So plz help me out. Plz tell me what to install for silverlight, from where i can download the same.

Thanks
Yogesh Agarwal

Re: How to install silverlight

Abhinav S29-Jun-10 20:13

Abhinav S

29-Jun-10 20:13

Since you are working with VS 2008, I'm assuming you must be installing Silverlight 3.

Just the SL runtimes are not enough for development.
You need the SDK + silverlight tooks (for VS 2008) which are included in the SL tools setup[^].
You will also need VS 2008 SP1.

Re: How to install silverlight

souidi abderrahman29-Jun-10 21:54

souidi abderrahman

29-Jun-10 21:54

you need to install Silverlight 3 SDK for vs 2008. not silverlight 4!!

Re: How to install silverlight

Abhinav S1-Jul-10 20:12

Abhinav S

1-Jul-10 20:12

souidi abderrahmen wrote:
you need to install Silverlight 3 SDK for vs 2008. not silverlight 4!!

Correct. Since the OP is using VS2008, he can only use SL2 or SL3 and not SL4. This requires VS 2010.

Re: How to install silverlight

souidi abderrahman1-Jul-10 20:53

souidi abderrahman

1-Jul-10 20:53

that is right Smile | :)

because i did the deploy on vs 2010, silverlight 4.

Re: How to install silverlight

Kunal Chowdhury «IN»30-Jun-10 1:03

Kunal Chowdhury «IN»

30-Jun-10 1:03

Hi Yogesh,

First of all, as you are using Visual Studio 2008 you can develop only Silverlight 3 applications using the IDE. Visual Studio 2008 doesn't support Silverlight 4. If you use Visual Studio 2010, you can develop both Silverlight 3 and Silverlight 4.

Assuming you want Silverlight 3 using Visual Studio 2008. For this, you need to install the Visual Studio 2008 SP1 (Service Pack 1). Once you upgraded to SP1, you need to download and install the Silverlight Tools for Visual Studio 2008 SP1.

Once installed properly, you will be able to create a new Silverlight project using your Visual Studio IDE.

Let me know, if you need more help.

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