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• Accessing "current class" from WPF custom MarkupExtension

  - by chaiguy

  I'm attempting to write a custom MarkupExtension to make my life easier by giving me a better way to specify bindings in XAML. However I would like to know if there is any way I can access the object that represents the file the MarkupExtension is used in. In other words, suppose I have a UserControl that defines a particular rendition of a data model of my program. This control has lots of visual stuff like grids, borders and general layout. If I use my MarkupExtension on a particular property of some element in this UserControl, I want to access the instance of the UserControl, without knowing what type it is (I plan on using reflection). Is this at all possible?

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• WPF button click in C# code

  - by KMC

  I have an array of button which is dynamically generated at run time. I have the function for button click in my code, but I can't find a way to set the button's click name in code. So, what is the code equivalent for XAML: <Button x:Name="btn1" Click="btn1_Click"> Or, what should I place for "????" in the following Code: Button btn = new Button()btn.Name = "btn1";btn.???? = "btn1_Click";

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• WPF Listbox with checkboxes appearing blank, added dynamically

  - by wonea

  I'm trying to populate a listbox with a series checkbox entries, however once running the code below the listbox has blank entries in it, which are selectable, i.e. a blue bar appears. However neither the text or checkbox appears. for (int num = 1; num <= 10; num++) { CheckBox checkBox = new CheckBox(); checkBox.Text = "sheet" + num.ToString(); checkBox.Name = "checkbox" + num.ToString(); thelistbox.Items.Add(checkBox); }

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• Is there a 'RowSpan = "All"' in WPF

  - by Chris Spicer

  Take for the following for example: <GridSplitter Grid.Row="0" Grid.Column="1" Background="Yellow" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="Auto" Height="Auto" Grid.RowSpan="3" ResizeDirection="Columns etc etc This will create a GridSplitter across the 3 rows that I have in my grid. However, it's conceivable that I might add another row to my grid at a later stage, and I don't really want to go back and have all of my rowspans. My first guess was Grid.RowSpan="*", but that doesn't compile. Does anyone know the answer to this off hand?

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• Pattern Brushes in WPF

  - by daub815

  I am struggling with creating various brushes to fill in various shapes or as a background. Here are some patterns I am struggling with creating: <<<< <|<|<|<|||| //////// \\\\ |||||||| I've been able to create the \\\, //////, and |||||| with a linear gradient, but the first two are causing me issues. BTW, the second one is a triangle. Any suggestions or help would be greatly appreciated.

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• WPF textblock binding question.

  - by the empirical programmer

  I'm trying to get my head around the whole MVVM thing and binding. I have a ViewModel class which has a property that is another class. I want to bind to a (string) property of that class to the text of a textblock. I set the ViewModel as my data context for my window\page. And then do this: <TextBlock Text="{Binding ElementName=myAddressClass, Path=StreetName}" /> But this does not work. The text is empty. I can expose the StreetName directly as below and this works: <TextBlock Text="{Binding Path=StreetName}" /> So am I doing something wrong in the first example. It seems simple enough ... am I just confuse about what an elementname is or should be set to? thanks

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• Why the databinding fails in ListView (WPF) ?

  - by Ashish Ashu

  I have a ListView of which ItemSource is set to my Custom Collection. I have defined a GridView CellTemplate that contains a combo box as below : <ListView MaxWidth="850" Grid.Row="1" SelectedItem="{Binding Path = SelectedCondition}" ItemsSource="{Binding Path = Conditions}" FontWeight="Normal" FontSize="11" Name="listview"> <ListView.View> <GridView> <GridViewColumn Width="175" Header="Type"> <GridViewColumn.CellTemplate> <DataTemplate> <ComboBox Style="{x:Null}" x:Name="TypeCmbox" Height="Auto" Width="150" SelectedValuePath="Key" DisplayMemberPath="Value" SelectedItem="{Binding Path = MyType}" ItemsSource="{Binding Path = MyTypes}" HorizontalAlignment="Center" /> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> </ListView> My Custom collection is the ObservableCollection. I have a two buttons - Move Up and Move Down on top of the listview control . When user clicks on the Move Up or Move Down button I call MoveUp and MoveDown methods of Observable Collection. But when I Move Up and Move Down the rows then the Selected Index of a combo box is -1. I have ensured that selectedItem is not equal to null when performing Move Up and Move Down commands. Please Help!!

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• WPF DataGridComboBoxColumn`s ComboBox is only visible when DataGrid has IsReadOnly=FALSE

  - by msfanboy

  Hello, Why is the ComboBox in that column only visible via double-click in the empty cell when the DataGrid is set to IsReadOnly = FALSE ??? <DataGridComboBoxColumn Width="*" IsReadOnly="False" Header="test" />

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• WPF How to add and perform events on those controls generated during Runtime

  - by 103318677739703278524

  For example, I have an empty tabControl in my Windows during the compile time, and I have an undetermined amount of images need to be added onto the tabControl, so I used loop + tabControl.Children.Add("image1 to x") to add those images... but after that during runtime, I want to perform events on those image controls, such as dragging the image from the tabControl to another Panel. Is it possible to do so? If it's possible, how?

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• Drag and Drop ListBox for WPF

  - by drasto

  I'm looking for just a simple ListBox with build-in Drag & Drop. I think that Silverlite 4 Toolkit has something like that. The BoxList should be able to: reorder by draging & droping items drag item from one BoxList to another display preview (ghost version) of dragged item show drop location (like a line between items where the dragged will be inserted) I hope there is some solution from microsoft (in toolkit for example), but if not I all be happy with any working solution. For example I wander what control was used in DataGrid column headers reordering (by draging and droping them) implementation. Thank you for any suggestions

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• Problem with align button in treeview in wpf

  - by phenevo

  Hi, I've got something: <HierarchicalDataTemplate DataType="{x:Type MyService:Country}" ItemsSource="{Binding Path=ListOfAreas}"> <StackPanel Orientation="Horizontal"> <TextBlock TextAlignment="Center" Text="{Binding Path=Name}"/> <Button Name="MyButton" Height="20" Content="Add Area"></Button> </StackPanel> </HierarchicalDataTemplate> It works, but not nice way, because I want to have TextBox at middle hight of button. Now it is at top hight of button. for example: NOW: MYTEXTBOX |||||||||||| ||Add Area|| |||||||||||| Expected result |||||||||||| MYTEXTBOX ||Add Area|| ||||||||||||

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• WPF Trigger when property value is greater than a certain amount

  - by Micah

  I want to do something like this: <ControlTemplate.Triggers> <Trigger Property="Width" Value=">25"> <!-- Set values here --> </Trigger> </ControlTemplate.Triggers> Anyway to do something like this?

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• How do I "DoEvents" in WPF?

  - by SLC

  I've read that the C# version is as follows: Application.Current.Dispatcher.Invoke( DispatcherPriority.Background, new Action(delegate { })); However I cannot figure out how to put the empty delegate into VB.NET, as VB.NET does not appear to support anonymous methods. Ideas? Edit: Possibly this? Application.Current.Dispatcher.Invoke( DispatcherPriority.Background, New Action(Sub() End Sub))

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• treeview size in wpf

  - by AComputert

  please let me know how can I re size height of tree view control when screen resolution is changed? please see this code: <TreeView Name="treeView1" Height="150" VerticalAlignment="Top"> <TreeViewItem Header="Root" IsExpanded="True"> <TreeViewItem Header="Item 1"></TreeViewItem> <TreeViewItem Header="Item 2"></TreeViewItem> <TreeViewItem Header="Item 3"></TreeViewItem> <TreeViewItem Header="Item 4"></TreeViewItem> <TreeViewItem Header="Item 5"></TreeViewItem> <TreeViewItem Header="Item 6"></TreeViewItem> <TreeViewItem Header="Item 7"></TreeViewItem> <TreeViewItem Header="Item 8"></TreeViewItem> <TreeViewItem Header="Item 9"></TreeViewItem> <TreeViewItem Header="Item 10"></TreeViewItem> <TreeViewItem Header="Item 11"></TreeViewItem> <TreeViewItem Header="Item 12"></TreeViewItem> <TreeViewItem Header="Item 13"></TreeViewItem> <TreeViewItem Header="Item 14"></TreeViewItem> <TreeViewItem Header="Item 15"></TreeViewItem> <TreeViewItem Header="Item 16"></TreeViewItem> <TreeViewItem Header="Item 17"></TreeViewItem> <TreeViewItem Header="Item 18"></TreeViewItem> <TreeViewItem Header="Item 19"></TreeViewItem> <TreeViewItem Header="Item 20"></TreeViewItem> <TreeViewItem Header="Item 21"></TreeViewItem> <TreeViewItem Header="Item 22"></TreeViewItem> <TreeViewItem Header="Item 23"></TreeViewItem> <TreeViewItem Header="Item 24"></TreeViewItem> <TreeViewItem Header="Item 24"></TreeViewItem> </TreeViewItem> </TreeView> in some screen resolutions i can see all nodse and in some resolutions i see a scroll bar. I want to see all nodes without scroll bar.

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• WPF control not being updated when source is changed

  - by Dave Colwell

  Hi, I have a ListBox which is bound to a list of objects. When the system initializes, the binding is done just fine, When i update the value in one of the fields on the ListBox, the item in the background updates as well, but when i update the value in the background it is not reflected in the ListBox. Does anyone know why this is?

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• WPF Drag-to-scroll doesn't work correctly.

  - by Garegin

  Hi all, I am tying to realize a drag-to-scroll functionality in my application and have problems on my way. Can anybody help me? I have a ScrollViewer and inside it an ItemsControl and within ItemsTemplate I have a UserControl. I want to drag that UserControl within ItemsControl. I want the ScrollViewer to scroll down, when I am dragging to the boundaries of the ItemsControl. protected override void OnPreviewMouseMove(System.Windows.Input.MouseEventArgs e) { if (this.IsMouseCaptured) { // Get the new mouse position. Point mouseDragCurrentPoint = e.GetPosition(this); if (Math.Abs(mouseDragCurrentPoint.Y - this.ActualHeight) <= 50) { this._scrollStartOffset.Y += 5; _containingScrollViewer.ScrollToVerticalOffset(this._scrollStartOffset.Y); } if (mouseDragCurrentPoint.Y <= 50) { this._scrollStartOffset.Y -= 5; _containingScrollViewer.ScrollToVerticalOffset(this._scrollStartOffset.Y); } } base.OnPreviewMouseMove(e); } When i start dragging by calling DragDrop.DoDragDrop() scrolling don't happens. But when i disable dragging, the ScrollViewer scrolls down dependong on mouse position. Maybe there's something that i don't take into accont about dragging and Capturing the mouse? Thanks for attention. Garegin

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• WPF: Custom control that binds its content to a label

  - by nialsh

  I want to write a custom control that's used like this: <HorizontalTick>Some string</HorizontalTick> It should render like this: -- Some string ------------------------------------------- Here's my code: <UserControl x:Class="WeatherDownloadDisplay.View.HorizontalTick" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:Ignorable="d" d:DesignWidth="348" Name="controlRoot"> <DockPanel LastChildFill="True"> <UserControl VerticalAlignment="Center" BorderBrush="Black" BorderThickness="1" Width="10"/> <Label Content="???" /> <UserControl VerticalAlignment="Center" BorderBrush="Black" BorderThickness="1"/> </DockPanel> It works except for the label binding. Can someone help me fill in the question marks? I thought about using a ContentPresenter but it seems like an inline binding would be best. -Neal

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• UserControl that is also a Grid in WPF

  - by drasto

  I would like to create a UserControl that will have some behavior(animated collapsing...) and some Controls in it (Rectangle, Ellipse, mostly for design purposes). However I need it to be a valid Panel like Grid so I can put more controls in it when designing main window. Controls that will be add to the new USerControl in main window design time does not need to interact with components that are added to it when creating a UserControl. How should I do this ? Do I have to extends Control? I'd prefer to extend just UserControl.

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• WPF: how to define collections for use in xaml

  - by Aran Mulholland

  I want to define something like this <myCustomControl> <myCustomControl.Images> <Image Source="{StaticResource LockedIcon16}" /> <Image Source="{StaticResource UnlockedIcon16}"/> <myCustomControl.Images> <myCustomControl/> what property definitions do i need to get that collection (Images) happening?

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• WPF: Notify visualParent when its children changed their size

  - by minaevs

  I have FrameworkElement, for example Grid, that has children(Cells, implemented in another control). When main Window changes size, i handle sizeChanged in Grid at first, and after that in some of its children. How can i get notify that all children sizeChanged events finished processing? Of course, i can raise other event in child sizeChanged and increase some counter, but for some reasons it is not the best decision. Can anyone recommend something? Thanks!

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• WPF UserControl event called only once?

  - by 742

  Hi Everyone, I need to bind two-way a property of a user control to a property of a containing user control. I also need to set a default value to the property from code in the child (cannot be done easily from XAML tags). If I call my code from the child constructor, the value is set in the parent but the change callback routine is not triggered (my understanding is that the parent doesn't yet exist at the time the child is created). My current workaround is to catch the Loaded event of the child and to call the code from the handler. Howver as Loaded is called more than once, I need to set a flag to set the property only the first time. I don't like this way, but I don't know if there is a single shot event that could be used, or if this can be done otherwise. Any feedback based on your experience?

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• WPF binding comboboxes to parent- child model

  - by PaulB

  I've got a model with a few tiers in it - something along the lines of ... Company Employees Phone numbers So I've got a ListBox showing all the companys in the model. Each ListBoxItem then contains two comboboxes ... one for employees, one for phone numbers. I can successfully get the employee combo to bind correctly and show the right people, but I'd like the phone combo to show the numbers for the selected employee. I'm just setting the DataContext of the ListBox to the model above and using the following data template for each item <DataTemplate x:Key="CompanyBody"> <StackPanel Orientation="Horizontal"> <Label Content="{Binding Path=CompanyName}"></Label> <ComboBox Name="EmployeesCombo" ItemsSource="{Binding Path=Company.Employees}"></ComboBox> <!-- What goes here --> <ComboBox DataContext="???" ItemsSource="??" ></ComboBox> </StackPanel> </DataTemplate> I've tried (naively) <ComboBox ItemsSource="{Binding Path=Company.Employees.PhoneNumbers}" ></ComboBox> and <ComboBox DataContext="EmployeesCombo.SelectedValue" ItemsSource="{Binding Path=PhoneNumbers}" ></ComboBox> and all other manner of combinations ...

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• Building IronRuby WPF GUIs

  - by Vlad

  This may be a silly question but I was under the impression that it was possible to use IronRuby and MS Visual Studio 2010 together to sort of build interfaces\edit XAML in one window and code ruby in the other? Is this only possible to do with C#, Basic and C++ ? I've browsed SO and seen some IronRuby snippets like this one: button1.click do |sender, args| MessageBox.show("Hello World!") end So it stands to reason you can create GUIs somehow, but is the visual gui creator not available for ironruby?

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• Anyone doing here WPF with MVC/MVP pattern ?

  - by msfanboy

  Would you mind tell me why? :)

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• WPF: issue updating UI from background thread

  - by Ted Shaffer

  My code launches a background thread. The background thread makes changes and wants the UI in the main thread to update. The code that launches the thread then waits looks something like: Thread fThread = new Thread(new ThreadStart(PerformSync)); fThread.IsBackground = true; fThread.Start(); fThread.Join(); MessageBox.Show("Synchronization complete"); When the background wants to update the UI, it sets a StatusMessage and calls the code below: static StatusMessage _statusMessage; public delegate void AddStatusDelegate(); private void AddStatus() { AddStatusDelegate methodForUIThread = delegate { _statusMessageList.Add(_statusMessage); }; this.Dispatcher.BeginInvoke(methodForUIThread, System.Windows.Threading.DispatcherPriority.Send); } _statusMessageList is an ObservableCollection that is the source for a ListBox. The AddStatus method is called but the code on the main thread never executes - that is, _statusMessage is not added to _statusMessageList while the thread is executing. However, once it is complete (fThread.Join() returns), all the stacked up calls on the main thread are executed. But, if I display a message box between the calls to fThread.Start() and fThread.Join(), then the status messages are updated properly. What do I need to change so that the code in the main thread executes (UI updates) while waiting for the thread to terminate? Thanks.

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