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  • Entity Framework 4 Code First and the new() Operator

    - by Eric J.
    I have a rather deep hierarchy of objects that I'm trying to persist with Entity Framework 4, POCO, PI (Persistence Ignorance) and Code First. Suddenly things started working pretty well when it dawned on me to not use the new() operator. As originally written, the objects frequently use new() to create child objects. Instead I'm using my take on the Repository Pattern to create all child objects as needed. For example, given: class Adam { List<Child> children; void AddChildGivenInput(string input) { children.Add(new Child(...)); } } class Child { List<GrandChild> grandchildren; void AddGrandChildGivenInput(string input) { grandchildren.Add(new GrandChild(...)); } } class GrandChild { } ("GivenInput" implies some processing not shown here) I define an AdamRepository like: class AdamRepository { Adam Add() { return objectContext.Create<Adam>(); } Child AddChildGivenInput(Adam adam, string input) { return adam.children.Add(new Child(...)); } GrandChild AddGrandchildGivenInput(Child child, string input) { return child.grandchildren.Add(new GrandChild(...)); } } Now, this works well enough. However, I'm no longer "ignorant" of my persistence mechanism as I have abandoned the new() operator. Additionally, I'm at risk of an anemic domain model since so much logic ends up in the repository rather than in the domain objects. After much adieu, a question: Or rather several questions... Is this pattern required to work with EF 4 Code First? Is there a way to retain use of new() and still work with EF 4 / POCO / Code First? Is there another pattern that would leave logic in the domain object and still work with EF 4 / POCO / Code First? Will this restriction be lifted in later versions of Code First support? Sometimes trying to go the POCO / Persistence Ignorance route feels like swimming upstream, other times it feels like swimming up Niagra Falls.

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  • collapsible listview

    - by Anirudh Goel
    i want to make the listview control collapsible to the groups alone. Like in Vista's My Computer, where only the group names are shown and then we click on the group to expand it. I am using VB.NET 3.5

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  • watin attachto Embedded browser

    - by MHop
    I have a c# windows form project using watin. I would love to attach to the web-browser control on a form, is this possible? Is there any sample code on how to attach to the embedded web-browser control. //Looks like this only works for actual IExplorer instances. window = WatiN.Core.Browser.AttachTo(WatiN.Core.Find.ByTitle("Google"));

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  • WPF: adding Style to a slider

    - by user279244
    Hi I am using a Slider and putting a style element over it as follows... But however, I am not able to figure out why the style is not getting reflected. The RepeatButtons are not still visible. Thanks in advance <ResourceDictionary> <LinearGradientBrush x:Key="Stroke_Gradient" EndPoint="0.5,1" StartPoint="0.5,0"> <GradientStop Color="#FF6E6E6E" Offset="0"/> <GradientStop Color="#FFFFFFFF" Offset="0.496"/> <GradientStop Color="#FF6E6E6E" Offset="1"/> </LinearGradientBrush> <Style x:Key="ScrollBar_RepeatButtonStyle1" d:IsControlPart="True" TargetType="{x:Type RepeatButton}"> <Setter Property="Background" Value="#FF6E6E6E"/> <Setter Property="BorderBrush" Value="#FFFFFFFF"/> <Setter Property="IsTabStop" Value="false"/> <Setter Property="Focusable" Value="false"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type RepeatButton}"> <Grid> <Rectangle Fill="{TemplateBinding Background}" Stroke="{TemplateBinding BorderBrush}" StrokeThickness="{TemplateBinding BorderThickness}"/> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> <ImageBrush x:Key="zoomBkgrnd" TileMode="None" ImageSource="zoombg.png" Stretch="Uniform"/> <Style x:Key="{x:Type Slider}" TargetType="{x:Type Slider}"> <Setter Property="Background" Value="{StaticResource zoomBkgrnd}"/> <Setter Property="BorderBrush" Value="{StaticResource zoomBkgrnd}"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Slider}"> <Grid x:Name="GridRoot"> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto"/> </Grid.RowDefinitions> <!-- TickBar shows the ticks for Slider --> <TickBar Visibility="Collapsed" x:Name="TopTick" Height="4" SnapsToDevicePixels="True" Placement="Top" Fill="{StaticResource zoomBkgrnd}"/> <Border Grid.Row="1" Margin="0" x:Name="Border" Height="4" Background="{StaticResource zoomBkgrnd}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="2"/> <!-- The Track lays out the repeat buttons and thumb --> <Track Grid.Row="1" x:Name="PART_Track"> <Track.Thumb> <Thumb Width="10" Height="20" /> </Track.Thumb> <Track.IncreaseRepeatButton> <RepeatButton Style="{DynamicResource ScrollBar_RepeatButtonStyle1}" Command="Slider.IncreaseLarge"/> </Track.IncreaseRepeatButton> <Track.DecreaseRepeatButton> <RepeatButton Style="{DynamicResource ScrollBar_RepeatButtonStyle1}" Command="Slider.DecreaseLarge"/> </Track.DecreaseRepeatButton> </Track> <TickBar Visibility="Collapsed" Grid.Row="2" x:Name="BottomTick" Height="4" SnapsToDevicePixels="True" Placement="Bottom" Fill="{TemplateBinding Foreground}"/> </Grid> <ControlTemplate.Triggers> <Trigger Property="TickPlacement" Value="TopLeft"> <Setter Property="Visibility" Value="Visible" TargetName="TopTick"/> </Trigger> <Trigger Property="TickPlacement" Value="BottomRight"> <Setter Property="Visibility" Value="Visible" TargetName="BottomTick"/> </Trigger> <Trigger Property="TickPlacement" Value="Both"> <Setter Property="Visibility" Value="Visible" TargetName="TopTick"/> <Setter Property="Visibility" Value="Visible" TargetName="BottomTick"/> </Trigger> <Trigger Property="IsEnabled" Value="false"> <Setter Property="Background" Value="{StaticResource zoomBkgrnd}" TargetName="Border"/> <Setter Property="BorderBrush" Value="{StaticResource zoomBkgrnd}" TargetName="Border"/> </Trigger> <!-- Use a rotation to create a Vertical Slider form the default Horizontal --> <Trigger Property="Orientation" Value="Vertical"> <Setter Property="LayoutTransform" TargetName="GridRoot"> <Setter.Value> <RotateTransform Angle="-90"/> </Setter.Value> </Setter> <!-- Track rotates itself based on orientation so need to force it back --> <Setter TargetName="PART_Track" Property="Orientation" Value="Horizontal"/> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> </ResourceDictionary>

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  • JPA/Hibernate and MySQL transaction isolation level

    - by armandino
    I have a native query that does a batch insert into a MySQL database: String sql = "insert into t1 (a, b) select x, y from t2 where x = 'foo'"; EntityTransaction tx = entityManager.getTransaction(); try { tx.begin(); int rowCount = entityManager.createNativeQuery(sql).executeUpdate(); tx.commit(); return rowCount; } catch(Exception ex) { tx.rollback(); log.error(...); } This query causes a deadlock: while it reads from t2 with insert .. select, another process tries to insert a row into t2. I don't care about the consistency of reads from t2 when doing an insert .. select and want to set the transaction isolation level to READ_UNCOMMITTED. How do I go about setting it in JPA backed by Hibernate?

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  • Populating Tcl Treeview with Sqlite Data

    - by DFM
    Hello: I am building a Tcl application that reads off of a Sqlite Db. Currently, I can enter data into the database using the Tcl frontend. Now, I am trying to figure out how to display the data within the Sqlite Db from the Tcl frontend. After a little bit of research, I found that the treeview widget would work well for my needs. I now have the following code: set z1 [ttk::treeview .c1.t1 -columns {1 2} -show headings] $z1 heading #1 -text "First Name" $z1 heading #2 -text "Last Name" proc Srch {} {global z1 sqlite3 db test.db pack $z1 db close } When the "Srch" procedure is executed (button event), the treeview (z1) appears with the headings First Name and Last Name. Additionally, the Sqlite Db gets connected, then closes. I wanted to add code that would populate the treeview from the Sqlite Db between connecting to the Db and packing the treeview (z1). Does anyone know the correct syntax to populate a Tcl treeview with data from Sqlite? Thank you everyone in advance, DFM

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  • Localization in Silverlight 4 using ResourceWrapper

    - by Artur
    I have a business application (created from template) and I can change language dynamically by making ResourceWrapper INotifyPropertyChanged and then adding in code: private void Language_SelectionChanged(object sender, SelectionChangedEventArgs e) { Thread.CurrentThread.CurrentCulture = new CultureInfo(((ComboBoxItem)((ComboBox)sender).SelectedItem).Tag.ToString()); Thread.CurrentThread.CurrentUICulture = new CultureInfo(((ComboBoxItem)((ComboBox)sender).SelectedItem).Tag.ToString()); ((ResourceWrapper)App.Current.Resources["ResourceWrapper"]).ApplicationStrings = new ApplicationStrings(); } this works fine on resources referenced/binded in xaml files (i.e. MainPage frame), but it does not update references of anything I have declared in code i.e. InfoLabel.Content = ApplicationStrings.SomeString At the moment I'm not using ResourceWrapper. My question here is how can I change my code so it uses it and updates when ResourceWrapper change. I tried: InfoLabel.Content = ((ResourceWrapper)App.Current.Resources["ResourceWrapper"]) .ApplicationStrings.SomeString but it doesn't work. Any ideas?

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  • Refresh MKAnnotationView on a MKMapView

    - by Konstantin
    I'd like to a-synchronically load images for my custom MKAnnotationView; I'm already using the EGOImageView-framework (it goes very well with UITableViews), but I fail to make it work on MKMapView. Images seem to be loaded, but I cannot refresh them on the map - [myMap setNeedsDisplay] does nothing.

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  • Program received signal: “0”. warning: check_safe_call: could not restore current frame

    - by Kaushik
    Require urgent help!:( i m developing a game and i m dealing with around 20 images at the same time. As per my knowledge, i m allocating and deallocating the images at right places. Game runs for around 15 min fine but quits with an error message: "Program received signal: “0”. warning: check_safe_call: could not restore current frame" i also tried debugging with memory leak tools provided in Xcode but could not find any issue with memory management or any increase in memory size on simulator it works fine but not on the device. i m confused wht can be the issue. Any help is appreciated. Thanx in advance

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  • Prevent Python from caching the imported modules

    - by Olivier
    While developing a largeish project (split in several files and folders) in Python with IPython, I run into the trouble of cached imported modules. The problem is that instructions import module only reads the module once, even if that module has changed! So each time I change something in my package, I have to quit and restart IPython. Painful. Is there any way to properly force reloading some modules? Or, better, to somehow prevent Python from caching them? I tried several approaches, but none works. In particular I run into really, really weird bugs, like some modules or variables mysteriously becoming equal to None... The only sensible resource I found is Reloading Python modules, from pyunit, but I have not checked it. I would like something like that. A good alternative would be for IPython to restart, or restart the Python interpreter somehow. So, if you develop in Python, what solution have you found to this problem?

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  • Customizing Django form widgets? - Django

    - by RadiantHex
    Hi folks, I'm having a little problem here! I have discovered the following as being the globally accepted method for customizing Django admin field. from django import forms from django.utils.safestring import mark_safe class AdminImageWidget(forms.FileInput): """ A ImageField Widget for admin that shows a thumbnail. """ def __init__(self, attrs={}): super(AdminImageWidget, self).__init__(attrs) def render(self, name, value, attrs=None): output = [] if value and hasattr(value, "url"): output.append(('<a target="_blank" href="%s">' '<img src="%s" style="height: 28px;" /></a> ' % (value.url, value.url))) output.append(super(AdminImageWidget, self).render(name, value, attrs)) return mark_safe(u''.join(output)) I need to have access to other field of the model in order to decide how to display the field! For example: If I am keeping track of a value, let us call it "sales". If I wish to customize how sales is displayed depending on another field, let us call it "conversion rate". I have no obvious way of accessing the conversion rate field when overriding the sales widget! Any ideas to work around this would be highly appreciated! Thanks :)

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  • Help Understanding Enumerable.Join Method

    - by lush
    Yesterday I posted this question regarding using lambdas inside of a Join() method to check if 2 conditions exist across 2 entities. I received an answer on the question, which worked perfectly. I thought after reading the MSDN article on the Enumerable.Join() method, I'd understand exactly what was happening, but I don't. Could someone help me understand what's going on in the below code (the Join() method specifically)? Thanks in advance. if (db.TableA.Where( a => a.UserID == currentUser ) .Join( db.TableB.Where( b => b.MyField == someValue ), o => o.someFieldID, i => i.someFieldID, (o,i) => o ) .Any()) { //... }

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  • Managing a file-based public maven repository

    - by Roland Ewald
    I am looking for an easy way to manage a public file-based Maven repository. While we are using the open-source version of Artifactory internally, we now want to put a file-based repository of our published artifacts (and their dependencies) on a separate machine that is publicly available. There are several ways how to do this, but none of them seems ideal: Use Maven Dependency plugin: if it is configured correctly and executed with the goal dependency:copy-dependencies for the release-module of our project, it creates a local repository structure that is fine, but this structure does not contain the meta-data.xml files, nor the hash-sums. Use Artifactory to export repo: AFAIK Artifactory only allows to export a repository as a whole. This would include the non-published modules from our project (which would then need to be deleted manually). Also, all dependencies are sitting in another repository, so this needs to be done twice, and many dependencies are not even required by a published artifact (only by artifacts that are still for internal use only). Nevertheless, this method would also include the meta-data.xml files and the hash-sums for all files. To set up an initial version of the repository, I used a mixture of both methods: I first created the Maven repository for all required dependencies via dependency:copy-dependencies and then wrote a script to cherry-pick the meta-data.xml files (etc.) from Artifactory. This is terribly cumbersome, isn't there a better way to solve this? Maybe there is another Maven 3 - plugin that I am unaware of, or some other command-line tool that does the job? I basically just need a simple way to create a Maven repository that contains all artifacts a given artifact depends on (and no more), and also contains all meta-data expected in a remote repository. Any ideas?

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  • WPF Layout algorithm woes - control will resize, but not below some arbitrary value.

    - by Quantumplation
    I'm working on an application for a client, and one of the requirements is the ability to make appointments, and display the current week's appointments in a visual format, much like in Google Calender's or Microsoft Office. I found a great (3 part) article on codeproject, in which he builds a "RangePanel", and composes one for each "period" (for example, the work day.) You can find part 1 here: http://www.codeproject.com/KB/WPF/OutlookWpfCalendarPart1.aspx The code presents, but seems to choose an arbitrary height value overall (440.04), and won't resize below that without clipping. What I mean to say, is that the window/container will resize, but it just cuts off the bottom of the control, instead of recalculating the height of the range panels, and the controls in the range panels representing the appointment. It will resize and recalculate for greater values, but not less. Code-wise, what's happening is that when you resize below that value, first the "MeasureOverride" is called with the correct "new height". However, by the time the "ArrangeOverride" method is called, it's passing the same 440.04 value as the height to arrange to. I need to find a solution/workaround, but any information that you can provide that might direct me for things to look into would also be greatly appreciated ( I understand how frustrating it is to debug code when you don't have the codebase in front of you. :) ) The code for the various Arrange and Measure functions are provided below. The "CalendarView" control has a "CalendarViewContentPresenter", which handles several periods. Then, the periods have a "CalendarPeriodContentPresenter", which handles each "block" of appointments. Finally, the "RangePanel" has it's own implementation. (To be honest, i'm still a bit hazy on how the control works, so if my explanations are a bit hazy, the article I linked probably has a more cogent explanation. :) ) CalendarViewContentPresenter: protected override Size ArrangeOverride(Size finalSize) { int columnCount = this.CalendarView.Periods.Count; Size columnSize = new Size(finalSize.Width / columnCount, finalSize.Height); double elementX = 0; foreach (UIElement element in this.visualChildren) { element.Arrange(new Rect(new Point(elementX, 0), columnSize)); elementX = elementX + columnSize.Width; } return finalSize; } protected override Size MeasureOverride(Size constraint) { this.GenerateVisualChildren(); this.GenerateListViewItemVisuals(); // If it's coming back infinity, just return some value. if (constraint.Width == Double.PositiveInfinity) constraint.Width = 10; if (constraint.Height == Double.PositiveInfinity) constraint.Height = 10; return constraint; } CalendarViewPeriodPersenter: protected override Size ArrangeOverride(Size finalSize) { foreach (UIElement element in this.visualChildren) { element.Arrange(new Rect(new Point(0, 0), finalSize)); } return finalSize; } protected override Size MeasureOverride(Size constraint) { this.GenerateVisualChildren(); return constraint; } RangePanel: protected override Size ArrangeOverride(Size finalSize) { double containerRange = (this.Maximum - this.Minimum); foreach (UIElement element in this.Children) { double begin = (double)element.GetValue(RangePanel.BeginProperty); double end = (double)element.GetValue(RangePanel.EndProperty); double elementRange = end - begin; Size size = new Size(); size.Width = (Orientation == Orientation.Vertical) ? finalSize.Width : elementRange / containerRange * finalSize.Width; size.Height = (Orientation == Orientation.Vertical) ? elementRange / containerRange * finalSize.Height : finalSize.Height; Point location = new Point(); location.X = (Orientation == Orientation.Vertical) ? 0 : (begin - this.Minimum) / containerRange * finalSize.Width; location.Y = (Orientation == Orientation.Vertical) ? (begin - this.Minimum) / containerRange * finalSize.Height : 0; element.Arrange(new Rect(location, size)); } return finalSize; } protected override Size MeasureOverride(Size availableSize) { foreach (UIElement element in this.Children) { element.Measure(availableSize); } // Constrain infinities if (availableSize.Width == double.PositiveInfinity) availableSize.Width = 10; if (availableSize.Height == double.PositiveInfinity) availableSize.Height = 10; return availableSize; }

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  • Named query not known error trying to call a stored proc using Fluent NHibernate

    - by Hamman359
    I'm working on setting up NHibernate for a project and I have a few queries that, due to their complexity, we will be leaving as stored procedures. I'd like to be able to use NHibernate to call the sprocs, but have run into an error I can't figure out. Since I'm using Fluent NHibernate I'm using mixed mode mapping as recommended here. However, when I run the app I get a "Named query not known: AccountsGetSingle" exception and I can't figure out why. I think I might have a problem with my HBM mapping since I'm not very familiar with using them but I'm not sure. My NHibernate configuration code is: private ISessionFactory CreateSessionFactory() { return Fluently.Configure() .Database(MsSqlConfiguration.MsSql2005 .ConnectionString((conn => conn.FromConnectionStringWithKey("CIDB"))) .ShowSql()) .Mappings(m => { m.HbmMappings.AddFromAssemblyOf<Account>(); m.FluentMappings.AddFromAssemblyOf<Account>(); }) .BuildSessionFactory(); } My hbm.xml file is: <?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"> <sql-query name="AccountsGetSingle"> <return alias="Account" class="Core, Account"></return> exec AccountsGetSingle </sql-query> </hibernate-mapping> And the code where I am calling the sproc looks like this: public Account Get() { return _conversation.Session .GetNamedQuery("AccountsGetSingle") .UniqueResult<Account>(); } Any thoughts or ideas would be appreciated. Thanks.

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  • How does one actually use the UIRequiredDeviceCapabilities key?

    - by Andy
    I followed exactly what I thought I understood the steps to be in the iPhone Programming Guide for specifying that my app requires telephony (I opened MyApp-info.plist, added a new key called UIRequiredDeviceCapabilties, set the key type to Dictionary, added a new row with key set to "telephony", type Boolean, value YES), and sent my app off to Apple. Lo and behold, eleven days later, I get a message from Apple that it's been rejected for not using the UIRequiredDeviceCapabilities key. WTF? How are you actually supposed to implement this?

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  • Add onblur event to ASP.Net MVC's Html.TextBox

    - by justSteve
    What's the correct syntax for an HTML helper (in MVC2) to define an onblur handler where the textbox is generated with code like: <%=Html.TextBox( "ChooseOptions.AddCount" + order.ID, (order.Count > 0) ? AddCount.ToString() : "", new { @class = "{number: true} small-input" } ) thx

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  • Applying Test Driven Development to a tightly coupled architecture

    - by Chris D
    Hi all, I've recently been studying TDD, attended a conference and have dabbled in few tests and already I'm 100% sold, I absolutely love it TDD. As a result I've raised this with my seniors and they are prepared to give it a chance, so they have tasked me with coming up with a way to implement TDD in the development of our enterprise product. The problem is our system has evolved since the days of VB6 to .NET and implements alot of legacy technology and some far from best practice development techniques i.e. alot of business logic in the ASP.NET code behind and client script. The largest problem however is how our classes are tightly coupled with database access; properties, methods, constructors - usually has some database access in some form or another. We use an in-house data access code generator tool that creates sqlDataAdapters that gives us all the database access we could ever want, which helps us develop extremely quickly, however, classes in our business layer are very tightly coupled to this data layer - we aren't even close to implementing some form of repository design. This and the issues above have created me all sorts of problems. I have tried to develop some unit tests for some existing classes I've already written but the tests take ALOT longer to run since db access is required, not to mention since we use the MS Enterprise Caching framework I am forced to fake a httpcontext for my tests to run successfully which isn't practical. Also, I can't see how to use TDD to drive the design of any new classes I write since they have to be soo tightly coupled to the database ... help! Because of the architecture of the system it appears I can't implement TDD without some real hack which in my eyes just defeats the aim of TDD and the huge benefits that come with. Does anyone have any suggestions how I could implement TDD with the constraints I'm bound too? or do I need to push the repository design pattern down my seniors throats and tell them we either change our architecture/development methodology or forget about TDD altogether? :) Thanks

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  • SharpFFmpeg dll references

    - by Rodney Burton
    Looking at SharpFFmpeg project (c# interop library for ffmpeg) I noticed it references avcodec.dll and avformat.dll. What I have are libavcodec.dll and libavformat.dll. Are these the same and if not where do the non-lib versions come from?

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