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• How to handle a DataTemplate creation

  - by Shimmy

  Hello! Take a look at the following xaml: <ListBox ItemsSource="{Binding}"> <ListBox.Resources> <CollectionViewSource x:Key="CVS"/> </ListBox.Resources> <ListBox.DataTemplate> <DataTemplate OnBinding="myBinding"> <ListBox DataContext="{StaticResource CVS}" ItemsSource="{Binding}" /> </DataTemplate> </ListBox.DataTemplate> </ListBox> So I can handle the binding and manually retrieve the CVS and set its Source property to my custom stuff according to the DataTemplate's DataContext. Or else there is a different way in doing it. Any ideas are welcommed!

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• Datatemplate binding

  - by Lasse O

  How can i achieve something like this: <ListView Name="OverviewTitlesListView" ItemsSource="{Binding OverviewTitlesCollection}"> <ListView.View> <GridView> <GridViewColumn Header="Index" Width="60" DisplayMemberBinding="{Binding TitleIndex}"/> <GridViewColumn Header="Start Time" Width="100" DisplayMemberBinding="{Binding StartTime}"/> <GridViewColumn Header="End Time" Width="100" DisplayMemberBinding="{Binding EndTime}"/> <GridViewColumn Header="Title Text" Width="550" DisplayMemberBinding="{Binding Text}"/> <GridViewColumn Header="Approved" Width="80"> <GridViewColumn.CellTemplate> <DataTemplate> <TextBlock Name="Test"/> <DataTemplate.Triggers> <Trigger Property="{Binding IsApproved}" Value="true"> <Setter TargetName="Test" Property="Text" Value="Approved"/> </Trigger> <Trigger Property="{Binding IsApproved}" Value="false"> <Setter TargetName="Test" Property="Text" Value="Not Approved"/> </Trigger> </DataTemplate.Triggers> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> </GridView> </ListView.View> </ListView> When IsApproved property changes on my object in OverviewTitlesCollection i want to control the text of the TextBlock. How can i control this by triggers in my datatemplate?

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• Why is my image being displayed larger?

  - by bsh152s

  I'm trying to display an image on a splash screen and it's being stretched upon display. The image I'm trying to display is a simple bmp file. Any ideas why? In SplashWindow.xaml: <Window ... SizeToContent="WidthAndHeight"> <Grid> ... <Image Grid.Row="0" Source="{Binding SplashImage}"></Image> </Grid> </Window> In SplashViewModel.cs public ImageSource SplashImage { get { return ImageUtilities.GetImageSource(_splashImageFilenameString); } } From ImageUtilities.cs public static ImageSource GetImageSource(string imageFilename) { BitmapFrame bitmapFrame = null; if(!string.IsNullOrEmpty(imageFilename)) { if(File.Exists(imageFilename)) { bitmapFrame = BitmapFrame.Create(new Uri(imageFilename)); } else { Debug.Assert(false, "File " + imageFilename + " does not exist."); } } return bitmapFrame; }

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• How to set an Image fit to width of ScrollViewer

  - by Raj

  I've Image placed inside a ScrollViewer. <ScrollViewer x:Name="imageScroller" Grid.Column="2" Margin="5" HorizontalScrollBarVisibility="Visible" VerticalScrollBarVisibility="Visible"> <Image x:Name="imageViewer" Cursor="Hand" RenderTransformOrigin="0,0" Margin="0"> <Image.LayoutTransform> <ScaleTransform ScaleX="{Binding Path=Zoom, Converter={StaticResource debugConverter}}" ScaleY="{Binding Path=Zoom, Converter={StaticResource debugConverter}}"/> </Image.LayoutTransform> </Image> </ScrollViewer> How do I zoom image like "fit-to-width" in document viewers to the size and height of ScrollViewer?

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• Get Child window using ProcessID or Window Handle?

  - by Cool

  Hi, My program A launched program B (both are separate exe's). Now my program B need to find if A have any modal/child window open using A's processID. Is there any way to do so? Thanks a lot for your help.

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• Problem with binding from style

  - by Maurizio Reginelli

  I have this block of xaml and I made a ViewModel which contains a property called MyBrush. I would like to set the grid background to that property but this block doesn't work. Could you tell me how can I do that? <Style x:Key="myKey" TargetType="myType"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="myType"> <Grid Background="{Binding RelativeSource={RelativeSource Self}, Path=MyBrush}"> ...

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• Is it possible to vertical align listitem marker in a flowdocument?

  - by Oggy

  I want to to align listitem marker to the top, default is alignment to the bottom of the first block. My faulty code: <Grid> <FlowDocumentScrollViewer> <FlowDocument> <List MarkerStyle="Decimal"> <ListItem> <BlockUIContainer> <Grid> <Rectangle Height="100" Fill="HotPink" /> <TextBlock VerticalAlignment="Center" HorizontalAlignment="Center">Picture</TextBlock> </Grid> </BlockUIContainer> <Paragraph>TextTextTextTextTextTextText</Paragraph> </ListItem> </List> </FlowDocument> </FlowDocumentScrollViewer> </Grid>

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• Can I use Property Trigger to get selected items from WPFToolkit datagrid ?

  - by Anish

  Hi, I have a wpfToolkit-datagrid. Can I use a trigger for the following "IsSelected" property to update a selectedItems list in view-model ? < Style TargetType="tk:DataGridRow" < Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" / < /Style

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• IndexOutofRangeException while using WriteLine in nested Parallel.For loops

  - by Umar Asif

  I am trying to write kinect depth data to a text file using nested Parallel.For loops with the following code. However, it gives IndexOutofRangeException. The code works perfect if using simple for loops but it hangs the UI since the depth format is set to 640x480 causing the loops to write 307200 lines in the text file at 30fps. Therefore, I switched to Parallel. For scheme. If I omit the writeLine command from the nested loops, the code works fine, which indicates that the IndexOutofRangeException is arising at the writeline command. I do not know how to troubleshoot this. Please advise. Any better workarounds to avoid UI freezing? Thanks. using (DepthImageFrame depthImageframe = d.OpenDepthImageFrame()) { if (depthImageframe == null) return; depthImageframe.CopyPixelDataTo(depthPixelData); swDepth = new StreamWriter(@"E:\depthData.txt", false); int i = 0; Parallel.For(0, depthImageframe.Width, delegate(int x) { Parallel.For(0, depthImageframe.Height, delegate(int y) { p[i] = sensor.MapDepthToSkeletonPoint(depthImageframe.Format, x, y, depthPixelData[x + depthImageframe.Width * y]); swDepth.WriteLine(i + "," + p[k].X + "," + p[k].Y + "," + p[k].Z); i++; }); }); swDepth.Close(); } }

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• Subscribe to the Button's events into a custom control

  - by ThitoO

  Do you know how can I subscribe to an event of the base of my customControl ? I've a custom control with some dependency properties : public class MyCustomControl : Button { static MyCustomControl () { DefaultStyleKeyProperty.OverrideMetadata( typeof( MyCustomControl ), new FrameworkPropertyMetadata( typeof( MyCustomControl ) ) ); } public ICommand KeyDownCommand { get { return (ICommand)GetValue( KeyDownCommandProperty ); } set { SetValue( KeyDownCommandProperty, value ); } } public static readonly DependencyProperty KeyDownCommandProperty = DependencyProperty.Register( "KeyDownCommand", typeof( ICommand ), typeof( MyCustomControl ) ); public ICommand KeyUpCommand { get { return (ICommand)GetValue( KeyUpCommandProperty ); } set { SetValue( KeyUpCommandProperty, value ); } } public static readonly DependencyProperty KeyUpCommandProperty = DependencyProperty.Register( "KeyUpCommand", typeof( ICommand ), typeof( MyCustomControl ) ); public ICommand KeyPressedCommand { get { return (ICommand)GetValue( KeyPressedCommandProperty ); } set { SetValue( KeyPressedCommandProperty, value ); } } public static readonly DependencyProperty KeyPressedCommandProperty = DependencyProperty.Register( "KeyPressedCommand", typeof( ICommand ), typeof( MyCustomControl ) ); } And I whant to subscribe to Button's events (like MouseLeftButtonDown) to run some code in my customControl. Do you know how can I do something like this in the constructor ? static MyCustomControl() { DefaultStyleKeyProperty.OverrideMetadata( typeof( MyCustomControl ), new FrameworkPropertyMetadata( typeof( MyCustomControl ) ) ); MouseLeftButtonDownEvent += (object sender, MouseButtonEventArgs e) => "something"; } Thanks for you help

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• Problem in setting margin of an object on a grid

  - by Pawan

  Hi, I have inherited a class, say CstateUI from Control class. I am creating an object of CstateUI and setting up the margin of the object. For values of margin I take mouse click points from e.getPosition(grid). The problem is the first object is correctly rendered but on subsequent objects margin is not getting set accurately. Can you please tell me what possibly might be going wrong? Thanks in advance!

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• Trying to get a better understanding of SelectedValuePath and IsSynchronizedWithCurrentItem

  - by rasx

  The following XAML produces a run-time Binding error when I click on an item in the ListBox: <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:sys="clr-namespace:System;assembly=mscorlib" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="WpfApplication1.MainWindow" x:Name="Window" Title="MainWindow" Width="640" Height="480"> <Window.Resources> <x:Array x:Key="strings" Type="{x:Type sys:String}"> <sys:String>one</sys:String> <sys:String>two</sys:String> <sys:String>three</sys:String> <sys:String>four</sys:String> </x:Array> </Window.Resources> <Grid> <ListBox DataContext="{StaticResource strings}" IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding}" SelectedValuePath="{Binding /Length}"> <ListBox.ItemTemplate> <DataTemplate> <Grid> <Grid.Resources> <Style TargetType="{x:Type Label}"> <Setter Property="Background" Value="Yellow"/> <Setter Property="Margin" Value="0,0,4,0"/> <Setter Property="Padding" Value="0"/> </Style> </Grid.Resources> <Grid.ColumnDefinitions> <ColumnDefinition/> <ColumnDefinition/> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition/> <RowDefinition/> </Grid.RowDefinitions> <!-- Row 0 --> <Label Grid.Column="0" Grid.Row="0">String:</Label> <TextBlock Grid.Column="1" Grid.Row="0" Text="{Binding}"/> <!-- Row 1 --> <Label Grid.Column="0" Grid.Row="1">Length:</Label> <TextBlock Grid.Column="1" Grid.Row="1" Text="{Binding Length, Mode=Default}"/> </Grid> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </Grid> </Window> This is the run-time Binding error message: System.Windows.Data Error: 39 : BindingExpression path error: '3' property not found on 'object' ''String' (HashCode=1191344027)'. BindingExpression:Path=3; DataItem='String' (HashCode=1191344027); target element is 'ListBox' (Name=''); target property is 'NoTarget' (type 'Object') I would like the selected value of the ListBox to be the Length of the selected String object. What is wrong with my SelectedValuePath Binding syntax? Are there any related issues with IsSynchronizedWithCurrentItem?

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• DataTrigger with Value Binding

  - by plotnick

  Why this doesn't work? <Style x:Key="ItemContStyle" TargetType="{x:Type ListViewItem}"> <Style.Triggers> <DataTrigger Binding="{Binding Path=Asset}" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window}}, Path=CurrentAsset}"> <Setter Property="Background" Value="Red" /> </DataTrigger> </Style.Triggers>

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• How to assign a dynamic imagebrush resource to a stackpanel's background in code?

  - by Edward Tanguay

  I currently define the background for a user control like this: <UserControl.Background> <ImageBrush ImageSource="{DynamicResource LeftMenuBackgroundImage}" /> </UserControl.Background> How can I move this to code-behind, e.g.: PSEUDO-CODE: StackPanel sp = new StackPanel(); sp.Background = new ImageBrush(DynamicResource.GetResourceName("LeftMenuBackgroundImage"));

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• ListBox and Listview problem

  - by Anu

  Hi, I have listbox in my applcation and corresponding coding.. XAML: <DataTemplate x:Key="menuItemTemplate"> <WrapPanel> <TextBlock Text="{Binding Path = Menu}" /> </WrapPanel> </DataTemplate> <ListBox x:Name="menubox" ItemsSource="{Binding}" ItemTemplate="{StaticResource menuItemTemplate}" Margin="0,5,0,0"> .CS : public void Add(string[] menu) { ItemList items = ItemList.Load(menu); DataContext = items; } It works fine.Later i add Listview for another purpose and i coded like the same way of listbox XAML: <DataTemplate x:Key="ListItemTemplate"> <WrapPanel> <TextBlock Text="{Binding Path = Title}" /> </WrapPanel> </DataTemplate> <ListView ItemsSource="{Binding}" ItemTemplate="{StaticResource ListItemTemplate}" Name="listView1" /> .cs coding: public void SetTree(string Title,int BoxNo ) { TreeList items1 = TreeList.Load(Title,BoxNo); DataContext = items1; } After adding Listview,what happended this ListView show data,but Listbox didnot show anything.When i click the listbox it perfectly executing the clicking event of listbox.Only problem it doesnot display the text.What can i do for that. Here i added corresponding list class pls see tht. namespace Tabcontrol { public class TreeList : Collection<TreeItems> { public int size; public TreeList() { size = 0; } public int Count { get { return size; } } public static TreeList Load(string pmenu,int Box) { TreeList result = new TreeList(); TreeItems item = TreeItems.Load(pmenu,Box); result.Add(item); return result; } } } The ItemList class also the same thing, only variable names are getting differred.

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• MVVM pattern: ViewModel updates after Model server roundtrip

  - by Pavel Savara

  I have stateless services and anemic domain objects on server side. Model between server and client is POCO DTO. The client should become MVVM. The model could be graph of about 100 instances of 20 different classes. The client editor contains diverse tab-pages all of them live-connected to model/viewmodel. My problem is how to propagate changes after server round-trip nice way. It's quite easy to propagate changes from ViewModel to DTO. For way back it would be possible to throw away old DTO and replace it whole with new one, but it will cause lot of redrawing for lists/DataTemplates. I could gather the server side changes and transmit them to client side. But the names of fields changed would be domain/DTO specific, not ViewModel specific. And the mapping seems nontrivial to me. If I should do it imperative way after round-trip, it would break SOC/modularity of viewModels. I'm thinking about some kind of mapping rule engine, something like automappper or emit mapper. But it solves just very plain use-cases. I don't see how it would map/propagate/convert adding items to list or removal. How to identify instances in collections so it could merge values to existing instances. As well it should propagate validation/error info. Maybe I should implement INotifyPropertyChanged on DTO and try to replay server side events on it ? And then bind ViewModel to it ? Would binding solve the problems with collection merges nice way ? Is EventAgregator from PRISM useful for that ? Is there any event record-replay component ? Is there better client side pattern for architecture with server side logic ?

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• UI not redrawing after display powered off on Win 7

  - by oltman

  Some portions of my application's interface are not getting refreshed after Windows 7 powers down the display. More specifically, I'm swapping out images, User Controls, and a button's content while the display is powered off and after it has been restarted, and this isn't being reflected in the UI until I minimize and restore the window or move it to one of the screen's edges. I've tried calling the Window's InvalidateVisual() method when the app was in a state where it needed to redraw, and that didn't solve the problem. I have only been able to reproduce this issue on Windows 7. Any ideas?

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• Escape from DataContext

  - by grayscales

  I have a window that get its data from another class that is passed as DataContext. But I now also want to do data binding within the window. The window looks as follows: <Window x:Class="WpfApplication1.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"> <StackPanel> <TextBlock Text="{Binding UserName}" /> <TextBlock x:Name="TestTextBlock">Hello World</TextBlock> <TextBlock x:Name="TestTextBlock2" Text="{Binding ElementName=TestTextBlock,Path=Text}" /> </StackPanel> </Window> The binding between the text blocks TestTextBlock and TestTextBlock2 works fine, but only until I change the DataContext-property of the window. How can I bind between those two textblocks so that changing the DataContext will not break the data binding? Thanks in advance, Stefan

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• Deleteing an image in run time

  - by Nadav Stern

  hey, i am trying to delete an image with the method: (the file path is correct by 100%) if(File.Exists(filePath)) File.Delete(filePath); and i am getting the following exception : An unhandled exception of type 'System.IO.IOException' occurred in mscorlib.dll Additional information: The process cannot access the file 'C:\visual_programming\yad2\yad2\bin\Debug\images\1.jpg' because it is being used by another process. thanks in advance for your help

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• Migrate style from TabItem to TabHeader

  - by OffApps Cory

  Good day! I have a TabControl with TabItems that have been customized via a control template. This control template specifies a trigger whereby on mouseover, the content of tab header grows slightly. <ControlTemplate> <Storyboard x:Key="TabHeaderGrow"> <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="TabName" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)"> <SplineDoubleKeyFrame KeyTime="00:00:00.1000000" Value="1.1"/> </DoubleAnimationUsingKeyFrames> <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="TabName" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleY)"> <SplineDoubleKeyFrame KeyTime="00:00:00.1000000" Value="1.1"/> </DoubleAnimationUsingKeyFrames> </Storyboard> <ControlTemplate.Triggers> <EventTrigger RoutedEvent="Mouse.MouseEnter"> <BeginStoryboard Storyboard="{StaticResource TabHeaderGrow}"/> </EventTrigger> When I mouseover any of the tabs they work as expected, however the trigger also fires when I mouseover any of the elements in the tab body. I know that I need to migrate the control styling to a tabHeader controlTemplate, but I am unsure how to do that. I can't seem to do template binding for the content of the tabheader. Any help would be appreciated.

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• MVVM- Is there a way that I can get and set a textbox's text without using databinding?

  - by highone

  I need to be able to get and set the textbox's text, but I don't want every single change in the textbox's text to update a string in my viewmodel. It seems to me that binding a string to the textbox's text property would be nearly as inefficient as updating a string on a textbox's textchanged event or am I wrong?

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• Evenly distibuted scatterViewItems that dont overlap

  - by Christo Fur

  Hi I have an app that creates a variable number of ScatterviewItems based on which tagged object is placed on the surface table. The ScatterViewItems are added programatically to the ScatterView based on info looked up in a DB The Scatterview does a good job of displaying this info However, I would like them to be evenly distributed across the table and not have any items overlapping Any ideas how to do that?

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• AdornerDecorator and tab stop issues

  - by Trev

  Hi, I am using IDataErrorInfo to validate and indicate errors in my text boxes. I am finding I have to tab once for the text box and once for the adornerdecorator. I have an error template: <ControlTemplate x:Key="ErrorTemplate"> <StackPanel KeyboardNavigation.IsTabStop="False" > <Border KeyboardNavigation.IsTabStop="False" BorderBrush="Red" BorderThickness="1" Padding="2" CornerRadius="2"> <AdornedElementPlaceholder KeyboardNavigation.IsTabStop="False" /> </Border> </StackPanel> </ControlTemplate> a textbox template: <Style x:Key="TextBoxInError" TargetType="{x:Type TextBox}"> <Setter Property="KeyboardNavigation.TabNavigation" Value="None"/> <Setter Property="FocusVisualStyle" Value="{x:Null}"/> <Setter Property="Margin" Value="0,5,0,5"/> <Setter Property="AllowDrop" Value="true"/> <Setter Property="HorizontalContentAlignment" Value="left"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type TextBox}"> <Grid KeyboardNavigation.IsTabStop="False" > <Border KeyboardNavigation.IsTabStop="False" x:Name="Border" Background="{DynamicResource WindowBackgroundBrush}" BorderBrush="{DynamicResource SolidBorderBrush}" BorderThickness="1" Padding="2" CornerRadius="2"> <ScrollViewer IsTabStop="False" Margin="0" x:Name="PART_ContentHost" Style="{DynamicResource SimpleScrollViewer}" Background="{TemplateBinding Background}"/> </Border> </Grid> <ControlTemplate.Triggers> <Trigger Property="Validation.HasError" Value="true"> <Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors), Converter={StaticResource errorConverter}}"/> </Trigger> <Trigger Property="IsEnabled" Value="false"> <Setter Property="Foreground" Value="Gray"/> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> and declare a text box like this: <AdornerDecorator KeyboardNavigation.IsTabStop="False" > <TextBox Margin="5,5,5,3" x:Name="txtName" IsEnabled="{Binding EditMode}" Validation.ErrorTemplate="{StaticResource ErrorTemplate}" Text="{Binding ApplicationName, Mode=TwoWay, ValidatesOnExceptions=True, NotifyOnValidationError=True, ValidatesOnDataErrors=True}" Height="25" MaxLength="50" MaxLines="1" Style="{StaticResource TextBoxInError}"/> </AdornerDecorator> If the adorner is round one text box as above then I tab once to leave the text box and once to leave the 'adornment' (it seems) If I have the adorner around a stackpanel of text boxes then I tab once each for the text boxes then have to go back through all the 'adornments' in turn. When tabbing through the adornments the focus goes on the red border defined in the control template.. any ideas? thanks

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• How to highlight matching sub-strings inside a ListBox?

  - by Kishore Kumar

  I have one TextBox and one listbox for searching a collection of data. While searching a text inside a Listbox if that matching string is found anywhere in the list it should show in Green color with Bold. eg. I have string collection like "Dependency Property, Custom Property, Normal Property". If I type in the Search Text box "prop" all the Three with "prop" (only the word Prop) should be in Bold and its color should be in green. Any idea how it can be done?. Data inside listbox is represented using DataTemplate.

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• DataGrid calculate difference between values in two databound cells

  - by justMe

  Hello! In my small application I have a DataGrid (see screenshot) that's bound to a list of Measurement objects. A Measurement is just a data container with two properties: Date and CounterGas (float). Each Measurement object represents my gas consumption at a specific date. The list of measurements is bound to the DataGrid as follows: <DataGrid ItemsSource="{Binding Path=Measurements}" AutoGenerateColumns="False"> <DataGrid.Columns> <DataGridTextColumn Header="Date" Binding="{Binding Path=Date, StringFormat={}{0:dd.MM.yyyy}}" /> <DataGridTextColumn Header="Counter Gas" Binding="{Binding Path=ValueGas, StringFormat={}{0:F3}}" /> </DataGrid.Columns> </DataGrid> Well, and now my question :) I'd like to have another column right next to the column "Counter Gas" which shows the difference between the actual counter value and the last counter value. E.g. this additional column should calculate the difference between the value of of Feb. 13th and Feb. 6th = 199.789 - 187.115 = 15.674 What is the best way to achieve this? I'd like to avoid any calculation in the Measurement class which should just hold the data. I'd rather more like the DataGrid to handle the calculation. So is there a way to add another column that just calculates the difference between to values? Maybe using some kind of converter and extreme binding? ;D P.S.: Maybe someone with a better reputation could embed the screenshot. Thanks :)

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