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  • progressbar to be updated on selected index changed of a combo box

    - by joy
    hi, i am developing a windows application using C#.net and i am having a combobox with some list items .on selected index changed event of the combo box i need to have the progess bar to be visible and should disappear after retrieving some data. i am trying inthe way: for (int i = progressBar1.Minimum; i <= progressBar1.Maximum; i++) { progressBar1.PerformStep(); } panel1.Visible = false; where my progress bar is placed in panel1. but i am getting the progess bar when i first run my application after that when ever combobox item is changed the progress abr is not visible. i need the solution asap... Thanks in advance!

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  • WPF MVVM: How do ViewModels communicate with each other?

    - by Dev1
    I have a View which has 2 sub views on it and a ViewModel is assigned to each view: ViewA - ViewModelA { ViewB - ViewModelB ViewC - ViewModelC } ViewB has a text box and ViewC has a combobox, both of which i need access from ViewModelA. Not the GUI control itself, but the bound value i.e. .Text of the textbox and .SelectedItem of the ComboBox. Currently i just have ViewModelB and ViewModelC as properties on ViewModelA but it feels wrong. What's the standard way for view models to communicate with each other without breaking the MVVM pattern? I'm completely new to WPF/MVVM.

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  • Passing parameters in VBA for Access

    - by Newbie
    In Access 2007 I have created a form with a textbox and a button. At the moment, when I press the button, I load a query with the textbox data passed as a parameter to the query criteria. I would like to change this so that all (manually input) options appear in a combobox (in place of the textbox). I would then like to pass the combobox text to a VBA module upon pressing the button. How do I do this? Similarly, I hope to output a different string from this module, and I hope to use this as the query criteria. How do I do this?

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  • Facncybox in Jquery

    - by user319740
    I am using jquery.fancybox-1.2.1.js of fancy box in asp.net application Q1: In the base page i have datagrid and on combobox. on slection of combobox the datagrid is populated. From the datagrid I open the fancybox when user click on Edit link. I open new page like In EditProjectTask.aspx i have the controls in edible mode. Now if user closes the window using default icon provided in fancybox. then if user select some other option from combox the url changes into EditProjectTask?Task= 86 Q2: # From the # datagrid I open the fancybox when user click on Edit link. I open new page like In EditProjectTask.aspx i have the controls in edible mode. Now when user updates the the content I want to close the fancybox and also refresh the parent window. I have achieved this using After update i # But it reloads all the page. Can I use some Ajax call.

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  • Using different validation rules based on user input.

    - by chiefanov
    I have a simple form: a combobox and a textbox. My combobox has 2 values: A and B. When value A is selected I want textbox to use a validation rule. When value B is selected there should be no validation rules applied to the textbox. I've read an article that has a solution and I'm trying to use it, but had no luck so far, and I think there might be a more elegant solution. Has anyone done anything like this before? Any ideas are highly appreciated.

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  • VB.net Dataset display different column

    - by Josh
    Hello, I am sure this has to a comon thing I just can't find it. I am making a combobox from my data source. Basically, This is a projects form and the user needs to select the the primary contact which is contrained by the customer id (GETbyCustomerID) set in another field. I have it working... mostly except the combobox only displays the contact ID which is completely useless to the user. I need to know how to display the First and Last name (both are seperate columns in the table). Any help? I am just using the designer.

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  • Query MS Access database in VB 2008

    - by Logan
    Hi, I added an Access database as a Data Source in VB 2008. I want to query this database and use the information in various ways throughout the program. For example, there is an Employee table with first/last names of employees. I have a combobox on my form that I want to display all of the employees. So I want to query the database for all the rows in the Employee table, and add them to the combobox as I go. I am familiar with SQL Syntax, so I am not asking how to write the query itself, but rather how to fetch rows in VB code (mimicking php's mysql_fetch_assoc and mysql_connect essentially) Thanks! Edit: Also, I want to know if I can query a DB if I don't add it as a data source (if I know the path name of the database)

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  • C# Preprocessor Directives

    - by MarkPearl
    Going back to my old c++ days at university where we had all our code littered with preprocessor directives - I thought it made the code ugly and could never understand why it was useful. Today though I found a use in my C# application. The scenario – I had made various security levels in my application and tied my XAML to the levels by set by static accessors in code. An example of my XAML code for a Combobox to be enabled would be as follows… <ComboBox IsEnabled="{x:Static security:Security.SecurityCanEditDebtor}" />   And then I would have a static method like this… public static bool SecurityCanEditDebtorPostalAddress { get { if (SecurityCanEditDebtorPostalAddress) { return true; } else { return false; } } } My only problem was that my XAML did not like the if statement – which meant that while my code worked during runtime, during design time in VS2010 it gave some horrible error like… NullReferenceException was thrown on “StatiucExtension”: Exception has been thrown by the target of an invocation… If however my C# method was changed to something like this… public static bool SecurityCanEditDebtorPostalAddress { get { return true; } }   My XAML viewer would be happy. But of course this would bypass my security… <Drum Roll> Welcome preprocessor directives… what I wanted was during my design experience to totally remove the “if” code so that my accessor would return true and not have any if statements, but when I release my project to the big open world, I want the code to have the is statement. With a bit of searching I found the relevant MSDN sample and my code now looks like this… public static bool SecurityCanEditDebtorPostalAddress { get { #if DEBUG return true; #else if (Settings.GetInstance().CurrentUser.SecurityCanEditDebtorPostalAddress) { return true; } else { return false; } #endif } }   Not the prettiest beast, but it works. Basically what is being said here is that during my debug mode compile my code with just the code between the #if … #else block, but what I can now do is if I want to universally switch everything to the “if else” statement, I just go to my project properties –> Build and change the “Debug” flag as illustrated in the picture below. Also note that you can define your own conditional compilation symbols, and if you even wanted to you could skip the whole properties page and define them in code using the #define & #undef directives. So while I don’t like the way the code works and would like to look more into AOP and compare it to this method, it works for now.

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  • Databinding to ObservableCollection in a different UserControl - how to preserve current selections?

    - by Dave
    Scope of question expanded on 2010-03-25 I ended up figuring out my problem, but here's a new problem that came up as a result of solving the original question, because I want to be able to award the bounty to someone!!! Once I figured out my problem, I soon found out that when the ObservableCollection updates, the databound ComboBox has its contents repopulated, but most of the selections have been blanked out. I assume that in this case, MVVM is going to make it difficult for me to remember the last selected item. I have an idea, but it seems a little nasty. I'll award the bounty to whomever comes up with a nice solution for this! Question re-written on 2010-03-24 I have two UserControls, where one is a dialog that has a TabControl, and the other is one that appears within said TabControl. I'll just call them CandyDialog and CandyNameViewer for simplicity's sake. There's also a data management class called Tracker that manages information storage, which for all intents and purposes just exposes a public property that is an ObservableCollection. I display the CandyNameViewer in CandyDialog via code behind, like this: private void CandyDialog_Loaded( object sender, RoutedEventArgs e) { _candyviewer = new CandyViewer(); _candyviewer.DataContext = _tracker; candy_tab.Content = _candyviewer; } The CandyViewer's XAML looks like this (edited for kaxaml): <Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Page.Resources> <DataTemplate x:Key="CandyItemTemplate"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="120"></ColumnDefinition> <ColumnDefinition Width="150"></ColumnDefinition> </Grid.ColumnDefinitions> <TextBox Grid.Column="0" Text="{Binding CandyName}" Margin="3"></TextBox> <!-- just binding to DataContext ends up using InventoryItem as parent, so we need to get to the UserControl --> <ComboBox Grid.Column="1" SelectedItem="{Binding SelectedCandy, Mode=TwoWay}" ItemsSource="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.CandyNames}" Margin="3"></ComboBox> </Grid> </DataTemplate> </Page.Resources> <Grid> <ListBox DockPanel.Dock="Top" ItemsSource="{Binding CandyBoxContents, Mode=TwoWay}" ItemTemplate="{StaticResource CandyItemTemplate}" /> </Grid> </Page> Now everything works fine when the controls are loaded. As long as CandyNames is populated first, and then the consumer UserControl is displayed, all of the names are there. I obviously don't get any errors in the Output Window or anything like that. The issue I have is that when the ObservableCollection is modified from the model, those changes are not reflected in the consumer UserControl! I've never had this problem before; all of my previous uses of ObservableCollection updated fine, although in those cases I wasn't databinding across assemblies. Although I am currently only adding and removing candy names to/from the ObservableCollection, at a later date I will likely also allow renaming from the model side. Is there something I did wrong? Is there a good way to actually debug this? Reed Copsey indicates here that inter-UserControl databinding is possible. Unfortunately, my favorite Bea Stollnitz article on WPF databinding debugging doesn't suggest anything that I could use for this particular problem.

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  • Jquery / PhP / Joomla Select one of two comboboxes does not get updated

    - by bluesbrother
    I am making a Joomla component wich has 3 comboboxes/selects on the page. One with languages and 2 with subjects. If you change the language the other two get filled with the same data (the subjects in the selected language) the name of the selectbox are different but otherwise the same. I get an error for one of the subject boxes (hence the url gets red), but there is no logic in wich one will give an error. In Firebug i get the HTML back for the one without the other and this one gets updated but the other one gives nothing back. If i right click in firebug on the one that gave the error, and do "send again" it will load fine. Is their a timing problem? The change event of the language selectbox: jQuery('#cmbldcoi_ldlink_language').bind('change', function() { var cmbLangID = jQuery('#cmbldcoi_ldlink_language').val(); if (cmbLangID !=0) { getSubjectCmb_lang(cmbLangID, 'cmbldcoi_ldlink_subjects', '#ldlinksubjects'); } }); Function that requests the php file to create the html for the select: function getSubjectCmb_lang(langID, cmbName, DivWhereIn) { var xdate = new Date().getTime(); var url = 'index.php?option=com_ldadmin&view=ldadmin&format=raw&task=getcmbsubj_lang&langid=' + langID + '&cmbname=' + cmbName + '&'+ xdate; jQuery(DivWhereIn).load(url, function(){ }); } And in the php file there is a connection made to the database to ge the information to build the selectbox. I use a function for this that is okay because it makes al my selectboxes. The only place where there are problems with select boxes is on the pages that has 2 selects that need to change when a third one changed. My guess it is somewhere in the Jquery where this goes wrong. And i think it has to do with timing. But i am open for all sugestions. Thanx. UPDATE: No the ID and Name fields are different. They are named : cmbldcoi_child cmbldcoi_parent Here is my code: The change event for the first combobox which makes the other two change: jQuery('#cmbldcoi_language_chain_subj').bind('change', function(){ var langID = jQuery('#cmbldcoi_language_chain_subj').val(); if (langID != 0){ getSubjectCmb_lang(langID, 'cmbldcoi_child', '#div_cmbldcoi_child'); getSubjectCmb_lang(langID, 'cmbldcoi_parent', '#div_cmbldcoi_parent'); } }); } The function wicht calls the php file to get the info from the database: function getSubjectCmb_lang(langID, cmbName, DivWhereIn){ var xdate = new Date().getTime(); var url = 'index.php?option=com_ldadmin&view=ldadmin&format=raw&task=getcmbsubj_lang&langid=' + langID + '&cmbname=' + cmbName + '&'+ xdate; jQuery(DivWhereIn).load(url, function(){ }); } The PHP code function getcmbsubj_lang(){ $langid = JRequest::getVar('langid'); if ($langid > 0 ){ $langid = JRequest::getVar('langid'); }else{ $langid = 1; } $cmbName = JRequest::getVar('cmbname'); //$lang_sufx = self::get_#__sufx($langid); print ld_html::ld_create_cmb_html($cmbName, '#__ldcoi_subjects','id', 'subject_name', " WHERE id_language={$langid} ORDER BY subject_name" ); } There is a class wich is called ld_html wich has an funnction in it that creates a combobox. ld_html::ld_create_cmb_html() It gets an table name, id field, namefield and optional an where clause. It all works fine if there is just one combobox thats needs updating. It give a problem when there are two. Thanks for the help !

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  • Silverlight Cream for May 13, 2010 -- #861

    - by Dave Campbell
    In this Issue: Sigurd Snørteland, Jeff Prosise, DaveDev, Joe Zhou, Chris Eargle, John Papa(-2-, -3-), and David Anson(-2-). Shoutouts: In with the links I've listed below, Sigurd Snørteland also sent a link to this app he's working on which is actually pretty cool to see: ZuneLight. The code is not yet available. He also has a no-code demo of a Silverlight Media Center Pieter Voloshyn, Luiz Thadeu, and Jhun Iti have a very nice Silverlight image editor up: Thumba From SilverlightCream.com: WP7 - Silverlight on mobile Sigurd Snørteland submitted some links for me that have been translated to English from his blog. I hope the pages come out good because he's got a lot of good stuff on there. This one has a link to a presentation he did, and 4 projects you can load up in the emulator that he's converted to the phone: weather, worldclock, coverflow, and solitaire ... pretty cool... thanks for the links Sigurd! Understanding Page Orientation in Silverlight for Windows Phone Jeff Prosise has a really nice post up on page orientation in WP7 ... what it means to your app, how to detect it, and example code for what to do then... also love a quote by Jeff: "Silverlight for Windows Phone is the hottest thing since color TV" Why you should check out Expression Blend Behaviors when using Silverlight DaveDev has a post up describing Behaviors and why we should use them, plus tons of external links to resources, blogs, videos... all good stuff... Fiddler inspector for WCF Silverlight Polling Duplex and WCF RIA Joe Zhou announces and provides a link to a new Fiddler inspector that understands the framing in Polling Duplex and also raw binary xml and binary SOAP. Windows Phone Controls v0.7 Chris Eargle reports the release of Version 0.7 of the Windows Phone Controls project on CodePlex ... this includes a Pivot Control and a Panorama Control... both very nicely done. Binding to Silverlight ComboBox and Using SelectedValue, SelectedValuePath and DisplayMemberPath John Papa responds to a user question and put up a nice post about binding to a ComboBox and then go from the selected item to some other property ... code included No More Boxes! Exploring the PathListBox (Silverlight TV #25) Silverlight TV 25 went up on Tuesday ... thought it was going to be Thursday?? anyway ... John Papa and Adam Kinney are discussing the PathListBox and looking at some cool demos thereof. Exposing SOAP, OData, and JSON Endpoints for RIA Services (Silverlight TV 26) Since today IS Thursday, we have a new Silverlight TV, number 26, and John Papa is chatting with Deepesh Mohnani of the WCF RIA Services team about exposing all sorts of endpoints... should be something in there for everybody :) Workaround for a Silverlight data binding bug affecting various scenarios - including DataGrid+ContextMenu David Anson details the rabbit-trail he and others on the team followed in response to a problem reported via Twitter where the binding on a DataGrid seemed off by a row(!) ... weird but true, validated, and SL3/4 are bug-for-bug compatible with this too! ... But David wouldn't leave us there.. he also has a workaround. Sharing the code for a simple Silverlight 4 REST-based cloud-oriented file management app for Azure and S3 David Anson had an opportunity to build an app he's wanted to build for a while and shares it with us: Blobstore -- a small, lightweight Silverlight 4 application that acts as a basic front-end for the Windows Azure Simple Data Storage and the Amazon Simple Storage Service (S3) -- and remember I said he shared the source :) Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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  • Silverlight Cream for January 04, 2011 -- #1022

    - by Dave Campbell
    In this Issue: Dennis Doomen, Doug Holland, Kunal Chowdhury, Sacha Barber, Paul Sheriff, Mike Snow(-2-), Peter Kuhn(-2-), and Mike Ormond. Above the Fold: Silverlight: "Silverlight: Fixing the BookShelf Sample" Peter Kuhn WP7: "Searching the Windows Phone 7 Marketplace Programmatically" Doug Holland Prism/Cinch: "PRISM 4 Custom Transitioning Region" Sacha Barber Shoutouts: Sacha Barber the author of Cinch asks for some advice from users: Cinch V2 : Question For The Reader Michael Crump introduces us to SnippetManager as a way to organize your Silverlight snippets... I'm thinking any snippet: A better way to organize your Silverlight Code Snippets. Andy Beaulieu announced an update of Physics Helper 4.2 using Farseer 3.2 ... check out the breaking changes though! Dennis Doomen blogged about a new release of his Fluent Assertions: A new year with a new release of Fluent Assertions, with a blog post about it below From SilverlightCream.com: Verifying PropertyChanged events in Silverlight using Fluent Assertions Dennis Doomen release his latest Fluent Assertions for .NET and Silverlight and wrote up a big post about the new event monitoring syntax. Searching the Windows Phone 7 Marketplace Programmatically Doug Holland has a post up on MSDN blogs talking about searching the WP7 Marketplace programmatically... ya know you should be able to do it... here's how. Beginners Guide to Visual Studio LightSwitch (Part - 5) Kunal Chowdhury has Part 5 of a tutorial series on Lightswitch up at SilverlightShow... working with custom validation this time, and for the first time in this series so far actually writes some code! PRISM 4 Custom Transitioning Region Sacha Barber took time to look at Prism4/MEF and Cinch2 and found things to be fine then wrote a custom PRISM region adaptor that uses a TransitionalElement from the Microsoft Transitionals project... code available, blog post to come. Get Application Title from Windows Phone Paul Sheriff has a cool chunk of code up... getting the Application's title programmatically... and other attributes as well, if you were wondering why you might wanna do that. Detecting Users Win7 Mobile Theme Color Mike Snow has a couple as well... first up is how to detect your user's theme... obviously useful if you wanna match it. Selecting an Item in a ComboBox after Adding Items Second for Mike Snow is a general Silverlight issue... setting the selected item on a ComboBox after filling it... if you haven't stumbled across this yet, you will... A Simplified Grid Markup Reloaded Peter Kuhn has a pair of posts up since last time... this first is an extension of Colin Eberhardt's simplified Grid markup system, but it's only useful if you don't plan on using Blend... can we get a show of hands? :) Silverlight: Fixing the BookShelf Sample Next Peter Kuhn has some changes to the Bookshelf code, but more importantly has some excelling tips about shader effects, Effects on Visual Elements and how to make best use of all the above. Displaying HTML Content in Windows Phone 7 Mike Ormond has a WP7 post up describing problems a customer had early on displaying rich text and an attempt to use the WebBrowser control to pull it off and the problems that caused... check out the resultant code, and read the comments as well. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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  • WPF ObservableCollection CollectionView.CurrentChanged not firing.

    - by EL
    Hi folks, I have a problem with one of my ICollectionViews. The ICollectionView's CurrentChanged event i not firing. Please see my code below. XAML: <!-- Publication --> <TextBlock Name="tbkPublication" Text="{x:Static abConst:Print.tbkPublicationText}" Grid.Row="0" Grid.Column="0" Margin="3" ></TextBlock> <ComboBox Grid.Column="1" Grid.Row="0" Margin="3" Name="cmbPublication" BorderThickness="1" ItemsSource="{Binding Path=EnterpriseList}" DisplayMemberPath="Name" SelectedValuePath="Value" SelectedIndex="0" IsSynchronizedWithCurrentItem="True" /> <!-- Distribution Area Region --> <TextBlock Name="tbkDistributionArea" Text="{x:Static abConst:Print.tbkDistributionAreaText}" Grid.Row="1" Grid.Column="0" Margin="3" ></TextBlock> <ComboBox Grid.Column="1" Grid.Row="1" Margin="3" Name="cmbDistributionArea" BorderThickness="1" ItemsSource="{Binding Path=ZonesList}" DisplayMemberPath="Name" SelectedValuePath="Value" SelectedIndex="0" IsSynchronizedWithCurrentItem="True" /> AND C# (ViewModel) #region Properties public ObservableCollection<GenericNameValuePair<int, string>> EnterpriseList { get { return _abEnterpriseList; } set { _abEnterpriseList = value; } } public ObservableCollection<GenericNameValuePair<int, string>> ZonesList { get { return _abZonesList; } set { _abZonesList = value; } } #endregion private void InitCollections() { _collectionViewEnterprise = CollectionViewSource.GetDefaultView(EnterpriseList); _collectionViewZone = CollectionViewSource.GetDefaultView(ZonesList); //Replace if(_collectionViewEnterprise == null) throw new NullReferenceException("Enterprise collectionView is null."); if (_collectionViewZone == null) throw new NullReferenceException("Zone collectionView is null."); _collectionViewEnterprise.CurrentChanged += new EventHandler(OnCollectionViewEnterpriseCurrentChanged); _collectionViewZone.CurrentChanged += new EventHandler(OnCollectionViewZoneCurrentChanged); } Please help. Thanks in advance.

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  • XAML | When used XamlReader.Parse, not able to refer the items using the LogicalTreeHelper/VisualTre

    - by Roopesh
    Hi, I am setting the dynamic xaml (I am reading the xaml from the DB) for the content of a tab using the below statement. Tab.Content = XamlReader.Parse(xaml, ctx) After setting the content, if I try getting the children using the VisualTreeHelper, but I am not able to get. How ever I dont have this issue when I construct the xaml statically. Here is the code to reading the xaml. Dim XmlDocument = New XmlDataDocument() Dim IID As String = Nothing Dim xaml As String = Nothing Dim Tab As New TabItem Dim TempPanel As XmlNode = Nothing 'Tab.Height = 0 Try XmlDocument.Load(Directory.GetCurrentDirectory & "\Xml\AppFile.xml") pXmlDoc = XmlDocument xaml = XmlDocument.SelectSingleNode("//Grid").OuterXml Dim AsmName As String = System.Reflection.Assembly.GetExecutingAssembly().GetName().Name Dim ctx As ParserContext = New ParserContext() ' New ParserContext() ctx.XamlTypeMapper = New XamlTypeMapper(New String() {AsmName}) ctx.XamlTypeMapper.AddMappingProcessingInstruction("src", "WpfToolkitDataGridTester", AsmName) ctx.XmlnsDictionary.Add("", "http://schemas.microsoft.com/winfx/2006/xaml/presentation") ctx.XmlnsDictionary.Add("x", "http://schemas.microsoft.com/winfx/2006/xaml") ctx.XmlnsDictionary.Add("src", "clr-namespace:WpfToolkitDataGridTester;assembly=" + AsmName) Tab.Name = "Tab" & Grid1Tab.Items.Count + 1 Tab.Header = "AppFile-1" Tab.BorderThickness = New Thickness(0) Tab.IsSelected = True Tab.Content = XamlReader.Parse(xaml, ctx) Grid1Tab.Items.Add(Tab) Return True Catch ex As Exception Throw End Try Here is the code to access the item after constructing the XAML. For i As Integer = 0 To VisualTreeHelper.GetChildrenCount(myVisual) - 1 Dim childVisual As Visual = CType(VisualTreeHelper.GetChild(myVisual, i), Visual) Select Case childVisual.DependencyObjectType.Name Case "ComboBox" AddHandler CType(childVisual, ComboBox).SelectionChanged, AddressOf ComboBox_SelectChanged Case "CheckBox" AddHandler CType(childVisual, CheckBox).Checked, AddressOf CheckBoxClicked AddHandler CType(childVisual, CheckBox).Unchecked, AddressOf CheckBoxClicked Case "RadioButton" AddHandler CType(childVisual, RadioButton).Checked, AddressOf CheckBoxClicked Case "TabControl" For Each item As System.Windows.Controls.TabItem In CType(childVisual, TabControl).Items EnumVisual(item.Content) Next End Select EnumVisual(childVisual) Next i any help is highly appreciated. Thanks,

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  • Databinding between UserControls?

    - by Dave
    I've got a situation where one of my UserControls would like to display a list of strings in a droplist, and the ItemsSource is set to another UserControl's ObservableCollection. The consumer of this data has its droplist defined in XAML like this: <ComboBox Grid.Column="1" SelectedItem="{Binding MyItem, Mode=TwoWay}" ItemsSource="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.MyItems}" Margin="3"></ComboBox> MyItems is defined as an ObservableCollection<string> in the producer UserControl. Now everything works fine when the controls are loaded. As long as MyItems is populated first, and then the consumer UserControl is displayed, all of the items are there. I obviously don't get any errors in the Output Window or anything like that. The issue I have is that when the ObservableCollection is modified, those changes are not reflected in the consumer UserControl! I've never had this problem before, but all of my previous uses of ObservableCollection with updating the collection are within a single control, and databinding is not inter-UserControl. Is there something I did wrong? Is there a good way to actually debug this? Reed Copsey indicates here that inter-UserControl databinding is possible. Unfortunately, my favorite Bea Stollnitz article on WPF databinding debugging doesn't suggest anything that I could use for this particular problem.

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  • Understanding ItemsSource and DataContext in a DataGrid

    - by Ben McCormack
    I'm trying to understand how the ItemsSource and DataContext properties work in a Silverlight Toolkit DataGrid. I'm currently working with dummy data and trying to get the data in the DataGrid to update when the value of a combo box changes. My MainPage.xaml.vb file currently looks like this: Partial Public Class MainPage Inherits UserControl Private IssueSummaryList As List(Of IssueSummary) Public Sub New() GetDummyIssueSummary("Day") InitializeComponent() dgIssueSummary.ItemsSource = IssueSummaryList 'dgIssueSummary.DataContext = IssueSummaryList ' End Sub Private Sub GetDummyIssueSummary(ByVal timeInterval As String) Dim lst As New List(Of IssueSummary)() 'Generate dummy data for lst ' IssueSummaryList = lst End Sub Private Sub ComboBox_SelectionChanged(ByVal sender As System.Object, ByVal e As System.Windows.Controls.SelectionChangedEventArgs) Dim cboBox As ComboBox = CType(sender, ComboBox) Dim cboBoxItem As ComboBoxItem = CType(cboBox.SelectedValue, ComboBoxItem) GetDummyIssueSummary(cboBoxItem.Content.ToString()) End Sub End Class My XAML currently looks this for the DataGrid: <sdk:DataGrid x:Name="dgIssueSummary" AutoGenerateColumns="False" > <sdk:DataGrid.Columns> <sdk:DataGridTextColumn Binding="{Binding ProblemType}" Header="Problem Type"/> <sdk:DataGridTextColumn Binding="{Binding Count}" Header="Count"/> </sdk:DataGrid.Columns> </sdk:DataGrid> The problem is that if I set the value of the ItemsSource property of the data grid equal to IssueSummaryList, it will display the data when it loads, but it won't update when the underlying IssueSummaryList collection changes. If I set the DataContext of the grid to be IssueSummaryList, no data will be displayed when it renders. I must not understand how ItemsSource and DataContext are supposed to function, because I expect one of those properties to "just work" when I assign a List object to them. What do I need to understand and change in my code so that as data changes in the List, the data in the grid is updated?

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  • Idiomatic default sort using WCF RIA, EF4, Silverlight?

    - by Duncan Bayne
    I've got two Silverlight 4.0 ComboBoxes; the second displays the children of the entity selected in the first: <ComboBox Name="cmbThings" ItemsSource="{Binding Path=Things,Mode=TwoWay}" DisplayMemberPath="Name" SelectionChanged="CmbThingsSelectionChanged" /> <ComboBox Name="cmbChildThings" ItemsSource="{Binding Path=SelectedThing.ChildThings,Mode=TwoWay}" DisplayMemberPath="Name" /> The code behind the view provides a (simple, hacky) way to databind those ComboBoxes, by loading Entity Framework 4.0 entities through a WCF RIA service: public EntitySet<Thing> Things { get; private set; } public Thing SelectedThing { get; private set; } protected override void OnNavigatedTo(NavigationEventArgs e) { var context = new SortingDomainContext(); context.Load(context.GetThingsQuery()); context.Load(context.GetChildThingsQuery()); Things = context.Things; DataContext = this; } private void CmbThingsSelectionChanged(object sender, SelectionChangedEventArgs e) { SelectedThing = (Thing) cmbThings.SelectedItem; if (PropertyChanged != null) { PropertyChanged.Invoke(this, new PropertyChangedEventArgs("SelectedThing")); } } public event PropertyChangedEventHandler PropertyChanged; What I'd like to do is have both combo boxes sort their contents alphabetically, and I'd like to specify that behaviour in the XAML if at all possible. Could someone please tell me what is the idiomatic way of doing this with the SL4 / EF4 / WCF RIA technology stack?

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  • Binding DataGridComboBoxColumn to a one to many entity framework relation

    - by Cristian
    I have two tables in the model, one table contains entries related to the other table in a one to many relations, for example: Table User ID Name Table Comments ID UserID Title Text I want to show a datagrid in a WPF window with two columns, one text column with the User name and another column with a combobox showing all the comments made by the user. The datagrid definition is like this: <DataGrid AutoGenerateColumns="False" [layout options...] Name="dataGrid1" ItemsSource="{Binding}"> <DataGrid.Columns> <DataGridTextColumn Header="Name" Binding="{Binding Path=Name}"/> <DataGridComboBoxColumn Header="Comments" SelectedValueBinding="{Binding Path=UserID}" SelectedValuePath="ID" DisplayMemberPath="Title" ItemsSource="{Binding Path=Comments}" /> </DataGrid.Columns> </DataGrid> in the code I assign the DataContext like this: dataGrid1.DataContext = entities.Users; The entity User has a property named Comments that leads to all the comments made by the user. The queries are returning data and the user names are shown but the combobox is not being filled. May be the approach is totally wrong or I'm just missing a very simple point here, I'm opened to learn better methods to do this. Thanks

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  • Declare a Nullable int (int?) using XAML

    - by Nate Zaugg
    I am trying to bind a combo box to a property on my ViewModel. The target type is short? and I would like to have null be an option. Basically I would like the value of the first item in the combo box be {x:Null}. <ComboBox Grid.Row="9" Grid.Column="1" SelectedValue="{Binding Priority}"> <clr:Int16></clr:Int16> <clr:Int16>1</clr:Int16> <clr:Int16>2</clr:Int16> <clr:Int16>3</clr:Int16> <clr:Int16>4</clr:Int16> <clr:Int16>5</clr:Int16> <clr:Int16>6</clr:Int16> <clr:Int16>7</clr:Int16> <clr:Int16>8</clr:Int16> <clr:Int16>9</clr:Int16> <clr:Int16>10</clr:Int16> </ComboBox> Any Suggestions?

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  • TRibbon's large button's image is not centered...any ideas? easy to demonstrate at design-time.

    - by X-Ray
    i'm using delphi 2009 (updates 1, 2, 3, 4). i'm seeing something quite peculiar. the image on the button is not centered in the button when i have a large button with a large glyph! rather than being centered, the left part of the glyph starts at the center of the button. a clue is that when i: go into the action editor and select the action use the ImageIndex combobox in the object inspector, the list is empty (normally i'd see the available images in the combobox). it seems as though there's an image width property i've failed to set or an imagelist not correctly configured. i've expected the glyph on a large button should be 32x32. try the following: paste these components into an empty form add a 32x32 image to the image list set the Action1 imageindex to 0 you'll immediately see what i mean! can anyone tell me why it looks that way? i find it interesting that the ribbon demo app doesn't show this problem. i even tried the same image. thank you! object ActionManager1: TActionManager ActionBars = < item Items = < item Action = Action1 Caption = '&Action1' ImageIndex = 0 CommandProperties.ButtonSize = bsLarge end> ActionBar = RibbonGroup1 end> LargeDisabledImages = img3232 LargeImages = img3232 Left = 376 Top = 184 StyleName = 'Ribbon - Luna' object Action1: TAction Caption = 'Action1' ImageIndex = 0 end end object Ribbon1: TRibbon Left = 0 Top = 0 Width = 693 Height = 147 ActionManager = ActionManager1 Caption = 'Ribbon1' Tabs = < item Caption = 'RibbonPage1' Page = RibbonPage1 end> ExplicitLeft = 232 ExplicitTop = 80 ExplicitWidth = 0 DesignSize = ( 693 147) StyleName = 'Ribbon - Luna' object RibbonPage1: TRibbonPage Left = 0 Top = 54 Width = 692 Height = 93 Caption = 'RibbonPage1' Index = 0 object RibbonGroup1: TRibbonGroup Left = 4 Top = 3 Width = 54 Height = 86 ActionManager = ActionManager1 Caption = 'RibbonGroup1' GroupIndex = 0 end end end object img3232: TImageList Height = 32 Width = 32 Left = 376 Top = 256 end

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  • Detect if any USB drive is detected or if not using WinForm Application in Visual C#

    - by Pavan Kumar
    I want to do the following things in my application 1) I want to display whether any USB drive is inserted or not in my application to prompt the user to insert a USB drive. I just want to notify the user if any USB dirve is inserted else prompt him to insert one using a label or something (i want to avoid messagebox as it will keep appearing whenever a device is inserted or removed. It will be irritating for the end user) in my Visual C# WinForm Application. If any USB drive is present display "USB drive detected" in the label. The user may add one or more USB sticks but the status will remain same. When there is none then the status of the label will change to "No USB drives found.Please insert a USB drive". 2) When one or more USB drive is added the volume name with the drive letter for example "James(F:)" is added to the Combobox list. The combobox list also needs to remove the entry for the USB drive added in the list automatically when it is removed . So when there is no USB the list should be empty and the label will again prompt user to insert a USB stick or drive.

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  • Detect if any USB drive is detected or not using WinForm Application in Visual C#

    - by Pavan Kumar
    I want to do the following things in my application 1) I want to display whether any USB drive is inserted or not in my application to prompt the user to insert a USB drive. I just want to notify the user if any USB dirve is inserted else prompt him to insert one using a label or something (i want to avoid messagebox as it will keep appearing whenever a device is inserted or removed. It will be irritating for the end user) in my Visual C# WinForm Application. If any USB drive is present display "USB drive detected" in the label. The user may add one or more USB sticks but the status will remain same. When there is none then the status of the label will change to "No USB drives found.Please insert a USB drive". 2) When one or more USB drive is added the volume name with the drive letter for example "James(F:)" is added to the Combobox list. The combobox list also needs to remove the entry for the USB drive added in the list automatically when it is removed . So when there is no USB the list should be empty and the label will again prompt user to insert a USB stick or drive.

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  • Problem with Binding Multiple Objects on WPF

    - by Diego Modolo Ribeiro
    Hi, I'm developing a user control called SearchBox, that will act as a replacer for ComboBox for multiple records, as the performance in ComboBox is low for this scenario, but I'm having a big binding problem. I have a base control with a DependencyProperty called SelectedItem, and my SearchControl shows that control so that the user can select the record. The SearchControl also has a DependencyProperty called SelectedItem on it, and it is being updated when the user selects something on the base control, but the UI, wich has the SearchControl, is not being updated. I used a null converter so that I could see if the property was updating, but it's not. Below is some of the code: This is the UI: <NectarControles:MaskedSearchControl x:Name="teste" Grid.Row="0" Grid.Column="1" Height="21" ItemsSource="{Binding C001_Lista}" DisplayMember="C001_Codigo" Custom:CustomizadorTextBox.CodigoCampo="C001_Codigo" ViewType="{x:Type C001:C001_Search}" ViewModelType="{x:Type C001_ViewModel:C001_ViewModel}" SelectedItem="{Binding Path=Instancia.C001_Holding, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource DebuggingConverter}}"> </NectarControles:MaskedSearchControl> This is the relevante part of the SearchControl: Binding selectedItemBinding = new Binding("SelectedItem"); selectedItemBinding.Source = this.SearchControlBase; selectedItemBinding.Mode = BindingMode.TwoWay; selectedItemBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged; this.SetBinding(SelectedItemProperty, selectedItemBinding); ... public System.Data.Objects.DataClasses.IEntityWithKey SelectedItem { get { return (System.Data.Objects.DataClasses.IEntityWithKey)GetValue(SelectedItemProperty); } set { SetValue(SelectedItemProperty, value); if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("SelectedItem")); } } Please someone help me... Tks...

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