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  • WPF - binding ElementName problem...

    - by zvi
    Hello First Sorry for my English. I wanted to ask why ElementName does not work the first case, and work in the second. I give the two sections of code . the firts not work <Button Name="button1" Width="100" > <Button.LayoutTransform> <ScaleTransform x:Name="ttt" ScaleX="3" ScaleY="6"/> </Button.LayoutTransform> <Button.Triggers> <EventTrigger RoutedEvent="Path.Loaded"> <EventTrigger.Actions> <BeginStoryboard> <Storyboard RepeatBehavior="Forever"> <DoubleAnimation Storyboard.Target="{Binding ElementName=ttt}" Storyboard.TargetProperty="ScaleX" From="10" To="5" Duration="0:0:1" /> </Storyboard> </BeginStoryboard> </EventTrigger.Actions> </EventTrigger> </Button.Triggers> Button </Button> But it does work <Button Name="button1" Width="100" > <Button.LayoutTransform> <ScaleTransform x:Name="ttt" ScaleX="3" ScaleY="6"/> </Button.LayoutTransform> <Button.Triggers> <EventTrigger RoutedEvent="Path.Loaded"> <EventTrigger.Actions> <BeginStoryboard> <Storyboard RepeatBehavior="Forever"> <DoubleAnimation Storyboard.Target="{Binding ElementName=button1}" Storyboard.TargetProperty="Width" From="100" To="50" Duration="0:0:1" /> </Storyboard> </BeginStoryboard> </EventTrigger.Actions> </EventTrigger> </Button.Triggers> Button </Button> I know I can use Storyboard.TargetName .

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  • Enable/Disable WPF buttons depending on the number of clicks

    - by eibhrum
    I have two buttons 'btnPrev' and 'btnNext' What I want to do is to be able to determine the number of clicks of the button so that I could enable and disable them. The process is almost similar to 'paging' method. Initial state: btnPrev - disabled, btnNext - enabled 1st Click (btnNext): btnPrev - enabled, btnNext - enabled 2nd Click (btnNext): btnPrev - enabled, btnNext - enabled 3rd Click (btnNext): btnPrev - enabled, btnNext - disabled the idea is almost the same vice-versa (for btnPrev).

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  • Fill WPF listbox with string array

    - by Archie
    Instead of adding each item one by one to the ListBox destinationList from the string array m_List like this: foreach (object name in m_List) { destinationList.Items.Add((string)name); } Is there any better way I can do it? I don't want to bind the data to the destinationList since I want to delete some entries from the ListBox later on.

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  • WPF/MVVM: Delegating a domain Model collection to a ViewModel

    - by msfanboy
    A domain model collection (normally a List or IEnumerable) is delegated to a ViewModel. Thats means my CustomerViewModel has a order collection of type List or IEnumerable. No change in the list is recognized by the bound control. But with ObservableCollection it is. This is a problem in the MVVM design pattern. How do you cope with it?

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  • WPF - 'Relational' Data in XAML Using DataContext

    - by Andy T
    Hi, Say I have a list of Employee IDs from one data source and a separate data source with a list of Employees, with their ID, Surname, FirstName, etc. Is it possible in XAML only to get the Employee's name from the second data source and display it next to the ID, using something like this (with the syntax corrected)?.. <TextBlock x:Name="EmployeeID" Text="{Binding ID}"></TextBlock> <TextBlock Grid.Column="1" DataContext="{StaticResource EmployeeList[**where ID = {Binding ID}**]}" Text="{Binding Surname}"/> I'm thinking back to my days using XML and XSLT with XPath to achieve the kind of thing shown above. Is this kind of thing possible in XAML? Or do I need to 'denormalize' the data first in code, into one consolidated list? It seems like it should be possible to do this simple task using XAML only, but I can't quite get my head around how you would switch the DataContext correctly and what the syntax would be to achieve this. Is it possible, or am I barking up the wrong tree? Thanks, AT

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  • a loading screen for a c# wpf listbox

    - by evan
    I'm using a list box where there are on average about 500 thumbnails (items) that can be sorted and searched. Since I'm using default databinding and search descriptors (which I've heard are slow due to reflection) the list takes a noticeable pause of a few seconds loading, sorting, and searching (the list dynamically updates based on the contents of the search box so the first one or two letters typed are really slow). I don't think I can fully do away with reflection give the timeframe for the project, and speed isn't super essential, but I'd like some kind of graphical indication of the delay so it doesn't confuse the user. How could I do something like a website video loading screen where the listbox grays out and some kind of loading circle indicates it's processing until the list is ready? Or even just grayed out with the words "Loading..." for a few seconds could work. Any ideas? Thanks in advance for your help and suggestions!!!

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  • Lazy Loading wpf Combobox items

    - by Chris McGrath
    I have an IEnumerable< which lazy loads it's data. I want to just set a Combobox's ItemsSource to the IEnumerable, but when I do it goes and loads all the data anyway (which removes the point of lazy loading). I've tried it with Linq-To-Sql as well since it seems to be a similar theory and it also loads all the data. Is there an easy way to do this?

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  • WPF, getting two way binding to work on custom control

    - by e28Makaveli
    Two way binding does not work on my custom control with the following internals: public partial class ColorInputControl { public ColorInputControl() { InitializeComponent(); colorPicker.AddHandler(ColorPicker.SelectedColorChangedEvent, new RoutedPropertyChangedEventHandler( SelectedColorChanged));; colorPicker.AddHandler(ColorPicker.CancelEvent, new RoutedPropertyChangedEventHandler(OnCancel)); } public static readonly DependencyProperty SelectedColorProperty = DependencyProperty.Register ("SelectedColor", typeof(Color), typeof(ColorInputControl), new PropertyMetadata(Colors.Transparent, null)); public Color SelectedColor { get { return (Color)GetValue(SelectedColorProperty); //return colorPicker.SelectedColor; } set { SetValue(SelectedColorProperty, value); colorPicker.SelectedColor = value; } } private void SelectedColorChanged(object sender, RoutedPropertyChangedEventArgs<Color> e) { SetValue(SelectedColorProperty, colorPicker.SelectedColor); } } SelectedColor is being bound to a property that fires INotifyPropertyChanged event control when it changes. However, I cannot get two way binding to work. Changes from the UI are pesisted to the data source. However, changes originating from the data source are not reflected on the UI. What did I miss? TIA.

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  • WPF ComboBox SelectedItem - change to previous value

    - by Taylor
    Hello, I have a ComboBox that has the SelectedItem bound to the ViewModel. <ComboBox SelectedItem="{Binding SelItem, Mode=TwoWay}" ItemsSource="{Binding MyItems}"> When the user selects a new Item in the View ComboBox, I want to display a prompt and verify that they want to make the change. In the SetItem Property setter in the View Model, I display a Dialog to confirm the selection. When they say yes, it works fine. My problem is, when the user clicks on "No" I am not sure who to get the ComboBox to revert back to the previous value. The Property in the ViewModel has the correct older value, however in the View the ComboBox displays the newly Selected Value. I want the user to select an item, confirm they want to go ahead with it, and if they decide not to, I want the ComboBox to revert back to the previous item. How can I accomplish this? Thanks!

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  • using style in WPF

    - by Polaris
    In my application I use ShinyBlue.xaml resourse Dictionary which has this code for GroupBox control: <Style TargetType="{x:Type GroupBox}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type GroupBox}"> <Grid SnapsToDevicePixels="true"> <Grid.ColumnDefinitions> <ColumnDefinition Width="6" /> <ColumnDefinition Width="Auto" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="6" /> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto" /> <RowDefinition Height="*" /> <RowDefinition Height="6" /> </Grid.RowDefinitions> <Border Grid.ColumnSpan="4" Grid.RowSpan="4" Background="{DynamicResource LightBrush}" CornerRadius="4,4,4,4" BorderThickness="1,1,1,1" /> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> These style common for all app. But in one of the forms I want to change background to Transparent. I want override only Background Property but it's not work <Style TargetType="GroupBox" BasedOn="{StaticResource {x:Type GroupBox}}"> <Setter Property="Background" Value="Transparent"/> </Style> code above not works properly How can I change GroupBox Background in specific form ?.

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  • Serializing WPF RichTextBox to XAML vs RTF

    - by chaiguy
    I have a RichTextBox and need to serialize its content to my database purely for storage purposes. It would appear that I have a choice between serializing as XAML or as RTF, and am wondering if there are any advantages to serializing to XAML over RTF, which I would consider as more "standard". In particular, am I losing any capability by serializing to RTF instead of XAML? I understand XAML supports custom classes inside the FlowDocument, but I'm not currently using any custom classes (though the potential for extensibility might be enough reason to use XAML).

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  • Serializing WPF RichTextBox to XAML vs RTF

    - by chaiguy
    I have a RichTextBox and need to serialize its content to my database purely for storage purposes. It would appear that I have a choice between serializing as XAML or as RTF, and am wondering if there are any advantages to serializing to XAML over RTF, which I would consider as more "standard". In particular, am I losing any capability by serializing to RTF instead of XAML? I understand XAML supports custom classes inside the FlowDocument, but I'm not currently using any custom classes (though the potential for extensibility might be enough reason to use XAML).

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  • wpf set barchart graph width programmatically C#

    - by Aizaz
    I have a chart and I am adding ColumnSeries and chart legend etc but how to programmatically set its bar width... ??? | |------| | | | | |set | | |this | | |width | | | | | | | | | |BarChart Graph |_______|______|_______________________________ <charting:Chart x:Name="mainChart" Grid.Row="0" Margin="0,8,8,8" Title="Protocols Usage" Height="Auto" Width="Auto" LegendTitle="Protocols" Background="#FFE5F1FE"> </charting:Chart> legend and others things produced on the fly... How to set width of ColumnSeries from C# code?

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  • WPF In-Memory Image Display

    - by Aren B
    Im trying to build an Item Template for my list-view and im bound to a list of Entities. The entity I have has a System.Drawing.Image that I'd like to display, but so far I cannot for the life of me figure out how to bind it to the <Image> block. Every example and documentation I can find on the internet pertains to Images accessible via an uri i.e. File on HDD or On Website <DataTemplate x:Key="LogoPreviewItem"> <Border BorderBrush="Black" BorderThickness="1"> <DockPanel Width="150" Height="100"> <Image> <Image.Source> <!-- {Binding PreviewImage} is where the System.Drawing.Image is in this context --> </Image.Source> </Image> <Label DockPanel.Dock="Bottom" Content="{Binding CustomerName}" /> </DockPanel> </Border> </DataTemplate>

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  • WPF Border DesiredHeight

    - by Joseph Sturtevant
    The following Microsoft example code contains the following: <Grid> ... <Border Name="Content" ... > ... </Border> </Grid> <ControlTemplate.Triggers> <Trigger Property="IsExpanded" Value="True"> <Setter TargetName="ContentRow" Property="Height" Value="{Binding ElementName=Content,Path=DesiredHeight}" /> </Trigger> ... </ControlTemplate.Triggers> When run, however, this code generates the following databinding error: System.Windows.Data Error: 39 : BindingExpression path error: 'DesiredHeight' property not found on 'object' ''Border' (Name='Content')'. BindingExpression:Path=DesiredHeight; DataItem='Border' (Name='Content'); target element is 'RowDefinition' (HashCode=2034711); target property is 'Height' (type 'GridLength') Despite this error, the code works correctly. I have looked through the documentation and DesiredHeight does not appear to be a member of Border. Can anyone explain where DesiredHeight is coming from? Also, is there any way to resolve/suppress this error so my program output is clean?

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  • WPF - Adding ContentControl to Custom Canvas

    - by Alp Hancioglu
    I have a custom DrawingCanvas which is inherited from Canvas. When I add a ContentControl to DrawingCanvas with the following code nothing shows up. GraphicsRectangle rect = new GraphicsRectangle(0, 0, 200, 200, 5, Colors.Blue); DrawingContainer host = new DrawingContainer(rect); ContentControl control = new ContentControl(); control.Width = 200; control.Height = 200; DrawingCanvas.SetLeft(control, 100); DrawingCanvas.SetTop(control, 100); control.Style = Application.Current.Resources["DesignerItemStyle"] as Style; control.Content = host; drawingCanvas.Children.Add(control); GraphicsRectangle is a DrawingVisual and the constructor above draws a Rect with (0,0) top left point and length of 200 to the drawingContext of GraphicsRectangle. DrawingContainer is a FrameworkElement and it has one child, which is rect above, given with constructor. DrawingContainer implements GetVisualChild and VisualChildrenCount override methods. At last, Content property of ContentControl is set to the DrawingContainer to be able to show the DrawingVisual's content. When I add the created ContentControl to a regular Canvas, control is showed correctly. I guess the reason is that DrawingCanvas doesn't implement ArrangeOverride method. It only implements MeasureOverride method. Also DrawingContainer doesn't implement Measure and Arrange override methods. Any ideas?

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  • WPF Horizontal Scrollbar is not visible

    - by Ant
    Hi All,      I have a Grid inside ScrollViewer. Grid has only one columns and many rows. I add controls into grid rows. The problem is I can see VerticalScrollBar when I am adding controls but I cannot see HorizontalScrollBar although I add very wide controls. My xaml looks like the following <ScrollViewer> <Grid> rows ... </Grid> </ScrollViewer> Thanks, ant.

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  • wpf do animation until background worker finishes its work

    - by toni
    Hi! I have an application that do some hard stuff when user clicks a start button and takes a long time. During this I would like to do some animation over a label, for example, changing opacity from 0 to 1 and vice versa and change foreground color between several colors at the same time changing opacity. I want it stops doing animation when background worker finishes its work. How can I do this? and how can I start animation and stop it from c#? Thanks very much!

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  • WPF: Disable ListBox, but enable scrolling

    - by Matt Briggs
    Been banging my head against this all morning. Basically, I have a listbox, and I want to keep people from changing the selection during a long running process, but allow them to still scroll. Solution: All the answers were good, I went with swallowing mouse events since that was the most straight forward. I wired PreviewMouseDown and PreviewMouseUp to a single event, which checked my backgroundWorker.IsBusy, and if it was set the IsHandled property on the event args to true.

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