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• Adjust a Control Template and still respect the Theme of the OS?

  - by bitbonk

  In WPF how do I modifiy the template for a standard control in a way that it will respect the current Theme of the Operating System later on? If I just "edit a copy" of the template in blend, it will just give me the template of the currently running theme. Is this correct? So when I apply the modified template and run the app on different themes it will always look the same. For custom controls and even for data templates the problem is similar. How do I provide a template that respects all possible themes of the OS?

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• ClickOnce application configured to perform updates programmatically still sometimes displays the Cl

  - by Tom Hall

  We have a WPF application deployed using ClickOnce which checks for and performs updates programmatically on application startup. This generally behaves perfectly except for the case where the user chooses "No" to our "Do you wish to update?" prompt. In this case, the next time the user launches the application (consistently) the ClickOnce framework's "Update Available" dialog launches with the option to update or skip. This doesn't cause a technical problem but will be confusing to the user to potentially see two completely differently styled dialogs. (If the user chooses Skip to the ClickOnce dialog then the application then launches and renders our own "Update Available" dialog). Any ideas why the ClickOnce framework dialog is showing in this case? Thanks.

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• Using SketchFlow to prototype MS Surface Applications

  - by Isak Savo

  Hi We're doing mockups/prototyping on a MS Surface device and I wonder if anyone has succeeded in using SketchFlow for this. The problem that I see is that the code generated by the tool uses normal WPF controls (Button, etc.) instead of the contact aware surface counterparts (SurfaceButton) which means that they won't work nice on the surface unless you also use a mouse. Additionally, it would be nice if it was possible to hook in to other gesture events to trigger sketchflow transitions. Like the pinch gestures to switch page etc. Has anyone had any success with prototyping for Surface using Sketchflow. If so, how did you do it?

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• DataTemplate, Style, Triggers

  - by plotnick

  Could you guys help me? I have a with custom and in it: <ListBox> <ListBox.ItemTemplate> <DataTemplate> <Border BorderBrush="Black" BorderThickness="2" CornerRadius="5"> <Image Source="{Binding Picture}" /> </Border> </DataTemplate> </ListBox.ItemTemplate> </ListBox> Now when I'm choosing the ListBoxItem it gets ugly with blue colored row selection. I'd like to change it. I want to color only border's background and nothing else. Also I want to change OnMouseOver behavior. I've tried trough triggers, but ContentPresenter doesn't have Background property. help me pls.

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• Change background color of disabled listbox in windows classic theme

  - by Mercury821

  I am developing a WPF application that must run using Windows Classic theme. The application creates a dialog box containing a ListBox. When the dialog box is shown, it must be disabled for 1s before accepting any input. I am accomplishing this with a style trigger, and it works. However, the ListBox shows a white background when it's disabled, which I can't seem to get rid of. When using the aero theme, the following style resource fixes the issue: <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="Transparent"/> But when using Windows Classic theme, the white background reappears. How can i remedy the situation for Classic theme???

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• image and text in listobx

  - by Anu

  I want to inesrt one image beside one text,like this i have to include three items in listbox. in run time. If the number of items is more than 3,then the last items get removed. How can i do that in WPF,C#. And the newly added item should get added in first place. Now i did up to include text at runtime. if (listBox1.Items.Count >= 3) listBox1.Items.RemoveAt(2); listBox1.Items.Insert(0,lData); But i do nto know how to insert image(small rectangle with red colr,green color)

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• What are the real-world benefits of declarative-UI languages such as XAML and QML?

  - by Stu Mackellar

  I'm currently evaluating QtQuick (Qt User Interface Creation Kit) which will be released as part of Qt 4.7. QML is the JavaScript-based declarative language behind QtQuick. It seems to be a very powerful concept, but I'm wondering if anybody that's made extensive use of other, more mature declarative-UI languages like XAML in WPF or Silverlight can give any insight into the real-world benefits that can be gained from this style of programming. Various advantages are often cited: Speed of development Forces separation between presentation and logic Better integration between coders and designers UI changes don't require re-compilation Also, are there any downsides? A few potential areas of concern spring to mind: Execution speed Memory usage Added complexity Are there any other considerations that should be taken into account?

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• Refresh/Reset View

  - by Jay

  Hi, I'm using MVP in WPF and I came across a design doubt and I would to get your opinion on this: At some point I need to refresh my view and perform the same initial queries, like when the view was loading. The view's DataContext is my presenter and I have a couple of collections and other variables that are bound to the view. When I need to refresh the view, I'm clearing the collections and the variables and setting the DataContext to null. After that I fetch new data, populate the collections and set the DataContext. Is this the best way to achieve this? The issue with this, is that i'm affraid that when my app grows bigger I forget to reset some variable...the ideal would be to reload the view again in some way without having to worry with the variables I have. Best regards.

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• ScrollBars are not visible after changing positions of controls inside a Canvas

  - by akjoshi

  Hi, I created a custom canvas control inheriting from WPF Canvas. I am using it like this in main window - <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto"> <RTD:RTDesignerCanvas Margin="5" Background="White" x:Name="canvas1" Focusable="True" AllowDrop="True"> </RTD:RTDesignerCanvas> </ScrollViewer> Everyhting works fine but when I try to set the position of controls inside it like this Canvas.SetTop(item, 200); scrollbars are not visible and control is hiddedn down somewhere. Intrestingly, if I add another control to it scroll bars are visible and I can scroll downwards to see the previous control. I tried to use base.InvalidateVisual(); base.UpdateLayout(); base.InvalidateArrange(); after changing items Top or Left but nothing happens; Am I missing something or this happens due to some bug?

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• Can you update/add records in SQL using a datagridview and LINQ to SQL

  - by Jordan S

  Is it possible to bind a DataGridView to a LINQ to SQL class so that when I make changes to the records in the datagridview it automatically updates the SQL database? I have tried binding the data like this but if I make changes to the data in the datagrid view they do not actually affect the data in the database... BOMClassesDataContext DB = new BOMClassesDataContext(); var mfrs = from m in DB.Manufacturers select m; BindingSource bs = new BindingSource(); bs.DataSource = mfrs; dataGridView1.DataSource = bs;

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• MVVM Light toolkit - maintained? Here today - gone tomorrow? ...

  - by mark smith

  Hi there, I have been taking a look at mvvm light toolkit, i must admit i haven't got a lot of experience with it but i live what i see.. I did use the mvvm toolkit (microsoft) but currently use vs 2010 and no templates are available as yet. I was looking for some insight into mvvm light toolkit... Is it always maintained ? i..e its not going to be gone tomorrow... Or shoudl i be looking elsewhere?? I would really appreciate any feedback... I also saw some info on how it is blendable which the mvvm toolkit (microsoft) didn't seem to have.. Prism also seems to be also a likely candidate but from what i understand its not a MVVM framework / toolkit i would be using it with wpf Any help really appreciated Thank you

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• Batch scripting for directories or better method

  - by baron

  Hi Everyone, Looking at creating a simple batch file for my app. My app needs some directories to be in place as it runs. The first method I thought was just make a batch script: @ECHO OFF IF NOT EXIST C:\App GOTO :CREATE ELSE GOTO :DONTCREATE :CREATE MKDIR C:\App\Code ECHO DIRECTORY CREATED :DONTCREATE ECHO IT WAS ALREADY THERE 1) This doesn't run as I would expect. Both :CREATE and :DONTCREATE seem to run regardless? How do I do an If properly then? Output: A subdirectory or file C:\App\Code already exists. DIRECTORY CREATED IT WAS ALREADY THERE So it enters both true and false statements? 2) The app is a C# WPF app. For what I am trying to do here (create a couple of directories if they don't already exist) - should I do it some other way? Perhaps in the application as it runs?

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• How to implement an override method in IronPython

  - by Adal

  I'm trying to implement a WPF control in IronPython and I'm having trouble implemented the override methods. The code below fails with this error: TypeError: expected int, got instancemethod. If I rename the VisualChildrenCount method, the exception is not raised anymore, but the control doesn't work. So how do I tell IronPython that the method is an override? class PaintCanvas(FrameworkElement): def __init__(self): self.__children = VisualCollection(self) dv = DrawingVisual() self.__children.Add(dv) # In C# this should be: protected override int VisualChildrenCount def VisualChildrenCount(self): return self.__children.Count # In C# this should be: protected override Visual GetVisualChild(int index) def GetVisualChild(self, index): return self.__children[index]

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• DateTime Property not firing PropertyChanged event when changed

  - by Brent

  I'm working on a WPF MVVM application and I've got a TextBox on my view that is bound to a DateTime property on the ViewModel. Seems simple enough, but when I clear the text in the TextBox, the property never changes. In fact, it never even fires until I begin typing "4/1..." and then it fires. What can I do to fix this? Obviously I could bind the TextBox to a string property and then update the real property in the setter, but that's a bit of a hack. There's got to be a better way... ViewModel private DateTime _startDate; public DateTime StartDate { get { return _startDate; } set { _startDate = value; OnPropertyChanged("StartDate"); } } View <TextBox Text="{Binding Path=StartDate, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=true}"/>

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• YesNo MessageBox not closing when x-button clicked

  - by Simpzon

  When I open a MessageBox with options YesNo, the (usually) cancelling cross in the upper right is shown but has no effect. System.Windows.MessageBox.Show("Really, really?", "Are you sure?", MessageBoxButton.YesNo); If I offer YesNoCancel as options, clicking the cross closes the Dialog with DialogResult Cancel. System.Windows.MessageBox.Show("Really, really?", "Are you sure?", MessageBoxButton.YesNoCancel); I would have expected that the cross is "looking disabled" if not hidden at all, when clicking it has no effect. Probably I am not the first one observing this. What is your favorite way to hide/disable this button or workaround the issue? Note: I would prefer a solution that does not use System.Windows.Forms, since I am dealing with WPF projects and would like to avoid any InterOp if possible.

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• SelectedIndex of combobox not updating correctly using databinding.

  - by Matthijs Wessels

  I have a ComboBox: <ComboBox Name="iComponentFieldComboBox" SelectedIndex="{Binding ComponentFieldSelectedIndex, Mode=TwoWay}" Height="23" Margin="132,0,280,38" VerticalAlignment="Bottom"> <ComboBoxItem Name="item1">item1</ComboBoxItem> <ComboBoxItem Name="item2">item2</ComboBoxItem> <ComboBoxItem Name="item3">item3</ComboBoxItem> </ComboBox> When I start my WPF and set the ComponentFieldSelectedIndex property of my ViewModel in my code, nothing happens. But after I have selected an item in the combobox, then suddenly setting ComponentFieldSelectedIndex does work. for example: start app. click button that sets ComponentFieldSelectedIndex to 1. selected item doesn't change to item2. select item3 in combo box. click button that sets ComponentFieldSelectedIndex to 1. selected item does change to item2. Does anyone have an idea what could be causing this?

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• Transpose a Collection

  - by Joseph Melettukunnel

  Hello, I've a list of different sizes of a T-Shirt, e.g. S, M, L. Since this might change for T-Shirts (sometimes we just have e.g. M, L), we load this into a List sizes. Since most DataGrids (xamDataGrid, WPF Toolkit DataGrid) need Properties for binding to the Columns, I'd like to transpose somehow my data. Does anyone have an idea how to do this? E.g. Instead of having List where Size { string sizeName, int available, int defect, int ordered} Avail. Defect Ordered [S] 1 2 3 [M] 1 2 3 [L] 1 2 3 I want an Object which has the Properties S, M, L containing the Values like this: [S] [M] [L] Avail. 1 2 3 Defect 1 2 3 Ordered 1 2 3 The problem here is that I don't know how many sizes will be available for the tshirt, it might be 3, 4, or 10. Thanks for any help Cheers PS: Here is a mockup of how the final grid should look like http://img39.imageshack.us/img39/9161/multirowspangridfixedel.png

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• How apply a storyboard to a Label programmatically ?

  - by ThitoO

  Hi :), I've a little problem, I'd search google and my Wpf's books but I don't found any answer :( I have created a little storyboard : <Storyboard x:Key="whiteAnim" Duration="1"> <ColorAnimation By="Black" To="White" Storyboard.TargetProperty="Background" x:Name="step1"/> <ColorAnimation By="White" To="Black" Storyboard.TargetProperty="Background" x:Name="step2"/> </Storyboard> This animation will change background color from black to white, and from white to black. I want to "apply" this storyboard to a Label : Label label = new Label(); label.Content = "My label"; I'm looking for a method like "label.StartStoryboard(--myStoryboard--), do you have any ideas ? Thank you :)

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• Graphical net and text

  - by chesheerkys

  Hello! My task is to make a control, that behaves itself like RichTextBox, but contains a graphical net. The only task, this net is solving, is to be visible. It should be solution in overriding OnPaint method, but it doesn't. This code: protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) { base.OnPaint(e); ...//drawing a line } gives me RichTextBox without of text This code: protected override void WndProc(ref System.Windows.Forms.Message m) { base.WndProc(ref m); if (m.Msg == 15) { Graphics g = this.CreateGraphics(); g.DrawLine(new Pen(Color.White, 1), new Point(0, 0), new Point(400, 400)); } } sometimes draws extra lines Actually since these two ways don't work, I don't know what to try. Waiting for your advices :) BR Dmitry P.S. I’ve heard a lot about great opportunities of WPF, but I’m not really common with this technology and don’t know what to start with. P.P.S. Sorry for my English, it’s not my natural language.

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• How to set Height of items in XAML so they always occupy the same proportion of available space in p

  - by aoven

  I have an ItemsControl with the following ItemTemplate: <DataTemplate x:Key="myItemTemplate"> <TextBlock Height="???" Text="{Binding Path=Description}" /> </DataTemplate> My question is, how do I set the Height of the TextBlock in the template so that it automatically assumes ItemsControl.Height div ItemsCount amount of vertical space? When there's only one item, I'd like it to be the full height of container, when there're two, each should be half the size, and so on. If possible, I'd prefer to do this completely in XAML to keep my ViewModel clean of UI logic.

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• Detecting a Key Press Squashed by Another Application

  - by Eric Smith

  I have a WPF application I'm planning to use as an overlay for a DirectX game (specifically Bad Company 2). I'm using WM_KEYBOARD_LL hook to detect KeyDown events so I can bring my app to the foreground when a specific button is pressed. This works perfectly except for when the game is running (I've also noticed this problem with Window's "Chess Titans" so it may be a DirectX thing). As far as I can work out, when the game detects a keyboard press, it "eats" the event and doesn't pass the CallNextHookEx() method like it should, which would allow the key press message to be moved along to the next application in the queue. I'm wondering if there's any sort of work-around to this? It seems kind of unfair that a single application can just willy-nilly eat up messages like that. Thanks! :) Relevant MSDN documentation: http://msdn.microsoft.com/en-us/library/ms644985%28VS.85%29.aspx

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• Why use MVVM???

  - by LnDCobra

  Okay, I have been looking into MVVM pattern, and each time I have previously tried looking into it, I gave up for a number of reasons: Unnecessary Extra Long Winded Coding No apparent advantages for coders (no designers in my office. Currently only myself soon to be another coder) Not a lot of resources/documentation of good practices! (Or at least hard to find) Cannot think of a single scenario where this is advantageous. I'm about to give up on it yet again, and thought I'd ask to see if someone answer the reasons above. I honestly can't see an advantage of using this for a single/partner coding. Even in complex projects with 10's of windows. To me the DataSet is a good enough view and binding like in the answer by Brent following question

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• Is using value converters to generate GUI-friendly strings a misuse of value converters?

  - by tempy

  Currently, I use value converters to generate user-friendly strings for the GUI. As an example, I have a window that displays the number of available entities in the status bar. The Viewmodel simply has an int dependency property that the calling code can set, and then on the binding for the textbox that displays the number of entities, I specify the int dependency property and a value converter that changes "x" into "x entities available". My code is starting to become littered with these converters, and I have a large number of annoying resource declarations in my XAML, and yet I like them because all the GUI-specific string formatting is being isolated in the converters and the calling code doesn't have to worry about it. But still, I wonder if this is not the purpose that value converters were made for.

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• Dynamic size canvas with Scroll bars

  - by Pawan

  Hi, I am developing a simple WPF application without any auto layout. The goal is when a user clicks (mouse down) a element (say textBlock) will appear at the location of the mouse click. For this I am using canvas panel embedded in a Grid of 1 row, 1 column and scrollviewer (visible). The issues are: 1. when the application window is resized the scroll viewers do not become active. 2. I want the ability to auto grow the canvas with mouse drag. Something like in MS-Excel when user drags the mouse horizontally/vertically the canvas should grow. I have searched net a lot to figure this out and am unable to get an answer. Any help in this regard would be great. Thanks a bunch in advance. -P

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• Image Viewer application, Image processing with Display Data.

  - by Harsha

  Hello All, I am working on Image Viewer application and planning to build in WPF. My Image size are usually larger than 3000x3500. After searching for week, I got sample code from MSDN. But it is written in ATL COM. So I am planning to work and build the Image viewer as follows: After reading the Image I will scale down to my viewer size, viwer is around 1000x1000. Lets call this Image Data as Display Data. Once displaying this data, I will work only this Display data. For all Image processing operation, I will use this display data and when user choose to save the image, I will apply all the operation to original Image data. My question is, Is is ok to use Display data for showing and initial image processing operations.

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