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• Scrollable Wrappanel in Silverlight

  - by Matt

  How do I make a Wrappanel scrollable? Here's the XAML that I've been using but I get errors with it. <ItemsControl x:Name="lbMedia"> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <ScrollViewer HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Auto"> <c:WrapPanel></c:WrapPanel> </ScrollViewer> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> <ItemsControl.ItemTemplate> <DataTemplate> <im:MediaManagerItem></im:MediaManagerItem> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl>

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• Winform custom control in WPF

  - by Erika

  Hi, I'm inserting a custom winform control in a WPF/ XAML window, however i'm realising that the sizing seems to be very different, what i designed in winform to be 730pixels wide for instance, when placed via a WindowsFormsHost, in a container 730pixels (or at least i think they're pixels..) wide, the control looks much larger and doesnt fit in the host and results in clipping from the right and bottom. Would anyone know how to make these sizes match or something? I'm really at a loss and its very difficult to fix a custom control to make it look as it should off hand on WPF! Please help!

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• HTTP Error 500.19 - Internal Server Error for silverlight application

  - by KentZhou

  Use VS2010 silverlight business application template to createa defaut solution. Change authentication to Windows in Web.config and the code in app.xaml.cs to use windows authentication. Nothing else changed. Then run this app from vs2010 built-in web server, it is fine, I can see the login user info from windws(from a AD domain account) display on the top-right of the screen, like DomainName\userName. Then deploy this web app to IIS on windows 7(same computer) and access this app again, I got following error: HTTP Error 500.19 - Internal Server Error The requested page cannot be accessed because the related configuration data for the page is invalid. Detailed Error InformationModule IIS Web Core Notification Unknown Handler Not yet determined Error Code 0x80070005 Config Error Cannot read configuration file due to insufficient permissions Config File \\?\C:\Users\myname\Documents\Visual Studio 2010\Projects\BusinessApplication4\BusinessApplication4.Web\web.config Requested URL http://localhost:77/BusinessApplication4TestPage.html Physical Path Logon Method Not yet determined Logon User Not yet determined Config Source -1: 0: how to resolve this problem?

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• WPF - Binding problem

  - by Erez

  Why after clicking the button the text in the textblock doesn't change ? XAML: <Grid> <Grid.RowDefinitions> <RowDefinition/> <RowDefinition/> </Grid.RowDefinitions> <TextBlock Text="{Binding Name}"/> <Button Click="Button_Click" Grid.Row="1" Margin="20">Click Me</Button> </Grid> Code behind: public partial class Window1 : Window, INotifyPropertyChanged { private Person _myPerson; public Person MyPerson { get { return _myPerson; } set { _myPerson = value; if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs("MyPerson")); } } } public Window1() { MyPerson = new Person { Name = "A" }; DataContext = MyPerson; InitializeComponent(); } private void Button_Click(object sender, RoutedEventArgs e) { MyPerson = new Person { Name = "B" }; } #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; #endregion }

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• WF4 - Display workflow design in asp.net and highlight an activity

  - by jikan_the_useless

  i need to display current status of a document approval workflow task in asp.net web page with a specific activity highlighted. i have seen the visual workflow tracker example (in wf&wcf samples) but i have two issues, 1-i have to render workflow in asp.net not in a wpf app. 2-i don't need to display current status with workflow running, all activities that need to highlighted are the one that require user input. e.g. "waiting for approval from department head" etc. if i could just convert the workflow xaml to jpg after highlighting a specific activity by activity id that created a bookmark and waiting to resume the bookmark it would do the work.

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• Problem with WPF perfomance.

  - by Polaris

  I have form which has many tabs. Every tab has many controls textboxes, comboboxes, datagrids and e .t.c. I bind form to one data source in such way this.DataContext=MyClassInstance But with this way my form opening very slow. about one minute. When I comment above code, form opens very quickly. All My controls I bound to the class properties in XAML. Please tell me the way to bind every tab when it's activated, or bind controls in background thread or any other idea which can help me to speed up my form. Thanks in advance.

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• WPF listbox : problem with selection

  - by KiTe

  Hello. In my XAML file, I have a ListBox declared like this : <ListBox x:Name="lstDeck" Height="280" ItemsSource="{Binding Path=Deck}" > <ListBox.ItemTemplate> <DataTemplate> <ListBoxItem Content="{Binding}" /> </DataTemplate> </ListBox.ItemTemplate> </ListBox> In my view model, Deck is an ObservableCollection, so that binding directly displays the content of my collection. But when I have several value that hold the same value (for example "10" six times), the selection in the ListBox has a weird behaviour : it select 2-3 elements instead of the only the one on which I clicked. Moreover, when I click to another listBoxItem, it doesn't unfocus the previous selected one. Then it is impossible to see which item is actually selected, and impossible to get the SelectedIndex value. Has someone an idea?

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• LicenseException for Xceed DataGrid for WPF

  - by ewall

  I have developed a simple DB-editing app using Xceed's excellent DataGrid for WPF (UX Edition version 3.7), which is now ready for deployment... except that when I run it on a machine other than the development one where it was built, I am getting the runtime exception for invalid licensing. I have included my license key in the App.xaml.cs exactly as specified in the Xceed docs, like so: public partial class App : System.Windows.Application { protected override void OnStartup(StartupEventArgs e) { Xceed.Wpf.DataGrid.Licenser.LicenseKey = "DGF37-xxxxx-xxxxx-xxxx"; base.OnStartup(e); } } The correct version of the DataGrid DLLs are being included in the setup and the application's program directory, and there are no other versions on the target machine. Debugging doesn't show me anything useful other than the LicenseException that is thrown when the code tries to use the DataGrid, with the message that reads "Xceed.Wpf.DataGrid.Licenser.LicenseKey property must be set to a valid license key in the code of your application before using this product..." Any idea what's going wrong here?

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• Scale a Visual Brush Background WPF

  - by user279244

  Hello, I have a Item called MiniMap in my xaml. I have set the background of it to a visual brush representting a canvas Item. Now, I want to scale the background to a ratio 0.7 . How can I do it? Thanks in advance <local:MiniMap Width="201" Height="134" x:Name="MiniMapItem" MinHeight="100" MinWidth="100" Opacity="1" SnapsToDevicePixels="True" Margin="0,0,20,20" VerticalAlignment="Bottom" HorizontalAlignment="Right"> <local:MiniMap.Background> <VisualBrush Visual="{Binding ElementName=viewport}" Stretch="None" TileMode="None" AlignmentX="Left" AlignmentY="Top" /> </local:MiniMap.Background> </local:MiniMap>

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• Increase columns width in Silverlight DataGrid to fill whole DG width

  - by Henrik P. Hessel

  Hello, I have a DataGrid Control which is bound to a SQL Table. The XAML Code is: <data:DataGrid x:Name="dg_sql_data" Grid.Row="1" Visibility="Collapsed" Height="auto" Margin="0,5,5,5" AutoGenerateColumns="false" AlternatingRowBackground="Aqua" Opacity="80" > <data:DataGrid.Columns> <data:DataGridTextColumn Header="Latitude" Binding="{Binding lat}" /> <data:DataGridTextColumn Header="Longitude" Binding="{Binding long}" /> <data:DataGridTextColumn Header="Time" Binding="{Binding time}" /> </data:DataGrid.Columns> </data:DataGrid> Is it possible increase the single columns sizes to fill out the complete width of the datagrid? thx!, rAyt Edit: Columns with "*" as width are coming with the Silverlight SDK 4.

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• Silverlight MVVM conversion from WPF

  - by IrishJoker

  I was reading this article - http://msdn.microsoft.com/en-us/magazine/dd419663.aspx And I came across this piece of code in the WPF Demo application that came with the article. This template applies a CustomerView to an instance of the CustomerViewModel class shown in the main window. <DataTemplate DataType="{x:Type vm:CustomerViewModel}"> <vw:CustomerView /> </DataTemplate> I substituted the angle brackets for square brackets - not sure how to post them. The code is in the MainWindowResourses.xaml and the code starts on line 19. Anyone know how I can do this in Silverlight ?? We don't have the DataType and I need to be able to tell the app that this View is associated with this ViewModel - so I can create a tab control with different view like the demo app. Cheers, EC

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• WPF: HierarchicalDataTemplate ItemsPanel

  - by Echilon

  I have a TreeView which uses a custom ItemsPanel to show the first level of items in a StackPanel, but I need to show subitems in a StackPanel too. The problem is, the second level of items are shown in a WrapPanel, and as HierarchicalDataTemplate doesn't have an itemsPanel property I'm not sure how to do this. This is my xaml: <TreeView x:Name="treGlobalCards"> <TreeView.ItemsPanel> <ItemsPanelTemplate> <StackPanel IsItemsHost="True" Orientation="{Binding Orientation,RelativeSource={x:Static RelativeSource.TemplatedParent}}" MaxWidth="{Binding ActualWidth,RelativeSource={RelativeSource AncestorType={x:Type ScrollContentPresenter}}}"/> </ItemsPanelTemplate> </TreeView.ItemsPanel> <TreeView.ItemTemplate> <HierarchicalDataTemplate x:Key="CardTypeTemplate" ItemsSource="{Binding Cards}"> <TextBlock Text="{Binding Path=CardType}"/> </HierarchicalDataTemplate> </TreeView.ItemTemplate> </TreeView>

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• How can I dynamically set the event handler for a TabItem when it is selected?

  - by juharr

  In XAML you can do <TabItem Selector.Selected="myEvenHandler"></TabItem> to set the event handler for when that tab is selected. How can I do the exact same thing dynamically. I would prefer not to use the SelectionChanged event of TabControl if I can help it. Clearly there is a Selected event on the TabItem I just cannot seem to get at it in code. Here's what I'd like to do. TabItem item = new TabItem(); MyCustomControl mcc = new MyCustomControl(); item.Content = mcc; item.Selected += (s,e) => // This event does not exist { selectedControl = mcc; } myTabControl.Items.Add(item);

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• Host new WF4 workflows in appfabric

  - by racingcow

  Hello, I am new to using AppFabric to host WF services. I am trying to write a workflow admin application that will allow users to create xaml workflow definitions using the hosted WF4 designer, and then somehow allow those workflow defitions to be automatically deployed and hosted in AppFabric with the click of a button. I have the designer going, and I have read a couple of tutorials on how to host workflow services in AppFabric such as http://msdn.microsoft.com/en-us/library/ee677238.aspx, but my problem is how to deploy and host the workflow services via code. Does anyone know if this sort of "autodeploy/host" thing can be done with AppFabric? If so, could you point me in the right direction on this? -David

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• Assign binding path at runtime in WPF DataTemplate

  - by Abiel

  I am writing a WPF program in C# in which I have a ListView for which the columns will be populated at runtime. I would like to use a custom DataTemplate for the GridViewColumn objects in the ListView. In the examples I have seen where the number of columns is fixed in advance, a custom DataTemplate is often created using something like the XAML below. <DataTemplate x:Key="someKey"> <TextBlock Text="{Binding Path=FirstName}" /> </DataTemplate> This DataTemplate could also later be assigned to GridViewColumn.CellTemplate in the code-behind by calling FindResource("someKey"). However, this alone is of no use to me, because in this example the Path element is fixed to FirstName. Really I need something where I can set the Path in code. It is my impression that something along these lines may be possible if XamlReader is used, but I'm not sure how in practice I would do this. Any solutions are greatly appreciated.

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• How add a ItemsPanel dynamically to listbox.

  - by Subhen

  Hi, I have a list Box which contains few Images in the itemsTemplate , like below: <ListBox.ItemTemplate> <DataTemplate> <StackPanel x:Name="stackPanelItems" Orientation="Horizontal"> <Image Source="{Binding strAlbumcoverImage}" Height="40" Width="40"/> </StackPanel> </DataTemplate> </ListBox.ItemTemplate> Now onClick of a button I want to change the view and for that I want to add the wrap panel to the ListBox ItemsPanelas following: <ListBox.ItemsPanel> <ItemsPanelTemplate> <controlsToolkit:WrapPanel></controlsToolkit:WrapPanel> </ItemsPanelTemplate> </ListBox.ItemsPanel> Do I need to define the ItemsPanel Style in App.XAML and then assign it. Not quite sure about it. Thanks, Subhen

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• How do you draw a line on a canvas in WPF that is 1 pixel thick.

  - by xarzu

  The method for drawing a line on a canvas in WPF that uses the line class actually draws a line that is two pixels thick: Line myLine = new Line(); myLine.Stroke = System.Windows.Media.Brushes.Black; myLine.X1 = 100; myLine.X2 = 140; // 150 too far myLine.Y1 = 200; myLine.Y2 = 200; myLine.StrokeThickness = 1; graphSurface.Children.Add(myLine); Microsoft might have decided to set a standard for line thickness and the minimum is 2 pixels thick when you set the strockThickness to 1, but when you already have rectangles drawn in XAML and even error fonts using WingDings, it is an obvious miss-match. How do you draw a line that is truly 1 pixel thick?

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• WPF: Setting toolbar button sizes using a Style

  - by Allen Ho

  I have buttons on a toolbar in WPF. When I do the XAML: <ToolBar.Resources> <Style TargetType="{x:Type Button}"> <Setter Property="Width" Value="21"></Setter> <Setter Property="Height" Value="21"></Setter> </Style> </ToolBar.Resources> None of the buttons on the toolbar set their sizes accordingly. I have to go to each button and manually set their widths and heights to the desired values. Any idea why the Style on the toolbar does not work?

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• Can a ScatterViewItem dynamically resize to fit its content?

  - by Brett

  We're hosting a control inside of a ScatterViewItem that dynamically changes its size at runtime as a result of having various sub-elements added, removed, and/or collapsed. We would like to have the hosting ScatterViewItem resize as well to properly fit its child controls, but we're having a hard time making this happen. We've tried a number of different things and the closest we've come is hooking into the child control's SizeChanged event and explicitly setting the ScatterViewItem's Width and Height, but this approach still has issues. When you define a ScatterViewItem and its content in XAML, the ScatterViewItem is sized appropriately. We would like to force the same behavior at runtime when its content changes size. Any help would be greatly appreciated. Thanks!

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• How can I access the ListViewItems of a WPF ListView?

  - by David Schmitt

  Within an event, I'd like to put the focus on a specific TextBox within the ListViewItem's template. The XAML looks like this: <ListView x:Name="myList" ItemsSource="{Binding SomeList}"> <ListView.View> <GridView> <GridViewColumn> <GridViewColumn.CellTemplate> <DataTemplate> <!-- Focus this! --> <TextBox x:Name="myBox"/> I've tried the following in the code behind: (myList.FindName("myBox") as TextBox).Focus(); but I seem to have misunderstood the FindName() docs, because it returns null. Also the ListView.Items doesn't help, because that (of course) contains my bound business objects and no ListViewItems. Neither does myList.ItemContainerGenerator.ContainerFromItem(item), which also returns null.

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• capture MouseEnter / MouseLeave on Image in WPF TreeViewItem

  - by pileggi

  Hi! I've done my TreeView all with XAML but now I'd like to manage an event with code-behind and I don't know how. The HierarchicalDataTemplate contains an Image. I need to capture the events MouseEnter / MouseLeave on the Image. I've tried in this way: <Image x:Name="imgArticolo" Source="{Binding imgArt}"> <Image.Style TargetType="{x:Type Image}"> <Style> <EventSetter Event="MouseEnter" Handler="iArt_MouseEnter"/> </Style> </Image.Style> </Image> But it doesn't work: error: "MouseEnter member not recognized or not accessible" (from italian) Can you, please, help me? Thank you! Pileggi

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• Null Reference Exception on MVVM pattern

  - by Mohit Deshpande

  System.NullReferenceException Object reference not set to an instance of an object. at Microsoft.Windows.Design.DocumentModel.Trees.MarkupDocumentTreeManager.<FindMarkupNodePath>d__0.MoveNext() at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable1 source) at MS.Internal.Services.DocumentInformationServiceImpl.get_Root() at MS.Internal.Designer.VSDesigner.Load() at MS.Internal.Designer.VSIsolatedDesigner.VSIsolatedView.Load() at MS.Internal.Designer.VSIsolatedDesigner.VSIsolatedDesignerFactory.Load(IsolatedView view) at MS.Internal.Host.Isolation.IsolatedDesigner.BootstrapProxy.LoadDesigner(IsolatedDesignerFactory factory, IsolatedView view) at MS.Internal.Host.Isolation.IsolatedDesigner.BootstrapProxy.LoadDesigner(IsolatedDesignerFactory factory, IsolatedView view) at MS.Internal.Host.Isolation.IsolatedDesigner.Load() at MS.Internal.Designer.DesignerPane.LoadDesignerView() I keep getting this exception and then intellisense stops working in a XAML text editor. Any ideas why?

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• DataTemplate in ListBox

  - by Anu

  Hi, I have tabcontrol,in that by pressing second tab button im adding data to third Tab Listbox.But its not get added. SecondTab function: private void Callbutton_Click(object sender, RoutedEventArgs e) { tab.AddPresetmenu("CALL BUTTON"); } ThirdTab Fucntion: ObservableCollection<DataItem> items = new ObservableCollection<DataItem>(); public void AddPresetmenu(string pMenu) { items.Add(new DataItem(pMenu)); menubox.ItemsSource = items; } Third Tab ListBox XAML: <ListBox x:Name="menubox" Margin="0,5,0,0" Height="244" Width="240" Background="Silver" BorderThickness="0"> </ListBox> I think Im missing something.Please Help me.

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• WPF Validation & IDataErrorInfo

  - by Jefim

  A note - the classes I have are EntityObject classes! I have the following class: public class Foo { public Bar Bar { get; set; } } public class Bar : IDataErrorInfo { public string Name { get; set; } #region IDataErrorInfo Members string IDataErrorInfo.Error { get { return null; } } string IDataErrorInfo.this[string columnName] { get { if (columnName == "Name") { return "Hello error!"; } Console.WriteLine("Validate: " + columnName); return null; } } #endregion } XAML goes as follows: <StackPanel Orientation="Horizontal" DataContext="{Binding Foo.Bar}"> <TextBox Text="{Binding Path=Name, ValidatesOnDataErrors=true}"/> </StackPanel> I put a breakpoint and a Console.Writeline on the validation there - I get no breaks. The validation is not executed. Can anybody just press me against the place where my error lies?

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• How2 display Image from DB in datagrid?

  - by Saverio Tedeschi

  Hope it's not yet been answered, but I've googled for quite a long time, and I've not been able to get it working. In brief, I've a SL4 page with a DataGrid filled accordingly to parameters passed from the previous page, so I fill the context in code, with a "RIA" query (w/parameters as well). So far, so good. I get the XAML declared columns as expected but the Photo templated column, which holds just an image control. I think I can use the LoadingRow event, but can some1 give me some code on how to get my goal (image is in in the context from DB)? Thanks in advance

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