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• WPF creating custom control - creating control like SpinBox extending TextBox

  - by veedoo

  Hi, What is the best way to extend a control? Lets choose for example SpinBox - we want to extend TextBox to SpinBox - just to add two buttons on the right side, which each one on click checks if Text property is a valid number and if it is increases or decreases the value by 1. Suposse that we have a lot of code using TextBox (Text, IsReadOnly properties and bindings etc.) so we want to replace TextBox by SpinBox without touching rest of the code. 1) we can inherit TextBox - so we have exactly the same interface, but how to add the buttons ?? 2) we can inherit from some layout control - eg. DockPanel - we can add buttons, but we lose TextBox interface. 3) after quick read about ControlTemplates I'm not sure, but I believe that we can add buttons and their logic using ControlTemplates 4) like about templates I'm not sure, but I hope we can inherit decorator class to create decorator with the buttons - we lose interface, but can add TextBox as a child I think that the best solutions is to combine 3) and 4) - create a decorator class and use it in a control template for TextBox. I would be grateful for your ideas and simple code how to implement 3 and 4, especially with code (c#), not xaml. Regards

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• Get ListView Visible items

  - by Vincent Piel

  I have a ListView which might contains a lot of items, so it is virtualized and recycling items. It does not use sort. I need to refresh some value display, but when there are too many items, it is too slow to update everything, so I would like to refresh only the visible items. How could I get a list of all currently displayed items ? I tried to look into the ListView or in the ScrollViewer, but I still have no idea how to achieve this. The solution must NOT go through all items to test if they can be seen, because this would be too slow. I'm not sure code or xaml would be usefull, it is just a Virtualized/Recycling ListView with its ItemSource bound to an Array. Edit Answer : thanks to akjoshi, i found the way : get the ScrollViewer of the ListView (with a FindDescendant method, that you can do yourself with the VisualTreeHelper ). Then use its ScrollViewer.VerticalOffset : it is the number of the first item shown and ScrollViewer.ViewportHeight : it is the count of items shown. Rq : CanContentScroll must be true.

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• Problem with conversion of existing project to Silverlight 4

  - by derklaus

  We have a working Silverlight 3 project. After changing the target framework to Silverlight 4 the application won't start anymore. It throws an exception in the following line in the generated InitializeComponent() method: System.Windows.Application.LoadComponent(this, new System.Uri("/SLAppMain;component/App.xaml", System.UriKind.Relative)); Here is the exception (note the inner exception): System.Windows.Markup.XamlParseException occurred Message= [Line: 0 Position: 0] LineNumber=0 LinePosition=0 StackTrace: bei System.Windows.Application.LoadComponent(Object component, Uri resourceLocator) InnerException: System.TypeLoadException Message=Der Typ 'System.Security.AllowPartiallyTrustedCallersAttribute' konnte nicht aus der mscorlib, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e -Assembly geladen werden. StackTrace: bei System.ModuleHandle.ResolveType(RuntimeModule module, Int32 typeToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount, ObjectHandleOnStack type) bei System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext) bei System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments) bei System.Reflection.CustomAttribute.FilterCustomAttributeRecord(CustomAttributeRecord caRecord, MetadataImport scope, Assembly& lastAptcaOkAssembly, RuntimeModule decoratedModule, MetadataToken decoratedToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, Object[] attributes, IList derivedAttributes, RuntimeType& attributeType, IRuntimeMethodInfo& ctor, Boolean& ctorHasParameters, Boolean& isVarArg) bei System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes, Boolean isDecoratedTargetSecurityTransparent) bei System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean isDecoratedTargetSecurityTransparent) bei System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeAssembly assembly, RuntimeType caType) bei System.Reflection.RuntimeAssembly.GetCustomAttributes(Type attributeType, Boolean inherit) bei System.Attribute.GetCustomAttributes(Assembly element, Type attributeType, Boolean inherit) bei MS.Internal.XamlSchemaContext.ProcessXmlnsDefinitions(Assembly assembly, String assemblyName) bei MS.Internal.XamlSchemaContext.EnsureManagedAssemblyAttributesLoaded() InnerException: The problem is that the type System.Security.AllowPartiallyTrustedCallersAttribute is not contained in the Silverlight version of mscorlib.dll. I have no idea how to fix this nor where to look for causes. Has anyone encountered this problem? What could possibly cause this error?

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• Silverlight 4, combobox databinding problem

  - by synergetic

  In my Silverlight 4 app, CustomerView (UserControl) shows Customer object as it's DataContext. Customer object has IndustryCode string property. I created combobox called cboIndustryCode and bind it to the IndustryCode property the following way: <ComboBox x:Name="cboIndustryCode" SelectedValue="{Binding IndustryCode, Mode=TwoWay}" ... /> In code-behind I populate cboIndustryCode with List of Industry object, which has Code and Name properties: cboIndustryCode.ItemsSource = industries; //which is of List<Industry> type Now, to show everything properly, in XAML I added the following: <ComboBox x:Name="cboIndustryCode" SelectedValue="{Binding IndustryCode, Mode=TwoWay}" DisplayMemberPath="Name" SelectedValuePath="Code" ... /> So, when I get a customer class from my data layer and set the DataContext to this customer instance, the cboIndustryCode properly displays industry name. But, then I edit customer (not necessarily IndustryCode) and save the object (which resets DataContext = new Customer()) and retrieve the customer again from database, and I see that cboIndustryCode no longer working. It just displays nothing, and if I select new value from the list, it does not update underlying customer object's IndustryCode property. The problem goes away, if I put the following code in the place where I set DataContext to a instance of customer, retrieved from database: Binding binding = new Binding("IndustryCode"); binding.Mode = BindingMode.TwoWay; cboIndustryCode.SetBinding(ComboBox.SelectedValueProperty, binding); So, in short, combobox's binding is reset somehow every time I save my data. Can someone tell me the reason?

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• API Failure Sqlite

  - by Joseph Anderson

  I ran the Windows 8 App Certification Kit on my app and it says it will fail because of Sqllite. Am I referencing code incorrectly or can I ignore this problem? Here is the response: Impact if not fixed: Using an API that is not part of the Windows SDK for Windows Store apps violates the Windows Store certification requirements. API __CppXcptFilter in msvcr110.dll is not supported for this application type. sqlite3.dll calls this API. API __clean_type_info_names_internal in msvcr110.dll is not supported for this application type. sqlite3.dll calls this API. API __crtTerminateProcess in msvcr110.dll is not supported for this application type. sqlite3.dll calls this API. API __crtUnhandledException in msvcr110.dll is not supported for this application type. sqlite3.dll calls this API. I am referencing this file: SQLite for Windows Runtime SQLite.WinRT, Version=3.7.14 C:\Program Files (x86)\Microsoft SDKs\Windows\v8.0\ExtensionSDKs\SQLite.WinRT\3.7.14\ In my Windows 8 Metro app using XAML.

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• WPF: Textbox not firing onTextInput event

  - by Kay Ell

  So basically, I have a bunch of TextBoxes that the user gets to fill out. I've got a button that I want to keep disabled until all the TextBoxes have had text entered in them. Here is a sample XAML TextBox that I'm using: <TextBox Name="DelayedRecallScore" TextInput="CheckTextBoxFilled" Width="24" /> And here is the function that I'm trying to trigger: //Disables the OK button until all score textboxes have content private void CheckTextBoxFilled(object sender, RoutedEventArgs e) { /* foreach (TextBox scorebox in TextBoxList) { if (string.IsNullOrEmpty(scorebox.Text)) { Ok_Button.IsEnabled = false; return; } } Ok_Button.IsEnabled = true; */ MessageBox.Show("THIS MAKES NO SENSE"); } The MessageBox is not showing up when TextInput should be getting triggered. As an experiment I tried triggering CheckTextBoxFilled() on PreviewTextInput, and it worked fine then, meaning that for whatever reason, the function just isn't getting called. I also have a validation function that is triggered by PreviewTextInput, which works as it should. At first I thought PreviewTextInput might somehow be interfering with TextInput, so I took PreviewTextInput off the TextBox, but that hasn't managed to fix anything. I'm completely befuddled by why this might happen, so any help would be appreciated.

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• Wpf Mvvm ComboBox

  - by 2Fast4YouBR

  Hi All, I am new in the Wpf world, so I created a couple of views and all of them have at least one ComboBox, as I am using the MvvM pattern, I get my self re-typing all the time the same line of codes to fill the Combo and to get the SelectedItem (creating properties, privates for fill and other to get). Is there some kind of framework that can improve this part ? or hack/trick ??? as I see too much repetitive code... maybe I am doing something wrong, take a look: XAML: <ComboBox name= "cbDepartments" DisplayMemberPath="DepartmentName" SelectedValuePath ="PrimaryKey" ItemsSource="{Binding Path=Departments}" SelectedItem="{Binding Path=DefaultBranch,Mode=TwoWay}" > ViewModel: private Department defaultBranch; public Department DefaultBranch { get { return this.defaultBranch; } set { if (this.defaultBranch != value) { this.defaultBranch = value; this.OnPropertyChanged("DefaultBranch"); this.saveChangeCommand.RaiseCanExecuteChanged(); this.UserMessage = string.Empty; } } } private ObservableCollection<Department> departments; public ObservableCollection<Department> Departments { get { return this.departments; } set { if (this. departments!= value) { this. departments = value; this.OnPropertyChanged("Departments"); } } }

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• Wpf binding problem

  - by Erez

  I have in my window a rectangle with a tooltip, Clicking the button suppose to change the tooltip text but it doesn't. XAML: <Grid> <Grid.RowDefinitions> <RowDefinition/> <RowDefinition/> <RowDefinition/> </Grid.RowDefinitions> <Grid.Resources> <ToolTip x:Key="@tooltip"> <TextBlock Text="{Binding Name}"/> </ToolTip> </Grid.Resources> <TextBlock Text="{Binding Name}" Background="LightCoral" /> <Rectangle Width="200" Height="200" Fill="LightBlue" VerticalAlignment="Center" HorizontalAlignment="Center" ToolTip="{DynamicResource @tooltip}" Grid.Row="1"/> <Button Click="Button_Click" Grid.Row="2" Margin="20">Click Me</Button> </Grid> code behind: public partial class Window1 : Window { public Window1() { DataContext = new Person { Name = "A" }; InitializeComponent(); } private void Button_Click(object sender, RoutedEventArgs e) { DataContext = new Person { Name = "B" }; } }

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• Need to replace 3rd party WinForm controls, what's the closet WPF equivalent?

  - by Refracted Paladin

  I am tired of Windows Forms...I just am. I am not trying to start a debate on it I am just bored with it. Unfortunately we have become dependent on 4 controls in DevExpress XtraEditors. I have had nothing but difficulties with them and I want to move on. What I need now is what the closet replacement would be for the 4 controls I am using. Here they are: LookUpEdit - this is a dropdown that filters the dropdown list as you type. MemoExEdit - this is a textbox that 'pops up' a bigger area when it has focus CheckedComboBoxEdit - this is a dropdown of checkboxes. CheckedListBoxControl - this is a nicely columned list box of checkboxes This is a LOB app that has tons of data entry. In reality, the first two are nice but not essential. The second two are essential in that I would either need to replicate the functionality or change the way the users are interacting with that particular data. I am looking for help in replicating these in a WPF environment with existing controls(codeplex etc) or in straight XAML. Any code or direction would be greatly appreciated but mostly I am hoping to avoid any commercial 3rd party WPF and would instead like to focus on building them myself(but I need direction) or using Codeplex

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• How to toggle a WPF Grid column visibility

  - by serialhobbyist

  I'm having some trouble getting this to work in a WPF app I'm working on. Basically, what I'm after is something like the Task pane in an MMC: The app has three columns in the main part of the display. I need a column on the right side which is resizable. I presume this means using a Grid with a GridSplitter but anything that works will do. I want to be able to save the width of the right-side column when the app is closed and load it when the app is opened but this should be an initial size: the user should be able to resize it. When I resize the window, I want the left- and right-side columns to stay the same size and the middle column to resize with the window width. The left- and right-side columns need to have a minimum width. When I resize the right-side column I want the centre column to get smaller but not the left-side column. I also want to be able to toggle the visibility of the right-side column with a toggle button which is outside the column and when it returns to visibility I want it to be the same width it was before. I'm trying to do as much as possible in XAML and with binding. And can I have it topped with cream, ice cream and chocolate chips, please? :-)

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• How to set the PlayList Index for Mediaplayer(ExpressionMediaPlayer:Mediaplayer)

  - by Subhen

  Hi, I have a Mediaplayer control on my XAML page like below: <CustomMediaElement:CustomMediaPlayer x:Name="custMediaElement" VerticalAlignment="Center" Width="600" Height="300" Visibility="Collapsed" /> Now I am ble to set the playList by using setPlayList() method like below: private void setPlayList() { IEnumerable eLevelData = null; eLevelData = pMainPage.GetDataFromDictonary(pMainPage.strChildFolderID); foreach (RMSMedia folderItems in eLevelData) { string strmediaURL = folderItems.strMediaFileName; if (hasExtension(strmediaURL) == "wmv" || hasExtension(strmediaURL) == "mp4" || hasExtension(strmediaURL) == "mp3" || hasExtension(strmediaURL) == "mpg") { PlaylistItem playListItem = new PlaylistItem(); string thumbSource = folderItems.strAlbumcoverImage; playListItem.MediaSource = new Uri(strmediaURL, UriKind.RelativeOrAbsolute); playListItem.Title = folderItems.strAlbumName; if (!string.IsNullOrEmpty(thumbSource)) playListItem.ThumbSource = new Uri(thumbSource, UriKind.RelativeOrAbsolute); playList.Items.Add(playListItem); } } custMediaElement.Playlist = playList; } Now , I want to change the PlayListIndex of Mediaplayer, when user clicks on a listBox Item , which contains the title of all the songs. When the user clicks on the third song title from the songs Title List the mediaPlayer should play the third song , or if the user cliks on 7th song title, the mediaPlayer should play the 7th song. My motto is to pick up the Selected index from the listbox and assign it to the PlayList Index of mediaPlayer. While I add a watch to playList I am able to see , playList , Items , [0] PlaylistIndex 1 playList , Items , [1] PlaylistIndex 2 But While I am trying to set it from the code , the same property PlaylistIndex seems unavailable. Please help. Thanks, Subhen

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• Binding WPF menu items to WPF Tab Control Items collection

  - by William

  I have a WPF Menu and a Tab control. I would like the list of menu items to be generated from the collection of TabItems on my tab control. I am binding my tab control to a collection to generate the TabItems. I have a TabItem style that uses a ContentPresenter to display the TabItem text in a TextBlock. When I bind the tab items to my menu the menu items are blank. I assume the menu items are looking for the Header property of the TabItems which I am not using. Is there a workaround for my scenario? Is it possible to bind to the Header property of the tab item, when I do not know the number of tabs in advance? Below is a copy of my xaml declarations. Tab Control and items: <DataTemplate x:Key="ClosableTabItemTemplate"> <DockPanel HorizontalAlignment="Stretch"> <Button Command="{Binding Path=CloseWorkSpaceCommand}" Content="X" Cursor="Hand" DockPanel.Dock="Right" Focusable="False" FontFamily="Courier" FontSize="9" FontWeight="Bold" Margin="10,1,0,0" Padding="0" VerticalContentAlignment="Bottom" Width="16" Height="16" Background="Red" /> <ContentPresenter HorizontalAlignment="Center" Content="{Binding Path=DisplayName}"> <ContentPresenter.Resources> <Style TargetType="{x:Type TextBlock}"/> </ContentPresenter.Resources> </ContentPresenter> </DockPanel> </DataTemplate> <DataTemplate x:Key="WorkspacesTemplate"> <TabControl IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding}" ItemTemplate="{StaticResource ClosableTabItemTemplate}" Margin="10" Background="#4C4C4C"/> </DataTemplate> My Menu <Menu Background="Transparent"> <MenuItem Style="{StaticResource TabMenuButtonStyle}" ItemsSource="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type TabControl}}, Path=Items}" ItemContainerStyle="{StaticResource TabMenuItem}"> </MenuItem> </Menu>

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• Why is Dispatcher.Invoke not triggering UI update?

  - by Brandon

  I am trying to reuse a UserControl and also borrow some logic that keeps track of progress. I'll try and simplify things. MyWindow.xaml includes a MyUserControl. MyUserControl has its own progress indicator (Formatting in progress..., Copying files..., etc.) and I'd like to mirror this progress somewhere in the MyWindow form. But, the user control has some logic I don't quite understand. I've read and read but I still don't understand the Dispatcher. Here's a summary of the logic in the user control that updates the progress. this.Dispatcher.Invoke(DispatcherPriority.Input, (Action)(() => { DAProgressIndicator = InfiniteProgress.AddNewInstanceToControl(StatusGrid, new SolidColorBrush(new Color() { A = 170, R = 128, G = 128, B = 128 }), string.Empty); DAProgressIndicator.Message = MediaCardAdminRes.ActivatingCard; ActivateInProgress = true; })); I thought I'd be smart and add an event to MyUserControl that would be called in the ActivateInProgress property set logic. public bool ActivateInProgress { get { return _activateInProgress; } set { _activateInProgress = value; if (ActivateInProgressHandler != null) { ActivateInProgressHandler(value); } } } I'm setting the ActivateInProgressHandler within the MyWindow constructor to the following method that sets the view model property that is used for the window's own progress indicator. private void SetActivation(bool activateInProgress) { viewModel.ActivationInProgress = activateInProgress; } However, the window's progress indicator never changes. So, I'm convinced that the Dispatcher.Invoke is doing something that I don't understand. If I put a message box inside the SetActivation method, the thread blocks and the window's progress indicator is updated. I understand basic threads but this whole Dispatcher thing is new to me. What am I missing?

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• Silverlight: AutoCompleteBox and TextWrapping

  - by Sven Sönnichsen

  How to enable TextWrapping in the AutoCompleteBox control of the SilverlightToolkit (November 2009)? There is no property to set the wrapping mode. So is there any workaround? Sven Here are more infos about my current problem: To me the AutoCompleteBox consists of a list which displays all possible values and a TextBox where I enter a search string and display a selected value. I want now, that the selected value in the TextBox wraps. So here is my current XAML, which uses the AutoCompleteBox in a DataGrid: <data:DataGrid x:Name="GrdComponents" ItemsSource="{Binding Path=Components}" AutoGenerateColumns="false" Margin="4" VerticalAlignment="Stretch" VerticalContentAlignment="Stretch" HorizontalScrollBarVisibility="Visible"> <data:DataGrid.Columns> <data:DataGridTemplateColumn Header="Component" Width="230"> <data:DataGridTemplateColumn.CellEditingTemplate > <DataTemplate> <input:AutoCompleteBox Text="{Binding Component.DataSource, Mode=TwoWay, ValidatesOnExceptions=True, NotifyOnValidationError=True}" Loaded="AcMaterials_Loaded" x:Name="Component" SelectionChanged="AcMaterial_SelectionChanged" IsEnabled="{Binding Component.IsReadOnly, Mode=OneWay, Converter={StaticResource ReadOnlyConverter}}" BindingValidationError="TextBox_BindingValidationError" ToolTipService.ToolTip="{Binding Component.Description}" IsTextCompletionEnabled="False" FilterMode="Contains" MinimumPopulateDelay="1" MinimumPrefixLength="3" ValueMemberPath="Description"> <input:AutoCompleteBox.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding DescriptionTypeNumber}"/> </DataTemplate> </input:AutoCompleteBox.ItemTemplate> </input:AutoCompleteBox> </DataTemplate> </data:DataGridTemplateColumn.CellEditingTemplate> </data:DataGridTemplateColumn> </data:DataGrid.Columns> </data:DataGrid> The AutoCompleteBox uses different values for the list (DescriptionTypeNumer) and for the selected value (Description).

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• Checking if a RoutedEvent has any handlers

  - by AK

  I've got a custom Button class, that always performs the same action when it gets clicked (opening a specific window). I'm adding a Click event that can be assigned in the button's XAML, like a regular button. When it gets clicked, I want to execute the Click event handler if one has been assigned, otherwise I want to execute the default action. The problem is that there's apparently no way to check if any handlers have been added to an event. I thought a null check on the event would do it: if (Click == null) { DefaultClickAction(); } else { RaiseEvent(new RoutedEventArgs(ClickEvent, this));; } ...but that doesn't compile. The compiler tells me that I can't do anything other than += or -= to an event outside of the defining class, event though I'm trying to do this check INSIDE the defining class. I've implemented the correct behavior myself, but it's ugly and verbose and I can't believe there isn't a built-in way to do this. I must be missing something. Here's the relevant code: public class MyButtonClass : Control { //... public static readonly RoutedEvent ClickEvent = EventManager.RegisterRoutedEvent("Click", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(MyButtonClass)); public event RoutedEventHandler Click { add { ClickHandlerCount++; AddHandler(ClickEvent, value); } remove { ClickHandlerCount--; RemoveHandler(ClickEvent, value); } } private int ClickHandlerCount = 0; private Boolean ClickHandlerExists { get { return ClickHandlerCount > 0; } } //... }

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• How to deploy a WPF 4 Full Trust XBAP an on intranet?

  - by sparks

  I'm having trouble running a full trust WPF 4 XBAP (browser application), created with Visual Studio 2010, from my intranet. I do not get a ClickOnce elevation prompt, as described in ScottGu's post on WPF 4: Full Trust XBAP Deployment Starting in WPF 4, the ClickOnce elevation prompt is also enabled for XAML Browser Applications (XBAPs) in Intranet and Trusted Zones, making it easier to deploy full-trust XBAPs. For XBAPs that require security permissions greater than the minimum code access security (CAS) permission grantset of the Intranet and Trusted Zones, the user will be able to click 'Run' on the ClickOnce elevation prompt when they navigate to the XBAP to allow the XBAP to run with the requested permissions. Instead, I get the "Trust Not Granted" message. I'm running the application in two ways; in both cases, I get the "Trust Not Granted" message. First, I'm launching the application by double-clicking on the xbap file from my NAS on the local network. Secondly, I'm also trying to launch the application when it is hosted on a website via IIS from the same machine. Are both of these scenarios considered to be run from an "intranet?" Or does "intranet" mean some in particular here? Or am I doing something completely wrong? Of note, I am able to launch the application without problem when I simply double-click the xbap from my local computer. The xbap in question was created specifically to test the ClickOnce elevation prompt. It was created with Visual Studio 2010 as a WPF Browser Application. The only change I made was to change this to a full trust application (My Project Security tab This is a full trust application). In the publish wizard, I am choosing the following: Where do you want to publish the application? - I chose to publish to a local directory How will user install the application? - I chose "From a CD-ROM or DVD-ROM" Will the application be available offline - All choices were grayed out

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• Silverlight DataForm Memory Leak

  - by Andrew Garrison

  Some Background I have noticed that setting the EditTemplate of a DataForm (from the Silverlight Toolkit) can cause the DataForm to not be garbage collected. Consequently, the parent control of the DataForm cannot be garbage collected either, causing a very significant memory leak. Here's some XAML which demonstrates the case. <toolkit:DataForm HorizontalAlignment="Stretch" Margin="10" VerticalAlignment="Stretch"> <toolkit:DataForm.EditTemplate> <DataTemplate> <toolkit:DataField Label="Dummy Binding:"> <TextBox Text="{Binding DummyBinding, Mode=TwoWay}" /> </toolkit:DataField> </DataTemplate> </toolkit:DataForm.EditTemplate> </toolkit:DataForm> I have opened an issue on CodePlex. The isssue has an attachment which has a project which desmonstrates the case. So, My Question Is Has anyone else encountered this issue? More importantly, does anyone know of any workarounds? How can I force this DataForm to be garbage collected?

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• WPF ComboBox IsSynchronised Default Value

  - by LnDCobra

  I am trying to display a default value (or even NO value) when selected index is -1, or selecteditem is null. This normally works perfectly fine but when I enable IsSynchronizedWithCurrentItem and set it to True, the first value in my DataTable gets displayed. How can I have both IsSynchronizedWithCurrentItem ="True" and show no/default value when it is loaded. My Combo Box XAML: <GroupBox Name="ClientGroup" Header="Client" Margin="63,182,0,177" FontSize="14" HorizontalAlignment="Left" Width="298"> <ComboBox Name="Supplier" Grid.IsSharedSizeScope="True" ItemsSource="{Binding}" IsEditable="True" Text="Please Choose..." TextSearch.TextPath="CompanyName" IsSynchronizedWithCurrentItem="True" Height="23" VerticalAlignment="Top" Margin="0,6,6,0" FontSize="11" StaysOpenOnEdit="True"> <ComboBox.ItemTemplate> <DataTemplate> <Grid Margin="0,5,0,5"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" SharedSizeGroup="CompanyName" /> <ColumnDefinition Width="Auto" SharedSizeGroup="EIC" /> </Grid.ColumnDefinitions> <TextBlock Text="{Binding CompanyName}" Grid.Column="0" /> <TextBlock Text="{Binding EIC, StringFormat=' ({0})'}" Grid.Column="1" FontFamily="Courier New" FontWeight="Bold" FontSize="12" /> </Grid> </DataTemplate> </ComboBox.ItemTemplate> </ComboBox> </GroupBox> My CS code behind: ClientGroup.DataContext = (new CompanyDealsDataSetTableAdapters.CompanyTableAdapter()).GetData(); When I start my application it automatically selects the first row in my data table. It works as expected when I remove IsSynchronizedWithCurrentItem. Any ideas?

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• Idiomatic default sort using WCF RIA, EF4, Silverlight?

  - by Duncan Bayne

  I've got two Silverlight 4.0 ComboBoxes; the second displays the children of the entity selected in the first: <ComboBox Name="cmbThings" ItemsSource="{Binding Path=Things,Mode=TwoWay}" DisplayMemberPath="Name" SelectionChanged="CmbThingsSelectionChanged" /> <ComboBox Name="cmbChildThings" ItemsSource="{Binding Path=SelectedThing.ChildThings,Mode=TwoWay}" DisplayMemberPath="Name" /> The code behind the view provides a (simple, hacky) way to databind those ComboBoxes, by loading Entity Framework 4.0 entities through a WCF RIA service: public EntitySet<Thing> Things { get; private set; } public Thing SelectedThing { get; private set; } protected override void OnNavigatedTo(NavigationEventArgs e) { var context = new SortingDomainContext(); context.Load(context.GetThingsQuery()); context.Load(context.GetChildThingsQuery()); Things = context.Things; DataContext = this; } private void CmbThingsSelectionChanged(object sender, SelectionChangedEventArgs e) { SelectedThing = (Thing) cmbThings.SelectedItem; if (PropertyChanged != null) { PropertyChanged.Invoke(this, new PropertyChangedEventArgs("SelectedThing")); } } public event PropertyChangedEventHandler PropertyChanged; What I'd like to do is have both combo boxes sort their contents alphabetically, and I'd like to specify that behaviour in the XAML if at all possible. Could someone please tell me what is the idiomatic way of doing this with the SL4 / EF4 / WCF RIA technology stack?

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• Give WPF design mode default objects

  - by Janko R

  In my application I have <Rectangle.Margin> <MultiBinding Converter="{StaticResource XYPosToThicknessConverter}"> <Binding Path="XPos"/> <Binding Path="YPos"/> </MultiBinding> </Rectangle.Margin> The Data Context is set during runtime. The application works, but the design window in VS does not show a preview but System.InvalidCastException. That’s why I added a default object in the XYPosToThicknessConverter which is ugly. class XYPosToThicknessConverter : IMultiValueConverter { public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) { // stupid check to give the design window its default object. if (!(values[0] is IConvertible)) return new System.Windows.Thickness(3, 3, 0, 0); // useful code and exception throwing starts here // ... } } My Questions: What does VS/the process that builds the design window pass to XYPosToThicknessConverter and what is way to find it out by myself. How do I change my XAML code, so that the design window gets its default object and is this the best way to handle this problem? I’m using VS2010RC with Net4.0

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• How can I get a Silverlight application to check for an update without the user clicking a button?

  - by Edward Tanguay

  I have made an out-of-browser silverlight application which I want to automatically update every time there is a new .xap file uploaded to the server. When the user right-clicks the application and clicks on Updates, the default is set to "Check for updates, but let me choose whether to download and install them": This leads me to believe that it is possible to make my Silverlight application automatically detect if there is a new .xap file present on the server, and if there is, the Silverlight client will automatically ask the user if he would like to install it. This however is not the case. I upload a new .xap file and the Silverlight application does nothing. Even if I add this to my App.xaml.cs: -- private void Application_Startup(object sender, StartupEventArgs e) { this.RootVisual = new BaseApp(); if (Application.Current.IsRunningOutOfBrowser) { Application.Current.CheckAndDownloadUpdateAsync(); } } and update the .xap file, the Silverlight application does nothing. This information leads me to believe that I have to make a button which the user clicks to see if there is an update. But I don't want the user to have to click a button every day to see if there is an update. I want the application to check by itself if there is a new .xap file and if there is, let the client ask the user if he wants the update. How do I make my Silverlight application check, each time it starts, if there is a new .xap file, and if there is, pass control to the Silverlight client to ask the user if he wants to download it, as the above dialogue implies is possible?

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• WPF Control Background under GridViewColumn

  - by sergo_lsn

  Hi, I'd like make background for colums like in this image http://www.freeimagehosting.net/image.php?e2435df982.png I have CheckBoxes on the left and TreeView on the right. In one column I have checkboxes in other I have treeview. In column with checkboxes I need set background. Background has to be permanent. .... </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> <GridViewColumn Width="25"> All column has to have background not only cell <GridViewColumn.CellTemplate> <DataTemplate> <CheckBox> <CheckBox.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> .... </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </CheckBox.Resources> </CheckBox> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> </GridViewColumn> <GridViewColumn Width="300"/> </TreeListView.Columns> <TreeListView.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> ... TreeView.xaml </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </TreeListView.Resources> <TreeListView.ItemTemplate> <HierarchicalDataTemplate> <HierarchicalDataTemplate.ItemsSource> .... </HierarchicalDataTemplate.ItemsSource> </HierarchicalDataTemplate> </TreeListView.ItemTemplate> </TreeListView>

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• WCF RIA Silverlight deployment issues

  - by Handleman

  It seems the world is awash with people having problems deploying RIA WCF services, and now I'm one too. I've already tried a bunch of things, but to no avail. I need WCF RIA to support a Silverlight 3 application I've built. The short story is, using the new WCF RIA services (Nov 09?) I open VS 2008, create new project (silverlight application), enabling ".NET RIA services". Add new item to web project - Linq2SQL dbml file (from SQL 2005 DB prepared earlier) and compile. I add a new item to the web project - domain service (link the tables I need) and compiled. Using the domain context I "Load" data with a standard RIA get query in the MainPage and add a TextBlock to display returned data. Build & run (cassini) - success. Using VS to publish to IIS on local PC - success. Using VS to publish to test server (IIS6) - browse to location and the Silverlight app loads but Fiddler tells me I've got a 404 on all the the WCF .svc requests. Use Fiddler to "launch IE" on the service request and it's true - 404. I have already run aspnet_regiis, ServiceModelReg and added mime types for .xap, .xaml, .xbap and .svc. I have included the System.Web.Ria and System.Web.DomainServices DLL with copy local true. I need help with either a) a solution b) an approach to find a solution

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• Workflow Service host not publishing Metadata.

  - by jlafay

  Still hacking away with extreme persistence at WF services hosted outside of IIS. I'm now having issues with my WF service publishing metadata. Can someone take a look at my code and see what step I'm missing? The few tutorials that I've stumbled across for my scenario make it look so easy, and I know it is. I'm just missing something ridiculously simple. Here's my current trial code: const string serviceUri = "http://localhost:9009/Subscribe"; WorkflowServiceHost host = new WorkflowServiceHost( new Subscribe(), new Uri(serviceUri) ); SubscriberSvcHost.AddDefaultEndpoints( ); SubscriberSvcHost.Open(); Subscribe() is an activity that is coded in an xaml file and contains simple receive and sendreply activities to test out my hosted workflow service. It is NOT a xamlx (WF service) file. Seems like this should be simple enough to work but when I start the application and the service fires I get this message in my browser when navigating to the URI: "Metadata publishing for this service is currently disabled." Shouldn't adding the default endpoints provide enough metadata and description to satisfy the service init and then go into its wait for message state?

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• How i can add border to ListViewItem, ListView in GridView mode.

  - by Andrew

  Hello! I want to have a border around ListViewItem (row in my case). ListView source and columns generated during Runtime. In XAML i have this structure: <ListView Name="listViewRaw"> <ListView.View> <GridView> </GridView> </ListView.View> </ListView> During Runtime i bind listview to DataTable, adding necessary columns and bindings: var view = (listView.View as GridView); view.Columns.Clear(); for (int i = 0; i < table.Columns.Count; i++) { GridViewColumn col = new GridViewColumn(); col.Header = table.Columns[i].ColumnName; col.DisplayMemberBinding = new Binding(string.Format("[{0}]", i.ToString())); view.Columns.Add(col); } listView.CoerceValue(ListView.ItemsSourceProperty); listView.DataContext = table; listView.SetBinding(ListView.ItemsSourceProperty, new Binding()); So i want to add border around each row, and set border behavior (color etc) with DataTriggers (for example if value in 1st column = "Visible", set border color to black). Can i put border through DataTemplate in ItemTemplate? I know solution, where you manipulate with CellTemplates, but i don't really like it. I want something like this if this even possible. <DataTemplate> <Border Name="Border" BorderBrush="Transparent" BorderThickness="2"> <ListViewItemRow><!-- Put my row here, but i ll know about table structure only during runtime --></ListViewItemRow> </Border> </DataTemplate>

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