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  • How to autoscroll on WPF datagrid

    - by Christian
    Hi, I think I am stupid. I searched now for 15 minutes, and found several different solutions for scrolling on datagrids, but none seems to work for me. I am using WPF with .NET 3.5 and the WPF Toolkit DataGrid. My grid gets updated when my observable collection changes, works perfectly. Now, my DataGrid is located inside a normal Grid and scrollbars appear if the DataGrid gets to big. Also fine... And know, the 1.000.000 $ question: How do I get the datagrid to scroll to the last row. There is: no AutoScroll Property no CurrentRowSelected Index a CurrentCell, but no Collection I could use for CurrentCell = AllCells.Last Any ideas? I feel really stupid, and it seems strange that this question is so hard. What am I missing?

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  • Force validation on bound controls in WPF

    - by Valentin Vasilyev
    Hello. I have a WPF dialog with a couple of textboxes on it. Textboxes are bound to my business object and have WPF validation rules attached. The problem is that user can perfectly click 'OK' button and close the dialog, without actually entering the data into textboxes. Validation rules never fire, since user didn't even attempt entering the information into textboxes. Is it possible to force validation checks and determine if some validation rules are broken? I would be able to do it when user tries to close the dialog and prohibit him from doing it if any validation rules are broken. Thank you.

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  • Binding to a WPF hosted control's DependencyProperty in WinForms

    - by Reddog
    I have a WinForms app with some elements that are hosted WPF user controls (using ElementHost). I want to be able to bind my WinForm's control property (Button.Enabled) to a custom DependencyProperty of the hosted WPF user control (SearchResults.IsAccountSelected). Is it possible to bind a System.Windows.Forms.Binding to a property managed by a DependencyProperty? Also, since I know the System.Windows.Forms.Binding watches for INotifyPropertyChanged.PropertyChanged events - will a property backed by a DependencyProperty automatically fire these events or will I have to implement and manage the sending of PropertyChanged events manually?

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  • Loading WPF satellite resources dynamically

    - by BJ
    Hello! I've read about satellite-assemblies being used in WPF localizations. However, I would like to ask if there is a way to load the satellite-assemblies without following the pre-defined directory structure that depends on the language (ex. If the system language is English, the WPF application looks for the satellite-assembly inside the "en-US" subfolder). This is because I would like to simply swap the satellite-assemblies when distributing the software package without having to create a specific folder per language that would hold the assemblies. I would just like to have the satellite-assembly and the main executable in the same directory. Is this possible and is there even an easy way to do this like simply loading the resource file on application startup once? Thanks!

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  • wpf usercontrol within usercontrol with the help of region manager

    - by Miral
    Sorry for weird title, actually i can only explain my question but cannot put in a few words in the title. I am developing WPF Composite application with PRISM approach. I have got a common WPF usercontrol which is gonna be used by all other usercontrol, i.e. usecontrol within a usercontrol. The common usercontrol has got a button "ProcessMultiple" which I want it to behave differently from all usercontrol. I am using RegionManager to add this views. I have got PresentationModel for all the usercontrol IRegion historyUpdaterRegion = _regionManager.Regions["HistoryUpdaterRegion"]; IRegionManager historyUpdaterRegionManager = historyUpdaterRegion.Add(_unityContainer.Resolve<IHistoryDocumentUpdaterPresentationModel>().View, null, true); historyUpdaterRegionManager.RegisterViewWithRegion("ProcessMultiple", () => _unityContainer.Resolve<IProcessMultiplePresentationModel>().View); IRegion refundArrivalRegion = _regionManager.Regions["RefundArrivalRegion"]; IRegionManager refundArrivalRegionManager = refundArrivalRegion.Add(_unityContainer.Resolve<IRefundArrivalProcessorPresentationModel>().View, null, true); refundArrivalRegionManager.RegisterViewWithRegion("ProcessMultiple", () => _unityContainer.Resolve<IProcessMultiplePresentationModel>().View);

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  • How to use a FolderBrowserDialog from a WPF application

    - by Craig Shearer
    I'm trying to use the FolderBrowserDialog from my WPF application - nothing fancy. I don't much care that it has the Windows Forms look to it. However, when I call ShowDialog, I want to pass the owner window which is an IWin32Window. How do I get this from my WPF control? Actually, does it matter? If I run this code and use the ShowDialog overload with no parameters it works fine. Under what circumstances do I need to pass the owner window? Thanks, Craig

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  • WPF - RibbonControlLibrary not supported with Visual Studio 2010 ?

    - by KroaX
    Hi guys, Today i licensed and downloaded the WPF RibbonControlsLibrary from Microsoft which is an extension to the WPF Toolkit. I've read some tutorials to implement an examlpe here When I tried the example is sadly noticed that in XAML i could not access the referenced library. xmlns:ribbon="clr-namespace:Microsoft.Windows.Controls.Ribbon;assembly=RibbonControlsLibrary" <ribbon:Ribbon .... > I found out that the Problem lies within Visual Studio 2010 , because in Visual Studio 2008 everything works fine. Does anyone have a solution for this issue or a workaround to use the library in Visual Studio 2010 ?

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  • Windows gadget in WPF - show while "Show desktop" is activated

    - by Jannick
    Hi I'm trying to create a "gadget" like application using WPF. The goal is to get the same behavior as a normal Windows 7 gadget: No task-bar entry Doesn't show up when you alt+tab windows NOT always on top, applications can be on top Visible while performing 'Aero Peek' Visible while using 'Show desktop' / Windows+D I've been able to accomplish the first four goals, but have been unable to find a solution to the fifth problem. The closest I've come is by using the utility class from http://stackoverflow.com/questions/75785/how-do-you-do-appbar-docking-to-screen-edge-like-winamp-in-wpf, but this turns the app into a "toolbar", thereby banishing applications from the part of the screen where my gadget GUI is placed. I can see that similar questions has been asked previously on Stackoverflow, but those have died out before a solution was found. Posting anyway in the hope that there is now someone out there with the knowledge to solve this =)

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  • WPF WIN32 hwndhost WM_MOUSEMOVE WM_MOUSEHOVER

    - by Neil B
    I have a WPF app with a usercontrol that contains a HwndHost. The HwndHost is created as follows: hwndHost = CreateWindowEx(0, "static", "", WS_CHILD | WS_VISIBLE, 0, 0, hostHeight, hostWidth, hwndParent.Handle, (IntPtr)HOST_ID, IntPtr.Zero, 0); hwndControl = CreateWindowEx(0, "Static", "", WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN , 0, 0, hostHeight, hostWidth, hwndHost, (IntPtr)PICTUREBOX_ID, IntPtr.Zero, 0); I then hook into the message pump using HwndSourceHook and loads of messages come through. Except the ones I want i.e. WM_MOUSEMOVE, WM_MOUSEHOVER, WM_LBUTTONDOWN and WM_LBUTTONUP Also the OnMouseLeftButtonDown event is not fired in the WPF code on the main window or the control, I assume because windows is trapping it and throwing it away. Anybody know how I can get these to come through, either with or without using the WIN32 window messages?

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  • C# WPF application is using too much memory while GC.GetTotalMemory() is low

    - by Dmitry
    I wrote little WPF application with 2 threads - main thread is GUI thread and another thread is worker. App has one WPF form with some controls. There is a button, allowing to select directory. After selecting directory, application scans for .jpg files in that directory and checks if their thumbnails are in hashtable. if they are, it does nothing. else it's adding their full filenames to queue for worker. Worker is taking filenames from this queue, loading JPEG images (using WPF's JpegBitmapDecoder and BitmapFrame), making thumbnails of them (using WPF's TransformedBitmap) and adding them to hashtable. Everything works fine, except memory consumption by this application when making thumbnails for big images (like 5000x5000 pixels). I've added textboxes on my form to show memory consumption (GC.GetTotalMemory() and Process.GetCurrentProcess().PrivateMemorySize64) and was very surprised, cuz GC.GetTotalMemory() stays close to 1-2 Mbytes, while private memory size constantly grows, especially when loading new image (~ +100Mb per image). Even after loading all images, making thumbnails of them and freeing original images, private memory size stays at ~700-800Mbytes. My VirtualBox is limited to 512Mb of physical memory and Windows in VirtualBox starts to swap alot to handle this huge memory consumption. I guess I'm doing something wrong, but I don't know how to investigate this problem, cuz according to GC, allocated memory size is very low. Attaching code of thumbnail loader class: class ThumbnailLoader { Hashtable thumbnails; Queue<string> taskqueue; EventWaitHandle wh; Thread[] workers; bool stop; object locker; int width, height, processed, added; public ThumbnailLoader() { int workercount,i; wh = new AutoResetEvent(false); thumbnails = new Hashtable(); taskqueue = new Queue<string>(); stop = false; locker = new object(); width = height = 64; processed = added = 0; workercount = Environment.ProcessorCount; workers=new Thread[workercount]; for (i = 0; i < workercount; i++) { workers[i] = new Thread(Worker); workers[i].IsBackground = true; workers[i].Priority = ThreadPriority.Highest; workers[i].Start(); } } public void SetThumbnailSize(int twidth, int theight) { width = twidth; height = theight; if (thumbnails.Count!=0) AddTask("#resethash"); } public void GetProgress(out int Added, out int Processed) { Added = added; Processed = processed; } private void AddTask(string filename) { lock(locker) { taskqueue.Enqueue(filename); wh.Set(); added++; } } private string NextTask() { lock(locker) { if (taskqueue.Count == 0) return null; else { processed++; return taskqueue.Dequeue(); } } } public static string FileNameToHash(string s) { return FormsAuthentication.HashPasswordForStoringInConfigFile(s, "MD5"); } public bool GetThumbnail(string filename,out BitmapFrame thumbnail) { string hash; hash = FileNameToHash(filename); if (thumbnails.ContainsKey(hash)) { thumbnail=(BitmapFrame)thumbnails[hash]; return true; } AddTask(filename); thumbnail = null; return false; } private BitmapFrame LoadThumbnail(string filename) { FileStream fs; JpegBitmapDecoder bd; BitmapFrame oldbf, bf; TransformedBitmap tb; double scale, dx, dy; fs = new FileStream(filename, FileMode.Open); bd = new JpegBitmapDecoder(fs, BitmapCreateOptions.None, BitmapCacheOption.OnLoad); oldbf = bd.Frames[0]; dx = (double)oldbf.Width / width; dy = (double)oldbf.Height / height; if (dx > dy) scale = 1 / dx; else scale = 1 / dy; tb = new TransformedBitmap(oldbf, new ScaleTransform(scale, scale)); bf = BitmapFrame.Create(tb); fs.Close(); oldbf = null; bd = null; GC.Collect(); return bf; } public void Dispose() { lock(locker) { stop = true; } AddTask(null); foreach (Thread worker in workers) { worker.Join(); } wh.Close(); } private void Worker() { string curtask,hash; while (!stop) { curtask = NextTask(); if (curtask == null) wh.WaitOne(); else { if (curtask == "#resethash") thumbnails.Clear(); else { hash = FileNameToHash(curtask); try { thumbnails[hash] = LoadThumbnail(curtask); } catch { thumbnails[hash] = null; } } } } } }

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  • Consume a WebService with Integrated authentication from WPF windows application

    - by Tr1stan
    I have written a WPF windows application that consumes a .net WebService. This works fine when the web service in hosted to allow anonymous connections, however the WebService I need to consume when we go live will be held within a website that has Integrated Authentication enabled. The person running the WPF application will be logged onto a computer within the same domain as the web server and will have permission to see the WebService (without entering any auth info) if browsing to it using a web browser that is NTLM auth enabled. Is it possible to pass through the details of the already logged in user running the application to the WebService? Here is the code I'm currently using: MyWebService.SearchSoapClient client = new SearchSoapClient(); //From the research I've done I think I need to something with these: //UserName.PreAuthenticate = true; //System.Net.CredentialCache.DefaultCredentials; List<Person> result = client.FuzzySearch("This is my search string").ToList(); Any pointers much appreciated.

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  • WPF: How to specify units in Dialog Units?

    - by Ian Boyd
    i'm trying to figure out how to layout a simple dialog in WPF using the proper dialog units (DLUs). i spent about two hours dimensioning this sample dialog box from Windows Vista with the various dlu measurements. Can someone please give the corresponding XAML markup that generates this dialog box? (Image Link) Now admittedly i know almost nothing about WPF XAML. Every time i start, i get stymied because i cannot figure out how to place any control. It seems that everything in WPF must be contained on a panel of some kind. There's StackPanels, FlowPanels, DockPanel, Grid, etc. If you don't have one of these then it won't compile. The only XAML i've been able to come up with (uing XAMLPad) so far: <DockPanel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Image Width="23" /> <Label>Are you sure you want to move this file to the Recycle Bin?</Label> <Image Width="60" /> <Label>117__6.jpg</Label> <Label>Type: ACDSee JPG Image</Label> <Label>Rating: Unrated</Label> <Label>Dimensions: 1072 × 712</Label> <Button Content="Yes" Width="50" Height="14"/> <Button Content="Cancel" Width="50" Height="14"/> </DockPanel> Which renders as a gaudy monstrosity. None of the controls are placed or sized right. i cannot figure out how to position controls in a window, nor size them properly. Can someone turn that screenshot into XAML? Note: You're not allowed to measure the screenshot. All the Dialog Unit (dlu) widths and heights are specified. Note: 1 horizontal DLU != 1 vertical DLU. Horizontal and vertical DLUs are different sizes. Links Microsoft User Experience Guidelines: Recommended sizing and spacing Microsoft User Experience Guidelines: Layout Metrics Bump: 2011/05/14 (15 months later)

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  • WPF command/click argument

    - by Joel Barsotti
    So I have a background in ASP.NET where a button could have a click handler or a command handler and then a command argument. That pattern was great for when you had a bunch of buttons that basically needed to execute the same block of code with only a slightly different argument. Is there a collary in WPF? From what I've seen of the Command in WPF is that it revolves around an action that is independent of the control that invokes it (and still doesn't provide a way to provide an argument). Which is not really what I need.

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  • Serialize WPF component using XamlWriter without default constructor

    - by mizipzor
    Ive found out that you can serialize a wpf component, in my example a FixedDocument, using the XamlWriter and a MemoryStream: FixedDocument doc = GetDocument(); MemoryStream stream = new MemoryStream(); XamlWriter.Save(doc, stream); And then to get it back: stream.Seek(0, SeekOrigin.Begin); FixedDocument result = (FixedDocument)XamlReader.Load(stream); return result; However, now I need to be able to serialize a DocumentPage as well. Which lacks a default constructor which makes the XamlReader.Load call throw an exception. Is there a way to serialize a wpf component without a default constructor?

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  • WPF Application Hang

    - by Karim
    Hi, I'm using Windows 7 Professional (x64) and having installed .NET 4.0 RTM on my machine. Since 2 days I'm noticing that every WPF application that I'm trying to run hangs and becomes non responsive (a not responding text is appended to it's title bar) and it's painted white. There is no info regarding any exception, no error message. Nothing. Even the Event Log shows that there was "application hang" event (code 1002) and nothing more. This problem is for everything that is written in WPF, even for products like NHibernate Profiler and other stuff that I was using on a regular basis without any issues. Tried to reinstall .NET 4.0 and nothing changed. Any ideas why this might be happening?

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  • WPF Application that only has a tray icon

    - by Michael Stum
    I am a total WPF newbie and wonder if anyone could give me some pointers how to write an application that starts minimized to tray. The idea is that it periodically fetches an RSS Feed and creates a Toaster-Popup when there are new feeds. The Application should still have a Main Window (essentially just a list containing all feed entries), but that should be hidden by default. I have started reading about XAML and WPF and I know that the StartupUri in the App.xaml has to point to my main window, but I have no idea what the proper way is to do the SysTray icon and hide the main window (this also means that when the user minimizes the window, it should minimize to tray, not to taskbar). Any hints?

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  • Mouse scroll not working in a scroll viewer with a wpf datagrid and additional UI elements

    - by paladugu457
    I am trying to figure out how to get the mouse scroll working on a wpf window with a scrollviewer and a datagrid within it. The WPF and C# code is below <ScrollViewer HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Auto"> <Grid> <Grid.RowDefinitions> <RowDefinition/> <RowDefinition/> </Grid.RowDefinitions> <Grid Grid.Row="0"> <Border Name="DataGridBorder" BorderThickness="2" Margin="1" CornerRadius="4" BorderBrush="#FF080757"> <dg:DataGrid AutoGenerateColumns="False" Name="ValuesDataGrid" BorderThickness="0" CanUserResizeColumns="True" FontWeight="Bold" HorizontalScrollBarVisibility="Auto" CanUserReorderColumns="False" IsReadOnly="True" IsTextSearchEnabled="True" AlternationCount="2" SelectionMode="Extended" GridLinesVisibility="All" HeadersVisibility="Column" CanUserAddRows="False" CanUserDeleteRows="False" CanUserResizeRows="False" CanUserSortColumns="False" RowDetailsVisibilityMode="Collapsed" SelectedIndex="0" RowStyle="{StaticResource CognitiDataGridRowStyle}" > <dg:DataGrid.Columns> <dg:DataGridTemplateColumn Header="Title" > <dg:DataGridTemplateColumn.CellTemplate> <DataTemplate> <StackPanel Orientation="Horizontal" > <TextBlock HorizontalAlignment="Left" VerticalAlignment="Center" Text="{Binding Path=Name}" FontWeight="Normal" /> </StackPanel> </DataTemplate> </dg:DataGridTemplateColumn.CellTemplate> </dg:DataGridTemplateColumn> </dg:DataGrid.Columns> </dg:DataGrid> </Border> </Grid> <Button Grid.Row="1" Height="90" >hello world</Button> </Grid> </ScrollViewer> and the C# code is as follows public partial class Window1 : Window { public Window1() { InitializeComponent(); initialize(); } public void initialize() { ObservableCollection<MyObject> testList = new ObservableCollection<MyObject>(); for (int i = 0; i < 20; i++) { MyObject my = new MyObject("jack " + i); testList.Add(my); } ValuesDataGrid.ItemsSource = testList; } } public class MyObject { public string Name { get; set; } public MyObject(string name) { Name = name; } } The problem i am facing is that when using the mouse to scroll, it works fine when it is over the button but as soon as i move the mouse pointer over the grid and try to scroll, nothing happens. I am able to move the scrollbar of the scrollviewer directly though. I am still a wpf novice so any help on how to get the mouse scroll to work over the datagrid would be appreciated. I am guessing there should be a pretty easy solution for this but I havent been able to figure it out

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  • Ellipse Drawing WPF Animation

    - by widmayer
    I am developing a control that is a rectangle area and will draw an ellipse in the rectangle area when a trigger occurs. This control will be able to host other controls like, textbox's, buttons, etc. so the circle will be drawn around them when triggered. I want the circle being drawn as an animation like you were circling the inner controls with a pen. My question is whats the best way to accomplish this. I've been doing some research and I could use WPF animation or I could use GDI+ to accomplish the tasks. I am new to WPF animation so that is why I am asking the question.

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  • Deploying WPF application: .NET 3.5 issues

    - by Robbert Dam
    Hi all, Users around my country are currently beta-testing our application. My app uses WPF & Linq, so I need .NET 3.5 installation. On most system, everything works find, including automatic installation on .NET 3.5 on machines that do not have that installed yet. However, on one machine (XP SP2) my application does not run. The user reported no issues during .NET 3.5 installation (except for a process that need to close before the installer could continue - he closed the process and continued). The application crashes on startup. To debug this issue, I did the following: Have him reboot his machine Let him manually re-install the .NET 3.5 framework (no errors reported) Have him run a test WPF app that only displays a button - also crashes Let him send the .NET 3.5 installation logs - these are huge, don't now where to look Does anyone have strategy on how to debug such issues? I expect that this will occur more when the application is released..

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