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• Entity Relationships - Can a weak entity take part in a 'one to many' relationship as the 'one'

  - by jonos

  Hi, With the following entity relationship structure I'm struggling to figure out if the relationship between the LOAN and ITEM is valid? The weak entity of Loan uses a partial key of 'loan_dateLeant' and the primary keys from CUSTOMER and ITEM to form its primary key. However LOAN has a 'one to many' relationship with ITEM as a loan can consist of more than one item. But surely this means that if more than one item is loaned, then the loan record will have two item_id values for part of its primary key?

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• How to connect Model through Controller to View using bindings?

  - by Paperflyer

  I have an NSTextField in my view. Its value is bound to an NSNumber *number in my controller. The controller simply calls through to the model (value) to get the appropriate value. // In the controller - (NSNumber *)number { return [NSNumber numberWithFloat:[model value]]; } - (void)setNumber:(NSNumber *)aNumber { [model setValue:[aNumber floatValue]]; } This is fine, only the controller is not notified of model changes and thus, changing the value in the model does not update the NSTextField. The only other option I can think of is to have the model notify the controller and the controller manually update the view through an Outlet. But this circumvents the binding. // In the model, after value change [[NSNotificationCenter defaultCenter] postNotificationName:@"ValueChanged" object:self]; // In the controller, after being notified - (void)updateView:(NSNotification *)aNotification { [myTextField setFloatValue:[model value]]; } Is there a better, binding-aware way to implement this communication?

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• Mapping Ctrl+Arrow for Home/End/PageUp/Down

  - by user67275

  I'm using Windows 7 on Dell New Inspiron 14z Ultrabook. It doesn't have Home/End/PgUp/PgDn keys. Instead I have to use Fn + arrow keys. Can I re-map those to Ctrl + arrows or Alt + arrows or Shift + arrows? That way I could go one page up and down with only my right hands rather than with the left hand on the Fn key and right hand on arrow key. Also, volume up and down is assigned to FnF11 and FnF12. Can I re-map them to F11 and F12? Existing functions assigned to F11 and F12 will be replaced by FnF11 and FnF12. Is it possible?

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• Changing keys in a "for ( keys %hash ) {}"-loop

  - by sid_com

  Hello! I remember something about not changing the keys in a for my $key ( keys %hash ) { ... for example for my $key ( keys %hash ) { $key = "$key_x"; } But deleting keys and changing values would be fine. Are my memories OK?

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• WPF Binding Failure performance hit vs Exception

  - by Aran Mulholland

  when we bind to heterogeneous collection of objects, not all objects have the same set of properties. in the output window we get a message like: System.Windows.Data Error: 39 : BindingExpression path error: 'RoundingFactor' property not found on 'object' ''MultiLineTextMarkingScheme' (HashCode=7262386)'. BindingExpression:Path=RoundingFactor;.......... This doesn't appear to be an exception, but we are concerned it has a performance impact. Should we be concerned and create a view model that has all the properties we wish to bind to (and have the properties that dont exist on the underlying element return null) or can we just leave it. This situation often occurs in a grid scenario where there might be large numbers of these binding failures.

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• MVC2 Binding isn't working for Html.DropDownListFor<>

  - by devlife

  I'm trying to use the Html.DropDownListFor< HtmlHelper and am having a little trouble binding on post. The HTML renders properly but I never get a "selected" value when submitting. <%= Html.DropDownListFor( m => m.TimeZones, Model.TimeZones, new { @class = "SecureDropDown", name = "SelectedTimeZone" } ) %> [Bind(Exclude = "TimeZones")] public class SettingsViewModel : ProfileBaseModel { public IEnumerable TimeZones { get; set; } public string TimeZone { get; set; } public SettingsViewModel() { TimeZones = GetTimeZones(); TimeZone = string.Empty; } private static IEnumerable GetTimeZones() { var timeZones = TimeZoneInfo.GetSystemTimeZones().ToList(); return timeZones.Select( t = new SelectListItem { Text = t.DisplayName, Value = t.Id } ); } } I've tried a few different things and am sure I am doing something stupid... just not sure what it is :)

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• How to Avoid Duplicate Key Exception

  - by LifeH2O

  I am using TableAdapter to insert records in table within a loop. foreach(....) { .... .... teamsTableAdapter.Insert(_teamid, _teamname); .... } Where TeamID is the primary key in the table After first run of this loop, Insert throws Duplicate Primary Key found Exception. To handle this, i have done this foreach(....) { .... .... try { _teamsTableAdapter.Insert(_teamid, _teamname); } catch (System.Data.SqlClient.SqlException e) { if (e.Number != 2627) MessageBox.Show(e.Message); } .... .... } But using try catch statement is costly, how to avoid this exception. I am working in VS2010 and INSERT ... ON DUPLICATE KEY UPDATE does not work.

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• Django Forms, Foreign Key and Initial retuen all associated values

  - by gramware

  I a working with Django forms. The issue I have is that Foreign Key fields and those using initial take all associated entries (all records associated with that record other then the one entry i wanted e.g instead of getting a primary key, i get the primary key, post subject, post body and all other values attributed with that record). The form and the other associated queries still work well, but this behaviour is clogging my database. How do i get the specific field i want instead of all records. An example of my models is here: A form field for childParentId returns postID, postSubject and postBody instead of postID alone. Also form = ForumCommentForm(initial = {'postSubject':forum.objects.get(postID = postID), }) returns all records related to postID. class forum(models.Model): postID = models.AutoField(primary_key=True) postSubject = models.CharField(max_length=25) postBody = models.TextField() postPoster = models.ForeignKey(UserProfile) postDate = models.DateTimeField(auto_now_add=True) child = models.BooleanField() childParentId = models.ForeignKey('self',blank=True, null=True) deleted = models.BooleanField() def __unicode__(self): return u'%s %s %s %s %s' % (self.postSubject, self.postBody, self.postPoster, self.postDate, self.postID

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• Django Forms, Foreign Key and Initial return all associated values

  - by gramware

  I a working with Django forms. The issue I have is that Foreign Key fields and those using initial take all associated entries (all records associated with that record other then the one entry i wanted e.g instead of getting a primary key, i get the primary key, post subject, post body and all other values attributed with that record). The form and the other associated queries still work well, but this behaviour is clogging my database. How do i get the specific field i want instead of all records. An example of my models is here: A form field for childParentId returns postID, postSubject and postBody instead of postID alone. Also form = ForumCommentForm(initial = {'postSubject':forum.objects.get(postID = postID), }) returns all records related to postID. class forum(models.Model): postID = models.AutoField(primary_key=True) postSubject = models.CharField(max_length=25) postBody = models.TextField() postPoster = models.ForeignKey(UserProfile) postDate = models.DateTimeField(auto_now_add=True) child = models.BooleanField() childParentId = models.ForeignKey('self',blank=True, null=True) deleted = models.BooleanField() def __unicode__(self): return u'%s %s %s %s %s' % (self.postSubject, self.postBody, self.postPoster, self.postDate, self.postID

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• How to Redirect Visual Studio F12 Shortcut Key to Object Browser in C# Project

  - by AMissico

  For C# projects, I would like to have the F12 "Go to Definition" shortcut key to open the Object Browser and select the type under the cursor position. This is the behavior for VB.NET projects, which I really like. I think the Object Browser is more helpful than IntelliSense in some cases. I really do not need a text representation of the metadata. How do I duplicate the F12 / "Go to Definition" functionality in a C# project? Is there a different shortcut key for C#? I am not talking about the Alt+Ctrl+J shortcut key that displays the Object Browser.

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• Having trouble with binding

  - by Tam

  I'm not sure if I'm misunderstanding the binding in Flex. I'm using Cairngorm framework. I have the following component with code like: [Bindable] var _model:LalModelLocator = LalModelLocator.getInstance(); .... <s:DataGroup dataProvider="{_model.friendsSearchResults}" includeIn="find" itemRenderer="com.lal.renderers.SingleFriendDisplayRenderer"> <s:layout> <s:TileLayout orientation="columns" requestedColumnCount="2" /> </s:layout> </s:DataGroup> in the model locator: [Bindable] public var friendsSearchResults:ArrayCollection = new ArrayCollection(); Inside the item renderer there is a button that calls a command and inside the command results there is a line like this: model.friendsSearchResults = friendsSearchResults; Putting break points and stepping through the code I confirmed that this like gets called and the friendsSearchResults gets updated. To my understanding if I update a bindable variable it should automatically re-render the s:DataGroup which has a dataProvider of that variable.

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• deleting registry key, using Visual Studio 2008 setup and deployment project in windows 7

  - by Isuru

  I have created a setup and deployment project in Visual Studio 2008 Professional. I'm using Visual C++, and in it I have two exe files which run under custom actions. One is running in commit and other in uninstall. Purpose is to add a registry key at install time and remove it at uninstall. It works perfectly on Windows XP but when I change to Windows 7 and run the setup, only the key-adding part works. The key doesn't get deleted at uninstall. But when I take the uninstall exe file out from the setup and run it separately on Windows 7, (not through the setup, by just double-clicking on the exe) it removes the registry entry perfectly. Any idea what the problem is?

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• deleting registry key, using visual stusdio 2008 setup and deployment project in windows 7

  - by Isuru

  Hi, I have created a setup and deployment project in visual studio 2008 pro. using visual C++, and in it I have two exe files which run under custom actions. One is running in commit and other in uninstall. Purpose is to add a registry key at install time and remove it at uninstall. It works perfectly on Windows XP but when I change to Windows 7 and run the setup, only the key-adding part works. The key doesn't get deleted at uninstall. But when I take the uninstall exe file out from the setup and run it separately on Windows 7, (not through the setup, by just double-clicking on the exe) it removes the registry entry perfectly. Any idea what the problem is??? Thanks and Regards.

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• Assign binding path at runtime in WPF DataTemplate

  - by Abiel

  I am writing a WPF program in C# in which I have a ListView for which the columns will be populated at runtime. I would like to use a custom DataTemplate for the GridViewColumn objects in the ListView. In the examples I have seen where the number of columns is fixed in advance, a custom DataTemplate is often created using something like the XAML below. <DataTemplate x:Key="someKey"> <TextBlock Text="{Binding Path=FirstName}" /> </DataTemplate> This DataTemplate could also later be assigned to GridViewColumn.CellTemplate in the code-behind by calling FindResource("someKey"). However, this alone is of no use to me, because in this example the Path element is fixed to FirstName. Really I need something where I can set the Path in code. It is my impression that something along these lines may be possible if XamlReader is used, but I'm not sure how in practice I would do this. Any solutions are greatly appreciated.

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• Override default behavior of SPACE key in .net WinForms ListView

  - by Axarydax

  Hello, I'd like to implement some custom behavior of Space key in a ListView. Basically I'd like to toggle selected status of the item under cursor - that should be fairly simple this.FocusedItem.Selected = !this.FocusedItem.Selected; but alas, it also does the default action, which is to select the focused item. This way I am unable to 'unselect' the focused item. I've looked for similar problems and they suggest using PreviewKeyDown event, in which I would process the key and disallow the ListView to do its default action. But the PreviewKeyDown event argument has no "handled" property, so I cannot 'eat' this key.

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• How do I trap the ENTER key in WM 6.1 using C++

  - by Rob King

  Hi,Our barcode scanner application is written in C++ eMbedded V 4.00 and works well on the Motorola MC50 WM5 where the ENTER key is interpreted as an IDOK. We are moving the app to the MC55 with WM6.1 and the ENTER key does not translate to an IDOK. I'm of the impression we will have to programatically trap the key entry (or the value passed on via DataWedge). I have made several attempts to implement either a HOTKEY or something via an Accelerator Table but have been unable to interpret the Microsoft on-line descriptions. If there is a simpler answer that would be good news. If not, a more specific example than the MS samples would be greatly appreciated. Thanks in advance.

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• hibernate foreign key mapping many-to-one

  - by Lily

  I have been working on it for quite a while, but still can't figure out what's wrong with my code. Each Service has multiple profiles, but each profile only has one Service. Service { Long service_id; // primary key ... getter/setter } Profile { Long profile_id; // primary key Long service_id; // foreign key ... getter and setter } in Profile.hbm.xml. I add < many-to-one name="service_id" class="com.mot.diva.dto.Service" column="SERVICE_ID" cascade="save-update"> < /many-to-one> Is it the correct way to map it?

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• Binding a slider value on the height of its thumb in WPF

  - by sofri

  Hi, I have a databinding problem in WPF. I would like to "customise" a slider in a way that the thumb grows when you move the slider to the right and the thumb shrinks when you move the slider to the left. So I edited the template for the slider and changed the look of the slider so the slider looks like I want it to. But now I have to bind the height of the thumb to the value of the slider but I do not know how that works. I did some simple data binding things but I cannot figure out how I can bind this "thumb height" that's inside of my slider's template to the slider's value that's inside the User Control where my slider is in. So how can I do it?

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• WPF - Binding a color resource to the data object within a DataTemplate

  - by John

  I have a DataTemplate and a SolidColorBrush in the DataTemplate.Resources section. I want to bind the color to a property of the same data object that the DataTemplate itself is bound to. However, this does not work. The brush is ignored. Why? <DataTemplate DataType="{x:Type data:MyData}" x:Name="dtData"> <DataTemplate.Resources> <SolidColorBrush x:Key="bg" Color="{Binding Path=Color, Converter={StaticResource colorConverter}" /> </DataTemplate.Resources> <Border CornerRadius="15" Background="{StaticResource bg}" Margin="0" Opacity="0.5" Focusable="True"> </DataTemplate>

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• CheckBox ListView SelectedValues DependencyProperty Binding

  - by Ristogod

  I am writing a custom control that is a ListView that has a CheckBox on each item in the ListView to indicate that item is Selected. I was able to do so with the following XAML. <ListView x:Class="CheckedListViewSample.CheckBoxListView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:Ignorable="d"> <ListView.Style> <Style TargetType="{x:Type ListView}"> <Setter Property="SelectionMode" Value="Multiple" /> <Style.Resources> <Style TargetType="ListViewItem"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="ListViewItem"> <Border BorderThickness="{TemplateBinding Border.BorderThickness}" Padding="{TemplateBinding Control.Padding}" BorderBrush="{TemplateBinding Border.BorderBrush}" Background="{TemplateBinding Panel.Background}" SnapsToDevicePixels="True"> <CheckBox IsChecked="{Binding IsSelected, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListViewItem}}}"> <CheckBox.Content> <ContentPresenter Content="{TemplateBinding ContentControl.Content}" ContentTemplate="{TemplateBinding ContentControl.ContentTemplate}" HorizontalAlignment="{TemplateBinding Control.HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding Control.VerticalContentAlignment}" SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" /> </CheckBox.Content> </CheckBox> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style> </Style.Resources> </Style> </ListView.Style> </ListView> I however am trying to attempt one more feature. The ListView has a SelectedItems DependencyProperty that returns a collection of the Items that are checked. However, I need to implement a SelectedValues DependencyProperty. I also am implementing a SelectedValuesPath DependencyProperty. By using the SelectedValuesPath, I indicate the path where the values are found for each selected item. So if my items have an ID property, I can specify using the SelectedValuesPath property "ID". The SelectedValues property would then return a collection of ID values. I have this working also using this code in the code-behind: using System.Windows; using System.Windows.Controls; using System.ComponentModel; using System.Collections; using System.Collections.Generic; namespace CheckedListViewSample { /// <summary> /// Interaction logic for CheckBoxListView.xaml /// </summary> public partial class CheckBoxListView : ListView { public static DependencyProperty SelectedValuesPathProperty = DependencyProperty.Register("SelectedValuesPath", typeof(string), typeof(CheckBoxListView), new PropertyMetadata(string.Empty, null)); public static DependencyProperty SelectedValuesProperty = DependencyProperty.Register("SelectedValues", typeof(IList), typeof(CheckBoxListView), new PropertyMetadata(new List<object>(), null)); [Category("Appearance")] [Localizability(LocalizationCategory.NeverLocalize)] [Bindable(true)] public string SelectedValuesPath { get { return ((string)(base.GetValue(CheckBoxListView.SelectedValuesPathProperty))); } set { base.SetValue(CheckBoxListView.SelectedValuesPathProperty, value); } } [Bindable(true)] [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] [Category("Appearance")] public IList SelectedValues { get { return ((IList)(base.GetValue(CheckBoxListView.SelectedValuesPathProperty))); } set { base.SetValue(CheckBoxListView.SelectedValuesPathProperty, value); } } public CheckBoxListView() : base() { InitializeComponent(); base.SelectionChanged += new SelectionChangedEventHandler(CheckBoxListView_SelectionChanged); } private void CheckBoxListView_SelectionChanged(object sender, SelectionChangedEventArgs e) { List<object> values = new List<object>(); foreach (var item in SelectedItems) { if (string.IsNullOrWhiteSpace(SelectedValuesPath)) { values.Add(item); } else { try { values.Add(item.GetType().GetProperty(SelectedValuesPath).GetValue(item, null)); } catch { } } } base.SetValue(CheckBoxListView.SelectedValuesProperty, values); e.Handled = true; } } } My problem is that my binding only works one way right now. I'm having trouble trying to figure out how to implement my SelectedValues DependencyProperty so that I could Bind a Collection of values to it, and when the control is loaded, the CheckBoxes are checked with items that have values that correspond to the SelectedValues. I've considered using the PropertyChangedCallBack event, but can't quite figure out how I could write that to achieve my goal. I'm also unsure of how I find the correct ListViewItem to set it as Selected. And lastly, if I can find the ListViewItem and set it to be Selected, won't that fire my SelectionChanged event each time I set a ListViewItem to be Selected?

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• How to capture any key in X?

  - by cz-david

  Hi, I am building an application for which I need to periodically get information about users keyboard. It is going to be user idle detection application. I have a fairly simple solution to periodically check if the mouse has been moved. But I can't figure any reasonable non root way to detect if the keyboard has been pressed. I was thinking about registering a hook every timer timeout and on any key press to unregister it. So if there is no key press for a long time then my program will know if the user is idle. Anyway, I couldn't find any global hooks for any key, including modifiers. Is there an easy way to do this? Or would someone have a better way to detect keyboard idleness? Thanks, David Polák

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• How to update primary key

  - by slave016

  Here is my problem: I have 2 tables: 1.WORKER, with coloumns |ID|OTHER_STAF| , where ID is primary key, and 2.FIRM, with coloumns |FPK|ID|SOMETHING_ELSE| , where combination FPK and ID make primary key, and also ID is a foreign key referenced to WORKER.ID (not null, and must have same value as in WORKER). I want to make stored procedure UPDATE_ID_WORKER, where I would like to change the value of specific ID in WORKER, and also in all instances of specific value of ID in FIRM. stored procedure: ........ @id .. ???? ........ Thanks for every advice...

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• .NET Framework 3.5, Assembly Binding Logging

  - by Achilles

  I am getting the following error: Could not load file or assembly 'System.Web.DynamicData, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. I've researched the problem and some of the solutions are pointing to Turning on Assembly Binding Logging. I'm confused as to what this error is. So my question: *What does this error mean and how do I resolve it? I am not hosting the site in a shared hosting scenario, it is on a single server running .NET Framework 3.5.0 using IIS 6.0 Edit .Net Framework 3.5 SP 1 isn't installed on the server. The missing assemblies are apart of that Service Pack.

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• Getting the Action during model binding

  - by Kieron

  Hi, Is there a way of getting the Action, and reading any attributes, during the model binding phase? The scenario is this: I've got a default model binder set-up for a certain data-type, but depending on how it's being used (which is controlled via an attribute on the action) I need to ignore a set of data. I can use the RouteData on the controller context and see the action name, which I can use to go get the data, but wondered if that information is already available. Additionally, if the action in question is an asynchronous one, they'd be more processing involved in looking it up...

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• ASP.NET Binding integer to CheckBox's Checked field

  - by Sung Meister

  I have a following ListView item template, in which I am trying to bind integer value to Checked property of CheckBox. IsUploaded value contains only 0 and 1... <asp:ListView ID="trustListView" runat="server"> <ItemTemplate> <asp:CheckBox ID="isUploadedCheckBox" runat="server" Checked='<%# Bind("IsUploaded") %>' /> </ItemTemplate> </asp:ListView> But ASP.NET complains that Exception Details: System.InvalidCastException: Sepcified cast is not valid Even though following code using DataBinder.Eval() works, I need to have a 2-way binding, thus need to use Bind(). <asp:CheckBox ID="isUploadedCheckBox2" runat="server" Checked='<%# Convert.ToBoolean( DataBinder.Eval(Container.DataItem, "IsUploaded"))) %>' /> How can I convert 0's and 1's to boolean using Bind()? [ANSWER] I have extended auto-generated type through partial class by adding a new property mentioned in the answer by Justin

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