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• WPF Applying a trigger on binding failure

  - by Aran Mulholland

  This question is a follow on from this one... I am binding to a heterogeneous collection of objects, not all objects have the same set of properties. I am doing this in a datagrid. I would like to gray out the cell if the binding fails. Is there a way to apply a trigger if a binding fails?

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• Wpf ListViewItem Background binding to enum

  - by Christian

  Hi Guys I´ve got a ListView which is bound to the ObservableCollection mPersonList. The Class Person got an enum Sex. What i want to do is to set the background of the ListViewItem to green if the person is male and to red if the person is female. Thanks for the answers!

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• Can a custom WPF control implement the IsDefault property

  - by jpierson

  I have a custom button control that does not derive from Button. Is it possible for me to implement the equivalent of IsDefault so that the command associated with my control will be invoked. I was hoping that this was an attached property that I could add to any control but as far as I can tell it doesn't seem to be. Am I out of luck if my control does not derive from Button or is there at least a reasonable workaround?

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• WPF / Silverlight Binding when setting DataTemplate programically

  - by Daniel

  I have my little designer tool (my program). On the left side I have TreeView and on the right site I have Accordion. When I select a node I want to dynamically build Accordion Items based on Properties from DataContext of selected node. Selecting nodes works fine, and when I use this sample code for testing it works also. XAML code: <layoutToolkit:Accordion x:Name="accPanel" SelectionMode="ZeroOrMore" SelectionSequence="Simultaneous"> <layoutToolkit:AccordionItem Header="Controller Info"> <StackPanel Orientation="Horizontal" DataContext="{Binding}"> <TextBlock Text="Content:" /> <TextBlock Text="{Binding Path=Name}" /> </StackPanel> </layoutToolkit:AccordionItem> </layoutToolkit:Accordion> C# code: private void treeSceneNode_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e) { if (e.NewValue != e.OldValue) { if (e.NewValue is SceneNode) { accPanel.DataContext = e.NewValue; //e.NewValue is a class that contains Name property } } } But the problem occurs when I'm trying to achive this using DateTemplate and dynamically build AccordingItem, the Binding is not working: <layoutToolkit:Accordion x:Name="accPanel" SelectionMode="ZeroOrMore" SelectionSequence="Simultaneous" /> and DataTemplate in my ResourceDictionary <DataTemplate x:Key="dtSceneNodeContent"> <StackPanel Orientation="Horizontal" DataContext="{Binding}"> <TextBlock Text="Content:" /> <TextBlock Text="{Binding Path=Name}" /> </StackPanel> </DataTemplate> and C# code: private void treeSceneNode_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e) { if (e.NewValue != e.OldValue) { ResourceDictionary rd = new ResourceDictionary(); rd.Source = new Uri("/SilverGL.GUI;component/SilverGLDesignerResourceDictionary.xaml", UriKind.RelativeOrAbsolute); if (e.NewValue is SceneNode) { accPanel.DataContext = e.NewValue; AccordionItem accController = new AccordionItem(); accController.Header = "Controller Info"; accController.ContentTemplate = rd["dtSceneNodeContent"] as DataTemplate; accPanel.Items.Add(accController); } else { // Other type of node } } } I really need help with this issue. Thanks for any support.

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• WPF TextBlock Binding to DependencyProperty

  - by Bill Campbell

  Hi, I have what I believe to be about one of the most simple cases of attempting to bind a view to a dependencyproperty in the view model. It seems that the initial changes are reflected in the view but other changes to the DP do not update the view's TextBlock. I'm probably just missing something simple but I just can't see what it is. Please take a look... My XAML has a status bar on the bottom of the window. I want to bind to the DP "VRAStatus". <StatusBar x:Name="sbar" Grid.Column="0" Grid.Row="2" Grid.ColumnSpan="2" VerticalAlignment="Bottom" Background="LightBlue" Opacity="0.4" DockPanel.Dock="Bottom" > <StatusBarItem> <TextBlock x:Name="statusBar" Text="{Binding VRAStatus}" /> </StatusBarItem> <StatusBarItem> <Separator Style="{StaticResource StatusBarSeparatorStyle}"/> </StatusBarItem> </StatusBar> My viewmodel has the DP defined: public string VRAStatus { get { return (string)GetValue(VRAStatusProperty); } set { SetValue(VRAStatusProperty, value); } } // Using a DependencyProperty as the backing store for VRAStatus. public static readonly DependencyProperty VRAStatusProperty = DependencyProperty.Register("VRAStatus", typeof(string), typeof(PenskeRouteAssistViewModel),new PropertyMetadata(string.Empty)); Then, in my code I set the DP: VRAStatus = "Test Message..."; Is there something obvious here that I am missing? In my constructor for the viewmodel I set the DP like this: VRAStatus = "Ready"; I never get the Test Message to display. Please Help. thanks in advance! Bill

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• Make a c# / wpf event fire only once?

  - by Donnie

  I have a case where I want a given event to execute once, and only once. I'm trying to do it this way, but I'm having prolems (else I wouldn't be asking). Note that the following code is inside the function that decides that the event needs to be fired. EventHandler h = delegate(Object sender, EventArgs e) { FiringControl.TheEvent -= h; // <-- Error, use of unassigned local variable "h" // Do stuff } FiringControl.TheEvent += h; In general this should work because of the way scope is preserved for delegates until after they're done running, but, since h is in the process of being built when I try to use it it is still considered to be "uninitialized", apparently.

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• How to use two templates for ListViewItem using WPF

  - by Gregor

  Hi, I would like to have a ListView that would have have items similar to Microsoft Outlook inbox with items arranged by Conversations (see the attached photo). An item can either be a simple textblock containing the topic of the conversation (on the photo this are the blue lines) or it can contain email information specified by the ListView's header. It would be best if the items with conversation topics would be push buttons so that emails inside that conversation could be shown or hidden by pressing this button. Any ideas how can I achieve this? Do I specify two ListViewItem templates? If yes, how do I tell in the code which template to use for each item? Any help will be GREATLY appreciated!! Regards, Gregor

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• WPF: Soft deletes and binding?

  - by aks

  I have custom objects which implement INotifyProperyChanged and now I'm wondering if it is possible to implement soft delete which would play nicely with binding? Each object would have a IsDeleted property and if this property would be set to true than it would not be displayed in GUI. I was thinking about making a custom markup extension which would decorate Binding class but it hadn't worked out as expected. Now I'm considering using MultiBinding with IsDeleted as one of bound properties so that converter would be able to figure out which object is deleted. But this solution sounds quite complicated and boring. Does anybody have an idea how to implement soft deletes for binding?

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• WPF DataGrid button style

  - by imekon

  If I have a DataGrid in a XAML form, and add the following style: <Style TargetType="Button"> <Setter Property="Margin" Value="2"/> </Style> The data grid locks up the application. I found if I put the style into a resource block that isn't seen by any data grid, then it seems to be happy. However, if I want to have the style above applied to all buttons on my window, I have to put it in various resource blocks that cannot be seen by the data grid. Is there any way to avoid this?

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• WPF Control Templating: Keeping Windows look and feel

  - by Tyler

  I'm working on a control template for an inherited TextBox class. I'd like to use this template to add additional controls with the ScrollViewer. I can achieve that goal just fine, what I can't do recreate the border in such away that it matches the Windows look and feel. I have Windows Classic as my theme on XP. Textboxes are typically shown with the standard inset border style. With the XP Fischer Price theme, borders of textbox are a flat style and light blue. Is there any way of specifying something like this in the template? Ideally it would use the theme default (grey inset for Classic, flat and light blue for fischer price theme).

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• [WPF] SelectionChanged of a child ListBox

  - by quimbs

  Hi, I have a ListBox bound to an ObservableCollection with an ItemTemplate that contains another ListBox. First of all, I tried to get the last selected item of all the listboxes (either the parent and the inner ones) from my MainWindowViewModel this way: public object SelectedItem { get { return this.selectedItem; } set { this.selectedItem = value; base.NotifyPropertyChanged("SelectedItem"); } } So, for example, in the DataTemplate of the items of the parent ListBox I've got this: <ListBox ItemsSource="{Binding Tails}" SelectedItem="{Binding Path=DataContext.SelectedItem, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}"/> The problem now, is that when I select an item from the parent ListBox and then an item from a child listbox, I get this: http://i40.tinypic.com/j7bvig.jpg As you can see, two items are selected at the same time. How can I solve that? Thanks in advance.

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• WPF: Problem with SelectedItem for ComboBox

  - by Anry

  XAML: <ComboBox Height="27" Margin="124,0,30,116" Name="cbProductDefaultVatRate" VerticalAlignment="Bottom" ItemsSource="{Binding}"> <ComboBox.ItemTemplate> <DataTemplate> <Label Height="26" Content="{Binding Path=Value}"/> </DataTemplate> </ComboBox.ItemTemplate> </ComboBox> Set Data for cbProductDefaultVatRate.Items (Type - VatRate): private void ShowAllVatRates() { cbProductDefaultVatRate.Items.Clear(); cbProductDefaultVatRate.ItemsSource = new VatRateRepository().GetAll(); } Similarly, I defined property: private Product SelectedProduct { get; set; } The Product contains VatRate: SelectedProduct.DefaultVatRate How to set SelectedItem equal SelectedProduct.DefaultVatRate? I tried: cbProductDefaultVatRate.SelectedItem = SelectedProduct.DefaultVatRate; But it does not work. Thank you for answers!

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• Put buttons inside ListBox [WPF]

  - by Andrey

  I want to create list of buttons, and i want buttons to spread across the list item space. Here is what i have: <ListBox Margin="44,54,134,0" Name="listView1" Height="64" > <Button Height="20"></Button> <Button Height="20"></Button> </ListBox> Result is: First pic I want something like second picture, but right side of button to stick to right side of list. I tried to bind in ItemTemplate to ListBox width, but this doesn't work for all cases (if width is Auto) Thanks, Andrey

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• Storing entity in XML, using MVVM to read/write in WPF Application

  - by Christian

  Say I've a class (model) called Instance with Properties DatbaseHostname, AccessManagerHostname, DatabaseUsername and DatabasePassword public class Instance { private string _DatabaseHostname; public string DatabaseHostname { get { return _DatabaseHostname; } set { _DatabaseHostname = value; } } private string _AccessManagerHostname; public string AccessManagerHostname { get { return _AccessManagerHostname; } set { _AccessManagerHostname = value; } } private string _DatabaseUsername; public string DatabaseUsername { get { return _DatabaseUsername; } set { _DatabaseUsername = value; } } private string _DatabasePassword; public string DatabasePassword { get { return _DatabasePassword; } set { _DatabasePassword = value; } } } I'm looking for a sample code to read/write this Model to XML (preferably linq2XML) = storing 1:n instances in XML. i can manage the the view and ViewModel part myself, although it would be nice if someone had a sample of that part too..

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• WPF Visibility of a UI element based on combo selection

  - by tim

  Trying to show a label only when a certain item in a combo is selected. Code should pretty much explain it. <ComboBox Name="comboMyCombo"> <ComboBoxItem>Don't show the label</ComboBoxItem> <ComboBoxItem>Show the label</ComboBoxItem> </ComboBox> <Label Visibility="Collapsed">This is my label <Label.Style> <Style> <Style.Triggers> <DataTrigger Binding="{Binding ElementName=comboMyCombo, Path=SelectedValue}" Value="Show the label"> <Setter Property="Label.Visibility" Value="Visible"></Setter> </DataTrigger> </Style.Triggers> </Style> </Label.Style> </Label>

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• WPF scrollviewer

  - by Bert

  Is there a posibility to scroll to a specific place in a ScrollViewer from your code behind? So something like the Slider element you can change the value property...

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• Binding to TreeView in WPF

  - by KrisTrip

  I am trying to bind some data from a class instance to a TreeView. My code is as follows: public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); Parent myClass = new Parent(); this.DataContext = myClass; } } public class Parent { public String Name; public List<string> Children = new List<string>(); private static int count = 0; public Parent() { this.Name = "Test"; for (int i = 0; i < 10; i++) { Children.Add(i.ToString()); } } } And the XAML: <Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:loc="clr-namespace:WpfApplication1" Title="MainWindow" Height="287" Width="525"> <StackPanel Orientation="Horizontal" VerticalAlignment="Stretch"> <TreeView Name="TreeView" ItemsSource="{Binding}"> <TreeView.ItemTemplate> <HierarchicalDataTemplate ItemsSource="{Binding Children}"> <TextBlock Text="{Binding Name}"/> </HierarchicalDataTemplate> </TreeView.ItemTemplate> </TreeView> </StackPanel> </Window> Nothing shows up in my TreeView. What am I doing wrong?

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• wpf: usercontrol vs. customcontrol performance issue

  - by viky

  Which one is better from performance view user control or custom control? Right now I am using user control and In a specific scenario, I am creating around 200(approx.) different instances of this control but it is bit slow while loading and I need to wait atlest 20-30 second to complete the operation. What should I do to increase the performance?

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• WPF Application Typing in Custom TextBox CPU Jumping from 3 to 80 percent

  - by azamsharp

  I have created a RichTextBox called SharpTextBox which indicates and limits the number of characters that can be typed in it. The implementation is shown in the following link: http://www.highoncoding.com/Articles/673_Creating_SharpRichTextBox_for_Live_Character_Count_in_WPF.aspx Anyway when I start typing in the TextBox it goes from 3% to 78%. The TextBox updates the Label control which shows the number of characters remaining for the count. How can I increase the performance of the textbox? UPDATE: I read there seems to be some problem with the TextRange.Text property which kills performance.

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• I've got a ComboBox that's giving me grief in WPF using the MVVM pattern

  - by Mike

  Here's my code: <ComboBox Grid.Column="1" Grid.Row="9" ItemsSource="{Binding Path=PriorityEntries}" SelectedItem="{Binding Path=Priority,Mode=TwoWay}"/> The comboBox is bound properly with PriorityEntries, and when i change the value of the comboBox the "set" of the bound property(Priority) is called setting it to what it needs to be. However, when i close the UserControl that this combobox resides, it calls the set property again with a value of null and then sets what the selectedItem was to null. Why is the comboBox being bound again when I close the usercontrol. I tried setting the mode to OneTime, but that won't reflect any changes...

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• WPF USer Control viewmodel binding

  - by Senthilkumar

  HI Can any one suggest me how bind viewmodel to a usercontrol.. Also please share different way of doing that.. I have added viewmodel and view into my xaml file in namespace and in the user control resource tag.. i have defined a data template with data type as the viewmodel wh i have wrote.. inside that i have added my view (i mean the same usercontrol ih which im editing now is it possible -- please let me know).. I have used content control with content={Binding}.. and contenttemplate as a datatemplate.. in that i have reffered the property which i want to bind from viewmodel).. but its not binding as such.. My query is different ways of binding viewmodel to view in UserControlLibrary Project ?

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• WPF C# Gridview to datatable

  - by toni

  Hi! I have a gridview into a listview and what I want is to convert gridview to a temporal datatable including column headers. How can I do this? Thanks.

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• wpf DependencyProperty Not accepting default value for short

  - by biju

  Hi, I was trying to use tis depencency property in my code but it gives me error says that Default value type does not match type of property 'MyProperty'.But short should accept 0 as default value.Ans also if i try to give null as default value it works..even if its a non nullabel type.How come this happens.. public short MyProperty { get { return (short)GetValue(MyPropertyProperty); } set { SetValue(MyPropertyProperty, value); } } // Using a DependencyProperty as the backing store for MyProperty. This enables animation, styling, binding, etc... public static readonly DependencyProperty MyPropertyProperty = DependencyProperty.Register("MyProperty", typeof(short), typeof(Window2), new UIPropertyMetadata(0));

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• WPF Animation Duration

  - by Allen Ho

  I have a storyboard like the following Duration="0:0:1" Completed="DeviceExplorer_Completed" The animation for some reason does not appear to be working linearly. If I change the duration to something like Duration="0:0:0.8" and assign the stroyboard to a MouseEnter event of a button, the animation moves but does not complete for some reason, I move my mouse over the button a few times before it enetually completes... Any ideas why?

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• WPF Xaml Custom Styling Selected Item Style in a ListBox

  - by John Batdorf

  I have a list box that scrolls images horizontally. I have the following XAML I used blend to create it. It originally had a x:Key on the Style TaregetType line, MSDN said to remove it, as I was getting errors on that. Now I'm getting this error: Error 3 Operation is not valid while ItemsSource is in use. Access and modify elements with ItemsControl.ItemsSource instead. I don't understand how to apply all of this junk that way, I've tried several thing, nothing is working. My goal is to have the selected item's background be white, not blue. Seems like a lot of work for something so small! Thanks. <ListBox ItemsSource="{Binding Source={StaticResource WPFApparelCollection}}" Grid.Row="1" Margin="2,26,2,104" ScrollViewer.VerticalScrollBarVisibility="Hidden" ScrollViewer.HorizontalScrollBarVisibility="Hidden" SelectionMode="Single" x:Name="list1" MouseLeave="List1_MouseLeave" MouseMove="List1_MouseMove" Style="{DynamicResource ListBoxStyle1}" > <Style TargetType="{x:Type ListBoxItem}"> <Setter Property="Background" Value="Transparent"/> <Setter Property="HorizontalContentAlignment" Value="{Binding Path=HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/> <Setter Property="VerticalContentAlignment" Value="{Binding Path=VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/> <Setter Property="Padding" Value="2,0,0,0"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ListBoxItem}"> <Border x:Name="Bd" SnapsToDevicePixels="true" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}"> <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/> </Border> <ControlTemplate.Triggers> <Trigger Property="IsSelected" Value="true"> <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/> <Setter Property="Background" TargetName="Bd" Value="#FFFFFFFF"/> </Trigger> <MultiTrigger> <MultiTrigger.Conditions> <Condition Property="IsSelected" Value="true"/> <Condition Property="Selector.IsSelectionActive" Value="false"/> </MultiTrigger.Conditions> <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/> <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/> </MultiTrigger> <Trigger Property="IsEnabled" Value="false"> <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> <ListBox.ItemsPanel> <ItemsPanelTemplate> <VirtualizingStackPanel Orientation="Horizontal" IsItemsHost="True" /> </ItemsPanelTemplate> </ListBox.ItemsPanel> <ListBox.ItemTemplate> <DataTemplate> <Image Source="{Binding Image}" /> </DataTemplate> </ListBox.ItemTemplate> </ListBox>

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