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• WPF: Aligning the base line of a Label and its TextBox

  - by Heinzi

  Let's say I have a simple TextBox next to a Label: <StackPanel> <StackPanel Orientation="Horizontal"> <Label Margin="3">MyLabel</Label> <TextBox Margin="3" Width="100">MyText</TextBox> </StackPanel> ... </StackPanel> This yields the following result: As you can see, the base lines of MyLabel and MyText are not aligned, which looks ugly. Of course, I could start playing around with the margins until they match up, but since this is such a common requirement I'm sure that WPF provides a much easier and more elegant solution, which I just haven't found yet...

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• WPF 4.0 Font Rendering Issue

  - by Tom Allen

  I'm getting a weird rendering issue with WPF 4 applications in the way they render some of the text as it's stretching it and making it very narrow. .net 3.5: .net 4.0: At first I thought it could be a problem with the font, but I'm also seeing the same problem in the Blend 4 beta: I'm running XP SP3, Visual Studio 2010 Professional and everything's as up to date as it can be. I'm not noticing any such problems with Silverlight 4 apps I have built on the same machine... Anyone else seen this or know why it's happening?

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• WPF Statusbar Updates - help, I seem to be going round in circles

  - by David Ward

  I seem to be going round in circles. I have a WPF application that has a main ribbon window with a status bar. When you navigate to a "view" a user control is displayed as the content of the main window. The view has a ViewModel which handles retrieving data from the database and the View's datacontext is set to the ViewModel. What I want is to have the lengthy operation (data retrieval) run on a background thread and whilst it is running the status in the main window to report appropriately. When the background task is complete, the status should revert back to "Ready" (much the same as Visual Studio). How should I wire this together so that I can have the data access code separated out in the ViewModel whilst keeping a responsive UI? I have tried using the BackgroundWorker is various places in the code and I still end up with an unresponsive UI.

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• WPF Border Thickness increase direction

  - by morsanu

  Hey. Another WPF question. In my XAML code I have a border: <Border x:Name="myBorder" Background="AliceBlue" Width="200" Height="200" BorderThickness="10" BorderBrush="Black"> </Border> and somewhere in code I increase the BorderThickness double thickness = myBorder.BorderThickness.Bottom + 2; myBorder.BorderThickness = new Thickness(thickness); and the result is that the border's weight increases but not outside the 200x200 width-height, but inner, decreasing the dimension. Is there a way to do the opposite?

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• Making selectable again a WPF TreeviewITem after the first click

  - by pileggi

  Hi, I have a TreeVIew WPF with 2 Levels of Data. I have deleted the ToogleButton from the TreeViewItemTemplate. Now I'd like to expand / collapse the groups with a single mouse-click (not with a double click as the default behaviour). I have tried in this way: Private Sub tvArt_SelectedItemChanged(ByVal sender As System.Object, _ ByVal e As RoutedPropertyChangedEventArgs(Of System.Object)) Handles tvArt.SelectedItemChanged If e.NewValue Is Nothing = False Then Dim ri As P_RicambiItem = TryCast(e.NewValue, P_RicambiItem) If ri Is Nothing = False Then If ri.isExpanded Then ri.isExpanded = False Else ri.isExpanded = True End If ri.isSelected = False End If End If End Sub Using my properties "isExpanded" and "isSelected" in the collection data source. But it works only halfway: after the first click, infact, I can't click for a second time on the same item, because, even if I've deselected it, the event handler "remembers" that it was the last selected item and it doesn't capture the event "SelectedItemChanged". How can I do? Thanks a lot, Pileggi

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• WPF UC in Winforms occasionally has an odd border to the left / visually corrupted

  - by Ryan ONeill

  I have a WPF user control I created that is used to show the state of tasks in my UI. I get the odd report back that the control sometimes has a nasty looking border to the left and I cannot reproduce it. The control looks like this (when working) (grey tick=not run, green=OK,red cross=fail,hourglass=running); It looks like this when the problem occurs; It may have something to do with the layering of those icons, when the state changes the others are made invisible and the relevant icon is made visible. The four icons are all stacked on top of each other. It could also be the background in theory, which I'll look at next. Problem is reported on both flat panel and CRT displays. Any guidance greatly appreciated. Update: 1) SnapsToDevicePixels does not affect the issue. 2) Grid is not used, only a canvas.

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• WPF Data virtualizing ListView

  - by Robert Jeppesen

  In our current WinForms app, we are displaying millions of records in ListView, using virtualization. Rows are loaded from DB as they are requested. This works well, with good performance. This is a showstopper for migrating to WPF for us. We need data virtualization in a ListView, like WinForms 2.0 has. Do you know a decent third-party control, or a relatively easy way of doing it with built-in controls? It doesn't need to be a DataGrid, a simple ListView will suffice. Note, I'm note talking about UI virtualization, it's data virtualization.

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• Hidden features of WPF and XAML?

  - by Sauron

  Here is a large number of hidden features discussed for variety of languages. Now I am curious about some hidden features of XAML and WPF? One I have found is the header click event of a ListView <ListView x:Name='lv' Height="150" GridViewColumnHeader.Click="GridViewColumnHeaderClickedHandler"> The GridViewColumnHeader.Click property is not listed. Some of relevant features so far: Multibinding combined with StringFormat TargetNullValue to bindings TextTrimming property Markup extensions Adding Aero effect to Window Advanced "caption" properties XAML Converters See also: Hidden features of C# Hidden features of Python Hidden features of ASP.NET Hidden features of Perl Hidden features of Java Hidden features of VB.NET Hidden features of PHP Hidden features of Ruby Hidden features of C And So On........

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• WPF Dragging causes renderer to stop

  - by Cameron MacFarland

  I'm having a problem with my WPF app, where any sort of drag operation stops the UI from updating. The issue seems periodic, as in, the item drags, stops, drags again, stops, etc. in 2 second intervals. It's affecting all controls, including scroll bars. If checked this question as well as this one, and it doesn't seem to be caused by window transparencies. I'm running Win7 x64 with .NET 3.5sp1. Does anyone know what might be causing this, or a way of figuring out what might be causing this?

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• Experiences with UI Automation and WPF

  - by soren.enemaerke

  We are developing a rather large WPF based application and would like to include some automated UI testing in our test suite (which already contains a number of unit tests). The UI Automation Framework from Microsoft partly sounds like a perfect fit for programatically launching and interacting with the application in a test setup. However, I've struggled to find solid references for samples and experiences with the technology, the articles and small samples available on MSDN is not enough to convince me that it is a solid choice. So, does anybody have real world experiences using the UI Automation Framework in their test suite? What are the caveats and the gotchas? Any best practices when written tests scripts, can you "record and replay" to a scriptable format, how much should you facilitate the testing from the application, how did you incorporate it in the automatic build? Should we be looking in another direction than the UI Automation Framework? Feel free to post you experiences here or link to some good references I might have missed

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• How to Filter more than one field using WPF AutoCompleteBox

  - by Drew

  i am trying to customize the suggestions on the AutoCompleteBox in the WPF Tool kit. Right now i have a last name field which when the user enters characters a query runs that retrieves the top 10 records based on that last name. i would also like to filter by first name, i tried splitting out the comma and searching by the last name and the characters entered in the first name. however, as soon as a space or comma is entered into the autocompletebox, the suggest functionality stops working, which I believe is because the ValueMemberPath property is set to be last name. Is there a work around for this, or a way to modify the ValueMemberPath to handle multiple values? Thanks!

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• Resize a WPF window, but maintain proportions?

  - by rathkopf

  I have a user resizable WPF Window that I want to constrain the resizing so the aspect ratio of the window stays constant. Ideally I would like to constrain mouse location when the window is being resized by dragging a corner to positions that maintain the proper aspect ration. If an edge is resized with the mouse, the other dimension should change at the same time. Is there a simple way to do this or a good on-line example that anyone knows of? If no better solutions come up, I'll post what I've done after I've refined it a bit.

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• WPF: isolated storage file path too long

  - by user342961

  Hi, I'm deploying my WPF app with ClickOnce. When developing locally in Visual Studio, I store files in the isolated storage by calling IsolatedStorageFile.GetUserStoreForDomain(). This works just fine and the generated path is C:\Users\Frederik\AppData\Local\IsolatedStorage\phqduaro.crw\hux3pljr.cnx\StrongName.kkulk3wafjkvclxpwvxmpvslqqwckuh0\Publisher.ui0lr4tpq53mz2v2c0uqx21xze0w22gq\Files\FilerefData\-581750116 (189 chars) But when I deploy my app with ClickOnce, the generated path becomes too long, resulting in a DirectoryNotFoundException when creating the isolated storage directory. The generated path with ClickOnce is: C:\Users\Frederik\AppData\Local\Apps\2.0\Data\OQ0LNXJT.R5V\8539ABHC.ODN\exqu..tion_e07264ceafd7486e_0001.0000_b8f01b38216164a0\Data\StrongName.wy0cojdd3mpvq45404l3gxdklugoanvi\Publisher.ui0lr4tpq53mz2v2c0uqx21xze0w22gq\Files\FilerefData\-581750116 (247 chars) When I browse the folders all but the last directory of the path exists. Then when trying to create a folder at this location windows tells me I can't create a directory because the resulting path name will be too long. How can I shorten the path generated by the IsolatedStorage?

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• Appearance of a WPF ListView under Windows Vista and Windows XP is not the same

  - by rem

  In a WPF application I have a ListView: <ListView Name="ItemSelList" ItemsSource="{Binding ItemColl}" SelectionChanged="ItemSelList_SelectionChanged"> <ListView.View> <GridView> <GridViewColumn Header="Date" Width="90" DisplayMemberBinding="{Binding Date}"/> <GridViewColumn Header="Time" Width="90" DisplayMemberBinding="{Binding Time}"/> <GridViewColumn Header="Description" Width="250" DisplayMemberBinding="{Binding Description}"/> </GridView> </ListView.View> </ListView> When running application under Windows Vista, everything is OK. When running under Windows XP - the default font size of ListView's rows is too small and rows of the ListView don't change color when user hovers with a mouse over them. How to do so that ListView appearance under Windows XP is the same as under Vista?

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• .NET WPF Application : Loading a resourced .XPS document

  - by contactmatt

  I'm trying to load a .xps document into a DocumentViewer object in my WPF application. Everything works fine, except when I try loading a resourced .xps document. I am able to load the .xps document fine when using an absolute path, but when I try loading a resourced document it throws a "DirectoryNotFoundException" Here's an example of my code that loads the document. using System.Windows.Xps.Packaging; private void Window_Loaded(object sender, RoutedEventArgs e) { //Absolute Path works (below) //var xpsDocument = new XpsDocument(@"C:\Users\..\Visual Studio 2008\Projects\MyProject\MyProject\Docs\MyDocument.xps", FileAccess.Read); //Resource Path doesn't work (below) var xpsDocument = new XpsDocument(@"\MyProject;component/Docs/Mydocument.xps", FileAccess.Read); DocumentViewer.Document = xpsDocument.GetFixedDocumentSequence(); } When the DirectoryNotFoundException is thrown, it says "Could not find a part of the path : 'C:\MyProject;component\Docs\MyDocument.xps' It appears that it is trying to grab the .xps document from that path, as if it were an actual path on the computer, and not trying to grab from the .xps that is stored as a resource within the application.

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• Use WPF DLL Assembly in ASP.NET problem

  - by liimur

  Hello, I have C++ project that compiles as DLL Assembly in .NET 3.5 SP1 Project is used for Image rendering processing by using WPF (it loads 2 images from local folder, applies one image on another and saves the output file in the same folder). I want to use that that project as a reference in ASP.NET project to the rendering on the website. So I created simple Web Project in ASP.NET C# that uses C++ project as a Reference. Everything works great in ASP.NET Web Development Server (built-in Web server in VS2008). But once I publish this project to IIS on the same Machine or use IIS for debug instead of built-in Web server Image rendering it's not working anymore. I'm not getting any exceptions or error messages, it just output image is not processes as it supposed to be. If anyone know what could cause that I would really appreciate your insight!

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• WPF data grid - Column Header not aligned with data rows

  - by Pawan

  Hi, I am using Datagrid in WPF. This is a very simple and basic implementation. I not using any styles. I created a simple datagrid : <dg:DataGrid x:Name="dg" > </dg:DataGrid> and populated it with data as: dg.ItemsSource = " H E L L O W O R L D!".Split(); Grid gets properly populated but the columnheader of the grid is drawn with some offset. Due to this my data and header are mis aligned. I tried searching for this over net but I haven't found anything. This seems to be a straightforward implementation which is working for everyone except me :(. Can anyone please tell me what might be going wrong? I have tried using different data sets and appyling some style to test this. Thanks in advance.

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• Dropdown menus not showing when i use my wpf application via Remote connections

  - by Bijoy Das Yesudas

  When i connect to my machine using remote desktop the dropdown menus and comboboxes i used in my wpf application is not showing up. And after closing the session when i comes back to my development machine where actually my application runs there also the same issue happens after the remote desktop session. Tried by changing resolution and all sometimes it works but most of the time result is negative. The only temporary solution i found for this is just rebooting the system which is not applicable. Could anyone please help me to fix this issue. Thanks in advance.

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• WPF TextBox Custom Dictionary Support

  - by Tom Allen

  Has anyone found a workaround yet for getting custom dictionary support working for the built in spellchecking on WPF TextBoxes/RichTextBoxes? We've been probing the spelling stuff with reflector hoping to find where the dictionary entries are coming from, but it's looking very much like it's going to be a COM object.... I know it's not currently supported and that Microsoft were looking into supporting it in a future release, but that was quite a while ago and I can't seem to find any recent news about it. Clutching at staws, I've posted a suggestion up on Connect: https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=470233

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• How to Serialize a WPF Drawing?

  - by Néstor Sánchez A.

  Hi, maybe I'm missing something. I believed that WPF vector-based Drawings (like DrawingGroup, DrawingGeometry, etc.) were ready to be serialized. But they are not. So, should I navigate all these drawing childrens, and store they points, lines, brushes (that also are not serializable) and so on, and then made my custom serialization? Is really that difficult or I'm missing something pretty obvious? I mean, even serializing Bitmap images is easy. I thinked serializing vector-based drawings were easier (no quality loss, just descriptive info, no massive data). Thanks for your practical answers, alternate-way suggestions and comments!

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• WPF Standard Commands - Where's Exit?

  - by Andrew Shepherd

  I'm creating a standard menu in my WPF application. I know that I can create custom commands, but I know there are also a bunch of standard commands to bind to. For example, to open a file I should bind to ApplicationCommands.Open, to close a file I should bind to ApplicationCommands.Close. There's also a large number of EditCommands, ComponentCommands or NavigationCommands. There doesn't seem to be an "Exit" command. I would have expected there to be ApplicationCommands.Exit. What should I bind to the "Exit" menu item? To create a custom command for something this generic just seems wrong.

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• WPF Binding Collection To ComboBox and Selecting an item

  - by Adam Driscoll

  I've been knocking my head against this for some time now. I'm not really sure why it isn't working. I'm still pretty new to this whole WPF business. Here's my XAML for the combobox <ComboBox Width="200" SelectedValuePath="Type.FullName" SelectedItem="{Binding Path=Type}" Name="cmoBox" > </ComboBox> Here's what populates the ComboBox (myAssembly is a class I created with a list of possible types) cmoBox.ItemsSource = myAssembly.PossibleTypes; I set the DataContext in a parent element of the ComboBox in the code behind like this: groupBox.DataContext = listBox.SelectedItem; I want the binding to select the correct "possible type" from the combo box. It doesn't select anything. I have tried SelectedValue and SelectedItem. When I changed the DisplayMemberPath of the ComboBox to a different property it changed what was displayed so I know it's not completely broken. Any ideas???

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• WPF Skin Skinning Security Concerns

  - by Erik Philips

  I'm really new to the WPF in the .Net Framework (get that out of the way). I'm writing an application where the interface is very customizable by simply loading .xaml (at the moment a Page element) files into a frame and then mapping the controls via names as needed. The idea is to have a community of people who are interested in making skins, skin my application however they want (much like Winamp). Now the question arises, due to my lack of Xaml knowledge, is it possible to create malicious Xaml pages that when downloaded and used could have other embedded Iframes or other elements that could have embed html or call remote webpages with malicious content? I believe this could be the case. If this is the case then I two options; either I have an automated process that can remove these types of Xaml files by checking it’s elements prior to allowing download (which I would assume would be most difficult) or have a human review them prior to download. Are there alternatives I’m unaware of that could make this whole process a lot easier?

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• Create WPF TextBox that accepts only numbers

  - by Elad

  I would like to create a TextBox that only accepts numeric values, in a specific range. What is the best way to implement such TextBox? I thought about deriving TextBox and to override the validation and coercion of the TextProperty. However, I am not sure how to do this, and I understand that deriving WPF control is generally not recommended. Edit: What I needed was a very basic textbox that filters out all key presses which are not digits. The easiest way to achieve it is to handle the TextBox.PreviewTextInput event: private void textBox_PreviewTextInput(object sender, TextCompositionEventArgs e) { int result; if (!validateStringAsNumber(e.Text,out result,false)) { e.Handled = true; } } (validateStringAsNumber is my function that primarily use Int.TryParse) Some of the suggested solutions are probably better, but for the simple functionality I needed this solution is the easiest and quickest to implement while sufficient for my needs.

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• Run WPF Application from another assembly

  - by Ricibald

  I want to run my wpf application "A" from another assembly "B". I use the following code: static void main() { var app = new A.App(); app.InitializeComponent(); app.Run(); } when i run my app I got the following error: Cannot convert string '/Resources/icon.gif' in attribute 'Icon' to object of type 'System.Windows.Media.ImageSource'. Cannot locate resource 'resources/icon.gif'. Error at object 'MainWindow' in markup file 'A;component/shell/shellview.xaml'. How can I transfer from B images and resources info to A? Thanks!

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