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• WPF Toolkit DataGrid SelectionChanged Getting Cell Value

  - by Dan Bater

  Hi, Please help me, Im trying to get the value of Cell[0] from the selected row in a SelectionChangedEvent. I am only managing to get lots of different Microsoft.Windows.Controls and am hoping im missing something daft. Hoping I can get some help from here... private void datagrid_SelectionChanged(object sender, SelectionChangedEventArgs e) { Microsoft.Windows.Controls.DataGrid _DataGrid = sender as Microsoft.Windows.Controls.DataGrid; } I was hoping it would be something like... _DataGrid.SelectedCells[0].Value; However .Value isn't an option.... Many many thanks this has been driving me mad! Dan

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• WPF MVVM Trigger Animation on MainWindow close

  - by Scott

  I'm using trying to implement MVVM in my app. I have a MainWindow.xaml and a MainWindowViewModel. I'm in the process of removing all of the code-behind code from the MainWindow.xaml but I'm stuck on one final piece. In my pre-MVVM setup I started an animation in the MainWindow.xaml.cs that would fade out the form before closing it. Since Closing is not a RoutedEvent, I had to use code-behind to get this to work. My VM has the following two properties that can be bound: ClosingWindow and CloseWindow. My goal was to bind a DataTrigger in my MainWindowStyle to the ClosingWindow property of the VM. When ClosingWindow was set to True, it would start an animation using the following XAML: <DataTrigger Binding="{Binding ClosingWindow}" Value="True"> <DataTrigger.EnterActions> <BeginStoryboard> <Storyboard> <DoubleAnimation Storyboard.TargetProperty="Opacity" From="1" To="0" Duration="0:0:2"/> </Storyboard> </BeginStoryboard> </DataTrigger.EnterActions> </DataTrigger> Somehow (insert magic here) I was going to set CloseWindow on the VM, via Binding, to True when the animation completed, which would then use an AttachedBehavior to Close the Window. The AttachedBehavior works perfectly when I just set CloseWindow directly using the following XAML: <DataTrigger Binding="{Binding CloseWindow}" Value="True"> <Setter Property="ab:WindowCloseBehavior.Close" Value="True"/> </DataTrigger> ...but I want to reproduce the form fade before the form actually closes. So there are two issues that I've run into: First, the animation doesn't work. I enter the trigger correctly (I've taken out the animation and put a Setter statement in there that changes the Title of the MainWindow to "Closing" and it changes correctly when ClosingWindow = True) but the DoubleAnimation never does anything. Second, there's no way to set the value of CloseWindow once the animation is complete. I looked at Marlon Grech's animation code but that won't work on DataTriggers. I can't publish a RoutedEvent because my VM doesn't descend from UIElement, and I've been Googling all day trying to come up with a clever, MVVM-friendly way to do this with no luck. So any ideas why that animation doesn't do anything? And more importantly, how would you solve the entire problem of animating a form fade on close from the VM? I don't doubt that my entire solution to this problem might be whacked so I'm open to just about anything.

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• WPF TreeView Virtualization

  - by Carlo

  I'm trying to figure out this virtualization feature, I'm not sure if I'm understanding it wrong or what's going on, but I'm using the ANTS memory profiler to check the number of items in a virtualized TreeView, and it just keeps increasing. I have a TreeView with 1,001 items (1 root, 1000 sub-items), and I always get up to 1,001 TreeViewItems, 1,001 ToggleButtons and 1,001 TextBlocks. Isn't virtualization supposed to re-use the items? If so, why would I have 1,001 of each? Also, the CleanUpVirtualizedItem never fires. Let me know if I'm understanding this wrong and if you have resources on how to use this. I've searched over the internet but haven't found anything useful. EDIT: Even the memory used by the tree grows from aporx. 4mb to 12mb when I expand and scroll through all the items. Let me know thanks. This is my code. XAML: <Window x:Class="RadTreeViewExpandedProblem.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"> <Grid> <TreeView x:Name="treeView" VirtualizingStackPanel.IsVirtualizing="True" VirtualizingStackPanel.CleanUpVirtualizedItem="TreeView_CleanUpVirtualizedItem"> <TreeView.ItemsPanel> <ItemsPanelTemplate> <VirtualizingStackPanel /> </ItemsPanelTemplate> </TreeView.ItemsPanel> </TreeView> </Grid> </Window> C#: public partial class Window1 : Window { public Window1() { InitializeComponent(); TreeViewItem rootItem = new TreeViewItem() { Header = "Item Level 0" }; for (int i = 0; i < 1000; i++) { TreeViewItem itemLevel1 = new TreeViewItem() { Header = "Item Level 1" }; itemLevel1.Items.Add(new TreeViewItem()); rootItem.Items.Add(itemLevel1); } treeView.Items.Add(rootItem); } private void TreeView_CleanUpVirtualizedItem(object sender, CleanUpVirtualizedItemEventArgs e) { } }

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• WPF 3.5 WebBrowser control and ZIndex

  - by emsieja

  I'm trying to figure out why the control does not honor ZIndex. Example 1 - which works fine <Canvas> <Rectangle Canvas.ZIndex="1" Height="400" Width="600" Fill="Yellow"/> <Rectangle Canvas.ZIndex="2" Height="100" Width="100" Fill="Red"/> </Canvas> Example 2 - which does not work <Canvas> <WebBrowser Canvas.ZIndex="1" Height="400" Width="600" Source="http://www.stackoverflow.com"/> <Rectangle Canvas.ZIndex="2" Height="100" Width="100" Fill="Red"/> </Canvas> Thanks, -- Ed

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• In WPF: Children.Remove or Children.Clear doesn't free objects

  - by Bart Roozendaal

  I create some UIElements from code behind and was anticipating the garbage collection to clear up stuff. However, the objects are not free-ed at the time I expected it. I was expecting them to be freeed at RemoveAt(0), but they are only freed at the end of the program. How can I make the objects be freed when removed from the Children collection of the Canvas? <Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300" MouseDown="Window_MouseDown"> <Grid> <Canvas x:Name="main" /> </Grid> </Window> The code behind is: public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private void Window_MouseDown(object sender, MouseButtonEventArgs e) { if (main.Children.Count == 0) main.Children.Add(new MyControl() { Background = Brushes.Yellow, Width = 100, Height = 50 }); else main.Children.RemoveAt(0); } } public class MyControl : UserControl { ~MyControl() { Debug.WriteLine("Goodbye"); } }

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• WPF Treeview contextmenu IsChecked binding MVVM

  - by BrettRobi

  I've got a TreeView to which I associate a ContextMenu. That contextmenu has an item whose IsChecked property I want to bind to my ViewModel. Since I am using a tree each treeitem is bound to a subproperty of my ViewModel. In the VS2010 output window I am seeing this databinding error: BindingExpression path error: 'IsAutoStart' property not found on 'object' ''HostMgmtViewModel' (HashCode=12565727)'. BindingExpression:Path=IsAutoStart; DataItem='HostMgmtViewModel' This clearly shows it is trying to bind to my ViewModel and not to the treeitem's associated data. How do I bind to the correct object? Remember my contextmenu is associated with the whole TreeView not to the specific treeitem.

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• WPF TreeView similar to Organizational chart with connecting lines

  - by Priya

  I have modified my treeview to look like an Org chart using the example shown in the Code Project website (Author Josh Smith). I need connecting lines in the treeview to make it look exact to org chart. I found references pointing to the below site http://wpfblog.info/2008/05/26/turning-a-treeview-into-an-org-chart-with-connectors/ But I am not able to view the content. Probably the webpage has been moved. Can anybody help?

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• [WPF] Custom TabItem in TabControl

  - by Simon

  I've created CustomTabItem which inherits from TabItem and i'd like to use it while binding ObservableCollection in TabControl <TabControl ItemsSource="{Binding MyObservableCollection}"/> It should like this in XAML, but i do not know how change default type of the output item created by TabControl while binding. I've tried to create converter, but it has to do something like this inside convertin method: List<CustomTabItem> resultList = new List<CustomTabItem>(); And iterate through my input ObservableCollection, create my CustomTab based on item from collection and add it to resultList... I'd like to avoid it, bacause while creating CustomTabItem i'm creating complex View and it takes a while, so i don't want to create it always when something change in binded collection. My class extends typical TabItem and i'd like to use this class in TabControl instead of TabItem. <TabControl.ItemContainerStyle> <Style TargetType="{x:Type local:CustomTabItem}"> <Setter Property="MyProperty" Value="{Binding xxx}"/> </Style> </TabControl.ItemContainerStyle> Code above generates error that Style cannot be applied to TabItem. My main purpose is to use in XAML my own CustomTabItem and bind properties... Just like above... I've also tried to use <TabControl.ItemTemplate/> <TabControl.ContentTemaplte/> But they are just styles for TabItem, so i'll still be missing my properties wchich i added in my custom class.

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• Setting a WPF ContextMenu's PlacementTarget property in XAML?

  - by qntmfred

  <Button Name="btnFoo" Content="Foo" > <Button.ContextMenu Placement="Bottom" PlacementTarget="btnFoo"> <MenuItem Header="Bar" /> </Button.ContextMenu> </Button> gives me a runtime error 'UIElement' type does not have a public TypeConverter class I also tried <Button Name="btnFoo" Content="Foo" > <Button.ContextMenu Placement="Bottom" PlacementTarget="{Binding ElementName=btnFoo}"> <MenuItem Header="Bar" /> </Button.ContextMenu> </Button> and that put the ContextMenu in the top left corner of my screen, rather than at the Button

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• Disable WPF label accelerator key (text underscore is missing)

  - by Richard Morgan

  I am setting the .Content value of a Label to a string that contains underscores; the first underscore is being interpreted as an accelerator key. Without changing the underlying string (by replacing all _ with __), is there a way to disable the accelerator for Labels?

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• Clip a wpf Popup at bounds of a main window

  - by BrandonS

  From what I understand, the popup exists within it's own visual tree. However, I've noticed a few properties, Clip and ClipToBounds. What I am wanting to do is Visually clip a popup at the right and bottom edges of a window regardless of the fact that the popup is independent of the bounds of the window. I'm not using XAML, but if somebody knows how to do it in XAML, then that's fine. I can get to the main window using System.Windows.Application.Current.MainWindow. Is it possible from this to get a value that I can use to clip the popup? I'm assuming that if there is a value that I can use, then I would be able to bind the clipping of the popup to that value. This is really not necessary since after the popup initially opens, if the window gets moved or resized, the popup closes. So I would really only need to clip the popup when it opens. The reason I would like to do this is because although I am using a popup, I don't want it to appear as a popup that exists outside of the window. FYI this is for a popup calendar for a custom datebox. Any ideas, as well as clarification of misconceptions that I may have, would be greatly appreciated. Thanks, Brandon

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• Scroll Viewer not visible in wpf DataGrid

  - by cre-johnny07

  I have a datagrid in a grid but the scrollviewer is not visibile even though I made it auto. Below in my code. I can't figure out where's the problem. <Grid Grid.Row="0" Grid.Column="0"> <Grid.RowDefinitions> <RowDefinition Height="Auto" ></RowDefinition> <RowDefinition Height="Auto" ></RowDefinition> <RowDefinition Height="Auto" ></RowDefinition> <RowDefinition Height="Auto" ></RowDefinition> <RowDefinition Height="Auto" ></RowDefinition> <RowDefinition Height="Auto" ></RowDefinition> <RowDefinition Height="Auto" ></RowDefinition> <RowDefinition Height="Auto" ></RowDefinition> <RowDefinition Height="Auto"></RowDefinition> <RowDefinition Height="Auto"></RowDefinition> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"></ColumnDefinition> <ColumnDefinition Width="Auto"></ColumnDefinition> </Grid.ColumnDefinitions> <TextBlock Text="Doctor Name" Grid.Row="0" Grid.Column="0" Margin="5,5,0,0"/> <TextBlock Text="Doctor Address" Grid.Row="1" Grid.Column="0" Margin="5,5,0,0"/> <TextBlock Text="Entry Note" Grid.Row="2" Grid.Column="0" Margin="5,5,0,0"/> <TextBlock Text="Join Date" Grid.Row="3" Grid.Column="0" Margin="5,5,0,0"/> <TextBlock Text="Default Discount" Grid.Row="4" Grid.Column="0" Margin="5,5,0,0"/> <TextBlock Text="Discount Valid Till" Grid.Row="5" Grid.Column="0" Margin="5,5,0,0"/> <TextBlock Text="Employee Name" Grid.Row="6" Grid.Column="0" Margin="5,5,0,0"/> <Grid Grid.Row="7" Grid.Column="0" Grid.ColumnSpan="2"> <Grid.ColumnDefinitions> <ColumnDefinition></ColumnDefinition> <ColumnDefinition></ColumnDefinition> <ColumnDefinition></ColumnDefinition> </Grid.ColumnDefinitions> <TextBlock Text="Report Type" Grid.Row="0" Grid.Column="0" Margin="5,5,0,0"/> <ComboBox Grid.Row="0" Grid.Column="1" Name="cmbReportType" Text="{Binding CurrentEntity.ReportType}"/> <Button Grid.Row="0" Grid.Column="2" Name="btnAddDetail" Content="Add Details" Command="{Binding AddDetailsCommand}"/> </Grid> <TextBox Grid.Row="0" Grid.Column="1" Margin="5,5,0,0" Width="190" Name="txtDocName" Text="{Binding CurrentEntity.RefName}"/> <TextBox Grid.Row="1" Grid.Column="1" Margin="5,5,0,0" Width="190" Height="75" Name="txtDocAddress" Text="{Binding CurrentEntity.RefAddress}"/> <TextBox Grid.Row="2" Grid.Column="1" Margin="5,5,0,0" Width="190" Height="100" Name="txtEntryNote" Text="{Binding CurrentEntity.EntryNotes}"/> <Custom:DatePicker Grid.Row="3" Grid.Column="1" Margin="5,3,0,0" Width="125" Name="dtpJoinDate" Height="24" HorizontalAlignment="Left" VerticalAlignment="Top" SelectedDate="{Binding CurrentEntity.DateStarted}" SelectedDateFormat="Short"/> <TextBox Grid.Row="4" Grid.Column="1" Height="25" Width="75" Name="txtDefaultDiscount" HorizontalAlignment="Left" Margin="5,0,0,0" VerticalAlignment="Top" Text="{Binding CurrentEntity.DefaultDiscount}"/> <Custom:DatePicker Grid.Row="5" Grid.Column="1" Margin="5,3,0,0" Width="125" Name="dtpValidTill" Height="24" HorizontalAlignment="Left" VerticalAlignment="Top" SelectedDate="{Binding CurrentEntity.DefaultDiscountValidTill}" SelectedDateFormat="Short"/> <ComboBox Grid.Row="6" Grid.Column="1" Margin="5,3,0,0" Width="190" Height="30" Name="cmbEmployeeName" ItemsSource="{Binding Employees}" DisplayMemberPath="FullName" SelectedIndex="{Binding SelecteIndex}"> </ComboBox> <Custom:DataGrid Grid.Row="8" Grid.Column="0" Grid.ColumnSpan="2" ItemsSource="{Binding XYZ}" AutoGenerateColumns="False" Name="grdTestDept"> <Custom:DataGrid.Columns> <Custom:DataGridTextColumn Binding="{Binding dep_id}" Width="40" Header="ID"/> <Custom:DataGridTextColumn Binding="{Binding dep_name}" Width="125" Header="Name"/> <Custom:DataGridTextColumn Binding="{Binding default_data}" Width="100" Header="Default Data"/> </Custom:DataGrid.Columns> </Custom:DataGrid> </Grid> <Grid Grid.Row="0" Grid.Column="1" Grid.RowSpan="9"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" MinWidth="43"></ColumnDefinition> <ColumnDefinition Width="Auto" MinWidth="150"></ColumnDefinition> <ColumnDefinition Width="Auto" MinWidth="50"></ColumnDefinition> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="34*" ></RowDefinition> <RowDefinition Height="337.88*"></RowDefinition> </Grid.RowDefinitions> <TextBlock Text="Name: " Grid.Row="0" Grid.Column="0" Margin="5,4,0,0" /> <cc:ValueEnabledCombo Grid.Column="1" x:Name="cmbfilEmployeeName" Width="150" Height="30" Margin="5,4,0,0" VerticalAlignment="Top" SelectedIndex="0" ItemsSource="{Binding Employees}" DisplayMemberPath="FullName" SelectedValuePath="EmployeeId" cc:ValueEnabledCombo.SelectionChanged="{Binding SelectionChangedCommand}"> </cc:ValueEnabledCombo> <Button Grid.Column="2" Name="btnReport" Width="50" Content="Report" Height="28" Margin="5,4,0,0" Command="{Binding ReportCommand}" VerticalAlignment="Top" /> <Grid Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="3"> <Custom:DataGrid ItemsSource="{Binding DoctorList}" AutoGenerateColumns="False" Name="grdDoctor" ScrollViewer.HorizontalScrollBarVisibility="Auto" ScrollViewer.VerticalScrollBarVisibility="Auto"> <Custom:DataGrid.Columns> <Custom:DataGridTextColumn Binding="{Binding RefName}" Width="Auto" Header="Doctor Name"/> <Custom:DataGridTextColumn Binding="{Binding EmployeeFullName}" Width="Auto" Header="Employee Name"/> </Custom:DataGrid.Columns> </Custom:DataGrid> </Grid> </Grid> </Grid>

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• Smooth text animation (Marquee) using WPF

  - by Goran

  Trying to build a marquee control with smooth text animation. Current efforts include: Using translate transform Using animation on Canvas dependency properties (Left, Right) Using animation on custom dependency property (Point) and using drawing visuals (formattedtext) Using CompositionTarget.Rendering But the animation is still choppy and resource intensive. Checklist: Confirmed no software rendering is taking place (ms performance tool and checking RenderCapability.Tier) Calling freeze on any imaginable object Running app on dual core machine with decent graphic card (NVidia 9600) Disabled any bitmap effect and transparency Checked all marquee controls out there (same issues) Any ideas (or better yet code example)?

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• WPF: Master - detail view with two datagrids and in MVVM

  - by EV

  Hi, I'm trying to write a master - detail control that consists of a master datagrid and the detail datagrid. My scenario was following - I used the SelectedItem and bound it to a property in ModelView. The problem is - the SelectedItem in ViewModel is never used, so I can't get the information which item is selected in a master datagrid and cannot fetch the data for thos selection. The code is below: <toolkit:DataGrid ItemsSource="{Binding}" RowDetailsVisibilityMode="VisibleWhenSelected" SelectedItem="{Binding SelectedItemHandler, Mode=TwoWay}"></toolkit:DataGrid> And in ViewModel private CustomerObjects _selectedItem; public CustomerObjects SelectedItemHandler { get { return _selectedItem; } set { OnPropertyChanged("SelectedItem"); } } The code in SelectedItemHandler is never used. What could be the problem? Should I use another approach to create master - detail in MVVM?

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• WPF: Asynchronous progress bar

  - by SumGuy

  I'm trying to create a progress bar that will work asynchronously to the main process. I'm created a new event and invoked it however everytime I then try to perform operations on the progress bar I recieve the following error: "The calling thread cannot access this object because a different thread owns it" The following code is an attempt to send an instance of the progress bar to the event as an object, it obviously failed but it gives you an idea of what the code looks like. private event EventHandler importing; void MdbDataImport_importing(object sender, EventArgs e) { ProgressBar pb = (ProgressBar)sender; while (true) { if (pb.Value >= 200) pb.Value = 0; pb.Value += 10; } } private void btnImport_Click(object sender, RoutedEventArgs e) { importing += new EventHandler(MdbDataImport_importing); IAsyncResult aResult = null; aResult = importing.BeginInvoke(pbDataImport, null, null, null); importing.EndInvoke(aResult); } Does anyone have ideas of how to do this. Thanks in advance SumGuy.

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• WPF: Filter TreeView without collapsing it's nodes

  - by Julian Lettner

  This one is a follow-up question. I filter the top level nodes of a TreeView control like shown below. private void ApplyFilterHandler(object sender, RoutedEventArgs e) { if (_filterCheckBox.IsChecked.Value) CollectionViewSource.GetDefaultView(TopLevelNodes).Filter += MyFilter; else CollectionViewSource.GetDefaultView(TopLevelNodes).Filter -= MyFilter; } . <TreeView ItemsSource="{Binding TopLevelNodes}"> ... </TreeView> When the user applies the filter all nodes get collapsed. Question How can I hide certain nodes in a tree while retaining the expand state of the other nodes? Can someone explain, what happens internally on ICollectionView.Filter += MyFilter. Thanks for your time.

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• Add collection or array to wpf resource dictionary

  - by Chris Cap

  I've search high and low and can't find an answer to this. I have two questions How do you create an array or collection in XAML. I've got an array I want to stick in there and bind to a combo box. My first idea was to put an ItemsControl in a resource dictionary, but the ItemsSource of a combo box expects IEnumerable so that didn't work. Here's what I've tried in my resource dictionary and neither works <ItemsControl x:Key="stateList"> <sys:String>AL</sys:String> <sys:String>CA</sys:String> <sys:String>CN</sys:String> </ItemsControl> <ItemsControl x:Key="stateList2"> <ComboBoxItem>AL</ComboBoxItem> <ComboBoxItem>CA</ComboBoxItem> <ComboBoxItem>CN</ComboBoxItem> </ItemsControl> and here's how I bind to it <ComboBox SelectedValue="{Binding Path=State}" ItemsSource="{Binding Source={StaticResource stateList2}}" > </ComboBox> EDIT: UPDATED I got this first part to work this way <col:ArrayList x:Key="stateList3"> <sys:String>AL</sys:String> <sys:String>CA</sys:String> <sys:String>CN</sys:String> </col:ArrayList> However, I'd rather not use an array list, I'd like to use a generic list so if anyone knows how please let me know. EDIT UPDATE: I guess XAML has very limited support for generics so maybe an array list is the best I can do for now, but I would still like help on the second question if anyone has an anser 2nd. I've tried referencing a merged resource dictionary in my XAML and had problems because under Window.resources I had more than just the dictionary so it required me to add x:Key. Once I add the key, the system can no longer find the items in my resource dictionary. I had to move the merged dictionary to Grid.Resources instead. Ideally I'd like to reference the merged dictionary in the app.xaml but I have the same problem Here's some sample code. This first part required an x:key to compile because I have converter and it complained that every item must have a key if there is more than one <UserControl.Resources> <win:BooleanToVisibilityConverter x:Key="VisibilityConverter" /> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="/ResourcesD.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </UserControl.Resources> I had to change it to this <UI:BaseStep.Resources> <win:BooleanToVisibilityConverter x:Key="VisibilityConverter" /> </UI:BaseStep.Resources> <Grid> <Grid.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="/ResourcesD.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Grid.Resources> </Grid> Thank you

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• Access to bound data in IMultiValueConverter.ConvertBack() in C#/WPF

  - by absence

  I have a problem with a multibinding: <Canvas> <local:SPoint x:Name="sp" Width="10" Height="10"> <Canvas.Left><!-- irrelevant binding here --></Canvas.Left> <Canvas.Top> <MultiBinding Converter="{StaticResource myConverter}" Mode="TwoWay"> <Binding ElementName="cp1" Path="(Canvas.Top)"/> <Binding ElementName="cp1" Path="Height"/> <Binding ElementName="cp2" Path="(Canvas.Top)"/> <Binding ElementName="cp2" Path="Height"/> <Binding ElementName="sp" Path="Height"/> <Binding ElementName="sp" Path="Slope" Mode="TwoWay"/> </MultiBinding> </Canvas.Top> </local:SPoint> <local:CPoint x:Name="cp1" Width="10" Height="10" Canvas.Left="20" Canvas.Top="150"/> <local:CPoint x:Name="cp2" Width="10" Height="10" Canvas.Left="100" Canvas.Top="20"/> </Canvas> In order to calculate the Canvas.Top value, myConverter needs all the bound values. This works great in Convert(). Going the other way, myConverter should ideally calculate the Slope value (Binding.DoNothing for the rest), but it needs the other values in addition to the Canvas.Top one passed to ConvertBack(). What is the right way to solve this? I have tried making the binding OneWay and create an additional multibinding for local:SPoint.Slope, but that causes infinite recursion and stack overflow. I was thinking the ConverterParameter could be used, but it seems like it's not possible to bind to it.

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• WPF MenuItem IsChecked Binding not working

  - by Kaya

  Anyone know why the menu item binding does not work ? <ToggleButton Name="toggleButton" Checked="checkBoxPublish_Checked" > <ToggleButton.Resources> <converters:BooleanToHiddenVisibility x:Key="boolToVis"/> </ToggleButton.Resources> <Grid> <Image Height="auto" HorizontalAlignment="Left" Margin="5" Name="image1" Stretch="Fill" VerticalAlignment="Top" Width="auto" /> <Viewbox > <TextBlock Text="Blocked" Opacity="0.7" Foreground="Red" Visibility="{Binding Path=IsChecked, ElementName=toggleButton, Converter={StaticResource boolToVis}}"/> </Viewbox> </Grid> <ToggleButton.ContextMenu> <ContextMenu StaysOpen="True" > <MenuItem x:Name="menuItemBlock" Header="Block" Click="menuItemClick" IsCheckable="True" IsChecked="{Binding ElementName=toggleButton, Path=IsChecked}"/> <MenuItem x:Name="menuItemIgnorePtz" Header="Ignore Ptz" Click="menuItemClick" IsCheckable="True" /> </ContextMenu> </ToggleButton.ContextMenu> </ToggleButton>

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• Paragraph formatting in a WPF RichTextBox?

  - by David Veeneman

  I need to apply paragraph formatting to a selection in a rich text box. My RTB will behave the same way as the rich text boxes on StackOverflow--the user can type text into the RTB, but they can also enter code blocks. The RTB will apply very simple formatting to the code block--it will change the font and apply a background color to the entire block, similar to what you see in the code block below. Changing the font is pretty straightforward: var textRange = new TextRange(rtb.Selection.Start, rtb.Selection.End); textRange.ApplyPropertyValue(TextElement.FontFamilyProperty, "Consolas"); textRange.ApplyPropertyValue(TextElement.FontSizeProperty, 10D ); Now I need to apply some paragraph-level formatting. I need to set the paragraph margin to 0, so I don't get a blank line between code lines, and I need to set the paragraph background color. Here's my problem: I can't figure out how to get the paragraph elements from the selection, so that I can apply formatting. Any suggestions? An example of how to apply the Margin and Background properties would be incredibly helpful. Thanks!

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• WPF: DataGrid Cell Double-click

  - by Jonathan Allen

  Is there a better way than this to determine the row a user double-clicked on in a data-grid? Private Sub ResultsGrid_MouseDoubleClick(ByVal sender As System.Object, ByVal e As System.Windows.Input.MouseButtonEventArgs) Dim node As DependencyObject = CType(e.OriginalSource, DependencyObject) Do Until TypeOf node Is Microsoft.Windows.Controls.DataGridRow OrElse node Is Nothing node = VisualTreeHelper.GetParent(node) Loop If node IsNot Nothing Then Dim data = CType((CType(node, Microsoft.Windows.Controls.DataGridRow)).DataContext, Customer) 'do something End If End Sub

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• Create ControlTemplate programmatically in wpf

  - by Thomas Stock

  Hi, How can I programmatically set a button's template? Polygon buttonPolygon = new Polygon(); buttonPolygon.Points = buttonPointCollection; buttonPolygon.Stroke = Brushes.Yellow; buttonPolygon.StrokeThickness = 2; // create ControlTemplate based on polygon ControlTemplate template = new ControlTemplate(); template.Childeren.Add(buttonPolygon); // This does not work! What's the right way? //create button based on controltemplate Button button = new Button(); button.Template = template; So I need a way to set my Polygon as the button's template.. Suggestions? Thanks.

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• WPF Delay Refresh of UI Elements in ItemsControl

  - by Wonko the Sane

  Hello All, The short question is - how can I prevent (delay) a bound UI element from refreshing until I want it to? The longer explanation: I have a process that adds a number of items to an ItemsControl, and then performs some additional calculations on those items using a background thread. This (correctly) updates the items as it goes along. However, I would like to prevent the ItemsControl from updating during a particular calculation, as it performs some reordering of the items before it does additional calculations based on that order, and then returns the items to their original order. I do show a "Please Wait" animation on top of the ItemsControl, with the ItemsControl dimmed down as it is working, but I'd rather not hide the ItemsControl entirely because it gives the user an indication that progress is being made. Thanks, wTs

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• WPF performance : Converters vs. Triggers

  - by Joachim Kerschbaumer

  hi there, i´m currently facing a problem where i have to set properties on a bunch of framework elements depending on some other properties. i wonder how triggers and converters compare when it comes to performance. Especially MultiTriggers and IMultiValueConverters. Is there any difference? google wasn't helpful so i thought maybe some of the guys over here at SO could bring in some light. thanks, j.

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• wpf DataGrid.datagridtemplatecolumn combobox does not update itemssource

  - by David

  <Grid Loaded="Grid_Loaded"> <DataGrid Margin="10,10,10,162" x:Name="dataGrid1" ItemsSource="{Binding myItemsSource}"/> <DataGrid Margin="10,164,10,10" x:Name="dataGrid2" ItemsSource="{Binding myItemsSource}" AutoGenerateColumns="False"> <DataGrid.Columns> <DataGridTextColumn Header="A" Binding="{Binding A}"></DataGridTextColumn> <DataGridComboBoxColumn Header="B" TextBinding="{Binding B}" x:Name="columnB"></DataGridComboBoxColumn> <DataGridTemplateColumn Header="C" x:Name="columnC"> <DataGridTemplateColumn.CellTemplate> <DataTemplate> <ComboBox Text="{Binding C, Mode=TwoWay}" SelectedItem="{Binding C, Mode=TwoWay}"> <ComboBoxItem Content="AAA"/> <ComboBoxItem Content="BBB"/> <ComboBoxItem Content="CCC"/> <ComboBoxItem Content="XXX"/> <ComboBoxItem Content="YYY"/> <ComboBoxItem Content="ZZZ"/> </ComboBox> </DataTemplate> </DataGridTemplateColumn.CellTemplate> </DataGridTemplateColumn> </DataGrid.Columns> </DataGrid> columnB (buidin DataGridComboBoxColumn) is working. columnB.ItemsSource = LstForCbx; public List LstForCbx = new List{"AAA", "BBB", "CCC", "XXX", "YYY", "ZZZ"}; columnC combobox in DataGridComboBoxColumn not working. What wrong with my code?

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