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  • Implementing custom CanExecuteChanged event with Commands in WPF

    - by ajtp
    Hi everybody, I try to do a custom CanExecuteChanged event for a command button. Inside CanExecuteChanged event I would like to do some stuff when canExecute value change but I don't want to do it by implementing a custom command button class (deriving from Button and Implementing ICommandSource). Also I don't want to do my stuff into CanExecute method. Any ideas? Thanks.

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  • WPF - Virtualizing an ItemsControl?

    - by Rachel
    I have an ItemsControl containing a list of data that I would like to virtualize, however VirtualizingStackPanel.IsVirtualizing="True" does not seem to work with an ItemsControl. Is this really the case or is there another way of doing this that I am not aware of? To test I have been using the following block of code: <ItemsControl VirtualizingStackPanel.IsVirtualizing="True" ItemsSource="{Binding Path=AccountViews.Tables[0]}"> <ItemsControl.ItemTemplate> <DataTemplate> <TextBlock Initialized="TextBlock_Initialized" Margin="5,50,5,50" Text="{Binding Path=Name}" /> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> If I change the ItemsControl to a ListBox, I can see that the Initialized function only runs a handful of times (the huge margins are just so I only have to go through a few records), however as an ItemsControl every item gets initialized. I have tried setting the ItemsControlPanelTemplate to a VirtualizingStackPanel but that doesn't seem to help.

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  • Display Image from Byte Array in WPF - Memory Issues

    - by ChrisFletcher
    Hi, I've developed an application to capture and save images to a database, but I'm having an issue with memory usage. On my domain object I have 3 properties: Image - Byte array, contents are a jpg RealImageThumb - The byte array converted to a BitmapImage and shrunk, displayed to the user in a gridview with other thumbnails RealImage - Has no setter, the byte array converted to a bitmap source, this is shown in a tooltip when the user hovers over it. The issue I have is that if a user hovers over each image in turn the memory usage spirals. I realise that as a user hovers over bitmap sources are generated and the memory isn't freed up, I've tried giving RealImage a backing property and assigning this to null after but again the memory isn't freed up (waiting for the garbage colelctor?.

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  • WPF and XPS: Empty Document Viewer

    - by xscape
    byte[] mediaBytes = Convert.FromBase64String("<<strings>>"); XpsDocument doc; ms = new MemoryStream(mediaBytes, 0, mediaBytes.Length); Uri DocumentUri = new Uri("pack://document.xps"); using (Package package = Package.Open(ms, FileMode.Create)) { PackageStore.AddPackage(DocumentUri, package); doc = new XpsDocument(package, CompressionOption.Maximum, DocumentUri.AbsoluteUri); FixedDocumentSequence fds = doc.GetFixedDocumentSequence(); documentViewer.Document = fds as IDocumentPaginatorSource; PackageStore.RemovePackage(DocumentUri); doc.Close(); } Can anyone please help me. Its result is an empty document. The mediaBytes is a PDF document.

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  • WPF Error when implementing Login.xaml

    - by LnDCobra
    I am getting the following exception: "Nullable object must have a value" Everything was working when I was using StartupURI="MainWindow.xaml" but I wanted to implement a login screen so I changed this to Startup="Application_Startup" and then created the following method in App.xaml.cs: private void Application_Startup(object sender, StartupEventArgs e) { UpdateAccounts(); bool result = true; ///* LoginWindow login = new LoginWindow(); result = login.ShowDialog().Value; /* */ if (!result) { return; } MainWindow window = new MainWindow(); bool main = window.ShowDialog().Value; } Does anyone have any idea what is going on? Or any suggestions on what is the best practice for implementing login interface.

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  • WPF Control Background under GridViewColumn

    - by sergo_lsn
    Hi, I'd like make background for colums like in this image http://www.freeimagehosting.net/image.php?e2435df982.png I have CheckBoxes on the left and TreeView on the right. In one column I have checkboxes in other I have treeview. In column with checkboxes I need set background. Background has to be permanent. .... </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> <GridViewColumn Width="25"> All column has to have background not only cell <GridViewColumn.CellTemplate> <DataTemplate> <CheckBox> <CheckBox.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> .... </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </CheckBox.Resources> </CheckBox> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> </GridViewColumn> <GridViewColumn Width="300"/> </TreeListView.Columns> <TreeListView.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> ... TreeView.xaml </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </TreeListView.Resources> <TreeListView.ItemTemplate> <HierarchicalDataTemplate> <HierarchicalDataTemplate.ItemsSource> .... </HierarchicalDataTemplate.ItemsSource> </HierarchicalDataTemplate> </TreeListView.ItemTemplate> </TreeListView>

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  • WPF RibbonButton

    - by melculetz
    How can I programatically set the text on a RibbonButton? Right now I have the code below, but the button does not display 'Browse'. Any suggestions? RibbonButton btn = new RibbonButton(); btn.Name = "btnBrowse"; btn.Content = "Browse"; btn.HorizontalAlignment = System.Windows.HorizontalAlignment.Left; btn.Click += new RoutedEventHandler(btn_Click);

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  • WPF with MVVM and Prismv2 - Event Bubbling?

    - by depictureboy
    What is the best way to get an event from a child or grandchild module up to the parent Shell? For instance, if I have a view in a module that is actually 2 levels away from the Shell, and I have a Window behavior. Is the eventaggregator really the best way to do this? it seems like overkill. I just want my MainShell to watch for a change in the IsDialogOpen Property on the ViewModels in all my child modules. I feel like I am missing the trees for the forest...

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  • [WPF Datagrid] Binding to a List<>

    - by Tr?n Qu?c Bình
    I have a datagrid like this: <dg:DataGrid Name="dg" AutoGenerateColumns="False" CanUserDeleteRows="True"> <dg:DataGrid.Columns> <dg:DataGridTextColumn Header="Product Code" x:Name="columnProductCode" Binding="{Binding Path=Product.ProductCode}" IsReadOnly="True" ></dg:DataGridTextColumn> <dg:DataGridTextColumn Header="Product Name" x:Name="columnProductName" Binding="{Binding Path=Product.Name}" IsReadOnly="True" ></dg:DataGridTextColumn> <dg:DataGridTextColumn Header="ProductMeasure" x:Name="columnDonViTinh" Binding="{Binding Path=Product.Measure IsReadOnly="True"></dg:DataGridTextColumn> <dg:DataGridTextColumn Header="Quantity" x:Name="ColumnQuantity" Binding="{Binding Path=Quantity IsReadOnly="False"></dg:DataGridTextColumn> </dg:DataGrid.Columns> </dg:DataGrid> In the behind code, I have a struct like this: private struct ProductDetail { public TProduct Product { get; set ; } // TProduct is a class provied by a web service public int Quantity { get; set; } } and a List like this: private IList<ProductDetail> bs = new List<ProductDetail>(); I had tried to fill data to "bs". And binding like this: this.dg.ItemsSource = this.bs; Everything is ok. I can insert a new row, delete row, but when I try to modified the column Quantity then click on the header of the datagrid (to resort) -- the Quantity column change to it is before. How can I fix this problem. Thanks advanced.

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  • WPF Storyboard issue

    - by Vinjamuri
    In the following template, the button is displayed with Normal image when the application is started, but when the mouse is over, the button doesn't get changed to mouse over image. Appreciate your help!!! I want some solution without major changes in the design. <Style TargetType="{x:Type local:ButtonControl}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type local:ButtonControl}"> <Grid> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="CommonStates"> <VisualState x:Name="Normal"> <Storyboard> <DoubleAnimation Duration="00:00:00.20" Storyboard.TargetName="imgNormal" Storyboard.TargetProperty="Opacity" To="1" /> </Storyboard> </VisualState> <VisualState x:Name="MouseOver"> <Storyboard> <DoubleAnimation Duration="00:00:00.20" Storyboard.TargetName="imgNormal" Storyboard.TargetProperty="Opacity" To="0" /> <DoubleAnimation Duration="00:00:00.20" Storyboard.TargetName="imgOver" Storyboard.TargetProperty="Opacity" To="1" /> </Storyboard> </VisualState> <VisualState x:Name="Disabled"> <Storyboard> <DoubleAnimation Duration="00:00:00.20" Storyboard.TargetName="imgDisable" Storyboard.TargetProperty="Opacity" To="1" /> </Storyboard> </VisualState> <VisualState x:Name="Pressed"> <Storyboard> <DoubleAnimation Duration="00:00:00.20" Storyboard.TargetName="imgPress" Storyboard.TargetProperty="Opacity" To="1" /> </Storyboard> </VisualState> </VisualStateGroup> </VisualStateManager.VisualStateGroups> <Grid> <Border x:Name="imgNormal"> <Image Source="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=NormalImage}" Opacity="1" Stretch="UniformToFill"/> </Border> </Grid> <Grid> <Border x:Name="imgOver"> <Image Source="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=MouseOverImage}" Opacity="0" Stretch="UniformToFill"/> </Border> </Grid> <Grid> <Border x:Name="imgDisable"> <Image Source="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=DisableImage}" Opacity="0" Stretch="UniformToFill"/> </Border> </Grid> <Grid> <Border x:Name="imgPress"> <Image Source="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=MousePressImage}" Opacity="0" Stretch="UniformToFill"/> </Border> </Grid> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style>

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  • Measuring WPF Rendering Performance

    - by Wonko the Sane
    Hi All, I am looking to get some better performance on an ItemsControl, and I believe that the biggest hang-up is the rendering. The ItemTemplate of the control consists of (basically) a Border around an ImageBrush. The ItemsSource is an ObservableCollection of a custom class (of which I have no real control). What I'd like to know are some techniques for measuring (rudimentary measurements are fine to start with) the performance. This is an XP machine using .NET 3.5 SP1. Thanks, wTs

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  • WPF - Getting the value of one a DataGridCell from within DataTemplateSelector

    - by Andy T
    Hi, I'm using DataTemplateSelector with the WPFToolkit DataGrid. I want to select the editing template for one cell based on the value of another cell on the same row. The DataTemplateSelector's SelectTemplate method takes two arguments: one is the data item displayed by the grid row, the other is the grid cell. What I want to know is how to get the value of another cell from within the SelectTemplate method. However, I'm not sure of the correct way to get this information by accessing properties of the cell. public class RangeValuesEditTemplateSelector : DataTemplateSelector { public DataTemplate NumberTemplate{get; set;} public DataTemplate TextTemplate{get; set;} public override DataTemplate SelectTemplate(object item, DependencyObject container) { //TODO: need to find the correct way to populate the if condition below DataGridCell theCell = container as DataGridCell; if (theCell.something.somethingElse) { return NumberTemplate; }else{ return TextTemplate; } } } Can anyone help? Many thanks in advance. AT

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  • wpf combobox padding

    - by Jose
    This is a simple question How do you remove the space between the content of a combobox and the border of it. E.g. If the selection of a combobox is "Selection 1" then the "S" is drawn at the very top left of the ComboBox control with no whitespace spacing between it and top left portion of the control. I did this <ComboBox Padding="0"/> Even this: <ComboBox.ItemContainerStyle> <Style TargetType="ComboBoxItem"> <Setter Property="Padding" Value="0"/> </Style> </ComboBox.ItemContainerStyle> The specified ComboBox above is within a ListView GridViewColumn. Maybe that's messing with something. This doesn't remove the padding. Any ideas?

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  • WPF - TextBlock - Cannot override OnRender

    - by Nitin Chaudhari
    Hi, I am creating a custom control by deriving TextBlock, my intention is to do some custom rendering based on some dependency properties. However the OnRender method is sealed on TextBlock. Although I can get my work done by overriding OnRenderSizeChanged, this is not correct. Any ideas on how can i do it the right way? Thanks in advance.

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  • Working with Resources in WPF

    - by Coesy
    I am wanting to use the example from http://blogs.microsoft.co.il/blogs/tomershamam/archive/2008/09/22/lt-howto-gt-replace-listview-columns-with-rows-lt-howto-gt.aspx However I don't want to put this into the App.xaml code as this will apply to ALL gridviews, how do I apply this example to a select few gridviews in the application? The Resources look like this <Style TargetType="{x:Type GridViewHeaderRowPresenter}"> <Setter Property="Height" Value="80" /> <Setter Property="LayoutTransform"> <Setter.Value> <TransformGroup> <RotateTransform Angle="-90" /> <ScaleTransform ScaleY="-1" /> </TransformGroup> </Setter.Value> </Setter> </Style> <Style TargetType="{x:Type GridViewRowPresenter}"> <Setter Property="LayoutTransform"> <Setter.Value> <TransformGroup> <RotateTransform Angle="-90" /> <ScaleTransform ScaleY="-1" /> </TransformGroup> </Setter.Value> </Setter> </Style> <LinearGradientBrush x:Key="GridViewColumnHeaderBackground" EndPoint="0,1" StartPoint="0,0"> <GradientStop Color="#FFFFFFFF" Offset="0"/> <GradientStop Color="#FFFFFFFF" Offset="0.4091"/> <GradientStop Color="#FFF7F8F9" Offset="1"/> </LinearGradientBrush> <LinearGradientBrush x:Key="GridViewColumnHeaderBorderBackground" EndPoint="0,1" StartPoint="0,0"> <GradientStop Color="#FFF2F2F2" Offset="0"/> <GradientStop Color="#FFD5D5D5" Offset="1"/> </LinearGradientBrush> <LinearGradientBrush x:Key="GridViewColumnHeaderHoverBackground" EndPoint="0,1" StartPoint="0,0"> <GradientStop Color="#FFBDEDFF" Offset="0"/> <GradientStop Color="#FFB7E7FB" Offset="1"/> </LinearGradientBrush> <LinearGradientBrush x:Key="GridViewColumnHeaderPressBackground" EndPoint="0,1" StartPoint="0,0"> <GradientStop Color="#FF8DD6F7" Offset="0"/> <GradientStop Color="#FF8AD1F5" Offset="1"/> </LinearGradientBrush> <Style x:Key="GridViewColumnHeaderGripper" TargetType="{x:Type Thumb}"> <Setter Property="Canvas.Right" Value="-9"/> <Setter Property="Width" Value="18"/> <Setter Property="Height" Value="{Binding Path=ActualHeight, RelativeSource={RelativeSource TemplatedParent}}"/> <Setter Property="Padding" Value="0"/> <Setter Property="Background" Value="{StaticResource GridViewColumnHeaderBorderBackground}"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Thumb}"> <Border Background="Transparent" Padding="{TemplateBinding Padding}"> <Rectangle Fill="{TemplateBinding Background}" HorizontalAlignment="Center" Width="1"/> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style TargetType="{x:Type GridViewColumnHeader}"> <Setter Property="HorizontalContentAlignment" Value="Center"/> <Setter Property="VerticalContentAlignment" Value="Center"/> <Setter Property="Background" Value="{StaticResource GridViewColumnHeaderBackground}"/> <Setter Property="BorderBrush" Value="{StaticResource GridViewColumnHeaderBorderBackground}"/> <Setter Property="BorderThickness" Value="0"/> <Setter Property="Padding" Value="2,0,2,0"/> <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type GridViewColumnHeader}"> <Grid SnapsToDevicePixels="true"> <Border x:Name="HeaderBorder" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="0,1,0,1"> <Grid> <Grid.RowDefinitions> <RowDefinition MaxHeight="7"/> <RowDefinition/> </Grid.RowDefinitions> <Rectangle Fill="#FFE3F7FF" x:Name="UpperHighlight" Visibility="Collapsed"/> <Border Grid.RowSpan="2" Padding="{TemplateBinding Padding}"> <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="0,0,0,1" x:Name="HeaderContent" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" RecognizesAccessKey="True"> <ContentPresenter.LayoutTransform> <TransformGroup> <ScaleTransform ScaleY="-1" /> <RotateTransform Angle="90" /> </TransformGroup> </ContentPresenter.LayoutTransform> </ContentPresenter> </Border> </Grid> </Border> <Border Margin="1,1,0,0" x:Name="HeaderHoverBorder" BorderThickness="1,0,1,1"/> <Border Margin="1,0,0,1" x:Name="HeaderPressBorder" BorderThickness="1,1,1,0"/> <Canvas> <Thumb x:Name="PART_HeaderGripper" Style="{StaticResource GridViewColumnHeaderGripper}"/> </Canvas> </Grid> <ControlTemplate.Triggers> <Trigger Property="IsMouseOver" Value="true"> <Setter Property="Background" TargetName="HeaderBorder" Value="{StaticResource GridViewColumnHeaderHoverBackground}"/> <Setter Property="BorderBrush" TargetName="HeaderHoverBorder" Value="#FF88CBEB"/> <Setter Property="Visibility" TargetName="UpperHighlight" Value="Visible"/> <Setter Property="Background" TargetName="PART_HeaderGripper" Value="Transparent"/> </Trigger> <Trigger Property="IsPressed" Value="true"> <Setter Property="Background" TargetName="HeaderBorder" Value="{StaticResource GridViewColumnHeaderPressBackground}"/> <Setter Property="BorderBrush" TargetName="HeaderHoverBorder" Value="#FF95DAF9"/> <Setter Property="BorderBrush" TargetName="HeaderPressBorder" Value="#FF7A9EB1"/> <Setter Property="Visibility" TargetName="UpperHighlight" Value="Visible"/> <Setter Property="Fill" TargetName="UpperHighlight" Value="#FFBCE4F9"/> <Setter Property="Visibility" TargetName="PART_HeaderGripper" Value="Hidden"/> <Setter Property="Margin" TargetName="HeaderContent" Value="1,1,0,0"/> </Trigger> <Trigger Property="Height" Value="Auto"> <Setter Property="MinHeight" Value="20"/> </Trigger> <Trigger Property="IsEnabled" Value="false"> <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> <Style.Triggers> <Trigger Property="Role" Value="Floating"> <Setter Property="Opacity" Value="0.4082"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type GridViewColumnHeader}"> <Canvas x:Name="PART_FloatingHeaderCanvas"> <Rectangle Fill="#FF000000" Width="{TemplateBinding ActualWidth}" Height="{TemplateBinding ActualHeight}" Opacity="0.4697"/> </Canvas> </ControlTemplate> </Setter.Value> </Setter> </Trigger> <Trigger Property="Role" Value="Padding"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type GridViewColumnHeader}"> <Border x:Name="HeaderBorder" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="0,1,0,1"/> <ControlTemplate.Triggers> <Trigger Property="Height" Value="Auto"> <Setter Property="MinHeight" Value="20"/> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Trigger> </Style.Triggers> </Style> I have tried creating a usercontrol and sticking that lot in the UserControl.Resources section but it didn't work, I can only get this example to work if i put them into the Application.Resources section which i obviously don't want. Help!! :-)

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  • WPF ComboBox SelectedValue not updating from binding source.

    - by vg1890
    Here's my binding source object: Public Class MyListObject Private _mylist As New ObservableCollection(Of String) Private _selectedName As String Public Sub New(ByVal nameList As List(Of String), ByVal defaultName As String) For Each name In nameList _mylist.Add(name) Next _selectedName = defaultName End Sub Public ReadOnly Property MyList() As ObservableCollection(Of String) Get Return _mylist End Get End Property Public ReadOnly Property SelectedName() As String Get Return _selectedName End Get End Property End Class Here is my XAML: <Window x:Class="Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300" xmlns:local="clr-namespace:WpfApplication1" > <Window.Resources> <ObjectDataProvider x:Key="MyListObject" ObjectInstance="" /> </Window.Resources> <Grid> <ComboBox Height="23" Margin="24,91,53,0" Name="ComboBox1" VerticalAlignment="Top" SelectedValue="{Binding Path=SelectedName, Source={StaticResource MyListObject}, Mode=OneWay}" ItemsSource="{Binding Path=MyList, Source={StaticResource MyListObject}, Mode=OneWay}" /> <Button Height="23" HorizontalAlignment="Left" Margin="47,0,0,87" Name="btn_List1" VerticalAlignment="Bottom" Width="75">List 1</Button> <Button Height="23" Margin="0,0,75,87" Name="btn_List2" VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="75">List 2</Button> </Grid> </Window> Here's the code-behind: Class Window1 Private obj1 As MyListObject Private obj2 As MyListObject Private odp As ObjectDataProvider Public Sub New() InitializeComponent() Dim namelist1 As New List(Of String) namelist1.Add("Joe") namelist1.Add("Steve") obj1 = New MyListObject(namelist1, "Steve") . Dim namelist2 As New List(Of String) namelist2.Add("Bob") namelist2.Add("Tim") obj2 = New MyListObject(namelist2, "Tim") odp = DirectCast(Me.FindResource("MyListObject"), ObjectDataProvider) odp.ObjectInstance = obj1 End Sub Private Sub btn_List1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles btn_List1.Click odp.ObjectInstance = obj1 End Sub Private Sub btn_List2_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles btn_List2.Click odp.ObjectInstance = obj2 End Sub End Class When the Window first loads, the bindings hook up fine. The ComboBox contains the names "Joe" and "Steve" and "Steve" is selected by default. However, when I click a button to switch the ObjectInstance to obj2, the ComboBox ItemsSource gets populated correctly in the dropdown, but the SelectedValue is set to Nothing instead of being equal to obj2.SelectedName. Thanks in advance!

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  • WPF - Handling a RoutedEvent in the parent for a specfic control instance

    - by empo
    In my user control I have several textboxes e.g. Textbox1, Textbox2. In the parent I only want to handle KeyDown events raised from Textbox1, not all Textbox I have added a handler in the parent this.AddHandler(TextBox.KeyDownEvent, new RoutedEventHandler(OnTextboxGoToPageKeyDown)); but of course this will handle all KeyDown events which I don't want. Do I have to add some conditional logic in the RoutedEventHandler to check where the event was raised from? or is there a better way? What's the best way to do this? Thanks.

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  • WPF Animation / Processing priority

    - by Matt B
    Hi all, I have a button which has an animation (in xaml) on it's click event. Cool so far. Problem is that I also have processing occurring on the click event (so I can do stuff) - and this occurs first. How do I prioritise or re-order so that the animation takes place before any custom processing... Thanks.

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  • [WPF C#]Get UserControl or VisualTree in DataValidation of TextBlock

    - by dalind
    Hy, I have a validator set on the text property of a textblock. For a correct validation I would need the parent usercontrol of the textblock, but the only things I have in the validator are the value object (a string) and the culture (doesn't help either). Does anyone know a way to get certain usercontrols in a class/a method where I have no access to any kind of visual or control of my application. The problem could be solve if I could give the validator the usercontrol or the textblock as parameters, but I didn't find a way to do so.. Thank you very much for your answers. Greets

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  • WPF Two Commands handlers, One Command

    - by Aran Mulholland
    Im deriving from a third party control. It is implementing ApplicationCommands.SelectAll. However the behaviour i want is slightly different. there is no virtual method i can override, and when i register a class handler, like so CommandManager.RegisterClassCommandBinding(typeof(MyDerivedControl), new CommandBinding(ApplicationCommands.SelectAll, new ExecutedRoutedEventHandler(OnExecutedSelectAll), new CanExecuteRoutedEventHandler(OnCanExecuteSelectAll))); My methods do not get called. The third party control i am deriving from is marking e.Handled=true; in its command handlers ( i know this cause i have seen the source, but i cant modify it ) What can i do?

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  • WPF Listbox - Empty List Display Message

    - by David Ward
    Can anyone suggest the best way to display a Textblock (with a text such as "List Empty") so that it's visibility is bound to the Items.Count. I have tried the following code and can't get it to work, so think that I must be doing it wrong. <ListBox x:Name="lstItems" ItemsSource="{Binding ListItems}"> </ListBox> <TextBlock Margin="4" FontStyle="Italic" FontSize="12" Text="List is empty" Visibility="Collapsed"> <TextBlock.Style> <Style TargetType="{x:Type TextBlock}"> <Style.Triggers> <DataTrigger Binding="{Binding ElementName=lstItems, Path=Items.Count}" Value="0"> <Setter Property="Visibility" Value="Visible" /> </DataTrigger> </Style.Triggers> </Style> </TextBlock.Style> </TextBlock>

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