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• Silverlight RichTextBox Disable Mouse Selection

  - by Fastidious

  I am writing a custom control based on RichTextBox that needs the ability to process MouseLeftButtonDown events but must not allow user-initiated selection (I'm doing everything programmatically). I tried setting a flag in MouseLeftButtonDown to track dragging and then continuously setting the RichTextBox.Selection to nothing in the MouseMove event but the move event isn't fired until after I release the mouse button. Any ideas on how to solve this? Thanks.

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• Select the Initial Text in a Silverlight TextBox

  - by Dan Auclair

  I am trying to figure out the best way to select all the text in a TextBox the first time the control is loaded. I am using the MVVM pattern, so I am using two-way binding for the Text property of the TextBox to a string on my ViewModel. I am using this TextBox to "rename" something that already has a name, so I would like to select the old name when the control loads so it can easily be deleted and renamed. The initial text (old name) is populated by setting it in my ViewModel, and it is then reflected in the TextBox after the data binding completes. What I would really like to do is something like this: <TextBox x:Name="NameTextBox" Text="{Binding NameViewModelProperty, Mode=TwoWay}" SelectedText="{Binding NameViewModelProperty, Mode=OneTime}" /> Basically just use the entire text as the SelectedText with OneTime binding. However, that does not work since the SelectedText is not a DependencyProperty. I am not completely against adding the selection code in the code-behind of my view, but my problem in that case is determining when the initial text binding has completed. The TextBox always starts empty, so it can not be done in the constructor. The TextChanged event only seems to fire when a user enters new text, not when the text is changed from the initial binding of the ViewModel. Any ideas are greatly appreciated!

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• Is it possible to seletively color a label in Silverlight

  - by joemoe

  For instance, if I have a label: Blah blah bladity blah I want the first 10% of this label, such that the font color should be red, and the rest should be green. This perhaps means it would color the Bl and PART of the a. Basically pixel-wise font coloring instead of character-wise. Is this possible and how would is be accomplished?

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• How to close popup in silverlight?

  - by jolly

  I have ListBox. when i click on ListBox item I have to show item information in popup But it does not close after clicking out side. I am creating popup in itemsselected event. how to handle popup close?

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• Silverlight: stretching to remaining space in StackPanel

  - by crimson13

  I have a vertical StackPanel with two elements: a Button and a ListBox. How can I have the ListBox stretch to the remaining page height? <StackPanel Height="Auto" Width="Auto"> <Button Height="30" Width="100" Content="Get Content" x:Name="GetContent"/> <ListBox Height="Auto" Width="Auto" VerticalAlignment="Stretch" HorizontalAlignment="Stretch"/> </StackPanel> Note that I got this to work using a Grid: <Grid> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="*"/> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="*"/> </Grid.ColumnDefinitions> <Button Width="100" Height="30" Content="Get Content" Click="OnGetContent" Grid.Row="0" Grid.Column="0"/> <data:DataGrid x:Name="MyContent" Margin="0,5" Grid.Row="1" Grid.Column="0"/> </Grid>

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• Multiple client projects to one server project w/ Silverlight & RIA Services Beta

  - by Dale Halliwell

  The type or namespace name 'Resources' does not exist in the namespace 'MyWebProject.Web' (are you missing an assembly reference?) C:\Users\...\MySecondProject\Generated_Code\MyWebProject.Web.g.cs I am having some problems trying to add a second SL client project to my (Ria services) SL Business Application. It has to do with the way the shared Resources files on the Web project are linked to from my new SL client project (the SL client project that was generated by the Business App template works fine). The same problem was brought up in the SL forums but copying the Web folder from my existing SL client doesn't seem to work. How can I add a second SL client project using RIA services to the solution of an existing SL Business Application without these problems over shared resources? Should I avoid the Business Application solution template for solutions with multiple SL clients since it seems to presume only a single client app will be sharing the resource files?

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• Silverlight 4.0 - HttpWebRequest throwing ProtocolViolationException.

  - by cmaduro

  I am getting a "System.Net.ProtocolViolationException: Operation is not valid due to the current state of the object." error when trying to call var request = (HttpWebRequest)WebRequest.Create(uri); request.Method = "GET"; request.ContentType = "text/xml"; request.BeginGetRequestStream(RequestCompleted, request);

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• Silverlight combobox performance issue

  - by Vinzz

  Hi, I'm facing a performance issue with a crowded combobox (5000 items). Rendering of the drop down list is really slow (as if it was computing all items before showing any). Do you have any trick to make this dropdown display lazy? Xaml code: <Grid x:Name="LayoutRoot"> <StackPanel Orientation="Horizontal" Width="200" Height="20"> <TextBlock>Test Combo </TextBlock> <ComboBox x:Name="fooCombo" Margin="5,0,0,0"></ComboBox> </StackPanel> </Grid> code behind: public MainPage() { InitializeComponent(); List<string> li = new List<string>(); int Max = 5000; for (int i = 0; i < Max; ++i) li.Add("Item - " + i); fooCombo.ItemsSource = li; }

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• e.DetailsElement in silverlight

  - by prince23

  hi, is there any way i can write this code in a function() right now what is happening in function is it tells e.Row.DetailsVisibility e.DetailsElement.ActualHeight it is not able to find this it is telling is there any way i can get this e.DetailsElement.ActualHeight if (e.Row.DetailsVisibility == Visibility.Visible) { Dispatcher.BeginInvoke(() => { DataGrid datagrid = sender as DataGrid; if (datagrid != null) { datagrid.Tag = e.DetailsElement.ActualHeight; datagrid.Height = datagrid.ActualHeight + e.DetailsElement.ActualHeight; } } ); } else { DataGrid datagrid = sender as DataGrid; if(datagrid.Tag!=null) datagrid.Height = datagrid.ActualHeight - System.Convert.ToDouble(datagrid.Tag); } }

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• Silverlight 4.0: How to increase quota in Isolated File Storage

  - by xscape

  Got this line of code here but its not working. using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication()) { long newSpace = isf.Quota + spaceRequest; try { if(true == isf.IncreaseQuotaTo(newSpace)) { Debug.WriteLine("success"); } else { Debug.WriteLine("unsuccessful"); } } catch (Exception e) { throw; } }

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• Silverlight 4 Drag and Drop Treeview

  - by Rich

  Does anyone have an example for any of the following scenarios. Given, these are all dynamically populated trees. Not using a Heirarchal data template, but by iterating through object collections manually and appending children at the appropriate level. Treeview1 has 3 levels, but items can only be reordered within their level. So, lets say we have Drives, Folders and Files. Drives can be rearranged in an order, but not put into a Folder. When navigated down one level in a drive, the individual folders can be reordered, but not dragged between drives.. and same with files, only can be reordered, but not moved to a different folder or drive I have 2 treeviews, Treeview1 is the same as #1 above and Treeview2 is like a picklist of available items. A user can drag an item from Treeview2 to Treeview1, but it can only be placed at Treeview1's File Level. The dragged item cannot be a child of a file, or placed at the folder level, nor placed at the drive level. Also, how to handle the Above, On Top, or Below an item. I have yet to come across these examples.

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• Silverlight 4 MediaElement AG_E_NETWORK_ERROR

  - by rotary_engine

  Trying to play a video in SL and getting a AG_E_NETWORK_ERROR error. <MediaElement Source="http://www.archive.org/download/MIT18.02F07/ocw-18_02-f07-lec25_300k.mp4" How can I play this video in SL ?

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• Silverlight chart with behavior/bitmap image tooltip passthrough

  - by isitdanny

  I have a chart showing bound data as tooltips and it works well. I have added a magnifier(set of behaviors class) that captures a bitmap image at two times scale that shows in a circular area over the hover spot. The tooltip does not display. I have tried a custom tooltip service but cannot bind it to the behaviors. I added the tooltip to the behavior class and got a tooltip and data but could not move it with the magnifier. It just sits in the middle and laughs. I added a usercontrol "tooltip"-same issues, could not hook it to the magnifier behavior. I know I can probably build a popup, but really wanted to just pass through the bitmap layer with the tootip. Any ideas would be greatly appreciated. Danny

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• Silverlight Dataform validation doesn't work

  - by VexXtreme

  Hi I can't get dataform and it's controls to catch exceptions when validating. Fir instance, I have: <PasswordBox Password="{Binding Password,Mode=TwoWay,NotifyOnValidationError=true,ValidatesOnExceptions=true}" /> All required properties are set to true. In the setter of my Password property I throw a ValidationException upon failed validation, but the data form doesn't catch it, it just causes the application to crash as if it were a normal exception. Am I doing something wrong? Thanks

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• Synchronize DataGrid and DataForm in Silverlight 3

  - by SpiralGray

  I've been banging my head against the wall for a couple of days on this and it's time to ask for help. I've got a DataGrid and DataForm on the same UserControl. I'm using an MVVM approach so there is a single ViewModel for the UserControl. That ViewModel has a couple of properties that are relevant to this discussion: public ObservableCollection<VehicleViewModel> Vehicles { get; private set; } public VehicleViewModel SelectedVehicle { get { return selectedVehicle; } private set { selectedVehicle = value; OnPropertyChanged( "SelectedVehicle" ); } } In the XAML I've got the DataGrid and DataForm defined as follows: <data:DataGrid SelectionMode="Single" ItemsSource="{Binding Vehicles}" SelectedItem="{Binding SelectedVehicle, Mode=TwoWay}" AutoGenerateColumns="False" IsReadOnly="True"> <dataFormToolkit:DataForm CurrentItem="{Binding SelectedVehicle}" /> So as the SelectedItem changes on the DataGrid it should push that change back to the ViewModel and when the ViewModel raises the OnPropertyChanged the DataForm should refresh itself with the information for the newly-selected VehicleViewModel. However, the setter for SelectedVehicle is never being called and in the Output window of VS I'm seeing the following error: System.Windows.Data Error: ConvertBack cannot convert value 'xxxx.ViewModel.VehicleViewModel' (type 'xxxx.ViewModel.VehicleViewModel'). BindingExpression: Path='SelectedVehicle' DataItem='xxxx.ViewModel.MainViewModel' (HashCode=31664161); target element is 'System.Windows.Controls.DataGrid' (Name=''); target property is 'SelectedItem' (type 'System.Object').. System.MethodAccessException: xxxx.ViewModel.MainViewModel.set_SelectedVehicle(xxxx.ViewModel.VehicleViewModel) It sounds like it's having a problem converting from a VehicleViewModel to an object (or back again), but I'm confused as to why that would be (or even if I'm on the right track with that assumption). Each row/item in the DataGrid should be a VehicleViewModel (because the ItemsSource is bound to an ObservableCollection of that type), so when the SelectedItem changes it should be dealing with an instance of VehicleViewModel. Any insight would be appreciated.

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• Intersection point in silverlight/wpf

  - by Andrei Neagu

  Hello, Given a path like this one : <Path Stretch="Fill" Stroke="#FFD69436" Data="M 0,20 L 22.3,20 L 34,0 L 44.7,20 L 68,20 L 55.8,40 L 68,60 L 44.7,60 L 34,80 L 22.3,60 L 0,60 L 11.16,40 L 0,20 Z"> <Path.Fill> <LinearGradientBrush StartPoint="0,0" EndPoint="0,1"> <LinearGradientBrush.GradientStops> <GradientStop Color="#FFFFFF" Offset="0" /> <GradientStop Color="Orange" Offset="1" /> </LinearGradientBrush.GradientStops> </LinearGradientBrush> </Path.Fill> </Path> How can I get the point that is at the edge of this figure at any angle? Lets say that I want the intersection point between the edge of this figure and a line passing through the center of this figure, at the 30 degrees angle with the OX axe? thanks.

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• Adding a Combobox to a DataGrid in Silverlight

  - by bplus

  I can add a Combobox to a DataGrid using following xmal: <local:DataGridTemplateColumn Header="SomeHeader" Width="106" HeaderStyle="{StaticResource headerAlignRightStyle}" CellStyle="{StaticResource cellAlignRightStyle}"> <local:DataGridTemplateColumn.CellTemplate> <DataTemplate> <TextBlock Text="{Binding SomeProp}" Margin="4"/> </DataTemplate> </local:DataGridTemplateColumn.CellTemplate> <local:DataGridTemplateColumn.CellEditingTemplate> <DataTemplate> <ComboBox x:Name="SomeCombo" SelectionChanged="SomeCombo_SelectionChanged" ItemsSource="{Binding SomeList}" DisplayMemberPath="Name" /> </DataTemplate> </local:DataGridTemplateColumn.CellEditingTemplate> </local:DataGridTemplateColumn> However what I can't figure out is a sensible way to get the row that was combox is bound to. i.e. when handling the combobox SelectionChanged event I have no way of knowing what what row the combobox belongs to. Particularly I don't know what object in the DataGrid datasource that the combobox is refering to. Any help would be much appreciated.

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• Silverlight 4 - encoding PCM data from the microphone

  - by Richard

  Hi I've written a basic SL4 application to capture audio data from the microphone using CaptureSource. The trouble is, it's raw PCM output - which means huge and uncompressed. Given that I need this application to run purely within a SL4 environment, how can I compress the PCM audio data into something that can be delivered to a remote server more easily? In conversation, people have suggested Speex and WMA for instance, but I haven't found any libraries or examples that work without requiring reference to DLL's that won't work in a SL4 project. Thanks, Richard.

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• Silverlight Control Disable/Remove Events

  - by Dave

  I have a scenario where a control has an event wired up in XAML, say a Button.Click. Somewhere else in my code, a security check is applied which mean I need to disable said event, but I do not have access to the normal -= syntax to remove it. How else can I remove or disable this event? Thanks, Dave

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• MouseLeave event in Silverlight 3 PopUp control

  - by AKa

  I want use PopUp (System.Windows.Controls.Primitives.PopUp) control to show some context menu. After mouse leaves, should automatically close. But eventhandler for MouseLeave is never executed. Why? SAMPLE: void DocumentLibrary_Loaded(object sender, RoutedEventArgs e) { DocumentLibraryDialog documentLibraryDialog = new DocumentLibraryDialog(); _popUpDocumentLibraryDialog = new Popup(); _popUpDocumentLibraryDialog.Width = 70; _popUpDocumentLibraryDialog.Height = 20; _popUpDocumentLibraryDialog.MouseLeave += new MouseEventHandler(_popUpDocumentLibraryDialog_MouseLeave); _popUpDocumentLibraryDialog.Child = documentLibraryDialog; } void _popUpDocumentLibraryDialog_MouseLeave(object sender, MouseEventArgs e) { Popup currentPopUp = (Popup)sender; if (currentPopUp.IsOpen) (currentPopUp.IsOpen) = false; } Regards Anton Kalcik

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• What is the Silverlight keycode for a dash "-"

  - by user169867

  I've tried Key.Subtract but I think that is the numpad version. I'm looking for the one after the zero key. I wish to handle it in a KeyDown event. Thanks

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• Making a "Fuzzy border" in Silverlight 3.0

  - by skb

  I would like to have fuzzy looking border around my Canvas control. Basically, I am creating a Print Preview screen, and I want it to look almost exactly like the one in Word 2010. In this, there is a thin gray line, a thin orange line and then a fuzzy gradient around the outside of the page. Check it out and you will see what I mean. Can anyone tell me how I can do this with my Canvas control?

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• Error with using "dynamic" keyword in Silverlight app

  - by joemoe

  I get the following error: "One or more types required to compile a dynamic expression cannot be found. Are you missing references to Microsoft.CSharp.dll and System.Core.dll" I do have System.Core.dll, do have I to find Microsoft.CSharp somewhere? It wasn't part of the project and it isn't in the references list.

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• Silverlight 4 Default Button Service

  - by Mark Cooper

  For a few months I have been successfully using David Justices Default Button example in my SL 3 app. This approach is based on an attached property. After upgrading to SL4, the approach no longer works, and I get a XAML exception: "Unknown parser error: Scanner 2148474880" Has anyone succesfully used this (or any other) default button attached behaviours in SL4? Is there any other way to achieve default button behaviour in SL4 with the new classes that are available? Thanks, Mark

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• WCF RIA Services Silverlight 3.0

  - by John

  Hi, I have downloaded WCF RIA Services Beta from the following website: WCF RIA Services Beta for Visual Studio 2008 SP1 http://www.microsoft.com/downloads/details.aspx?FamilyID=76bb3a07-3846-4564-b0c3-27972bcaabce&displaylang=en#filelist But I am unable to add a reference to the following assembly : system.Windows.Ria.Data I searched at the downloaded location c:\Program files\Microsoft SDK's\RIA Services but i am unable to find this dll. Would appreciate if you could point me what I am missing here.

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