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• WPF CheckBox style with the TextWrapping

  - by Shurup

  I need you a TextWrapping in the WPF CheckBox. Please look at this two samples: <CheckBox> <TextBlock TextWrapping="Wrap" Text="_This is a long piece of text attached to a checkbox."/> </CheckBox> <CheckBox> <AccessText TextWrapping="Wrap" Text="_This is a long piece of text attached to a checkbox."/> </CheckBox> If I use a TextBlock in the Content of the CheckBox, the check element (vertical alignment is top) and the text displays properly, but not the accelerator. If I use an AccessText in the Content of the CheckBox, the check element displays wrong (vertical alignment is center). How to change the style of the elements to display this CheckBox correct?

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• WPF TreeView databinding to hide/show expand/collapse icon

  - by Julian Lettner

  I implemented a WPF load-on-demand treeview like described in this (very good) article. In the mentioned solution a dummy element is used to preserve the expand + icon / treeview item behavior. The dummy item is replaced with real data, when the user clicks on the expander. I want to refine the model by adding a property public bool HasChildren { get { ... } } to my backing TreeNodeViewModel. Question: How can I bind this property to hide/show the expand icon (in XAML)? I am not able to find a suitable trigger/setter combination. (INotifyPropertyChanged is properly implemented.) Thanks for your time. Update 1: I want to use my property public bool HasChildren instead of using the dummy element. Determining whether or not an item has children is somewhat costly, but still much cheaper than fetching the children.

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• WPF ListView ScrollViewer Double-Click Event

  - by Sentax

  Doing the below will reproduce my problem: New WPF Project Add ListView Name the listview: x:Name="lvList" Add enough ListViewItems to the ListView to fill the list completely so a vertical scroll-bar appears during run-time. Put this code in the lvList.MouseDoubleClick event Debug.Print("Double-Click happened") Run the application Double-click on the LargeChange area of the scroll-bar (Not the scroll "bar" itself) Notice the Immediate window printing the double-click happened message for the ListView How do I change this behavior so MouseDoubleClick only happens when the mouse is "over" the ListViewItems and not when continually clicking the ScrollViewer to scroll down/up in the list?

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• WPF WebBrowser NavigateToString vs NavigateToStream (hebrew/non-utf8 encodings)

  - by David E

  When I use WPF WebBrowser's NavigateToString method to display UTF8 html (with hebrew text in it) it's displayed perfectly. However, when I try to use the NavigateToString to display html with hebrew text in it in a non-utf8 encoding (CodePage 1255 to be exact) the hebrew is messed up. I checked the cp1255 string in Visual Studio's debugger and it looks great, and also when I save the source of the web browser's contents and open it with an external browser it looks great. If I use the NavigateToStream method instead of the NavigateToString method it works great. What's the problem with the NavigateToString? am I doing something wrong?

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• WPF - Pan & Zoom Image

  - by Yuval Peled

  I want to create a simple image viewer in WPF that will enable the user to: Pan (by mouse dragging the image). Zoom (with a slider). Show overlays (rectangle selection for example). Show original image (with scroll bars if needed). Can you explain how to do it? I didn't find a good sample on the web. Should I use ViewBox? Or ImageBrush? Do I need ScrollViewer? Thanks!

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• Paste Event in a WPF TextBox

  - by code-zoop

  I have created a custom control inheriting TextBox. This custom control is a numeric TextBox, only supporting numbers. I am using OnPreviewTextInput to check each new character being typed to see if the character is a valid input. This works great. However, if I paste the text into the TextBox, OnPreviewTextInput is not fired. What is the best way to capture pasted text in a TextBox? Also, I have a problem when the back space is pressed, I can't figure out what event this will fire. OnPreviewTextInput is not fired! any ideas how to capture pasted text and back space events in WPF TextBox? Thanks

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• How to make WPF DataGrid Column Header transparent

  - by joerage

  Hi, I am trying to make the column header of my WPF Datagrid to be transparent. I am able to set it to a color without problem, but I can't have it transparent. Here is what I tried: <Style x:Key="DatagridColumnHeaderStyle" TargetType="{x:Type tk:DataGridColumnHeader}"> <Setter Property="Background" Value="Transparent" /> <Setter Property="Foreground" Value="#C2C4C6" /> </Style> <Style x:Key="DashboardGridStyle" TargetType="{x:Type tk:DataGrid}"> <Setter Property="ColumnHeaderStyle" Value="{StaticResource DatagridColumnHeaderStyle}" /> <Setter Property="Background" Value="Transparent" /> <Setter Property="RowBackground" Value="Transparent" /> </Style> <tk:DataGrid Style="{StaticResource DashboardGridStyle}" > ... </tk:DataGrid> With this code, it seems to take the default brush. What am I missing?

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• WPF HwndHost keyboard focus

  - by Adal

  The chart area in the screenshot is a HwndHost control which hosts a native Win32 window (with it's own registered WNDCLASS) implemented in C++/CLI and drawn with Direct2D. The HwndHost is hosted in a WPF Border control. The problem I have is that I can't set the keyboard focus to the hosted Win32 window. I want the focus to move to the hosted Win32 window when the used clicks on the chart area. I tried calling SetFocus on WM_LBUTTONDOWN, but that screws app the focus in the rest of the application. Currently, even if I click on the Win32 window, the focus remains on the tree-view on the left, and if I press the up/down cursor keys, the tree-view will get them, not the chart window. How do I make the hosted Win32 window receive keyboard input from when the user clicks on the chart area, until it clicks on another control (like the tree-view, or the toolbar)?

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• Rendering WPF DrawingGroup to single ImageSource

  - by Xander

  Currently I'm using a System.Windows.Media.DrawingGroup to store some tiled images (ImageDrawing) inside the Children-DrawingCollection property. Well the problem is now, this method gets really slow if you display the entire DrawingGroup in an Image control, because my DrawingGroup can contain hundreds or even thousands of small images it can really mess up the performance. So my first thought was to somehow render a single image from all the small ones inside the DrawingGroup and then only display that image, that would be much faster. But as you might have figured out I haven't found any solution so simply combine several images with WPF Imaging. It would really be great if someone could help with this problem or tell me how i can improve the performance with the DrawingGroup or even use another approach. One last thing, currently I'm using a RenderTargetBitmap to generate a single BitmapSource from the DrawingGroup, this approach isn't really faster, but it makes the scrolling and working on the Image control at least a little smoother.

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• Custom CheckBox in WPF DataGrid does not update binding

  - by Pakman

  In my Visual Studio 2010 WPF application, I have the following (simplified) style: <Style x:Key="MyStyle" TargetType="{x:Type CheckBox}"> <Setter Property="Background" Value="Blue" /> </Style> If I use it as the ElementStyle AND EditingElementStyle in my DataGridCheckBoxColumn: <DataGridCheckBoxColumn Binding="{Binding IsEnabled}" ElementStyle="{StaticResource MyStyle}" EditingElementStyle="{StaticResource MyStyle}" /> Then my binding, IsEnabled, does not toggle when I check/uncheck a row's checkbox. If I remove either ElementStyle, EditingElementStyle, or both, then the binding updates no problem. Why is this?! Also, I tried to work around the problem using the following code: <DataGridTemplateColumn> <DataGridTemplateColumn.CellTemplate> <DataTemplate> <CheckBox IsChecked="{Binding IsEnabled}" /> </DataTemplate> </DataGridTemplateColumn.CellTemplate> </DataGridTemplateColumn> However, the problem remains.

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• WPF FlowDocument - Absolute Character Position

  - by Alan Spark

  I have a WPF RichTextBox that I am typing some text into and then parsing the whole of the text to do processing on. During this parse, I have the absolute character positions of the start and end of each word. I would like to use these character positions to apply formatting to certain words. However, I have discovered that the FlowDocument uses TextPointer instances to mark positions in the document. I have found that I can create a TextRange by constructing it with start and end pointers. Once I have the TextRange I can easily apply formatting to the text within it. I have been using GetPositionAtOffset to get a TextPointer for my character offset but suspect that its offset is different from mine because the selected text is in a slightly different position from what I expect. My question is, how can I accurately convert an absolute character position to a TextPointer?

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• WPF Frame accessing parent page controls

  - by Mitch

  I have a WPF page that contains a Listbox and a frame. The frame has various pages loaded into it determined by the selection within the Listbox. Each page within the frame has a variety of different input boxes and has a Save Cancel button. When the Save button is clicked I need the content to be saved to the database and the Listbox in the parent page to be refreshed to reflect the new data. Saving the data is easy but how do I initiate a refresh on the contents of the Listbox in the parent page when calling it from the page that inside the frame? I need to somehow be able to access the parent pages controls to do this. Any ideas?

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• WPF, PreviewKeyDown event and underscore char

  - by commanderz

  Hi, I'm catching key hits with PreviewKeyDown event in my WPF component. I need to distinguish characters being typed: letters vs. numbers vs. underscore vs. anything else. Letters and numbers work fine (just convert the Key property of the KeyEventArgs object to string and work with character 0 of that string), but this won't work for underscore. It's ToString value depends on localized keyboard settings (it shows up as "OemMinus" on EN/US keyboard and "OemQuestion" on CZ/QWERTY keyboard). So how can I RELIABLY find out, if the typed char is underscore in the PreviewKeyDown event? Thanks for any help

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• C# / WPF / .NET - Drag and drop to Desktop / Explorer

  - by Dänu

  Hey Guys Following my scenario. I got an Application which loads a Filestructure (Folders, Files) from a Database into a WPF ListView. Now I'd like to grab a file from this ListView, drag it over my Desktop (or some open explorer window) and drop it there. Basic Drag and Drop, nothing fancy. This sounds like a "standard" function for a windows application - but google won't help. So how can I achieve this? Interops? Thanks Edit: Thanks for the solution, I still had to do some googling. Here's my complete solution.

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• WPF TextBlock highlight certan parts based on search condition

  - by Daniil Harik

  Hello, I have TextBlock that has Inlines dynamicly added to it (basically bunch of Run objects that are either italic or bold). In my application I have search function. I want to be able to highlight TextBlock's text that is in being searched for. By highlighting I mean changing certain parts of TextBlock text's color (keeping in mind that it may highlight several different Run objects at a time). I have tried this example http://blogs.microsoft.co.il/blogs/tamir/archive/2008/05/12/search-and-highlight-any-text-on-wpf-rendered-page.aspx But it seams very unstable :( Is there easy way to solve this problem?

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• WPF Combobox textbox not updating when binding changes.

  - by WillH

  I have a WPF CombBox as follows: <ComboBox ItemsSource="{Binding Source={StaticResource myList}}" SelectedItem="{Binding Path=mySelectedItem}" /> The problem I have is that when the bound value changes, the selected value in the combobox's textbox does not update. (Note - the values in the combobox list do update). I am using MVVM so I can detect in the view model when the binding changes and call a property changed event and this is updating the combobox, but not the value displayed within the textbox. I think this could be done in the template of the combobox - somehow make the textbox be bound to the selecteditem of the combobox, or always update when it updates? I don't know how to do this though so any advice would be most appreciated.

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• WPF ShowDialog returns immediately

  - by dthrasher

  Sometimes when I call ShowDialog on an OpenFileDialog Window in WPF, the dialog closes immediately with a return value of false. I'm calling ShowDialog in response to a button click event. I can reproduce this problem using the sample code for OpenFileDialog on MSDN: // Configure open file dialog box Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog(); dlg.FileName = "Document"; // Default file name dlg.DefaultExt = ".txt"; // Default file extension dlg.Filter = "Text documents (.txt)|*.txt"; // Filter files by extension // Show open file dialog box Nullable<bool> result = dlg.ShowDialog(); // Process open file dialog box results if (result == true) { // Open document string filename = dlg.FileName; } The problem occurs intermittently when I run my solution in Debug mode from Visual Studio 2008 SP1. It's quite annoying. Is this a known issue? Are there workarounds?

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• Disable selecting in WPF DataGrid

  - by svick

  How can I disable selecting in a WPFTooklit's DataGrid? I tried modifying the solution that works for ListView (from http://stackoverflow.com/questions/1051215/wpf-listview-turn-off-selection#comment-863179), but that doesn't work: <tk:DataGrid> <tk:DataGrid.ItemContainerStyle> <Style TargetType="{x:Type tk:DataGridRow}"> <Setter Property="Focusable" Value="false"/> </Style> </tk:DataGrid.ItemContainerStyle> <tk:DataGrid.CellStyle> <Style TargetType="{x:Type tk:DataGridCell}"> <Setter Property="Focusable" Value="false"/> </Style> </tk:DataGrid.CellStyle> </tk:DataGrid>

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• WPF DataGrid Printing Scrolled Visuals

  - by RichS

  I've been using the DataGrid (from WPF Toolkit), and have successfully created all of my data. The next step is that I want to print the entire DataGrid (scaled to a single printed page), even though the visible DataGrid in my Window is currently scrolled. When I prepare the DataGrid for printing, I've tried setting the DesiredSize to PositiveInfinity, and then calling Measure(.), to get the needed size of the DataGrid. But, when I call Arrange(.), it only prints the part of the DataGrid control that is currently visible on-screen. I know how to scale it to the correct size, but can't get the non-visible part of the DataGrid to be output to the printer. I've tried rendering to a Bitmap (RenderTargetBitmap), but that has the same problem. I also tried setting the MinHeight and MinWidth to be the same as the DesiredSize to try to /force/ things. But that doesn't work either. All I ever see in my printed page, is what was visible on-screen. Does anyone know how to solve this?

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• Convert WPF BitmapSource to Icon for window

  - by simmotech

  I have a 16x16 .png file which I have loaded as an ImageSource (BitmapSource) and it is working fine when I use it on an Image in a tabcontrol header. I now want to use that same image in a floating window (inherited from the WPF Window class) when the user drags the document tab. (This is AvalonDock which I have tweaked to allow images in the tab header) After many searches on the web, I understand that Window.Icon requires a BitmapFrame but all the sample code seems to assume that a .ico file is available which it isn't in my case. I have tried the following code (plus variants including cloning, freezing etc): var image = (Image) content.Icon; var bitmapSource = (BitmapSource) image.Source; Icon = BitmapFrame.Create(bitmapSource); but when the Show() method is called, an exception is thrown: "Exception of type 'System.ExecutionEngineException' was thrown." How can a I create a compatible bitmap on the fly to allow the Window to display the icon?

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• Best "For Pay" wpf controls

  - by Vaccano

  If this question has been asked then I applogize and I will join in voting to close it (or just delete it), but I could not find it being asked before. We are potentially embarking on making many of our apps using WPF. Most of our apps are normal business apps that will not need too much eye candy. Tasteful ui is nice, but I don't see us doing lost of custom animations and such. So, my question is what 3rd party control sets are the best ones to purchase to save you time in development of apps like this? (These should work with both Visual Studio 2008 and 2010.)

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• Vertical separator in WPF Ribbon

  - by Cassandra

  How can I add Vertical separator to WPF Ribbon, to RibbonGroup? I have tried something like that, but i got horizontal separator istead of vertical. <r:RibbonGroup> <r:RibbonButton Command="{StaticResource SomeButton}" /> <r:RibbonSeparator></r:RibbonSeparator> <r:RibbonToggleButton IsChecked="False" Command="{StaticResource AnotherButton}"/></r:RibbonToggleButton> </r:RibbonGroup> So how can I make vertical separator?

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• WPF Auto height in code

  - by Karim

  How could I set the value of the Height property of a WPF control in C# code to "Auto"? <Grid.RowDefinitions> <RowDefinition /> <RowDefinition Height="Auto" /> <RowDefinition /> <RowDefinition Height="Auto" /> <RowDefinition /> <RowDefinition Height="Auto" /> <RowDefinition /> <RowDefinition Height="Auto" /> <RowDefinition /> </Grid.RowDefinitions> I want to reproduce this behavior in the code behind. Any ideas? Thanks in advance

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• Updating a progress bar while wpf data binding is taking place (in c#)

  - by evan

  I bind a large dataset to a WPF list box which can take a long time (more than ten seconds). While the the data is being bound I'd like to display a circular progress bar I can't get the progress bar to show while the data binding is occurring, even though I am trying to do the binding in a backgroundworker. I tested it by making the first line of the backgroundworkd's dowork event a Thread.Sleep(5000) and sure enough the progress bar started spinning for that duration only to freeze while when the binding started. Is this because both the databinding and the UI updating have to occur on the same thread? Any ideas on how to work around it? Thanks for your help!!

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• wpf: DataGrid disable selected row styles - or row selecting

  - by Sonic Soul

  I am seeing a lot of examples on how to style Selected rows in DataGrid such as this one: http://stackoverflow.com/questions/1223280/how-can-i-set-the-color-of-a-selected-row-in-datagrid Can i just disabled selected row styling? i don't want to have to override every single thing that selected row changes. Just don't want any visible changes. Gotta be easier way than to create templates.. or.. disable selecting rows, if that is easier.. but from browsing this forum that seems hacky as well http://stackoverflow.com/questions/2496814/disable-selecting-in-wpf-datagrid

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