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  • How to Clear an image control in WPF (C#)

    - by antongladchenko
    I have an image control with a source image located in my c drive. I get a message that the image is being used by another process whenever I try to delete the original image to change it with another one dynamically. How do I release the image from the image control to be able to delete it. I tried this variants: string path = ((BitmapImage)img.Source).UriSource.LocalPath; img.SetValue(System.Windows.Controls.Image.SourceProperty, null); File.Delete(path); And: string path = ((BitmapImage)img.Source).UriSource.LocalPath; img.Source = null; File.Delete(path) But it's not work...

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  • How to invoke WPF Dispatcher in Nunit?

    - by Reporting Avatar
    I want to test an application which renders a text block with a data field value. I would like to get the actual width and actual height, once the rendering completes. Everything works fine. The problem came first, when I tried to test the application. I'm unable to invoke the dispatcher from the test project. Following is the code. this.Loaded += (s, e) => { TextBlock textBlock1 = new TextBlock(); //// Text block value is assigned from data base field. textBlock1.Text = strValueFromDataBaseField; //// Setting the wrap behavior. textBlock1.TextWrapping = TextWrapping.WrapWithOverflow; //// Adding the text block to the layout canvas. this.layoutCanvas.Children.Add(textBlock1); this.Dispatcher.BeginInvoke(DispatcherPriority.Background, (Action)(() => { //// After rendering the text block with the data base field value. Measuring the actual width and height. this.TextBlockActualWidth = textBlock1.ActualWidth; this.TextBlockActualHeight = textBlock1.ActualHeight; //// Other calculations based on the actual widht and actual height. } )); }; I've just started using the NUnit. So, please help me. Thanks

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  • WPF Window Drag/Move Boundary

    - by Sentax
    Hi everyone, just curious if you know of any way to setup a drag boundary for a window? It would be nice to have these properties: Me.MinLeft = 10 Me.MinTop = 10 Me.MaxLeft = 150 Me.MaxTop = 150 Those are made up properties, btw, which would be nice to have. I know I could probably setup a timer to fire ever 10th of a second and check the left and top and then move it back if it's over. But it would be more elegant to have the window act like it hit a wall and can't go any farther, like moving to the edge of the screen or something similar. Edit: There seems to be some confusion somewhere, the point I'm trying to make is in the paragraph above, dragging, not re-sizing.

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  • WPF TextBox trigger to clear Text

    - by PaN1C_Showt1Me
    Hi ! I have many TextBox controls and I'm trying to write a style that clears the Text property when the Control is disabled. I don't want to have Event Handlers in code behind. I wrote this: <Style TargetType="{x:Type TextBox}"> <Style.Triggers> <Trigger Property="IsEnabled" Value="False"> <Setter Property="Text" Value="{x:Null}" /> </Trigger> </Style.Triggers> </Style> The problem is that if the TextBox is defined like: <TextBox Text={Binding Whatever} /> then the trigger does not work (probably because it's bound) How to overcome this problem?

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  • get absolute file path from image in WPF

    - by melculetz
    I have something like this in my xaml: <Grid> <Image Name="image" Source="../../Images/DefaultImage.png" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"></Image> </Grid> How can I get (using my code-behind c# code) the absolute path of the image source?

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  • WPF Navigation Page Breadcrumb

    - by Ryan
    I found code to use a breadcrumb instead of the navigation buttons for my pages. This code works perfect with setting a page as the startup. My problem is that I need to have a window with a frame control as the startup and this is causing the breadcrumb to not show at all. I seem to be missing something with my styling. The types used to be NavigationWindow but I changed them to Frame to try and get a working solution. <Style TargetType="Frame" x:Key="{x:Type Frame}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="Frame"> <Grid Background="Transparent"> <Grid.RowDefinitions> <RowDefinition Height="50"/> <RowDefinition Height="50"/> <RowDefinition Height="*"/> </Grid.RowDefinitions> <ItemsControl ItemsSource="{Binding RelativeSource={RelativeSource AncestorType={x:Type Frame}}, Path=BackStack}"> <!--Force the ItemsContol to use a wrap panel as Items host--> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <local:InverseWrapPanel KeyboardNavigation.TabNavigation="Cycle" KeyboardNavigation.DirectionalNavigation="Cycle"/> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> <ItemsControl.ItemTemplate> <DataTemplate> <Button Command="NavigationCommands.NavigateJournal" CommandParameter="{Binding RelativeSource={RelativeSource Self}}" Content="{Binding Name}"> <Button.Template> <ControlTemplate TargetType="Button"> <WrapPanel> <TextBlock Name="text1" FontWeight="Bold" Text="{TemplateBinding Content}"/> <TextBlock Name="text2" FontWeight="Bold" Text=">>" Margin="2,0,0,0"/> </WrapPanel> <ControlTemplate.Triggers> <Trigger Property="IsMouseOver" Value="True"> <Setter TargetName="text1" Property="Foreground" Value="Blue"/> <Setter TargetName="text2" Property="Foreground" Value="Blue"/> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Button.Template> </Button> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> <AdornerDecorator Grid.Row="2"> <ContentPresenter Name="PART_NavWinCP" ClipToBounds="true"/> </AdornerDecorator> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style>

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  • How to use a derived ControlTemplate in WPF

    - by Frank Fella
    The following xaml code works: <Window x:Class="DerivedTemplateBug.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:DerivedTemplateBug" Title="Window1" Height="300" Width="300"> <Button> <Button.Template> <ControlTemplate> <Border BorderBrush="Black" BorderThickness="2"> <TextBlock>Testing!</TextBlock> </Border> </ControlTemplate> </Button.Template> </Button> </Window> Now, if you define the following data template: using System.Windows.Controls; namespace DerivedTemplateBug { public class DerivedTemplate : ControlTemplate { } } And then swap the ControlTemplate for the derived class: <Window x:Class="DerivedTemplateBug.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:DerivedTemplateBug" Title="Window1" Height="300" Width="300"> <Button> <Button.Template> <local:DerivedTemplate> <Border BorderBrush="Black" BorderThickness="2"> <TextBlock>Testing!</TextBlock> </Border> </local:DerivedTemplate> </Button.Template> </Button> </Window> You get the following error: Invalid ContentPropertyAttribute on type 'DerivedTemplateBug.DerivedTemplate', property 'Content' not found. Can anyone tell my why this is the case?

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  • WPF - Render text in Viewport3D

    - by eWolf
    I want to present up to 300 strings (just a few words) in a Viewport3D - fast! I want to render them on different Z positions and zoom in and out fluently. The ways I have found so far to render text in a Viewport3D: Put a TextBlock in a Viewport2DVisual3D. This guy's PlanarText class. The same guy's SolidText class. Create my own 2D panel and align TextBlocks on it. Call InvalidateArrange() every time I update the camera position. All of these are extremely slow and far apart from zooming fluently even with 10 strings only. Does anyone have a solution for this handy? It's got to be possible to render some text in a Viewport3D without waiting seconds!

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  • wpf cancel backgroundworker on application exits

    - by toni
    Hi! In my application I have a main windows and into it, in a frame I load a page. This page do a long time task when the user press a button. My problem is that when long task is being doing and the user presses the close button of the main window, the application seems to not finish because I am debugging it in VS2008 and I can see the stop button highlighted. If I want to finish I have to press stop button, the application doesn't stop the debugging automatically on application exit. I thought .NET stops automatically backgroundworkers on application exits but I am not sure after seeing this behaviour. I have tried to force and cancel background worker in unloaded event page with something like this: private void Page_Unloaded(object sender, RoutedEventArgs e) { // Is the Background Worker do some work? if (My_BgWorker != null && My_BgWorker.IsBusy) { //If it supports cancellation, Cancel It if (My_BgWorker.WorkerSupportsCancellation) { // Tell the Background Worker to stop working. My_BgWorker.CancelAsync(); } } } but with no success. After doing CancelAsync(), a few minutes after, I can see the backgroundworker finishes and raise RunWorkerCompleted and I can see the task is completed checking e.Cancelled argument in the event but after this event is exectued the application continues without exiting and I have no idea what is doing.... I set WorkerSupportsCancellation to true to support cancel at the begining. I would apreciate all answers. Thanks.

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  • WPF ControlTemplate vs UserControl

    - by PaN1C_Showt1Me
    Hi. I've recently made an UserControl, which took quite a long time, because I had to work with custom Dependency Properties and so on... Anyways, it was just a bunch of 3 controls: TextBox, Popup with Hierarchical Tree. Now I realized I could probably write a ControlTemplate only. Hence what is the benefit of using UserControl?

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  • WPF TextBox DataBind on EnterKey press

    - by Jobi Joy
    The default DataBinding on TextBox is TwoWay and it commits the text to the Property only when TextBox lost its focus. Is there any easy XAML way exists to make the DataBinding Happens when I press Enter Key on the TextBox?. I know it is pretty easy to do in the code behind, but imagine if this textBox is inside some complex DataTemplate.

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  • WPF creating custom control - creating control like SpinBox extending TextBox

    - by veedoo
    Hi, What is the best way to extend a control? Lets choose for example SpinBox - we want to extend TextBox to SpinBox - just to add two buttons on the right side, which each one on click checks if Text property is a valid number and if it is increases or decreases the value by 1. Suposse that we have a lot of code using TextBox (Text, IsReadOnly properties and bindings etc.) so we want to replace TextBox by SpinBox without touching rest of the code. 1) we can inherit TextBox - so we have exactly the same interface, but how to add the buttons ?? 2) we can inherit from some layout control - eg. DockPanel - we can add buttons, but we lose TextBox interface. 3) after quick read about ControlTemplates I'm not sure, but I believe that we can add buttons and their logic using ControlTemplates 4) like about templates I'm not sure, but I hope we can inherit decorator class to create decorator with the buttons - we lose interface, but can add TextBox as a child I think that the best solutions is to combine 3) and 4) - create a decorator class and use it in a control template for TextBox. I would be grateful for your ideas and simple code how to implement 3 and 4, especially with code (c#), not xaml. Regards

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  • WPF Expander Button Styled so it is inside Expander Header

    - by Burt
    I am using the expander control and have styled the header as shown in the picture below. The problem I have is that I want the expander button to be contained within the header so that the line for the end of the header template aligns with the Expander content i.e. I ultimatly want to end up with something similar to the image below. Thanks in advance.

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  • Problem with Popup.StaysOpen in WPF

    - by Tola Ch.
    I got my UserControl that contain: Button Popup (contain Text block) XAML <UserControl> <button Name="btnShowPopup" Content="Button" Click="Button_Click"/> <Popup Name="popup" StaysOpen="true"> <TextBlock Text="Popup"/> </Popup> </UserControl> Code Behide private void Button_Click(object sender, System.Windows.RoutedEventArgs e) { this.popup.IsOpen=!this.popup.IsOpen; } QUESTION: I want to hide the popup, when mouse click on anywhere outside the btnShowPopup button. NOTE: I tried change StaysOpen="false" and when btnShowPopup.MouseDown event: this.popup.IsOpen=!this.popup.IsOpen; But this solution cause another problem: when btnShowPopup.MouseUp event, the Popup is disappear. Please help.

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  • wpf binding by selected value - swap out bound object without disturbing binding

    - by Andy Clarke
    Hi, I've got combo box bound to a custom collection type - its basically an overridden ObservableCollection which I've added a facility to update the underlying collection (via Unity). I don't want to confuse the issue too much, but thats the background. My xaml looks like this <ComboBox ItemsSource="{Binding Manufacturers}" DisplayMemberPath="Name" SelectedValuePath="ID" SelectedValue="{Binding Vehicle.ManufacturerID}" /> And in my overridden collection i was doing this. index = IndexOf(oldItem); Insert(index, (T)newItem); RemoveAt(index + 1); I had hoped because it was bound by value, that inserting the new object(which had the same id) and then removing the old one would work. But it seems that although its bound by SelectedValue it still knows that its being swapped for a different one. The combo just looses its selection. Can anyone help please?

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  • WPF Resource Dictionary in a separate assembly

    - by Gustavo Cavalcanti
    I have resource dictionary files (MenuTemplate.xaml, ButtonTemplate.xaml, etc) that I want to use in multiple separate applications. I could add them to the applications' assemblies, but it's better if I compile these resources in one single assembly and have my applications reference it, right? After the resource assembly is built, how can I reference it in the App.xaml of my applications? Currently I use ResourceDictionary.MergedDictionaries to merge the individual dictionary files. If I have them in an assembly, how can I reference them in xaml? Thanks for your help! Gustavo

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  • Is it possible to seletively color a wrapping TextBlock in Silverlight/WPF

    - by joemoe
    For instance, if I have a TextBlock: "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum." I want the first 10% of this TextBlock, such that the font color should be red, and the rest should be green. This perhaps means it would color the "Lorem ipsum dolor sit amet, consectetur adipisici", and part of the "n". Basically pixel-wise font coloring instead of character-wise. Another important behavior is that the percentage respects the wrapping, in that if 50% of the TextBlock contents is colored, it should mean 50% of the text in reading order is colored, and not the first half of the block. For example, this is a similar question (with correct answers), but regarding Label/TextBlocks with no wrapping: http://stackoverflow.com/questions/2394421/is-it-possible-to-seletively-color-a-label-in-silverlight

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  • WPF DataGrid HeaderTemplate Mysterious Padding

    - by Jake Wharton
    I am placing a single button with an image in the header of a column of a DataGrid. The cell template is also just a simple button with an image. <my:DataGridTemplateColumn> <my:DataGridTemplateColumn.HeaderTemplate> <DataTemplate> <Button ToolTip="Add New Template" Name="AddNewTemplate" Click="AddNewTemplate_Click"> <Image Source="../Resources/add.png"/> </Button> </DataTemplate> </my:DataGridTemplateColumn.HeaderTemplate> <my:DataGridTemplateColumn.CellTemplate> <DataTemplate> <Button ToolTip="Edit Template" Name="EditTemplate" Click="EditTemplate_Click" Tag="{Binding}"> <Image Source="../Resources/pencil.png"/> </Button> </DataTemplate> </my:DataGridTemplateColumn.CellTemplate> </my:DataGridTemplateColumn> When rendered, the header has approximately 10-15px of padding on the right side only which causes the cells to obviously render at that width leaving the cell button having empty space on both sides. Being a pixel-perfectionist this annoys the hell out of me. I had initially thought that it was space for the arrows displayed when sorted but I have sorting disabled on both the entire DataGrid and explicitly on the column. Here's a image: I assume this is padding form whatever is the parent element of the button. Does anyone know a way to eliminate it?

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  • MVVM/WPF: DataTemplate is not changed in Wizard

    - by msfanboy
    Hello, I wonder why my contentcontrol(headeredcontentcontrol) does not change the datatemplates when I press the previous/next button. While debugging everything seems ok means I jump forth and back the collection of wizardpages but always the first page is shown and its header text not the usercontrol is visible. What do I have forgotten? using System; using System.Collections.Generic; using System.Linq; using System.Text; using GalaSoft.MvvmLight.Command; using System.Collections.ObjectModel; using System.Diagnostics; using System.ComponentModel; namespace TBM.ViewModel { public class WizardMainViewModel { WizardPageViewModelBase _currentPage; ReadOnlyCollection _pages; RelayCommand _moveNextCommand; RelayCommand _movePreviousCommand; public WizardMainViewModel() { this.CurrentPage = this.Pages[0]; } public RelayCommand MoveNextCommand { get { return _moveNextCommand ?? (_moveNextCommand = new RelayCommand(() => this.MoveToNextPage(), () => this.CanMoveToNextPage)); } } public RelayCommand MovePreviousCommand { get { return _movePreviousCommand ?? (_movePreviousCommand = new RelayCommand( () => this.MoveToPreviousPage(), () => this.CanMoveToPreviousPage)); } } bool CanMoveToPreviousPage { get { return 0 < this.CurrentPageIndex; } } bool CanMoveToNextPage { get { return this.CurrentPage != null && this.CurrentPage.IsValid(); } } void MoveToPreviousPage() { this.CurrentPage = this.Pages[this.CurrentPageIndex - 1]; } void MoveToNextPage() { if (this.CurrentPageIndex < this.Pages.Count - 1) this.CurrentPage = this.Pages[this.CurrentPageIndex + 1]; } /// <summary> /// Returns the page ViewModel that the user is currently viewing. /// </summary> public WizardPageViewModelBase CurrentPage { get { return _currentPage; } private set { if (value == _currentPage) return; if (_currentPage != null) _currentPage.IsCurrentPage = false; _currentPage = value; if (_currentPage != null) _currentPage.IsCurrentPage = true; this.OnPropertyChanged("CurrentPage"); this.OnPropertyChanged("IsOnLastPage"); } } public bool IsOnLastPage { get { return this.CurrentPageIndex == this.Pages.Count - 1; } } /// <summary> /// Returns a read-only collection of all page ViewModels. /// </summary> public ReadOnlyCollection<WizardPageViewModelBase> Pages { get { return _pages ?? CreatePages(); } } ReadOnlyCollection<WizardPageViewModelBase> CreatePages() { WizardPageViewModelBase welcomePage = new WizardWelcomePageViewModel(); WizardPageViewModelBase schoolclassPage = new WizardSchoolclassSubjectPageViewModel(); WizardPageViewModelBase lessonPage = new WizardLessonTimesPageViewModel(); WizardPageViewModelBase timetablePage = new WizardTimeTablePageViewModel(); WizardPageViewModelBase finishPage = new WizardFinishPageViewModel(); var pages = new List<WizardPageViewModelBase>(); pages.Add(welcomePage); pages.Add(schoolclassPage); pages.Add(lessonPage); pages.Add(timetablePage); pages.Add(finishPage); return _pages = new ReadOnlyCollection<WizardPageViewModelBase>(pages); } int CurrentPageIndex { get { if (this.CurrentPage == null) { Debug.Fail("Why is the current page null?"); return -1; } return this.Pages.IndexOf(this.CurrentPage); } } public event PropertyChangedEventHandler PropertyChanged; void OnPropertyChanged(string propertyName) { PropertyChangedEventHandler handler = this.PropertyChanged; if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName)); } } } <UserControl x:Class="TBM.View.WizardMainView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:ViewModel="clr-namespace:TBM.ViewModel" xmlns:View="clr-namespace:TBM.View" mc:Ignorable="d" > <UserControl.Resources> <DataTemplate DataType="{x:Type ViewModel:WizardWelcomePageViewModel}"> <View:WizardWelcomePageView /> </DataTemplate> <DataTemplate DataType="{x:Type ViewModel:WizardSchoolclassSubjectPageViewModel}"> <View:WizardSchoolclassSubjectPageView /> </DataTemplate> <DataTemplate DataType="{x:Type ViewModel:WizardLessonTimesPageViewModel}"> <View:WizardLessonTimesPageView /> </DataTemplate> <DataTemplate DataType="{x:Type ViewModel:WizardTimeTablePageViewModel}"> <View:WizardTimeTablePageView /> </DataTemplate> <DataTemplate DataType="{x:Type ViewModel:WizardFinishPageViewModel}"> <View:WizardFinishPageView /> </DataTemplate> <!-- This Style inherits from the Button style seen above. --> <Style BasedOn="{StaticResource {x:Type Button}}" TargetType="{x:Type Button}" x:Key="moveNextButtonStyle"> <Setter Property="Content" Value="Next" /> <Style.Triggers> <DataTrigger Binding="{Binding Path=IsOnLastPage}" Value="True"> <Setter Property="Content" Value="Finish}" /> </DataTrigger> </Style.Triggers> </Style> <ViewModel:WizardMainViewModel x:Key="WizardMainViewModelID" /> </UserControl.Resources> <Grid DataContext="{Binding ., Source={StaticResource WizardMainViewModelID}}" > <Grid.RowDefinitions> <RowDefinition Height="310*" /> <RowDefinition Height="51*" /> </Grid.RowDefinitions> <!-- CONTENT --> <Grid Grid.Row="0" Background="LightGoldenrodYellow"> <HeaderedContentControl Content="{Binding CurrentPage}" Header="{Binding Path=CurrentPage.DisplayName}" /> </Grid> <!-- NAVIGATION BUTTONS --> <Grid Grid.Row="1" Background="Aquamarine"> <StackPanel HorizontalAlignment="Center" Orientation="Horizontal"> <Button Command="{Binding MovePreviousCommand}" Content="Previous" /> <Button Command="{Binding MoveNextCommand}" Style="{StaticResource moveNextButtonStyle}" Content="Next" /> <Button Command="{Binding CancelCommand}" Content="Cancel" /> </StackPanel> </Grid> </Grid>

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  • WPF ToolTip Style with dynamic LayoutTransform

    - by NoOne
    I have an app that scales it's UI and I want to scale the ToolTips with it. I have tried doing this: <Style TargetType="{x:Type ToolTip}"> <Setter Property="LayoutTransform" Value="{DynamicResource scaleTransf}"/> ... </Style> ...where scaleTransf is a resource that I change via code: Application.Current.Resources["scaleTransf"] = new ScaleTransform(...); Most of the ToolTips do get scaled in size but some of them that are created by C# code don't get scaled. I've checked and it seems that I don't set their Style or LayoutTransform by code, so I don't really understand what is going wrong... Moreover, I have the impression that the above XAML code worked fine a few days ago. :( Is there sth I can do to make it work all the time without setting the LayoutTransform in code-behind? EDIT : The ToolTips that don't change scale are the ones that have become visible before. EDIT2 : Extra code: <ScaleTransform x:Key="scaleTransf" ScaleX="1" ScaleY="1"/> I have also tried this: Application.Current.Resources.Remove("scaleTransf"); Application.Current.Resources.Add("scaleTransf", new ScaleTransform(val, val)); EDIT3 : My attempt to solve this using a DependencyProperty: In MainWindow.xaml.cs : public static readonly DependencyProperty TransformToApplyProperty = DependencyProperty.Register("TransformToApply", typeof(Transform), typeof(MainWindow)); public Transform TransformToApply { get { return (Transform)this.GetValue(TransformToApplyProperty); } } Somewhere in MainWindow, in response to a user input: this.SetValue(TransformToApplyProperty, new ScaleTransform(val, val)); XAML Style: <Style TargetType="{x:Type ToolTip}"> <Setter Property="LayoutTransform" Value="{Binding TransformToApply, ElementName=MainWindow}"/> ... Using this code, not a single one of the ToolTips seem to scale accordingly.

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  • WPF Dispatcher.UnhandledException within a ShowDialog call.

    - by Eric
    It appears that ShowDialog() invokes the Dispatcher message handling loop within. Thus, you have a stack that looks something like: Outer-most Dispatcher message loop ... x.ShowDialog() Inner Dispatcher message loop ... I am using the Dispatcher.UnhandledException to catch exceptions not handled by my code. However, it appears that the Inner Dispatcher message loop, above, is undesirably catching exceptions that my code would catch. Example: Outer-most Dispatcher message loop try/catch FooException ... x.ShowDialog() Inner Dispatcher message loop ... throw FooException What I would like is for the thrown FooException to get caught by the try/catch. However. It gets caught first by the (inner) Dispatcher.UnhandledException. I see there are ways to filter the exception. However, those filters will apply to both the inner and outer most handlers. What I am looking for is to have my Dispatcher.UnhandledException code run only on the outer-most dispatcher message loop. Does that make sense? I could, of course, reflect the call stack from within my handler to see if this is the outer-most dispatcher, but that seems a bit fragile. Other ideas? Thanks! Eric

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  • C# WPF XAML binding to DataTable

    - by LnDCobra
    I have the following tables: Company {CompanyID, CompanyName} Deal {CompanyID, Value} And I have a listbox: <ListBox Name="Deals" Height="100" Width="420" Margin="0,20,0,0" HorizontalAlignment="Left" VerticalAlignment="Top" Visibility="Visible" IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding}" SelectionChanged="Deals_SelectionChanged"> <ListBox.ItemTemplate> <DataTemplate> <StackPanel Orientation="Horizontal"> <TextBlock Text="{Binding companyRowByBuyFromCompanyFK.CompanyName}" FontWeight="Bold" /> <TextBlock Text=" -> TGS -> " /> <TextBlock Text="{Binding BuyFrom}" FontWeight="Bold" /> </StackPanel> </DataTemplate> </ListBox.ItemTemplate> </ListBox> As you can see, I want to display the CompanyName rather then the ID which is a foreign Key. The relation "companyRowByBuyFromCompanyFK" exists, as in Deals_SelectionChanged I can access companyRowByBuyFromCompanyFK property of the Deals row, and I also can access the CompanyName propert of that row. Is the reason why this is not working because XAML binding uses the [] indexer? Rather than properties on the CompanyRows in my DataTable? At the moment im getting values such as - TGS - 3 - TGS - 4 What would be the best way to accomplish this? Make a converter to convert foreign keys using Table being referenced as custom parameter. Create Table View for each table? This would be long winded as I have quite a large number of tables that have foreign keys.

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  • WPF ListView groups repeat column headers

    - by Riko
    Is there a way to repeat the column headers inside each group of a ListView.GridView when using a grouped CollectionViewSource as the source of the ListView? I am using the example at http://msdn.microsoft.com/en-us/library/ms754027.aspx which uses an Expander control to display each group. I would like the column headers to appear inside the expander for each group instead of at the top of the ListView.

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  • Why isn't TextBox.Text in WPF animatable?

    - by cplotts
    Ok, I have just run into something that is really catching me off-guard. I was helping a fellow developer with a couple of unrelated questions and in his project he was animating text into some TextBlock(s). So, I went back to my desk and recreated the project (in order to answer his questions), but I accidentally used TextBox instead of TextBlock. My text wasn't animating at all! (A lot of help, I was!) Eventually, I figured out that his xaml was using TextBlock and mine was using TextBox. What is interesting, is that Blend wasn't creating key frames when I was using TextBox. So, I got it to work in Blend using TextBlock(s) and then modified the xaml by hand, converting the TextBlock(s) into TextBox(es). When I ran the project, I got the following error: InvalidOperationException: '(0)' Storyboard.TargetProperty path contains nonanimatable property 'Text'. Well, it seems as if Blend was smart enough to know that ... and not generate the key frames in the animation (it would just modify the value directly on the TextBox). +1 for Blend. So, the question became: why isn't TextBox.Text animatable? The usual answer is that the particular property you are animating isn't a DependencyProperty. But, this isn't the case, TextBox.Text is a DependencyProperty. So, now I am bewildered! Why can't you animate TextBox.Text? Let me include some xaml to illustrate the problem. The following xaml works ... but uses TextBlock(s). <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="TextBoxTextQuestion.MainWindow" x:Name="Window" Title="MainWindow" Width="640" Height="480" > <Window.Resources> <Storyboard x:Key="animateTextStoryboard"> <StringAnimationUsingKeyFrames Storyboard.TargetProperty="(TextBlock.Text)" Storyboard.TargetName="textControl"> <DiscreteStringKeyFrame KeyTime="0:0:1" Value="Goodbye"/> </StringAnimationUsingKeyFrames> </Storyboard> </Window.Resources> <Window.Triggers> <EventTrigger RoutedEvent="FrameworkElement.Loaded"> <BeginStoryboard Storyboard="{StaticResource animateTextStoryboard}"/> </EventTrigger> </Window.Triggers> <Grid x:Name="LayoutRoot"> <StackPanel Orientation="Vertical" HorizontalAlignment="Center" VerticalAlignment="Center"> <TextBlock x:Name="textControl" Text="Hello" FontFamily="Calibri" FontSize="32"/> <TextBlock Text="World!" Margin="0,25,0,0" FontFamily="Calibri" FontSize="32"/> </StackPanel> </Grid> </Window> The following xaml does not work and uses TextBox.Text: <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="TextBoxTextQuestion.MainWindow" x:Name="Window" Title="MainWindow" Width="640" Height="480" > <Window.Resources> <Storyboard x:Key="animateTextStoryboard"> <StringAnimationUsingKeyFrames Storyboard.TargetProperty="(TextBox.Text)" Storyboard.TargetName="textControl"> <DiscreteStringKeyFrame KeyTime="0:0:1" Value="Goodbye"/> </StringAnimationUsingKeyFrames> </Storyboard> </Window.Resources> <Window.Triggers> <EventTrigger RoutedEvent="FrameworkElement.Loaded"> <BeginStoryboard Storyboard="{StaticResource animateTextStoryboard}"/> </EventTrigger> </Window.Triggers> <Grid x:Name="LayoutRoot"> <StackPanel Orientation="Vertical" HorizontalAlignment="Center" VerticalAlignment="Center"> <TextBox x:Name="textControl" Text="Hello" FontFamily="Calibri" FontSize="32"/> <TextBox Text="World!" Margin="0,25,0,0" FontFamily="Calibri" FontSize="32"/> </StackPanel> </Grid> </Window>

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