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• How to Prevent SelectionChange a Silverlight DataGrid

  - by Matt Eland

  I'm using a Silverlight 3 DataGrid control and have set the SelectionMode to Extended. The DataGrid takes care of managing the extended selection for me in an almost perfect manner out of the box, but a key piece of the logic is interfering with me. I have a cell that can function as a drag and drop thumb and initiate a drag operation but users want to do a series of shift or control clicks to set a selection followed by a click and drag on one of the selected rows to initiate the drag. The problem is that the click and drag at the end of this series causes the selection to be set to only the row that was clicked. I've poked around for ways of conditionally preventing the DataGrid from changing selection, but can't seem to find anything that works. Does anyone have any ideas for preventing selection from changing?

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• Disable cache in Silverlight HttpWebRequest

  - by synergetic

  My Silverlight4 app is hosted in ASP.NET MVC 2 web application. I do web request through HttpWebRequest class but it gives back a result previously cached. How to disable this caching behavior? There are some links which talks about HttpWebRequest in .NET but Silverlight HttpWebrequest is different. Someone suggested to add unique dummy query string on every web request, but I'd prefer more elegant solution. I also tried the following, but it didn't work: _myHttpWebRequest.BeginGetRequestStream(new AsyncCallback(BeginRequest), new Guid()); In fact, by setting browser history settings it is possible to disable caching. See the following link: http://stackoverflow.com/questions/3027145/asp-net-mvc-with-sql-server-backend-returns-old-data-when-query-is-executed But asking a user to change browser settings is not an option for me.

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• How can I center a Silverlight DataGridTemplateColumn header?

  - by Mike Pateras

  I want to center the header on a Silverlight DataGridTemplateColumn. The following code gets me most of the way there: DataGridTemplateColumn column = new DataGridTemplateColumn(); column.CellTemplate = Resources[templateName] as DataTemplate; column.Header = headerName; column.HeaderStyle = new Style { TargetType = typeof(DataGridColumnHeader) }; column.HeaderStyle.Setters.Add(new Setter(DataGridColumnHeader.HorizontalAlignmentProperty, HorizontalAlignment.Center)); The header is, indeed, centered, but if the column is expanded, the header doesn't stretch. It just remains it's original width, leaving white gaps on either side of it, which looks terrible. What is the proper way to center the column header, such that it still occupies the full width?

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• How to run batched WCF service calls in Silverlight BackgroundWorker

  - by Simon

  Is there any existing plumbing to run WCF calls in batches in a BackgroundWorker? Obviously since all Silverlight WCF calls are async - if I run them all in a backgroundworker they will all return instantly. I just don't want to implement a nasty hack if theres a nice way to run service calls and collect the results. Doesnt matter what order they are done in All operations are independent I'd like to have no more than 5 items running at once Edit: i've also noticed (when using Fiddler) that no more than about 7 calls are able to be sent at any one time. Even when running out-of-browser this limit applies. Is this due to my default browser settings - or configurable also. obviously its a poor man's solution (and not suitable for what i want) but something I'll probably need to take account of to make sure the rest of my app remains responsive if i'm running this as a background task and don't want it using up all my connections.

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• Silverlight DataGrid refresh problem

  - by Krimson

  Hi, I have encountered a problem when I refresh the observable collection behind my Silverlight DataGrid (the DataGrid binds to a PagedCollectionView with an ObservableCollection as source). When I clear the observable collection and add the new items to the collection the DataGrid repositions to the top. I want the DataGrid to keep the scroll position. This seems to somewhat happen if I remove the items in the collection one-by-one with the RemoveAt mehtod and the add the new items one-by-one. But why is there this difference between removing all the items at once with the Clear method and removing the items one-by-one with the RemoveAt method? Best Regards, Jesper

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• Silverlight Textbox scrollviewer problem

  - by user328902

  In silverlight, I got a textbox which I want to be multiline and have mousescrolling available. If I only use textbox then I dont have mousescrolling. If I use a scrollviewer I will have mousescrolling. BUT everytime my writing exceeds the rows that are shown from start the text and caret just dissapears without the scrollviewer doing anything. How do I solve the problem so I get the caretposition effects the scrollviewer? I sofar not managed to find someone with the exact same problem as me.

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• Silverlight 4 - authentiation / authorization against custom wcf service

  - by Calanus

  I have a wcf service in front of an AzMan store that passes roles and operations to clients using the following interface: [OperationContract] bool AuthenticateUser(string password, string appName); [OperationContract] string[] GetRoles(string storelocation, string appName); [OperationContract] string[] GetOperations(string storeLocation, string appName, string selectedRole); Clients connect to this service using windows authentication (but users must send their password through to reaffirm their identity). Ultimately the service delivers an array of operations that each client can perform based on their selected role. I've opened a new Silverlight Business Application and tried to understand how authentication/authorization works in this template, as well as scoured the web to find examples to how to hook my webservice to the login box already created in the template, but I am completely at a loss as how to do this! Can anyone offer any advice?

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• Increase columns width in Silverlight DataGrid to fill whole DG width

  - by Henrik P. Hessel

  Hello, I have a DataGrid Control which is bound to a SQL Table. The XAML Code is: <data:DataGrid x:Name="dg_sql_data" Grid.Row="1" Visibility="Collapsed" Height="auto" Margin="0,5,5,5" AutoGenerateColumns="false" AlternatingRowBackground="Aqua" Opacity="80" > <data:DataGrid.Columns> <data:DataGridTextColumn Header="Latitude" Binding="{Binding lat}" /> <data:DataGridTextColumn Header="Longitude" Binding="{Binding long}" /> <data:DataGridTextColumn Header="Time" Binding="{Binding time}" /> </data:DataGrid.Columns> </data:DataGrid> Is it possible increase the single columns sizes to fill out the complete width of the datagrid? thx!, rAyt Edit: Columns with "*" as width are coming with the Silverlight SDK 4.

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• Silverlight: Why can't silverlight see my xaml file referenced in MergedDictionary?

  - by Sergio

  Hi there, I have a silverlight application with a number of styles defined in a seperate xaml file under the directory /Styles. My App.xaml looks like this: <Application.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="/Styles/Legend.xaml"/> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Application.Resources> Legend.xaml has its build action set to Content and 'Do Not Copy' as the copy to output directory setting. The message I'm getting in blend is: An error occurred while finding the resource dictionary "/Styles/Legend.xaml" Thanks in advance!

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• Silverlight MVVM conversion from WPF

  - by IrishJoker

  I was reading this article - http://msdn.microsoft.com/en-us/magazine/dd419663.aspx And I came across this piece of code in the WPF Demo application that came with the article. This template applies a CustomerView to an instance of the CustomerViewModel class shown in the main window. <DataTemplate DataType="{x:Type vm:CustomerViewModel}"> <vw:CustomerView /> </DataTemplate> I substituted the angle brackets for square brackets - not sure how to post them. The code is in the MainWindowResourses.xaml and the code starts on line 19. Anyone know how I can do this in Silverlight ?? We don't have the DataType and I need to be able to tell the app that this View is associated with this ViewModel - so I can create a tab control with different view like the demo app. Cheers, EC

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• Silverlight 4 RichTextBox - can't restore Xaml with text containing curly braces

  - by fuzzyman

  We have a Silverlight application using the RichTextBox as a rich text editor for the user to create emails. We actually have our own serializer but essentially we are saving and restoring the Xaml. As far as I can tell it is impossible to restore any text containing curly braces. You can demonstrate this fairly easily by creating a RichTextBox and typing something similar to "{weird}" into it. Then take the .Xaml property of the textbox and set it on the .Xaml property of another textbox - kablooie. As we have our own serializer I have tried escaping the Text member of the Run elements with "". This makes no difference. I've tried replacing the braces with &#123; but that doesn't work either.

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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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• Delayed "rendering" of WPF/Silverlight Dependency Properties?

  - by Aardvark

  Is there a way to know the first time a Dependency Property is accessed through XAML binding so I can actually "render" the value of the property when needed? I have an object (class derived from Control) that has several PointCollection Dependency Properties that may contain 100's or 1000's of points. Each property may arrange the points differently for use in different types shapes (Polyline, Polygon, etc - its more complicated then this, but you get the idea). Via a Template different XAML objects use TemplateBinding to access these properties. Since my object uses a Template I never know what XAML shapes may be in use for my object - so I never know what Properties they may or may not bind to. I'd like to only fill-in these PointCollections when they are actually needed. Normally in .NET I'd but some logic in the Property's getter, but these are bypassed by XAML data binding. I need a WPF AND Silverlight compatible solution. I'd love a solution that avoids any additional complexities for the users of my object.

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• How to make a table in Silverlight ?

  - by Shnitzel

  So I'd like to make a visible table, with a border around each cell and a different background color for the header. I'd like to eventually insert controls into this. For example, put a textfield inside one of the table elements, or some radio buttons, etc. Is there a control for this? I've narrowed it down to two possibilities, but they both seem kind of "meh": use the Grid Control - I like this but is there a way to color the border on the cell (I did not find this) use the DataGrid Control - this control is just way too complicated for what I need. I'm just looking for an html style table in silverlight, any ideas?

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• Silverlight running in IE kiosk mode

  - by JimmySavile

  Hi, We are having a weird problem where by we are running a silveright application in IE8 kiosk mode, the shortcut is added to windows startup. The silverlight app runs on localhost. It all works fine until you reboot, IE displays "navigation to the webpage was canceled" when it loads. Yet the shortcut works fine, if you close IE and manually go into the startup folder and run the shortcut, or run the same shortcut from the desktop. I assume there is some sort of timing issue but have no idea what. Tried using 127.0.0.1 instead of localhost incase DNS hadn't been properly initialised at that point or something. Maybe an IIS initialisation problem? Anyone have any ideas? Thanks for your time

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• Silverlight getting opened site

  - by Rafal

  Hi Let's say I have a MainPage that has a buuton. I also have another page(Page2) that hase a textbox. I woud like to add a simple text "TEXT" to the textbox in Page2 while navigating by the button from MainPage. I have a problem with getting actually opened Site. In Windows Forms applications it is solved by: Page2 page2 = (Page2)Application.OpenedForms["Page2"]; page2.TextBox.Text = "TEXT"; How can i do it in Silverlight? HELP")

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• WCF(HTTPS,UserName) calling by SilverLight

  - by Andrew Kalashnikov

  Hello colleagues. I've created wcf service with transport security over HTTPS. Also I use UserName authentication as described at http://msdn.microsoft.com/en-us/library/cc949025.aspx, so I can use my Membership,RoleProvider. When I work with this service with ASP.NET all is OK var client = new RegistratorClient(); client.ClientCredentials.UserName.UserName = ConfigurationManager.AppSettings["registratorLogin"]; client.ClientCredentials.UserName.Password = ConfigurationManager.AppSettings["registratorPassword"]; But at my SilverLight appliation I can't do the same. When I try setup credntials and call wcf I get standard browser window with username and password. When I insert it SL application works well, but this message is so annoyed. I can't use clientCredentialType="Basic" at my SL config. What should I do for silence calling my WCF. Big thanks

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• Cannot play local WMV in silverlight MediElement

  - by Nick

  Hello, I am trying to play a video in WMV format in a silverlight MediaElement. <StackPanel> <Grid x:Name="LayoutRoot"> <MediaElement x:Name="media" Source="C:\Bounce.wmv" Width="300" Height="300" AutoPlay="True" /> </Grid> </StackPanel> This does nothiing.. but if I change the source attribute to point to some WMV out on the web it works. What am I doing wrong? Thanks, Nick

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• Visual Studio Performance when editing XAML/Silverlight files

  - by driAn

  When I work on Silverlight projects within Visual Studio 2008, I regularly notice that the XAML editor hangs for up to 10 seconds. This because Visual Studio consumes 100% CPU during that timeframe. Any ideas how I could fix that? I assume this is some kind of background compiling for itellisense or something similiar. It happens during editing, multiple times an hour, without me doing any special actions. System: Server 2008 Std Visual Studio 2008 SP1 latest updates... I wonder if anyone else experienced this issue. Any help would be appreciated.

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• Howto serialize a List<T> in Silverlight?

  - by Jurgen

  I have a struct called coordinate which is contained in a list in another class called segment. public struct Coordinate { public double Latitude { get; set; } public double Longtitude { get; set; } public double Altitude { get; set; } public DateTime Time { get; set; } } public class Segment { private List<Coordinate> coordinates; ... } I'd like to serialize the Segment class using the XmlSerializer using Silverlight (on Windows Phone 7). I understand from link text that XmlSerializer doesn't support List<T>. What is the advised way of serializing a resizable array coordinates? Thanks, Jurgen

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• How can I determine in silverlight code where the silverlight instance is running?

  - by Edward Tanguay

  I have a silverlight app. When I develop I have it pick up its data from a local URL: http://localhost/theapp/data/... however, when it is online, I want it to pick up its data from an online URL: http://www.tanguay.info/... Currently I have a variable which I switch before I compile and upload: bool silverlightAppIsLive = true; which I use to determine whether or not to get data from the first or second URL above. Is there a way for me to determine this automatically in code without setting the variable manually?

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• Silverlight -> WCF -> Database -> problem

  - by Billy

  Hi there, I have some silverlight code that calls a WCF service which then uses the Entity Framework to access the database and return records. Everything runs fine but ... when I replace the Entity Framework code with classic ADO.NET code I get an error: The remote server returned an error: NotFound When I call the ADO.NET code directly with a unit test it returns records fine so it's not a problem with the ADO.NEt code I used fiddler and it seems to say that the service cannot be found with a "500" error. i don't think it's anything to do with the service as the only thing I change is the technology to access the database. Anyone know what i'm missing here?

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• Asynchronous Silverlight WCF callback

  - by Matt

  I've created my own WCF service and I've successfully been able to talk to it via my Silverlight client. I ran into an interesting problem on my asynchronous callbacks though. When my callback is invoked, I can't update any UI controls with the dreaded invalid cross thread access Here's what my callback function looks like private void GetTimeCallBack( object sender, Talk.ClientBase<IService>.ClientEventArgs e ) { lblDisplay.Text = e.Object.ToString(); } A quick google search showed me that I have to do this instead. private void GetTimeCallBack( object sender, Talk.ClientBase<IService>.ClientEventArgs e ) { Dispatcher.BeginInvoke( () => lblDisplay.Text = e.Object.ToString() ); } Now everything works fine, but I wasn't expecting my callback to be running on a different thread. Will I always have to use the Dispatcher class in order to modify anything within my class or is this just limited to UI elements? I've not familiar with the Dispatcher class at all so I'm looking to understand it more.

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• Silverlight layout Best Practices

  - by JustSmith

  I'm writing a fairly big interface using Silverlight. As I progress, the xaml file is getting fairly big and is becoming proportionally uglier. Questions Are there any resources out there to make the xaml more readable? For example, how would I display the order of attributes (e.g. height and Width first) so that it looks the most tidy? Another issue is that there are multiple ways to implement an interface with grids and stack panels. Is there a preferred approach when using one or the other? I am looking for advice and links to other resources that can be used as examples.

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• Silverlight Binding to TranslateX

  - by Peanut

  I have a simple winphone7 application, but I think this would apply to any silverlight. Basically I have an ellipse and I would like to move it with the translate X and Y properties. Here is my attempt: <Ellipse Fill="#FFF4F4F5" Margin="0,0,-3,-3" Stroke="Black" RenderTransformOrigin="0.5,0.5" > <Ellipse.RenderTransform> <CompositeTransform TranslateY="{Binding Y}" TranslateX="{Binding X}"/> </Ellipse.RenderTransform> </Ellipse> I am pretty sure the Binding is set correctly; The problem is it gives me this error when I run the application: 2260 An error has occurred. [Line: 4 Position: 33] which is a XAML error. The error goes away when I comment out the composittransform line. Can anyone point me in a right direction? If you need more code let me know, i'll post more up. Thanks

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