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Thanks for this Pete, i'm just looking at this code now, I take it its ok to add this into the existing App.xaml.cs file rather than creating a completely new class.
Cheers,
Jammer
Going where everyone here has gone before! 
My Blog
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No. This should be a new class. WPF automatically generates an App entry, so you need to get round this by creating your own Application class - set the startup object to point to this in your project references.
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Works like an absolute charm!!! Thanks for this Pete!!
Jammer
Going where everyone here has gone before!
My Blog
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Yes the app class is the place to do the check.
Try putting code inside the App:OnStartup() function.
<br />
public partial class App : Application<br />
{<br />
protected override void OnStartup(StartupEventArgs e)<br />
{<br />
bool mutexCreated;<br />
mutexRunOnce = new System.Threading.Mutex(<br />
true, "{someGUID}", out mutexCreated);<br />
if (!mutexCreated)<br />
{<br />
return;<br />
}<br />
<br />
base.OnStartup(e);<br />
}<br />
}<br />
Sincerely,
-Ron
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Hello all,
For the past few days i've been trying to reproduce this sort of layout in wpf:
http://img170.imageshack.us/my.php?image=wp3hd5.png[^] But for the life of me I cant even get remotetly close to it. Basically the idea is to present a list of values as:
CountryName;CityName;Currency;Value;
C1;CITY1;E-U;0;
C1;CITY1;E-U;1;
C1;CITY1;U-E;0;
C1;CITY1;U-E;1;
C1;CITY1;U-E;3;
C1;CITY2;E-U;0;
C1;CITY2;E-U;1;
The organize them as shown in the screenshot grouped together by the first 3 columns. My first idea was to Create panels and nest sub controls into that (failed). Rendering grids within cells to get the items to grow accordingly to its children in code (failed). The last option will be to do it manually, as in redoing it with gdi as I have in the past, but wpf looks sooo nice it almost hurts not to try it.
I also took a look at some of Josh Smith's WPF tutorials on working with Treeviews and how to apply datatemplates on them, but hit another wall when trying to render the text vertically and fill the whole area covered by the children.
If someone has any ideas on how I can go about creating this sort of layout please let me know.
Thanks in advance.
/Rei
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I'm not sure if you looked at this article or not, but I was able to get pretty close to your layout just by changing the grid from rows to columns and turning the StackPanel back to vertical orientation.
As far as rendering vertically, I would start by applying a layout transform of 90 or 270 degrees to the ContentPresenter. When you say fill the whole area, do you mean stretching the text to fill the whole area, or just stretch the background to fill the area? If you mean the latter, I would look for margins and paddings that may be causing the space between items.
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I missed that article, you my friend just hit the nail right on the head!!! Thank you very much. And Josh, you're the man!
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R A Roldan wrote: Josh, you're the man
Yep. May I recommend you read all of his WPF articles with time permitting  Plenty of good to learn from him.
"The clue train passed his station without stopping." - John Simmons / outlaw programmer
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
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Good people,
I have a window that is laid out using a grid. The main part of the user interaction will take place in column 1, row 0. In order for the user to submit or get information, I basically have to load and remove items (e.g. a flowdocumentviewer, another grid containing a border, list box, and other child elements, etc...) into column 1, row 0 of the grid. The loading and unloading will be, of course, menu driven by the user.
My question is, how do I load those elements into the grid at the desired location, then discard them when I am finished? Also how do I make sure that they're not using up memory but have been deleted or discarded? If they are not in view; I don't need them.
I will need to do this programmatically in C#.
A final tangential question; how would you recommend I create these elements? I am using MS Expression Blend and normally I would create something in column1, row 0. However, since I need to create multiple elements to fully occupy that space, I am wondering if I should do it as a control?
Any thoughts you have would be greatly appreciated.
Thanks in advance.
BP
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Definitely do it as a ContentControl - it will save you so much time in the long run. Secondly, you can set the position of something in your code using Grid.SetRow and Grid.SetColumn in a UIElement.
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Thanks. How do I create and delete it?
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Off the top of my head (so I apologise now if it's not 100% accurate as I haven't got Visual Studio open right now):
using (StreamReader reader = new StreamReader("myControl.xaml"))
{
DependencyObject root = XamlReader.Load(reader.BaseStream) as DependencyObject;
if (root != null)
{
ContentControl cont = FindName("display") as ContentControl;
cont.Content = root;
}
}If you create the display page as a Frame, then you can load into this without any trouble. For instance:
<Window... usual Xaml declarations ..>
<Grid x:Name="myGrid">
<Grid.RowDefinitions>
<RowDefinition />
</Grid.RowDefinitions>
<Grid.ColDefinitions>
<ColDefinition />
<ColDefinition />
</Grid.ColDefinitions>
<Frame Grid.Row="0" Grid.Column="1" x:Name="display" />
</Grid>
</Window>
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Thanks. I appreciate your help.
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Hi,
I have created login and registration silverlight application using blend June Preview 2008. I would like to ask how to I link this two application in asp.net using visual studio 2008.
For example, I create an asp.net website and I would like to add the login and registration silverlight apllication in this website.When I click on the navigation link which created using asp.net such as login button, then the page will show the login silverlight application and it same to the registration as well.
Hence, how can I do for that??
Thanks.
Regards.
Katelva
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Hello Katelva,
Actually, you can have login and registration in single Silverlight application. You can use them as the controls in Silverlight.
What you should do is that.
1) Go to VS 2008.
2) Create Silverlight Application with Web project (not with the generated Html)
3) Add one Silverlight control and name it as "LoginControl"
4) Add another Silverlight control and name it as "RegistrationControl"
5) Right-click on one of those XAML files and select "Open in Expression Blend" (then, you can customize the XAML as you like in Blend and save it and close the blend. )
6) Create the navigation in Page.xaml.
7) Run the application. (ASP.NET and Silverlight will be linked automatically and Silverlight control will be shown on aspx page. )
Hope it helps.
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Hi Michael,
It means created the silverlight application which hosts in asp.net,am I right?
Actually, I would like to do is create Asp.net website(navigation), then when I click on the link it will appear the Login form in the asp.net webform which mean the design is using css and asp.net but the content such as registration form, login form...etc is using silverlight.
Can I do this way?
Thanks.
Regards,
Katelva
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katelva wrote: It means created the silverlight application which hosts in asp.net,am I right?
Yes.
katelva wrote: Actually, I would like to do is create Asp.net website(navigation), then when I click on the link it will appear the Login form in the asp.net webform which mean the design is using css and asp.net but the content such as registration form, login form...etc is using silverlight.
In my opinion, you should consider two things. Do you want to use Silverlight partially with ASP.NET or do you want to create full Silverlight application (e.g. Hard Rock Cafe, etc)?
I will use Silverlight partially if I want to host Silverlight Game, Video/Audio Players, Silverlight Advertisements.
I will use Full Silverlight Application if I want to develop RIA application.
In your case, I would like to suggest you full-silverlight application instead of using silverlight partially.
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Thanks for your suggestion.
But I would like to know whether there was any difficulty connecting the data with the MySQL database or not? Actually, I am creating a store website and the client can order the products online. Because Silverlight is new Microsoft product,hence, I am not sure whether have any issue with the database connection or not?
Regards,
Katelva
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Hi Katelva,
Silverlight is a client-side technology which runs on the user's browser. so, you can't connect with any database directly from Silverlight. but you can create the service (i.e: ASMX webservice, WCF, ADO.NET Data Service, Java or Webservice that follows WS Basic-Profile 1.1 ) and you can connect with that web service.
there are a few samples how to do CRUD (Create, Retrieve, Update, Delete) operation in Silverlight in my blog. you may want to read them.
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Hi,
I'm relatively new to WPF and am still trying to get my head around certain aspects so if this is a stupid question please accept my apologies in advance.
I have a listbox that is bound to a list of custom objects.
Based on the value of a property in each object I want the listbox item to be displayed differently
The data binding is working fine and the item template that I am using works fine, my problem is in changing the item template based on a property value.
Trivial example:
Assume I have a class Person with two properties : Male and Female
If Male == true I want the listbox item to be rendered as a grid with three rows and 2 columns
If Female == true I want the listbox to be rendered as a grid with a single row
Is this possible?
Thanks very much,
dlarkin77
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We do something like this by having a base listboxitem class, then having derived classes which have styles, and which we use to add items. We mix styles within the listbox tho, sounds like you want to have one or the other. I am asking something similar below, and a Property Trigger is what was suggested for me.
Christian Graus
Please read this if you don't understand the answer I've given you
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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I would start by looking at using triggers in the style of the data template given to the ItemTemplate property. On a hunch, the style will probably not do quite what you need since it sounds more like you are using two different data templates. In that case, I would look at the ItemTemplateSelector property, which takes a DataTemplateSelector (documentation on MSDN).
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Thanks for the advice. I'll look into both of those.
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Hi,
Using a DataTemplateSelector solved my problem.
Thanks very much,
dlarkin77
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