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  • What is the difference between NavigationService.Navigate() method and PhoneApplicationFrame.Source

    - by afriza
    Taken from Exercise 1: Creating Windows Phone Applications with Microsoft Visual Studio 2010 Express for Windows Phone Task 3: Step 9 // navigate this.NavigationService.Navigate(new Uri("/PuzzlePage.xaml", UriKind.Relative)); Note: The PhoneApplicationPage class provides methods and properties to navigate to pages through its NavigationService property. You can call the Navigate method of the NavigationService and pass the URI for the page as a parameter. You can also use the GoBack and GoForward methods to navigate backward or forward in the navigation history. The hardware back button also provides backward navigation within an application. The event handler shown above uses the NavigationService to go to the PuzzlePage.xaml page. Task 4: Step 3 (RootVisual as Microsoft.Phone.Controls.PhoneApplicationFrame).Source = new Uri("/ErrorPage.xaml", UriKind.Relative); Note: ... Whenever you set the Source property to a value that is different from the displayed content, the frame navigates to the new content. ... What are the differences and similarities of both techniques?

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  • Cleanup vs Dispose(bool) in MVVM-light

    - by Budda
    In the lastest version of MVVM-light (V3 SP1) both "Dispose()" and "Dipose(bool)" methods in ViewModel class are marked Do not use this method anymore, it will be removed in a future version. Use ICleanup.Cleanup() instead Does this mean that IDisposable interface must not be implemented in all ViewModel classes that are derived from GalaSoft.MvvmLight.ViewModelBase (and cleanup must be overrided)? If yes, using can't be used for view-model instances... Probably I didn't understand something... Please clarify... What are the benefits of such cleaning up? Thanks.

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  • Using RIA Services FilterDescriptor from code behind

    - by Fermin
    Hi, I was wondering if it's possible to use the FilterDescriptor control from code behind? On the page load of my form I set the datasource of a grid in the code behind, not using a DomainDataSource control, like: TestDomainContext context = new TestDomainContext(); dataGridEmployees.ItemsSource = context.EmployeePositions; context.Load(context.GetEmployeesWithPositionQuery()); I have a textbox on my page that the user can enter into to filter on employee position. Is it now possible to add FilterDescriptor to the source of the DataGrid in code behind? Or would I manually need to filter the results of the context.GetEmployeesWithPositionQuery, for example on KeyUp event of the filter TextBox?

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  • Problem during RIA authentication

    - by VexXtreme
    Hi I've built an authentication service in RIA that inherits from DomainService and IAuthenticate. The problem is following: When LoginOperation fails (loginOperation.LoginSuccess is false) due to wrong credentials, everything is ok and it is reported to the user. However, when login succeeds, I get throw a really weird exception: {System.ServiceModel.DomainServices.Client.DomainOperationException: Load operation failed for query 'Login'. Value cannot be null. Parameter name: validationErrors --- System.ArgumentNullException: Value cannot be null. Parameter name: validationErrors at System.ServiceModel.DomainServices.Client.QueryCompletedResult..ctor(IEnumerable1 entities, IEnumerable1 includedEntities, Int32 totalCount, IEnumerable`1 validationErrors) I don't really understand this. What is IEnumerable validationErrors, where does it appear and why does it have to be != null ? This started happening after I ported my authentication services from Nhibernate to Entity Framework. I've even tried googling this exception and apparently I'm the only one with this problem so far. Any help would be greatly appreciated.

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  • DataForm commit button is not enabled when data changed.

    - by Grayson Mitchell
    This is a weird problem. I am using a dataform, and when I edit the data the save button is enabled, but the cancel button is not. After looking around a bit I have found that I have to implement the IEditableObject in order to cancel an edit. Great I did that (and it all works), but now the commit button (Save) is grayed out, lol. Anyone have any idea's why the commit button will not activate any more? Xaml <df:DataForm x:Name="_dataForm" AutoEdit="False" AutoCommit="False" CommandButtonsVisibility="All"> <df:DataForm.EditTemplate > <DataTemplate> <StackPanel Name="rootPanel" Orientation="Vertical" df:DataField.IsFieldGroup="True"> <!-- No fields here. They will be added at run-time. --> </StackPanel> </DataTemplate> </df:DataForm.EditTemplate> </df:DataForm> binding DataContext = this; _dataForm.ItemsSource = _rows; ... TextBox textBox = new TextBox(); Binding binding = new Binding(); binding.Path = new PropertyPath("Data"); binding.Mode = BindingMode.TwoWay; binding.Converter = new RowIndexConverter(); binding.ConverterParameter = col.Value.Label; textBox.SetBinding(TextBox.TextProperty, binding); dataField.Content = textBox; // add DataField to layout container rootPanel.Children.Add(dataField); Data Class definition public class Row : INotifyPropertyChanged , IEditableObject { public void BeginEdit() { foreach (var item in _data) { _cache.Add(item.Key, item.Value); } } public void CancelEdit() { _data.Clear(); foreach (var item in _cache) { _data.Add(item.Key, item.Value); } _cache.Clear(); } public void EndEdit() { _cache.Clear(); } private Dictionary<string, object> _cache = new Dictionary<string, object>(); private Dictionary<string, object> _data = new Dictionary<string, object>(); public object this[string index] { get { return _data[index]; } set { _data[index] = value; OnPropertyChanged("Data"); } } public object Data { get { return this; } set { PropertyValueChange setter = value as PropertyValueChange; _data[setter.PropertyName] = setter.Value; } } public event PropertyChangedEventHandler PropertyChanged; protected void OnPropertyChanged(string property) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(property)); } } }

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  • Unable to sync custom authentication with RIA services in SL3 + RIA implementation

    - by Nair
    I am developing SL3 + RIA services with custom authentication. I followed the example in http://code.msdn.microsoft.com/RiaServices/Release/ProjectReleases.aspx?ReleaseId=2661 to implement custom authentication. Based on the implementation, you first do login request from client to service. This request is async process. Noe the client GUI will start to bind data to SL controls using RIA services, which requires the authentication to be successful (by adding [RequireAuthentication] attribute). The trouble is, since you requested login from the main process, while it is doing authentication, the page control takes over and starts to bind data using RIA services. But the problem is authentication is not completed yet thus which ever the first service method data binding hits will fail with 'Access denied'. Bottom line is GUI is will not wait for authentication to be completed to start the data binding. My question is how do you handle this situation? Thanks,

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  • How do I add additional data to a DataGridRowGroupHeader?

    - by Jeff Yates
    I have a DataGrid that is showing some data via a PagedCollectionView with one group definition. I have created a Style for the corresponding DataGridRowGroupHeader under which I have added a ControlTemplate containing an additional TextBlock and a spacing Rectangle. I would like to bind the widths of these controls to the widths of particular columns, but I am struggling to get this working. I would also like to bind the Text property of the TextBlock to a value. I tried binding the widths via the Width property of a Rectangle in resources but this didn't work (possibly because the Rectangle was never drawn and therefore didn't calculate it's layout). However, I believe both sets of bindings can be performed with some use of one or more ValueConverter implementations, but I was wondering if there was a better way. Can any of this be achieved through the definition of a ControlTemplate?

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  • events not getting fired properly

    - by prince23
    hi, this is my xaml code. datagrid within another data grid. <sdk:DataGrid x:Name="dgLevel1" AutoGenerateColumns="False" VerticalAlignment="Top" IsReadOnly="True" Margin="12,12,0,0" RowDetailsVisibilityChanged="dgLevel1_RowDetailsVisibilityChanged" SelectionMode="Extended" RowDetailsVisibilityMode="VisibleWhenSelected" Height="412" HorizontalAlignment="Left" Width="816"> <sdk:DataGrid.Columns> <sdk:DataGridTemplateColumn> <sdk:DataGridTemplateColumn.CellTemplate> <DataTemplate> <Button x:Name="myButton" Width="24" Height="24" Click="ExpandLevel1_Click"> <Image x:Name="imgLevel1" Source="Images/detail.JPG" Stretch="None"/> </Button> </DataTemplate> </sdk:DataGridTemplateColumn.CellTemplate> </sdk:DataGridTemplateColumn> <sdk:DataGridTemplateColumn Header="Actual" Visibility="Collapsed"> <sdk:DataGridTemplateColumn.CellTemplate> <DataTemplate > <sdk:Label Content="{Binding UniqueName}" /> </DataTemplate> </sdk:DataGridTemplateColumn.CellTemplate> </sdk:DataGridTemplateColumn> <sdk:DataGridTextColumn Binding="{Binding Name}" Header="Name" Width="550" /> <!--<sdk:DataGridTextColumn Binding="{Binding UniqueName}" Visibility="Collapsed"/>--> <sdk:DataGridTemplateColumn Header="Actual" Width="80" > <sdk:DataGridTemplateColumn.CellTemplate> <DataTemplate > <sdk:Label Content="{Binding Age}" /> </DataTemplate> </sdk:DataGridTemplateColumn.CellTemplate> </sdk:DataGridTemplateColumn> </sdk:DataGrid.Columns> <sdk:DataGrid.RowDetailsTemplate> <DataTemplate> <StackPanel Width="805"> <sdk:DataGrid x:Name="dgLevel2" Width="797" Margin="17,0,0,0" HeadersVisibility ="None" AutoGenerateColumns="False" HorizontalAlignment="Center" IsReadOnly="True" RowDetailsVisibilityChanged="dgLevel2_RowDetailsVisibilityChanged" SelectionMode="Extended" RowDetailsVisibilityMode="VisibleWhenSelected"> <sdk:DataGrid.Columns> <sdk:DataGridTemplateColumn> <sdk:DataGridTemplateColumn.CellTemplate> <DataTemplate> <Button x:Name="myButton" Width="24" Height="30" Click="ExpandLevel2_Click"> <Image x:Name="imgLevel2" Source="Images/detail.JPG" Stretch="None"/> </Button> </DataTemplate> </sdk:DataGridTemplateColumn.CellTemplate> </sdk:DataGridTemplateColumn> <sdk:DataGridTextColumn Binding="{Binding School}" Width="528" /> <sdk:DataGridTextColumn Binding="{Binding College}" Visibility="Collapsed" /> <sdk:DataGridTemplateColumn Header="Actual" Width="80"> <sdk:DataGridTemplateColumn.CellTemplate> <DataTemplate > <sdk:Label Content="{Binding DOB}" /> </DataTemplate> </sdk:DataGridTemplateColumn.CellTemplate> </sdk:DataGridTemplateColumn> </sdk:DataGrid.Columns> </sdk:DataGrid> </StackPanel> </DataTemplate> </sdk:DataGrid.RowDetailsTemplate> </sdk:DataGrid> i have 2 data grid and have 2 image buttons in both the grid . but the event which is in datagrid ExpandLevel1 _Click and ExpandLevel2 _Click is not getting fired properly. some times get fired some times no when i click the button first this event gets fired then ExpandLevel1_Click then **dgLevel1_RowDetailsVisibilityChanged . same thing is happening for the datagrid 2 ExpandLevel2_Click then dgLevel2_RowDetailsVisibilityChanged** there are scenario where first datagrid event gets fired first then button click events why is this happening .is there any solution for this looking forward an solutions thanks in advance. prince

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  • Preloading multiple comboboxes/listbox itemssource with enumerated values using WCF RIA Services

    - by Dale Halliwell
    I would like to be able to load several RIA entitysets in a single call without chaining/nesting several small LoadOperations together so that they load sequentially. I have several pages that have a number of comboboxes on them. These comboboxes are populated with static values from a database (for example status values). Right now I preload these values in my VM by one method that strings together a series of LoadOperations for each type that I want to load. For example: public void LoadEnums() { context.Load(context.GetMyStatusValues1Query()).Completed += (s, e) => { this.StatusValues1 = context.StatusValues1; context.Load(context.GetMyStatusValues2()).Completed += (s1, e1) => { this.StatusValues2 = context.StatusValues2; context.Load(context.GetMyStatusValues3Query()).Completed += (s2, e2) => { this.StatusValues3 = context.StatusValues3; (....and so on) }; }; }; }; While this works fine, it seems a bit nasty. Also, I would like to know when the last loadoperation completes so that I can load whatever entity I want to work on after this, so that these enumerated values resolve properly in form elements like comboboxes and listboxes. (I think) I can't do this easily above without creating a delegate and calling that on the completion of the last loadoperation. So my question is: does anyone out there know a better pattern to use, ideally where I can load all my static entitysets in a single LoadOperation?

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  • Sorting an observable collection with linq

    - by zachary
    I have an observable collection and I sort it using linq. Everything is great, but the problem I have is how do I sort the actual observable collection? Instead I just end up with some IEnumerable thing and I end up clearing the collection and adding the stuff back in. This can't be good for performance. Does anyone know of a better way to do this?

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  • Custom MediaStreamSource and MediaElement.Naturalduration property

    - by Tilo Skomudek
    i have written a custom mediastreamsource, that can play media from growing source files (mpeg transport streams). Once it reaches the end of its mediastream, it reads the new duration from the mediafile and continues to deliver samples. The MediaElement plays continously. Unfortunately i haven´t found a way to update the MediaElement.NaturalDuration property. Hence i cannot seek into the “reloaded” area, because ME doesn´t know about it and sets my position change to its NaturalDuration value. I tried to call ReportOpenMediaCompleted after getting the new stream length. Then Naturalduration get´s updated, but i cannot play anymore. Is there any other way to deal with it ?

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  • How do you handle 'SelectedItemChanged' events in a MVVM ViewModel?

    - by Travis
    I have some logic that depends upon two properties being set, as it executes when both properties have a value. For example: private void DoCalc() { if (string.IsNullOrEmpty(Property1) || string.IsNullOrEmpty(Property2)) return; Property3 = Property1 + " " + Property2; } That code would need to be executed every time Property1 or Property2 changed, but I'm having trouble figuring out how to do it in a stylistically acceptable manner. Here are the choices as I see them: 1) Call method from ViewModel I don't have a problem with this conceptually, as the logic is still in the ViewModel - I'm not a 'No code-behind' nazi. However, the 'trigger' logic (when either property changes) is still in the UI layer, which I don't love. The codebehind would look like this: void ComboBox_Property1_SelectedItemChanged(object sender, RoutedEventArgs e) { viewModel.DoCalc(); } 2) Call method from Property Setter This approach seems the most 'pure', but it also seems ugly, as if the logic is hidden. It would look like this: public string Property1 { get {return property1;} set { if (property1 != value) { property1 = value; NotifyPropertyChanged("Property1"); DoCalc(); } } } 3) Hook into the PropertyChanged event I'm now thinking this might be the right approach, but it feels weird to hook into the property changed event in the implementing viewmodel. It would look something like this: public ViewModel() { this.PropertyChanged += new PropertyChangedEventHandler(ViewModel_PropertyChanged); } void ViewModel_PropertyChanged(object sender, PropertyChangedEventArgs e) { if (e.PropertyName == "Property1" || e.PropertyName == "Property2") { DoCalc(); } } So, my question is, if you were browsing through some source code with that requirement, which approach would you prefer to see implemented (and why?). Thanks for any input.

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  • WPF Expander Button Styled so it is inside Expander Header

    - by Burt
    I am using the expander control and have styled the header as shown in the picture below. The problem I have is that I want the expander button to be contained within the header so that the line for the end of the header template aligns with the Expander content i.e. I ultimatly want to end up with something similar to the image below. Thanks in advance.

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  • Nhibernate equivalent of LinqToEntitiesDomainService in RIA

    - by VexXtreme
    Hi, When using Entity Framework with RIA domain services, domain services are inherited from LinqToEntitiesDomainService, which, I suppose, allows you to make linq queries on a low level (client-side) which propagate into ORM; meaning that all queries are performed on the database and only relevant results are retrieved to the server and thus the client. Example: var query = context.GetCustomersQuery().Where(x => x.Age > 50); Right now we have a domain service which inherits from DomainService, and retrieves data through NHibernate session as in: virtual public IQueryable<Customer> GetCustomers() { return sessionManager.Session.Linq<Customer>(); } The problem with this approach is that it's impossible to make specific queries without retrieving entire tables to the server (or client) and filtering them there. Is there a way to make linq querying work with NHibernate over RIA like it works with EF? If not, we're willing to switch to EF because of this, because performance impact would be just too severe. Thanks

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  • WPF Control validation

    - by Jon
    Hi all, I'm developing a WPF GUI framework and have had bad experiences with two way binding and lots of un-needed events being fire(mainly in Flex) so I have gone down the route of having bindings (string that represent object paths) in my controls. When a view is requested to be displayed the controller loads the view, and gets the needed entities (using the bindings) from the DB and populates the controls with the correct values. This has a number of advantages i.e. lazy loading, default undo behaviour etc. When the data in the view needs to be saved the view is passed back to the controller again which basically does the reserve i.e. re-populates the entities from the view if values have changed. However, I have run into problems when I try and validate the components. Each entity has attributes on its properties that define validation rules which the controller can access easily and validate the data from the view against it. The actual validation of data is fine. The problem comes when I want the GUI control to display error validation information. It I try changing the style I get errors saying styles cannot be changed once in use. Is the a way in c# to fire off the normal WPF validation mechanism and just proved it with the validaiton errors the controller has found? Thanks in advance Jon

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  • Change the background image of a Button when pressed using VisualStateManager

    - by Thomas Joulin
    I have this button : <Button x:Name="PrevAdIcon" Tag="-1" Visibility="Collapsed" Width="80" Height="80" Click="PrevAd"> <Button.Background> <ImageBrush AlignmentY="Top" Stretch="None" ImageSource="/Images/prev.png"></ImageBrush> </Button.Background> </Button> How can I change the background to /Images/prev-selected.png when a user pressed the button ? It'll give him a feedback, since it's a WP7 app what I have so far (not working) : <vsm:VisualState x:Name="Pressed"> <Storyboard> <ObjectAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="Background" Storyboard.TargetProperty="Background"> <DiscreteObjectKeyFrame KeyTime="0"> <DiscreteObjectKeyFrame.Value> <ImageBrush ImageSource="/Images/prev-selected.png" Stretch="Fill"/> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames> </Storyboard> </vsm:VisualState>

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  • Casting in MVVM Light CommandParameterValue

    - by user275561
    here is my Problem, I want to pass the integer 1 when this canvas is pressed. Every time I click the canvas, I get a An unhandled exception of type 'System.InvalidCastException' occurred in GalaSoft.MvvmLight.dll. Now I could make my life easier and just do the RelayCommand to accept a String instead of int but for the sake of learning. How would i go about doing it this way, <i:Interaction.Triggers> <i:EventTrigger EventName="MouseLeftButtonDown"> <cmd:EventToCommand Command="{Binding ButtonPress}" CommandParameterValue="1" </i:EventTrigger> </i:Interaction.Triggers>

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  • MVVM Binding Selected RadOutlookBarItem

    - by Christian
    Imagine: [RadOutlookBarItem1] [RadOutlookBarItem2] [RadOutlookBar] [CONTENCONTROL] What i want to achieve is: User selects one of the RadOutlookBarItem's. Item's tag is bound like: Tag="{Binding SelectedControl, Mode=TwoWay}" MVVM Property public string SelectedControl { get { return _showControl; } set { _showControl = value; OnNotifyPropertyChanged("ShowControl"); } } ContentControl has multiple CustomControls and Visibility of those is bound like: <UserControl.Resources> <Converters:BoolVisibilityConverter x:Key="BoolViz"/> </UserControl.Resources> <Grid x:Name="LayoutRoot" Background="White"> <Views:ViewDocumentSearchControl Visibility="{Binding SelectedControl, Converter={StaticResource BoolViz}, ConverterParameter='viewDocumentSearchControl'}"/> <Views:ViewStartControl Visibility="{Binding SelectedControl, Converter={StaticResource BoolViz}, ConverterParameter='viewStartControl'}"/> </Grid> Converter: public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { // here comes the logic part... should return Visibility.Collapsed : Visibility.Visible based on 'object value' value System.Diagnostics.Debugger.Break(); return Visibility.Collapsed; } now, logically the object value is always set to null. So here's it comes to my question: How can i put a value into the SelectedControl Variable for the RadOutlookBarItem's Tag. I mean something like Tag="{Binding SelectedControl, Mode=TwoWay, VALUE='i.e.ControlName'"} So that i can decide, using the Convert Method, whether a specific Control's visibility is either set to collapsed or visible? help's appreciated Christian

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  • Having ObservableCollection Trigger an update

    - by user275561
    So i have something along the lines of private ObservableCollection<ViewModel> _internal; public ObservableCollection<ViewModel> BoundInternal{get;set}; //this is Binded in the Itemssource like ItemSource={Binding BoundInternal} Now In my code i do something like BoundInternal=_internal, However the problem is the BoundInternal isn't trigger any collectionChanged event. I have to use the Add method. So I am wondering if there is a solution to this.

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  • Is it possible to make customizable WPF styles?

    - by Dheeraj Kumar
    I really like WPF because of its awesome skinning support by changing resourcedictionaries on the fly, but the catch is, the styles must be made by designers in XAML. My client needs a skinnable UI where the end users can make skins themselves. My question is - In Photoshop, you can take any image, and add a color overlay to change all the colors to that hue. Can you do something similar in WPF? I'm just a beginner, and looking at several WPF styles, it seems like all the color values are hard-coded. Here's a sample scenario - user selects two colors from color pickers, and all the controls have a gradient background from Color1 to Color2.

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  • Using Moq at Blend design time

    - by adrian hara
    This might be a bit out there, but suppose I want to use Moq in a ViewModel to create some design time data, like so: public class SomeViewModel { public SomeViewModel(ISomeDependency dependency) { if (IsInDesignMode) { var mock = new Mock<ISomeDependency>(); dependency = mock.Object; // this throws! } } } The mock could be set up to do some stuff, but you get the idea. My problem is that at design-time in Blend, this code throws an InvalidCastException, with the message along the lines of "Unable to cast object of type 'Castle.Proxies.ISomeDependencyProxy2b3a8f3188284ff0b1129bdf3d50d3fc' to type 'ISomeDependency'." While this doesn't necessarily look to be Moq related but Castle related, I hope the Moq example helps ;) Any idea why that is? Thanks!

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  • Silverlight4 disable textbox required validation when form loads with initial value (null)

    - by Jay
    I am trying to implement validation using IDataErrorInfo or INotifyDataErrorInfo but either way I am struggling to make it work only once user start entering data or clicking save button. Since I am using MVVM, I am setting my view's datacontext to ViewModel and my ViewModel is implementing IDataErrorInfo / INotifyDataErrorInfo. I need to make sure validation happens but not when form loads up. Anyone has got any suggestion how I can implement? Thanks

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  • How to use join in EntityQuery,.. using RIA and Entities

    - by mian
    Hi i use the following patterh for fetching data using RIA objTestAppContext is an instance of LinqToEntitiesDomainService class EntityQuery query = from tmpTable in objTestAppContext.GteOrdrs() where tmpTable.orderID == d select tmpTable; Now scenerio is ,, that I also have a OrderDetail entity in EDMS which is attached to he Order as orderID in OrderDetails which is managed by the association set named as FK_orderdetals_orders. Please tell how can i use join in the "query"

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