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• WPF: How to dynamically find a usercontrol or datatemplate

  - by Elger

  I have a bunch of datatemplates I use to display various sql-views in an ItemsControl. I don't know which datatemplate i'm going to use until run-time. (every view has different columns) Next to that, I made a generic dynamic datatemplate for all those views that don't need anything special. When I display the view I want to first look in all the available datatemplates if there is one that matches, else use the default dynamic datatemplate. My question is how can I 'search' a datatemplate by name in code? Usercontrol is also possible. Thanks, Elger

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• Horrible WPF performance!

  - by Erik

  Why am i using over 80% CPU when just hovering some links? As you can see in the video i uploaded: http://www.youtube.com/watch?v=3ALF9NquTRE the CPU goes to 80% CPU when i move my mouse over the links. My style for the items are as follows <Style x:Key="LinkStyle" TargetType="{x:Type Hyperlink}"> <Style.Triggers> <Trigger Property="IsMouseOver" Value="True"> <Setter Property="Foreground" Value="White" /> </Trigger> </Style.Triggers> <Setter Property="TextBlock.TextDecorations" Value="{x:Null}" /> <Setter Property="Foreground" Value="#FFDDDDDD"/> <Setter Property="Cursor" Value="Arrow" /> </Style> Why?

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• WPF - Drag from withing DataTemplate

  - by Gustavo Cavalcanti

  I have a ListBox displaying employees with a DataTemplate - it looks very similar to this screenshot. I want to be able to click on the employee photo, drag it and drop it somewhere out of the ListBox. How can I do that? I am not sure how to capture the PreviewMouseLeftButtonDown event of the Image, since it's inside the DataTemplate. Edit: The DataTemplate lives in a separate assembly and the drag/drop logic needs to be in the Window that has the ListBox. Edit2: I am thinking that the right way of doing this is using commands, am I right? Thanks!

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• WPF Binding.Stringformat ignored

  - by John

  With .NET 3.5 SP 1 I checked out this blog and followed instructions, however the StringFormat parameter still gets ignored. Any possible reasons? To be sure: the datatype that are involved are DateTime, double, int. So the formatting SHOULD work, but it's not. Any clues why?

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• WPF - Binding a color resource to the data object within a DataTemplate

  - by John

  I have a DataTemplate and a SolidColorBrush in the DataTemplate.Resources section. I want to bind the color to a property of the same data object that the DataTemplate itself is bound to. However, this does not work. The brush is ignored. Why? <DataTemplate DataType="{x:Type data:MyData}" x:Name="dtData"> <DataTemplate.Resources> <SolidColorBrush x:Key="bg" Color="{Binding Path=Color, Converter={StaticResource colorConverter}" /> </DataTemplate.Resources> <Border CornerRadius="15" Background="{StaticResource bg}" Margin="0" Opacity="0.5" Focusable="True"> </DataTemplate>

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• WPF DataGrid: How to get Converter

  - by Nike

  I create DataGrid Columns with Binding (where i is a Int value): dataGrid.Columns.Add(new DataGridTextColumn { Header = i.ToString(), Binding = CreateBinding(i), }); private Binding CreateBinding(int num) { Binding bind = new Binding(string.Format("[{0}]", num)); bind.Converter = new CellValueConverter(); return bind; } In the CreateBinding method I have an access to bind.Converter property. I need to call Converter.Convert() method in some handler, but there is no Converter property when I try to access it: (dataGrid.Columns[clm] as DataGridTextColumn).Binding."no Converter property!" How can I get my CellValueConverter which was created for particular Column?

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• WPF DataValidation on a DataTemplate object in an ItemsControl

  - by Matt H.

  I have two datatemplates, both very similar... here is one of them: <DataTemplate x:Key="HeadingTemplate"> <Grid x:Name="mainHeadingGrid" Margin="5,5,30,0" HorizontalAlignment="Stretch"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition /> </Grid.ColumnDefinitions> <TextBlock Grid.Column="1" Margin="30,3,10,0" Foreground="Black" FontWeight="Bold" HorizontalAlignment="Left" TextWrapping="Wrap"> <TextBlock.Text> <MultiBinding Converter="{StaticResource myHeadingConverter}" ConverterParameter="getRNHeadingTitle" Mode="TwoWay"> <Binding Path="num"/> <Binding Path="name"/> </MultiBinding> </TextBlock.Text> </TextBlock> <TextBox Grid.Column="1" Text="{Binding Path=moreInfo}"/> </Grid> </DataTemplate> I use an selector in my ItemsControl to choose between the two, based on the object it is bound to. I want to use validation to check through all of the properties and put a big exclamation point in front of the whole datatemplate as it is displayed in the itemscontrol. how do I do this? All of the examples I've found explain how to set a ValidationRule on a specific control in the datatemplate, in that control's binding. I want to apply my validation rule to the entire template... Help! :)

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• WPF: LineBreak enable/disable dynamically

  - by Sonic Soul

  i would like to make the LineBreak element inside of that TextBlock controllable by the user in preferences to Enable/Disable it being there <TextBlock Style="{StaticResource TextBlockStyle}" Width="130"> <TextBlock.Inlines> <Run Text="{Binding Path=Name}" FontWeight="Bold" Foreground="#FF2A4D9E" /> <Run Text="{Binding Path=Price}" FontWeight="Bold" /> <LineBreak /> <Run Text="{Binding Path=Quantity}" Foreground="#99000000" /> </TextBlock.Inlines> </TextBlock>

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• Re-using Buttons in WPF

  - by Alex Marshall

  I have a bunch of different objects that are commonly edited in the same TabControl using different DataTemplates, but I want each DataTemplate to have a common look and feel with Ok and Cancel buttons at the bottom right of each tab that will close the tab or save the content and then close the currently selected tab. What's the best way to place buttons on each tab ? Is there a way to do it without copying and pasting the buttons and stack panel across all of my data templates ?

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• [WPF]ItemsControl not completely loaded @Loaded event

  - by Kaare

  Hi everyone I have a propably simple problem, that i just can't seem to figure out: I've made an ItemsControl which has its datacontext set and shows the data as pairs of Checkboxes and TextBlocs: <ItemsControl Name="listTaskTypes" Grid.Row="1" Grid.Column="2" Grid.RowSpan="2" ItemsSource="{Binding}" Margin="10,0,0,0" VerticalAlignment="Top" Loaded="listTaskTypes_Loaded"> <ItemsControl.ItemTemplate> <DataTemplate> <StackPanel Orientation="Horizontal"> <CheckBox Name="checkBoxTypeId" Tag="{Binding Path=TaskTypeID}"/> <TextBlock FontSize="11pt" FontFamily="Helvetica" Text="{Binding Path=Text}" /> </StackPanel> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> My problem is that in the Loaded event of the ItemsControl, the checkboxes does not exist yet. How can i get an event when the ItemsControl is completely loaded or is this not possible?

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• list box items context menu WPF

  - by Eran

  hey guys, I have list box that contains UserControl as item template the user control contains few text blocks in a grid, the thing is that I want to add context menu to my user control that will show on the list item right click but currently only right clicking the textbox inside the user control triggers the context menu appearance clicking the spaces between those textboxes triggers nothing, any idea about how can I trigger the context menu from the container list box? Thanks Eran

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• WPF How to stop animation from a thread in background worker

  - by toni

  Hi! I have a task that takes a long time. I do it with a background worker thread and before start it, since Do_Work I begin an animation over a label and when task finishes, I stop it in RunWorkerCompleted but I received an error because I try to begin/stop animation in the background thread that is not the owner. How can I do this, I mean to begin/stop animation in the background worker? thanks!

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• WPF: How to get the event when one FrameworkElement comes in contact with other FrameworkElement

  - by Raghav

  I am developing a small application with images and trash box icon on right hand bottom. I have multiple images floating in the main window, and using mouse I can move image from one corner to other corner of window, left, right, top and bottom. I can't figure out how do I catch an event when a image touches and panel (with trash box image), in the right hand corner. Does anybody knows which event or handler to listen? This is not a drag and drop case since my images are floating so no point using drag and drop. Thank you

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• Issue with child of custom Decorator class in WPF

  - by galacticgrug

  I need a custom border that renders a little differently than a normal border. I made a class that inherited from Decorator as follows class BetterBorder : Decorator { protected override Size ArrangeOverride(Size arrangeSize) { return arrangeSize; } protected override void OnRender(DrawingContext dc) { //these values are calculated elsewhere dc.DrawGeometry(backgroundBrush, borderPen, pathGeometry); } } //Properties and helper methods below this All of this works fine until I try to add a child to the control, the control can be added but is not visible and seems to be moved off BetterBorders visible client area. If I inherit from Border everything works fine, what am I missing?

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• Showing a tooltip on a combobox from the itemtemplate (WPF)

  - by Jamie

  I have a ComboBox with a DataTemplate. The DataTemplate has two controls, each of which has a ToolTip attached to it. The list of items of the ComboBox has the tooltips as expected when you hover over each control. But the selected item area on top of the ComboBox does not display the tooltips, though the controls are rendered as expected. Is there a way to force the tooltips to be displayed?

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• WPF DataTemplate - Overlay

  - by David Ward

  I have a class that I need to provide the datatemplate for. Currently I have two datatemplates, one for when Enabled == true and one for when Enabled == false. The datatemplate for the class is actually the one below which changes the template used based on a trigger: <DataTemplate x:Key="ActionNodeTemplateSelector"> <ContentPresenter Content="{Binding}" Name="cp" /> <DataTemplate.Triggers> <DataTrigger Binding="{Binding Enabled}" Value="True"> <Setter TargetName="cp" Property="ContentTemplate" Value="{StaticResource ActionNodeTemplate}" /> </DataTrigger> <DataTrigger Binding="{Binding Enabled}" Value="False"> <Setter TargetName="cp" Property="ContentTemplate" Value="{StaticResource ActionNodeDisabledTemplate}" /> </DataTrigger> </DataTemplate.Triggers> </DataTemplate> This all works well. However, now I want to also display an image overlay if the "Completed" property is true and a different image if it is incomplete. I could easily carry on using my approach to trigger on the Completed property as well but this would double the number of templates and feels wrong. Is there a way that I could have a trigger on my DataTemplate that will allow me to overlay the correct image over the existing template which is based on the Enabled property?

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• WPF layout with several fixed height parts and certain parts relative to window size

  - by Daniil Harik

  Hello, At moment my main layout consists of vertically oriented stack panel and it looks like this: Root StackPanel StackPanel - fixed Height 150 (horizontal orientation) StackPanel - relative Height must be behalf of free space left on screen (but at least 150 px). Used by Telerik GridView Control, if I don't specify Height or MaxHeight Telerik GridView Height becomes very large and does not fit my window. StackPanel - fixed Height 100 (horizontal orientation) StackPanel - relative Height must be half of free space left on screen (but at least 150 px). Used by Telerik GridView Control, if I don't specify Height or MaxHeight Telerik GridView Height becomes very large and does not fit my window. StackPanel - fixed Height 100 (horizontal orientation) The view must totally fit available screen size. The problem is that I don't understand how to make certain areas of my view resize depending on available screen size. Is there is easy way to solve it, or should I be binding to Window height property and doing math? Thank You very much!

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• wpf datagrid extra column in header on left

  - by sb

  I keep getting this button in the header, I can click on the button to select all rows. This misaligns the data from the header. Any ideas? Thanks in Advance. Datagrid image via link: http://picasaweb.google.com/lh/photo/CahvlINknhL5ykIW2zCfIw?feat=directlink <dg:DataGrid.Columns> <dg:DataGridTextColumn Header="Description" Width=".5*" Binding="{Binding Description}"> </dg:DataGridTextColumn> <dg:DataGridTextColumn Header="Type" Width="100" Binding="{Binding Type}"> </dg:DataGridTextColumn> <dg:DataGridTextColumn Header="Amount $" Width="100" Binding="{Binding Amount}"> </dg:DataGridTextColumn> <dg:DataGridTextColumn Header="Effective From Date" Width="100" Binding="{Binding EffectiveFromDate}" IsReadOnly="True"> </dg:DataGridTextColumn> <dg:DataGridTextColumn Header="Effective To Date" Width="100" Binding="{Binding EffectiveToDate}" IsReadOnly="True"> </dg:DataGridTextColumn> <dg:DataGridTextColumn Header="Status" Width="100" Binding="{Binding Status}"> </dg:DataGridTextColumn> </dg:DataGrid.Columns>

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• WPF multitrigger referencing 2 other controls

  - by BrettRobi

  I have two CheckBoxes and a TextBox. I want to TextBox to have IsEnabled=False if both CheckBoxes have IsChecked=False. Can I do this with a MultiTrigger? I keep getting errors trying to use the Source property. I have it working with MultiDataTriggers as you can see below. But have two questions. 1) Is this my only choice? Can I do it with a MultiTrigger? <TextBox.Style> <Style TargetType="TextBox"> <Style.Triggers> <MultiDataTrigger> <MultiDataTrigger.Conditions> <Condition Binding="{Binding ElementName=uxDmm , Path=IsChecked}" Value="False" /> <Condition Binding="{Binding ElementName=uxGpm , Path=IsChecked}" Value="False" /> </MultiDataTrigger.Conditions> <Setter Property="IsEnabled" Value="False" /> </MultiDataTrigger> </Style.Triggers> </Style> </TextBox.Style> 2) Can I do this outside of the tag? I'm not really sure where Triggers can be applied, most samples do it within Style or DataTemplates, but defining it within a Style is messing up my default look and feel for the TextBox.

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• WPF: Link from grid to form

  - by Ron H

  What I need is a grid with all employees data, and a link to a single employees form. I'm ok with filling the grid with data. my questions are: how to create the link? how to send the parameter (employeeid) to the single-employee page, and make it open with the correct data. Thanks, Ron

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• WPF 4, ListView and ListCollectionView custom sorting

  - by JustABill

  I'm trying to use a custom sort with a ListView, as described in this blog entry. I'm doing ListCollectionView view = (ListCollectionView)CollectionViewSource.GetDefaultView(TheList.ItemsSource); as recommended there and in several other places, but for some reason I'm getting "Unable to cast object of type 'MS.Internal.Data.EnumerableCollectionView' to type 'System.Windows.Data.ListCollectionView'." (TheList is of type ListView). What could be causing this?

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• WPF: ComboBox DisplayMemberPath is suddenly not shown anymore ?

  - by msfanboy

  Hello, in my ComboBox I see 3 times this: MyNameSpace.ViewModel.CustomerViewModel ?? Actually this code worked but now don`t know what I changed: <ComboBox DisplayMemberPath="{Binding Path=CustomerName}" SelectedIndex="0" ItemsSource="{Binding CustomersViewModel}" /> Customers is a ObservableCollection The same code works fine with a ListBox just using DisplayMemberBinding instead of DisplayMemberPath. What is wrong?

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• WPF - How do I get an object that is bound to a ListBoxItem back

  - by JonBlumfeld

  Hi there here is what I would like to do. I get a List of objects from a database and bind this list to a ListBox Control. The ListBoxItems consist of a textbox and a button. Here is what I came up with. Up to this point it works as intended. The object has a number of Properties like ID, Name. If I click on the button in the ListBoxItem the Item should be erased from the ListBox and also from the database... <ListBox x:Name="taglistBox"> <ListBox.ItemContainerStyle> <Style TargetType="{x:Type ListBoxItem}"> <Setter Property="HorizontalAlignment" Value="Stretch"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="ListBoxItem"> <ContentPresenter HorizontalAlignment="Stretch"/> </ControlTemplate> </Setter.Value> </Setter> <Setter Property="Tag" Value="{Binding TagSelf}"></Setter> </Style> </ListBox.ItemContainerStyle> <ListBox.ItemTemplate> <DataTemplate> <Grid HorizontalAlignment="Stretch"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"/> <ColumnDefinition/> </Grid.ColumnDefinitions> <Button Grid.Column="0" Name="btTag" VerticalAlignment="Center" Click="btTag_Click" HorizontalAlignment="Left"> <Image Width="16" Height="16" Source="/WpfApplication1;component/Resources/104.png"/> </Button> <TextBlock Name="tbtagBoxTagItem" Margin="5" Grid.Column="1" Text="{Binding Name}" VerticalAlignment="Center" /> </Grid> </DataTemplate> </ListBox.ItemTemplate> </ListBox> The Textblock.Text is bound to object.Name and the ListBoxItem.Tag to object.TagSelf (which is just a copy of the object itself). Now my questions If I click the button in the listboxItem how do I get the listboxitem and the object bound to it back. In order to delete the object from the database I have to retrieve it somehow. I tried something like ListBoxItem lbi1 = (ListBoxItem)(taglistBox.ItemContainerGenerator.ContainerFromItem(taglistBox.Items.CurrentItem)); ObjectInQuestion t = (ObjectInQuestion) lbi1.Tag; Is there a way to automatically update the contents of the ListBox if the Itemssource changes? Right now I'm achieving that by taglistBox.ItemsSource = null; taglistBox.ItemsSource = ObjectInQuestion; I'd appreciate any help you can give :D Thanks in advance

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• WPF Open Combobox popup on Focus or GotFocus

  - by ashish.magroria

  Hi, I am trying to open the combobox popup when it is focused using Style/Event Trigger I used the following code in my Combobox control Template: <ControlTemplate x:Key="ComboBoxTemplate" TargetType="{x:Type ComboBox}"> <Grid > <ToggleButton Grid.Column="2" Template="{DynamicResource ComboBoxToggleButton}" x:Name="ToggleButton" Focusable="false" IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press"/> <ContentPresenter HorizontalAlignment="Left" Margin="3,3,23,3" x:Name="ContentSite" VerticalAlignment="Center" Content="{TemplateBinding SelectionBoxItem}" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" IsHitTestVisible="False"/> <TextBox Visibility="Hidden" Template="{DynamicResource ComboBoxTextBox}" HorizontalAlignment="Left" Margin="3,3,23,3" x:Name="PART_EditableTextBox" Style="{x:Null}" VerticalAlignment="Center" Focusable="True" Background="Transparent" IsReadOnly="{TemplateBinding IsReadOnly}"/> <Popup IsOpen="{TemplateBinding IsDropDownOpen}" Placement="Bottom" x:Name="Popup" Focusable="False" AllowsTransparency="True" PopupAnimation="Slide"> <Grid MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{TemplateBinding ActualWidth}" x:Name="DropDown" SnapsToDevicePixels="True"> <Border x:Name="DropDownBorder" Background="{DynamicResource ShadeBrush}" BorderBrush="{DynamicResource SolidBorderBrush}" BorderThickness="1"/> <ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" CanContentScroll="True"> <StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained"/> </ScrollViewer> </Grid> </Popup> </Grid> <ControlTemplate.Triggers> **<Trigger Property="IsMouseOver" Value="True"> <Setter Property="IsOpen" Value="True" TargetName="Popup"/> </Trigger>** </ControlTemplate.Triggers> </ControlTemplate> But nothing happens with this code. So I trid the following Event trigger in ControlTemplate.Triggers <EventTrigger RoutedEvent="UIElement.GotFocus"> <BeginStoryboard> <Storyboard > <BooleanAnimationUsingKeyFrames Storyboard.TargetName="Popup" Storyboard.TargetProperty="IsOpen" FillBehavior="HoldEnd"> <DiscreteBooleanKeyFrame KeyTime="00:00:00" Value="True" /> </BooleanAnimationUsingKeyFrames> </Storyboard> </BeginStoryboard> </EventTrigger> <EventTrigger RoutedEvent="UIElement.LostFocus"> <BeginStoryboard> <Storyboard > <BooleanAnimationUsingKeyFrames Storyboard.TargetName="Popup" Storyboard.TargetProperty="IsOpen" FillBehavior="HoldEnd"> <DiscreteBooleanKeyFrame KeyTime="00:00:00" Value="False" /> </BooleanAnimationUsingKeyFrames> </Storyboard> </BeginStoryboard> </EventTrigger> Now this helps open the popup on focus, but when I select any item from dropdown the pop up doesnt disappear as usual; it stays open. it closes only after I click somewhere else in the window. Can someone please suggest the proper way to do this Thanks in advance

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• WPF TabControl Determine header Heigth?

  - by Petoj

  Lets say i have a reference to a TabControl is there any way to get the height of the headers? The reason for this is the following i have one tabcontrol and one image above it and i want the headers to be on the image.. so my idear was to write a value converter that can convert a tabcontrol to a Thickness.. and by using this i would be able to place the headers on top of the image...

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