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• What is the best way to slide a panel in WPF?

  - by Kris Erickson

  I have a fairly simple UserControl that I have made (pardon my Xaml I am just learning WPF) and I want to slide the off the screen. To do so I am animating a translate transform (I also tried making the Panel the child of a canvas and animating the X position with the same results), but the panel moves very jerkily, even on a fairly fast new computer. What is the best way to slide in and out (preferably with KeySplines so that it moves with inertia) without getting the jerkyness. I only have 8 buttons on the panel, so I didn't think it would be too much of a problem. Here is the Xaml I am using, it runs fine in Kaxaml, but it is very jerky and slow (as well as being jerkly and slow when run compiled in a WPF app). <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="1002" Height="578"> <UserControl.Resources> <Style TargetType="Button"> <Setter Property="Control.Padding" Value="4"/> <Setter Property="Control.Margin" Value="10"/> <Setter Property="Control.Template"> <Setter.Value> <ControlTemplate TargetType="Button"> <Grid Name="backgroundGrid" Width="210" Height="210" Background="#00FFFFFF"> <Grid.BitmapEffect> <BitmapEffectGroup> <DropShadowBitmapEffect x:Name="buttonDropShadow" ShadowDepth="2"/> <OuterGlowBitmapEffect x:Name="buttonGlow" GlowColor="#A0FEDF00" GlowSize="0"/> </BitmapEffectGroup> </Grid.BitmapEffect> <Border x:Name="background" Margin="1,1,1,1" CornerRadius="15"> <Border.Background> <LinearGradientBrush StartPoint="0,0" EndPoint="0,1"> <LinearGradientBrush.GradientStops> <GradientStop Offset="0" Color="#FF0062B6"/> <GradientStop Offset="1" Color="#FF0089FE"/> </LinearGradientBrush.GradientStops> </LinearGradientBrush> </Border.Background> </Border> <Border Margin="1,1,1,0" BorderBrush="#FF000000" BorderThickness="1.5" CornerRadius="15"/> <ContentPresenter HorizontalAlignment="Center" Margin="{TemplateBinding Control.Padding}" VerticalAlignment="Center" Content="{TemplateBinding ContentControl.Content}" ContentTemplate="{TemplateBinding ContentControl.ContentTemplate}"/> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> </UserControl.Resources> <Canvas> <Grid x:Name="Panel1" Height="578" Canvas.Left="0" Canvas.Top="0"> <Grid.RenderTransform> <TransformGroup> <TranslateTransform x:Name="panelTranslate" X="0" Y="0"/> </TransformGroup> </Grid.RenderTransform> <Grid.RowDefinitions> <RowDefinition Height="287"/> <RowDefinition Height="287"/> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition x:Name="Panel1Col1"/> <ColumnDefinition x:Name="Panel1Col2"/> <ColumnDefinition x:Name="Panel1Col3"/> <ColumnDefinition x:Name="Panel1Col4"/> <!-- Set width to 0 to hide a column--> </Grid.ColumnDefinitions> <Button x:Name="Panel1Product1" Grid.Column="0" Grid.Row="0" HorizontalAlignment="Center" VerticalAlignment="Center"> <Button.Triggers> <EventTrigger RoutedEvent="Button.Click" SourceName="Panel1Product1"> <EventTrigger.Actions> <BeginStoryboard> <Storyboard> <DoubleAnimation BeginTime="00:00:00.6" Duration="0:0:3" From="0" Storyboard.TargetName="panelTranslate" Storyboard.TargetProperty="X" To="-1000"/> </Storyboard> </BeginStoryboard> </EventTrigger.Actions> </EventTrigger> </Button.Triggers> </Button> <Button x:Name="Panel1Product2" Grid.Column="0" Grid.Row="1" HorizontalAlignment="Center" VerticalAlignment="Center"/> <Button x:Name="Panel1Product3" Grid.Column="1" Grid.Row="0" HorizontalAlignment="Center" VerticalAlignment="Center"/> <Button x:Name="Panel1Product4" Grid.Column="1" Grid.Row="1" HorizontalAlignment="Center" VerticalAlignment="Center"/> <Button x:Name="Panel1Product5" Grid.Column="2" Grid.Row="0" HorizontalAlignment="Center" VerticalAlignment="Center"/> <Button x:Name="Panel1Product6" Grid.Column="2" Grid.Row="1" HorizontalAlignment="Center" VerticalAlignment="Center"/> <Button x:Name="Panel1Product7" Grid.Column="3" Grid.Row="0" HorizontalAlignment="Center" VerticalAlignment="Center"/> <Button x:Name="Panel1Product8" Grid.Column="3" Grid.Row="1" HorizontalAlignment="Center" VerticalAlignment="Center"/> </Grid> </Canvas> </UserControl>

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• How to implement paging for datagrid using LINQ to Entities in wpf?

  - by Levelbit

  I'm new in wpf. My main problem is to understand how DataGrid works with its datacontext. It would help me a lot because I don't know how to make a universal paging usercontrol for all my datagrids in the projects for different database tables. DataGrid converts received DataContext from object to some kind of list. How it is implemented. I tried to do some casting from object to IQueryable to generalize thinig because base class of every entity in the entity model is EntityObject class. But it doesen't work in runtime although I don't receive complains at design time.

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• Is there a WPF "WrapGrid" control available or an easy way to create one?

  - by Jason Coyne

  Essentially I want a wrapPanel, but I would like items to snap to a grid rather than be pressed up to the left, so I can get a nice uniform looking grid, that automatically consumes available space. WrapPanel handles the resize part. WPF.Contrib.AutoGrid handles a nice automatic grid. Anyone got a control that combines them? My use case is I have a series of somewhat irregularly shaped controls. I would like them to appear in nice columns so the wrap panel should snap to the next "tabstop" when placing a control

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• WPF MVVM: how to bind GridViewColumn to ViewModel-Collection?

  - by Sam

  In my View I got a ListView bound to a CollectionView in my ViewModel, for example like this: <ListView ItemsSource="{Binding MyCollection}" IsSynchronizedWithCurrentItem="true"> <ListView.View> <GridView> <GridViewColumn Header="Title" DisplayMemberBinding="{Binding Path=Title}"/> <GridViewColumn Header="Name" DisplayMemberBinding="{Binding Path=Name}"/> <GridViewColumn Header="Phone" DisplayMemberBinding="{Binding Path=Phone}"/> <GridViewColumn Header="E-mail" DisplayMemberBinding="{Binding Path=EMail}"/> </GridView> </ListView.View> </ListView> Right now these GridViewColumns are fixed, but I'd like to be able to change them from the ViewModel. I'd guess I'll have to bind the GridViewColumn-collection to something in the ViewModel, but what, and how? The ViewModel does know nothing of WPF, so I got no clue how to achieve this in MVVM. any help here?

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• How to generate and print large XPS documents in WPF?

  - by bitbonk

  I would like to generate (and then print or save) big XPS documents (400 pages) from my WPF application. We have some large amount of in-memory data that needs to be written to XPS. How can this be done without getting an OutOfMemoryException? Is there a way I can write the document in chunks? How is this usually done? Should I not be using XPS for large files in the first place? The root cause of the OutOfMemoryException seems to be the creation of the huge FlowDocument. I am creating the full FlowDocument and then sending it to the XPS document writer. Is this the wrong approach?

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• Wpf datagrid row not updating when binded collection updated?

  - by RAJ K

  I have product class class Products { public int ProductID { get; set; } public int Quantity { get; set; } public string Description { get; set; } public decimal Price { get; set; } public decimal SubTotal { get; set; } } public List<Products> ProductsList = new List<Products>(); I have binded this "ProductList" to wpf datagrid. This datagrid shows item already in collection (before DataGrid.DataContext applied) but not showing new item added. I am using List< instead of ObservableCollection< because I want to update items if user changes quantity. I don't know how to do that using ObservableCollection<. Some code will help thanks

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• How to get a tool window title bar height in WPF ?

  - by user275587

  WPF includes the title bar height in the total window height instead of using only the client content area height. Is there a way to disable this behaviour? If not, how can I get the height of a tool window title bar? I'm aware of the SystemParameters.CaptionHeight property and the SystemParameters.WindowCaptionHeight property but they both return the height of a regular window title bar. This is not the correct value for a tool window because the title bar is smaller for this type of window. I need something like SystemParameters.ToolWindowCaptionHeight Thanks.

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• WPF assign Z-Order of owned windows without changing focus.

  - by Kamiikoneko

  Hi, Due to OpenGL airspace issues I have several windows that are owned by the main window but look and act like controls. I also have some data readout/sort windows that show real-time data and need to be normal floating windows, also owned by the main window so that they remain floating above the main window even while operations are performed in the main window. The issue: I open a data readout window (normal window) and am watching data change. Then I click on a text box to enter a value in one of the windows that acts as a control due to airspace issues, and it becomes activated, covering up my data readout window. This is bad because the airspace window is supposed to act like it is part of the main window. I tried some tricks with Activation and Deactivation, and it looks ok but then editing the airspace window at all is impossible because WPF only lets me edit the activated window. How can I ask that normal data readout window to please stay above all other windows owned by the main window, but still let other windows receive focus?

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• How to bind Checked event for radio button in WPF?

  - by nullDev

  I am using the following markup in WPF: <StackPanel.Triggers> <EventTrigger RoutedEvent="RadioButton.Checked" SourceName="xmlRadioButton"> <EventTrigger.Actions> <BeginStoryboard Storyboard="{StaticResource ShowXmlPanel}"/> </EventTrigger.Actions> </EventTrigger> <EventTrigger RoutedEvent="RadioButton.Checked" SourceName="adiRadioButton"> <EventTrigger.Actions> <BeginStoryboard Storyboard="{StaticResource ShowAdiPanel}"/> </EventTrigger.Actions> </EventTrigger> </StackPanel.Triggers> Though this works fine when I run the code, I get the following error in the designer window of VS 2008: Value 'RadioButton.Checked' cannot be assigned to property 'RoutedEvent'. Invalid event name. Any idea why, and how can I fix this?

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• iPhone like red badge notification in a WPF project?

  - by Norbert

  I have a C# WPF project which generates daily and weekly reports automatically. I want to inform the user when new reports are available, so I thought of a badge like on the iPhone where the number of new messages appears on a little red circle: I thought of three images: Two images with semi circles on the left and right if the number to display is small. And a third image for the middle for the case that the number is large (123) and wouldn't fit in a circle. I want a glossy effect, so I've thought of pictures. Does anyone have a good idea how to do this without pictures but programmatically?

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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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• How to set a .PNG image as a TILED background image for my WPF Form?

  - by John McClane

  I'm learning WPF on my own and I can't seem to find a way to make this work. Here's my code: <Window x:Class="Test.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Test" Height="600" Width="800" > <DockPanel> <Menu DockPanel.Dock="Right" Height="30" VerticalAlignment="Top" Background="#2E404B" BorderThickness="2.6"> <Menu.BitmapEffect> <DropShadowBitmapEffect Direction="270" ShadowDepth="3" Color="#2B3841"/> </Menu.BitmapEffect> </Menu> </DockPanel> How can I make a .BackgroundImage thing appear? :D

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• In WPF RichTextBox, does overriding of Underline/Strikethrough work?

  - by Daniel Earwicker

  In a WPF RichTextBox, the effective style of a Run of text is a result of combining the properties defined on the Run with the properties it "inherits" from the enclosing Paragraph and finally the styles on the Document. So you can set FontWeight to Bold at any of those levels. You can also set it Bold on the Paragraph and then switch it to Normal (override it) for a specific Run. However, underline and strikethrough are different. They are items that can optionally appear in a list of TextDecorations, which is a property of Inline (and hence Run) and of Paragraph, but not of Document. And you can switch on Underline in the Paragraph, and it gets inherited so that all Runs within that Paragraph default appear underlined by default. Is it possible to switch it off underline in a specific Run? i.e. is there a way to insert an entry into the list of TextDecorations which would mean "Don't underline", thus overriding the Paragraph's setting?

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• WPF: "Items collection must be empty before using ItemsSource."

  - by Zack Peterson

  I'm trying to get images to display in a WPF ListView styled like a WrapPanel as described in this old ATC Avalon Team article: How to Create a Custom View. When I try to populate the ListView with a LINQ-to-Entities queried collection of ADO.NET Entity Framework objects I get the following exception: Exception Items collection must be empty before using ItemsSource. My code… Visual Basic Private Sub Window1_Loaded(...) Handles MyBase.Loaded ListViewImages.ItemsSource = From g In db.Graphic _ Order By g.DateAdded Ascending _ Select g End Sub XAML <ListView Name="ListViewImages" SelectionMode="Single" ItemsSource="{Binding}"> <local:ImageView /> </ListView> I put a breakpoint on that line. ListViewImages.ItemsSource is Nothing just before the LINQ assignment.

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• WPF/MVVM - should we create a different Class for each ViewModel ?

  - by FMFF

  I'm attempting the example from the excellent "How Do I" video for MVVM by Todd Miranda found in MSDN. I'm trying to adapt the example for my learning purpose. In the example, he has a ViewModel called EmployeeListViewModel. Now if I want to include Departments, should I create another ViewModel such as DepartmentListViewModel? The example has EmployeeRepository as the Data Source. In my case, I'm trying to use an Entity object as the datasource (Employees.edmx in Model folder and EmployeeRepository.cs in DataAccess folder). If I want to display the list of Departments, should I create a separate class called DepartmentRepository and put all department related method definitions there? What if I want to retrieve the employee name and their department's name together? Where should I place the methods for this? I'm very new to WPF and MVVM and please let me know if any of the above needs to be re-phrased. Thank you for all the help.

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• WPF ItemsControl - how to know when the items finished loading, so that I can focus the first one?

  - by Tomáš Kafka

  Hi everyone, I have an ItemsControl in my View, that is bound to an ObservableCollection from ViewModel. The collection is filled, and afterwards an event from VM to view is raised (think search results and SearchFinished event). I would like to move keyboard focus to the first item in an ItemsControl, but when I do it in View's code-behind when handling SearchFinished, the items are not yet rendered (the collection is filled already, but wpf's rendering is asynchronous and didn't happen yet), so there is nothing to focus (Focus() needs to have the items' visual tree already constructed). I wanted to do (myItemsControl.ItemContainerGenerator.ContainerFromIndex(0) as UIElement).Focus();, but as the 0th item is not yet loaded, ContainerFromIndex(0) returns null. I tried delaying it with Dispatcher.BeginInvoke... with low priority, but that is dependent on exact timing and usually doesn't work. How can I wait until the first item in ItemsControl is Loaded?

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• Wpf- Is there any way to disable some of the default hotkeys in a RichTextBox?

  - by Justin

  I have several keybindings in my text editing application that no longer work now that I have switched from using a regular textbox to using a richtextbox. This is because the wpf richtextbox has several default hokeys such as "Ctrl+1", "Ctrl+2", and "Ctrl+5". My keybindings are defined in a view that contains the view that the richtextbox is in. I can't move the keybindings to the richtextbox; Is there any fix for this problem? Other than using a third-party control or creating my own richtextbox from textboxbase.

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• Has anyone noticed that a WPF file dialog will pass a click through to the UI when double clicking t

  - by Ben

  I have some buttons on my WPF UI and I also need to choose files from time to time. I kept noticing strange problems where when I double-click an item in the file dialog, a button on the main UI would also get clicked. After experimenting, it seems that if you line up an item in the file dialog with a button behind it on the main UI and double click to select the file, it will single-click the button behind it as well. Has anyone else noticed this, or is it just a freak bug with the way I have my UI laid out?

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• How to bind a List to a WPF treeview using Xaml?

  - by Joan Venge

  I don't know how to bind a List of Drink to a WPF TreeView. struct Drink { public string Name { get; private set; } public int Popularity { get; private set; } public Drink ( string name, int popularity ) : this ( ) { this.Name = name; this.Popularity = popularity; } } List<Drink> coldDrinks = new List<Drink> ( ){ new Drink ( "Water", 1 ), new Drink ( "Fanta", 2 ), new Drink ( "Sprite", 3 ), new Drink ( "Coke", 4 ), new Drink ( "Milk", 5 ) }; } } I have searched the web, for instance saw here. But what's this even mean: ItemsSource="{x:Static local:TreeTest.BoatList}" x:? static? local? How do you specify a collection in your code in the xaml?

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• WPF Dispatcher {"The calling thread cannot access this object because a different thread owns it."}

  - by user359446

  first I need to say that I´m noob with WPF and C#. Application: Create Mandelbrot Image (GUI) My disptacher works perfektly this this case: private void progressBarRefresh(){ while ((con.Progress) < 99) { progressBar1.Dispatcher.Invoke(DispatcherPriority.Send, new Action(delegate { progressBar1.Value = con.Progress; } )); } } I get the Message (Title) when tring to do this with the below code: bmp = BitmapSource.Create(width, height, 96, 96, pf, null, rawImage, stride); this.Dispatcher.Invoke(DispatcherPriority.Send, new Action(delegate { img.Source = bmp; ViewBox.Child = img; //vllt am schluss } )); I will try to explain how my program works. I created a new Thread (because GUI dont response) for the calculation of the pixels and the colors. In this Thread(Mehtod) I´m using the Dispatcher to Refresh my Image in the ViewBox after the calculations are ready. When I´m dont put the calculation in a seperate Thread then I can refresh or build my Image.

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• How to activate new page on some event in MVVM-WPF?

  - by Naresh Goradara

  Hi, I have a list page which list records in graphical representation. On clicking a some graphical portion or some button-which is added runtime on page- i want to activate new page by passing a some data as a parameter. Eg. I have Category list page, the UI representation is done at runtime. So clicking on some category I want to list its related Product on another page, I am getting its-CategoryID, Now, my problem is activating/displaying new page in MVVM patern in WPF. Just like Response.Redirect in ASP.Net Thanks in advance for your valuable suggestion.

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• WPF. How do I create many LIstViews with the same look.

  - by Erik Z

  I've defined a listview in my recent project and realized that I will be using more listviews looking exactly the same and having the same solumns. Since I'm new to WPF am I curious of teh best way to do this. Is it to create a usercontrol? Use styles? I've tried to use styles but it didnt work the way I was hoping. I tried to set the "View" property using style, like this. <Style x:Key="ListViewStyle" TargetType="{x:Type ListView}"> <Setter Property="View"> <ListView.View> <GridView> But it didnt work so I'm asking for your opinion?! Thanks.

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• Can you use data binding with the Content property of a WPF Frame?

  - by dthrasher

  I can use data binding to set the initial Content of a WPF Frame, but subsequent changes to the the bound property (implemented using INotifyPropertyChange) do not seem to change the content. Also, does anyone know if binding directly to the Content property in this way will cause the bound item to appear in the Frame or NavigationWindow's journal? Some context: I realize that I should probably be using the NavigationService to interact with the Frame, but I'm attempting to follow the MVVM pattern. It seems like it would be much simpler to databind to the Content property...

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• Has anyone noticed that a WPF file dialog will pass through a click to the UI when double clicking t

  - by Ben

  I have some buttons on my WPF UI and I also need to choose files from time to time. I kept noticing strange problems where when I double-click an item in the file dialog, a button on the main UI would also get clicked. After experimenting, it seems that if you line up an item in the file dialog with a button behind it on the main UI and double click to select the file, it will single-click the button behind it as well. Has anyone else noticed this, or is it just a freak bug with the way I have my UI laid out?

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• How do I get the co-ordinates of a mouse click on a transformed WPF control?

  - by BlackWasp

  I'm playing with a simple WPF application. One part of it includes a grid containing several controls. The grid is rotated using a LayoutTransform and a RotateTransform. I need to get the co-ordinates of a mouse-click relative to the top-left of the grid, taking the rotation into account. To be clear, let's say I have a single drawing surface within the grid and no transform had been applied. I then click at location X = 20, Y = 10 and put a dot on the drawing surface at that point. If the grid is now rotated by 30 degrees and I click on the dot (which is also moved by the rotation), the click position should still be X = 20, Y = 10.

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