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  • When NOT to use MVVM?

    - by Vitalij
    I have started using MVVM pattern recently. I have had several projects where I used it and with every new one, I start to see that it will fit great within that new project. And now I start to ask myself are there situation when it's better NOT to use MVVM. Or is it such a nice pattern which you can use anywhere? Could you please describe several scenarios where MVVM wouldn't be the best choice?

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  • Accessing properties through Generic type parameter

    - by Veer
    I'm trying to create a generic repository for my models. Currently i've 3 different models which have no relationship between them. (Contacts, Notes, Reminders). class Repository<T> where T:class { public IQueryable<T> SearchExact(string keyword) { //Is there a way i can make the below line generic //return db.ContactModels.Where(i => i.Name == keyword) //I also tried db.GetTable<T>().Where(i => i.Name == keyword) //But the variable i doesn't have the Name property since it would know it only in the runtime //db also has a method ITable GetTable(Type modelType) but don't think if that would help me } } In MainViewModel, I call the Search method like this: Repository<ContactModel> _contactRepository = new Repository<ContactModel>(); public void Search(string keyword) { var filteredList = _contactRepository.SearchExact(keyword).ToList(); } I use Linq-To-Sql.

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  • TargetInvocationException?

    - by Mark
    Why would these lines of code cause that exception private Dispatcher dispatcher = null; public DownloadManager(Dispatcher dispatcher = null) { this.dispatcher = dispatcher ?? Dispatcher.CurrentDispatcher; } When the DownloadManager is instantiated in the XAML like <Window.DataContext> <c:DownloadManager /> </Window.DataContext> ?

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  • How do I set the height of a floating div in CSS?

    - by indieinvader
    I have two floating divs, each is 50% wide, the problem I have is that I can't get them to stretch to the full height of the window. Essentially I want each div to have 50% width and 100% height (but it isn't working) html <section> <div></div> </section> <section> <div></div> </section> css section { background: black; width: 50%; min-height: 100%; height: 100%; margin: 0; float: left; } section > div { height: 100%; }

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  • How to draw N first elements?

    - by noober
    Hello all, There is a canvas element with 10 children (polygons). There is a number in my code from 1 to 10. I'd like to draw the first N elements from the children elements, base on my number. It would be the best solution to do this from XAML with a minimum code-behind like this: ... MyCanvas.N = 5; ...

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  • Rotating Cursor According to Rotated TextBox

    - by j-t-s
    Hi All I have a TextBox that I allow my users to rotate. But what I would LOVE for my users is to have their Cursor rotate to the same angle that the TextBox was rotated at. For example, if they rotated the TextBox to 28°, then when the Cursor enters that TextBox the Cursor should also rotate itself to 28°. Any help at all will be greatly appreciated. Thank you :)

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  • How can I bind dynamic data to DataGridTemplateColun in code?

    - by TuomoT
    I'm using DataGrid from CodePlex. I have objects (ICustomTypeDescriptor) that have properties 'name' 'description' 'c' 'd' and so on (the names are dynamic, and so is the value) and they have information behind them. I have templates for different types. And if I have to list the properties of a single element I can just bind to the values in xaml and use datatemplateselector (in datagridtemplatecolumn) which will pick the correct template. However, when I'm listing several of the elements, how can I use the selectors and the templates? How do I get the correct property bound to the template (two-way)? When ignoring the need for different templates, using DataGridTextColumn with bindings is very simple (and works, see example below), is there any way to use similar approach with the DataGridTemplateColumn? foreach (String propertyName in listOfPropertyNames) { DataGridTextColumn textColumn = new DataGridTextColumn() { Header = propertyName, Binding = new Binding() { Path = new PropertyPath(propertyName) } }; DataGrid.Columns.Add(textColumn); }

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  • Set ListBoxItem.IsSelected when child TextBox is Focused

    - by jpsstavares
    Hi, I have a typical MVVM scenario: I have a ListBox that is binded to a List of StepsViewModels. I define a DataTemplate so that StepViewModels are rendered as StepViews. The StepView UserControl have a set of labels and TextBoxs. What I want to do is to select the ListBoxItem that is wrapping the StepView when a textBox is focused. I've tried to create a style for my TextBoxs with the following trigger: <Trigger Property="IsFocused" Value="true"> <Setter TargetName="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ListBoxItem}}}" Property="IsSelected" Value="True"/> </Trigger> But I get an error telling me that TextBoxs don't have an IsSelected property. I now that but the Target is a ListBoxItem. How can I make it work?

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  • Empty String Check in Trigger

    - by Asim Sajjad
    How can I check the empty string in triggers <Trigger Property="Source" SourceName="ControlName" Value=""> <Setter Property="Height" Value="0" TargetName="ControlName" /> </Trigger> I have set the Height of the Control to 0 if the source of the imageControl is empty stirnr or not set? How can I do it, Basically If the image is not set then I want to hide the image control in the template. thanks in advance.

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  • Binding PropertyName of CollectionViewSource SortDescription in Xaml

    - by Faisal
    Here is my xaml that tells the collectionviewsource sort property name. <CollectionViewSource Source="{Binding Contacts}" x:Key="contactsCollection" Filter="CollectionViewSource_Filter"> <CollectionViewSource.SortDescriptions> <scm:SortDescription PropertyName="DisplayName" /> </CollectionViewSource.SortDescriptions> </CollectionViewSource> The xaml above works fine but problem I have is that I don't know how to give a variable value to SortDescription PropertyName. I have a property in my viewmodel that tells which property to sort on but I am not able to bind this property to SortDescription's PropertyName field. Is there any way?

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  • Additional information with widgets in django

    - by fromclouds
    I am displaying a django widget, with which I need to display additional information (something like a tool tip) that is attendant to the widget. I essentially have a widget that asks a random question, which is self contained. {{ form.fieldname }} displays the full widget which looks something like (à la the widget's render method): <label for="id_answer">Question:</label> <input type="hidden" name="question_id" value="n" /> <span class="prompt">What is the air-speed velocity of an unladen swallow?</span> <input type="text" name="answer" /> What I'm essentially asking is, is there a way to break out the prompt, so that I can lay the widget out piecemeal? I would like to lay it out not with a call to {{ form.fieldname }} as above, but like: {{ form.fieldname.label }} {{ form.fieldname.prompt }} {{ form.fieldname }} Does anyone know how to do this?

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  • Iframe problem with IE6 & IE7

    - by Kamiel
    Hi all, I'm experiencing difficulties getting my iframe to display correctly in IE6 & IE7. www.e-g-t.nl I think IE has the height of the iframe stretched to far beyond the 400px height I set it to be, and the content is vertically centered. I'm not an expert at css or html for that matter and don't seem to get it right. In IE8 though, the problem doesn't seem to exist. Any help on this is much appreciated!

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  • ListBox content does not resize when window is made smaller

    - by DamonGant
    I'm using .NET 4.0 (not .NET 4.0 CP) and have run into this kinda unique issue. I created a ListBox to display bound elements, first off here is (a part) of my XAML. <Grid Grid.Row="2" Background="#EEEEEE"> <Border Margin="6,10,10,10" BorderBrush="#666666" BorderThickness="1"> <ListBox ItemsSource="{Binding}" Name="appList" BorderThickness="0" HorizontalContentAlignment="Stretch" HorizontalAlignment="Stretch"> <ItemsControl.ItemTemplate> <DataTemplate> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="80" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> <Border Grid.Column="0" Margin="5" BorderThickness="3" CornerRadius="2" BorderBrush="Black" HorizontalAlignment="Left" VerticalAlignment="Top" x:Name="ItemBorder"> <Image Width="64" Height="64" Source="{Binding Path=IconUri}" Stretch="UniformToFill" /> </Border> <StackPanel Margin="0,5,5,5" Grid.Column="1" Orientation="Vertical" HorizontalAlignment="Stretch"> <TextBlock FontSize="18" Text="{Binding Path=DisplayName}" /> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="60"/> </Grid.ColumnDefinitions> <ProgressBar Grid.Column="0" Height="24" HorizontalAlignment="Stretch" IsIndeterminate="{Binding Path=IsDiscovering}" Value="{Binding Path=PercentageDownloaded}" /> <TextBlock Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Center"><TextBlock x:Name="percentageDownloaded" /><TextBlock x:Name="percentageMeter">%</TextBlock></TextBlock> </Grid> </StackPanel> </Grid> <DataTemplate.Triggers> <DataTrigger Binding="{Binding Path=IsDiscovering}"> <DataTrigger.Value>True</DataTrigger.Value> <Setter TargetName="percentageDownloaded" Property="Text" Value="N/A" /> <Setter TargetName="percentageMeter" Property="Visibility" Value="Collapsed" /> </DataTrigger> <DataTrigger Binding="{Binding Path=IsDiscovering}"> <DataTrigger.Value>False</DataTrigger.Value> <Setter TargetName="percentageDownloaded" Property="Text" Value="{Binding Path=PercentageDownloaded}" /> <Setter TargetName="percentageMeter" Property="Visibility" Value="Visible" /> </DataTrigger> </DataTemplate.Triggers> </DataTemplate> </ItemsControl.ItemTemplate> </ListBox> </Border> </Grid> Sizing the window up stretches the ListBox content just fine, but when I size it down, it retains it's width and spawns vertical scrollbars.

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  • Stretch ListBox Items hit area to full width if the ListBox?

    - by Nicholas
    I've looked around for an answer on this, but the potential duplicates are more concerned with presentation than interaction. I have a basic list box, and each item's content is a simple string. The ListBox itself is stretched to fill it's grid container, but each ListBoxItem's hitarea does not mirror the ListBox width. It looks as if the hitarea (pointer contact area) for each item is only the width of the text content. How do I make this stretch all the way across, regardless of the text size. I've set HorizontalContentAlignment to Stretch, but this doesn't solve my problem. My only other guess is that the content is actually stretching, but the background is invisible and so not capturing the mouse pointer. <ListBox Grid.Row="1" x:Name="ProjectsListBox" DisplayMemberPath="Name" ItemsSource="{Binding Path=Projects}" SelectedItem="{Binding Path=SelectedProject}" HorizontalContentAlignment="Stretch"/> The XAML is pretty straight forward on this. If I mouse over the text in one of the items, then the entire width of the item becomes active. I guess I just need to know how to create an interactive background that is invisible.

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  • How to design parts of the application in XAML and how to reusing it then?

    - by MartyIX
    I'm working on a main window in my application and I would like to design parts of my window separately in Visual Studio designer. Main window Game desk (actually more of them and therefore it would be nice to design the game desk, mark it as a resource and then just via simple code (something like creating a new object and setting DataContext) create it. Console And so on Is it possible in VS to do this thing? I just need to know what to look for if it is possible. I don't need a whole solution. Thank you for suggestions!

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  • EventAggregator, is it thread-safe?

    - by pfaz
    Is this thread-safe? The EventAggregator in Prism is a very simple class with only one method. I was surprised when I noticed that there was no lock around the null check and creation of a new type to add to the private _events collection. If two threads called GetEvent simultaneously for the same type (before it exists in _events) it looks like this would result in two entries in the collection. /// <summary> /// Gets the single instance of the event managed by this EventAggregator. Multiple calls to this method with the same <typeparamref name="TEventType"/> returns the same event instance. /// </summary> /// <typeparam name="TEventType">The type of event to get. This must inherit from <see cref="EventBase"/>.</typeparam> /// <returns>A singleton instance of an event object of type <typeparamref name="TEventType"/>.</returns> public TEventType GetEvent<TEventType>() where TEventType : EventBase { TEventType eventInstance = _events.FirstOrDefault(evt => evt.GetType() == typeof(TEventType)) as TEventType; if (eventInstance == null) { eventInstance = Activator.CreateInstance<TEventType>(); _events.Add(eventInstance); } return eventInstance; }

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  • Activate window/application

    - by LnDCobra
    I have implemented a Splash Screen according to WiredPrairie unmanaged c++ splasher class. But not when my application loads, my window isn't activated. The user has to click on the login box even thought it is the only window open in my application. I have tried the following but none of these work. Topmost = true; Focus(); Activate(); Is there any way to give my login window focus when the application starts? Sometimes the window behind it has focus! (Visual Studio if run on my machine), Explorer or a different application window on other peoples machines. Anyone have any idea?

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  • How do I get a title or some text to appear in a Silverlight mediaplayer when switching to FullScree

    - by Matt
    I am working on an ASP.NET website with VB.NET code-behind. I have a Silverlight mediaplayer object on one of the pages and the user may view that video in FullScreen mode. When changing to full-screen mode they are losing the title and chapter of the video series they are viewing. I have tried accessing properties and searched the web for examples on how I could put a title or some text over the player when in FullScreen mode to give the user an indication of where they are currently at while viewing each video. I am using OnClientMediaEnded to move through the videos after each video has ended so they are able to watch the whole series once in FullScreen mode. I am using a call to javascript in with this method to do that and want to know if there is any way to get a title or text up there and then change once the video switches to the next in the series? The controls on the player also go away when going into FullScreen mode so any help with that would be greatly appreciated as well. Thanks

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  • Ensure that my C# desktop application is making requests to my ASP .NET MVC action?

    - by Mathias Lykkegaard Lorenzen
    I've seen questions that are almost identical to this one, except minor but important differences that I would like to get detailed. Let's say that I have a controller and an action method in MVC which therefore accepts requests on the following URL: http://example.com/api/myapimethod?data=some-data-here. This URL is then being called regularly by 1000 clients or more spread out in the public. The reason for this is crowdsourcing. The clients around the globe help feed a global cache on my server, which makes it faster for the rest of the clients to fetch the data. Now, if I'm sneaky (and I am), I can go into Fiddler, Ethereal, Wireshark or any other packet sniffing tool and figure out which requests the program is making. By figuring that out, I can also replicate them, and fill the service with false corrupted data. What is the best approach to ensuring that the data received in my ASP .NET MVC action method is actually from the desktop client application, and not some falsely generated data that the user invented? Since it is all based on crowdsourcing, would it be a good idea for my users to be able to "vote" if some data is falsified, and then let an automatic cleanup commence if there are enough votes? I do not have access to a tool like SmartAssembly, so unfortunately my .NET program is fully decompilable. I realize this might be impossible to accomplish in an error-proof manner, but I would like to know where my best chances are.

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  • Showing Loading screen during REST service request in android app ?

    - by sat
    Currently here is what I am following, As soon as my app is launched, I have to send a request for REST service, It will take little time , so I thought of showing loading screen, In onCreate() of my Activity , first thing will be to show loading screen(progress dialog) , And I kick off the background Activity using AsyncTask , i.e. requesting for REST service and onPostexecute() I close the dialog and then I do setContentView(myxml); and update the UI . Can this approach be improved ? Problem which I faced was , Sometimes , Garbage collector may start(due to various reasons) and my app hangs at loading screen forever , because of Garbage collector , even request for REST service is not sent and because of it some wake up call comes and rest is disaster and Force close. But sometimes even ForceClose doesnot come fast , may be because of GC. so I cannot even go back and stuck in loading screen. Only thing which I can do at that point is to come back HOME. After that If I come back to my app its still loading , so definitely this approach seems to be a bad design. Whats the right approach ?

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  • How to write a custom control, which can auto resize just like TextBox in a grid cell?

    - by Cooper.Wu
    I have tried to override MeasureOverride, but the available size will not change when i resize a grid. which contains my control. class MyFrameworkElement : FrameworkElement { override Size MeasureOverride(Size available) { this.Width = available.Width; this.Height = available.Width this.UpdateLayout(); // do something... } } This works only when application start. How to implement a auto resize control, just like a TextBox in a grid cell. The TextBox will auto resize to fill grid cell if grid resized.

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