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  • Binding using ElementName for a control within the Grid\ListView

    - by i2nfo
    Hi I am currently busy with a WPF application that uses a "GridView". There are several template columns one of which is a ComboBox in column 3 named cmbInputControlType. What I would like to do using my Converter class, which I have already created, is binding the visibility of the TextBox(txtFrom) in column 4 to the selected value of the ComboBox(Column 3). Basically if you select a value from the the ComboBox(cmbInputControlType - column 3), it must update teh visibility of the TextBox(txtFrom - column 4) <ListView Height="150" ScrollViewer.HorizontalScrollBarVisibility="Auto" ScrollViewer.VerticalScrollBarVisibility="Auto" Width="435" HorizontalAlignment="Center" Margin="5,0,5,5" Name="lstInput" VerticalAlignment="Top" SelectionMode="Single" HorizontalContentAlignment="Left"> <ListView.Resources> <local:InputControlTypeConverter x:Key="InputConType" /> </ListView.Resources> <ListView.View> <GridView> <!--Column 1--> <GridViewColumn Header="ParameterName" x:Name="lblParameterName" DisplayMemberBinding="{Binding ParameterName}" Width="100" /> <!--Column 2--> <GridViewColumn Header="DisplayName"> <GridViewColumn.CellTemplate> <DataTemplate> <TextBox x:Name="txtDisplayName" Width="150" /> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> <!--Column 3--> <GridViewColumn Header="ControlType"> <GridViewColumn.CellTemplate> <DataTemplate> <ComboBox x:Name="cmbInputControlType" Width="100" SelectionChanged="cmbInputControlType_SelectionChanged" > <ComboBoxItem Content="TextBox" /> <ComboBoxItem Content="Copy" /> </ComboBox> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> <!--Column 4--> <GridViewColumn Header="From"> <GridViewColumn.CellTemplate> <DataTemplate> <TextBox x:Name="txtCopyFrom" Width="150" Visibility="{Binding ElementName=cmbInputControlType,Path=SelectedItem, Converter={StaticResource InputConType}}" /> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> <!--Column 5--> <GridViewColumn Header="To"> <GridViewColumn.CellTemplate> <DataTemplate> <TextBox x:Name="txtCopyTo" Width="150" /> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> </GridView> </ListView.View> </ListView>

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  • WPF ListView.CurrentChanged too fast for binding

    - by matt
    My case: MVVM ListView+Details(custom UserControl) List bound to MV.Items (IsSynchronizedWithCurrent=true) Details bound to MV.Items.Current MV.Items.Count == 100 about 0.2sec to read details (lazy mode) When I hold the down arrow on the list, very strange things happen: list items order change current changes in the random order CPU usage drastically increments and eventually all hangs. I've read some post that one should start the timer or run handler in the background, but I am not able to do that, since all the binding WPF does for me. Is there some way to instruct the binding in my DetailsControl, to wait a while before accepting CurrentItem? Or should I just resign from the clean solution and write custom code in my MV to handle that?

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  • WPF Binding : Object in a object

    - by Philippe
    I have a form in WPF with 2 textbox : <TextBox Name="txtName" Text="{Binding Contact.Name}"/> <TextBox Name="txtAddressNumber" Text="{Binding Contact.Address.Number}"/> and I have 2 class : public class ContactEntity { public string Name {get;set;} public AddressEntity Address {get;set;} } public class AddressEntity { public int Number {get;set} } The Name property binds fine. But the Number property of the Address object inside the Contact object does not binds. What I'm doing wrong ?

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  • Binding in ContentControl Crash

    - by ImJames
    Can anyone tell me why this crashes my app? There seems to be some endless recursion by I can't figure out why. I get this exception Logical tree depth exceeded while traversing the tree. This could indicate a cycle in the tree <ContentControl Content="{Binding}"> <ContentControl.ContentTemplate> <DataTemplate> <Button Content="{Binding MyString}"/> </DataTemplate> </ContentControl.ContentTemplate> </ContentControl> And this is all I have as Source public MainWindow() { InitializeComponent(); MyString = "Test"; this.DataContext = this; } public string MyString { get; set; }

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  • Wpf vs WinForms for a vb programmer? [closed]

    - by Jeroen
    I am asked by a client to develop an application that is basically a screen on which the user can choose several items to pass the time (used in holding cells in mental hospitals for example). The baisc idea is as follows: TV (choosing this will provide the user with a number of TV streams from the interweb) Radio (...) Games (serveral flash games, also from the interweb) Music (play local music or streams) Draw something (not the game) Create an email Choose lighting settings for the room etc. etc. I am torn between WinForms and WPF for this project. It seems that WPF is the way to go since there is quite a bit of rich media involved but I have a 15 year VB background. The project obviously has a dead line and certain budget that I cannot cross and if I can avoid starting from scratch with some thing that will be nice. Is WPF worth it in this particular case or can I use WinForms with the incorperation of WPF controls? I would very much like to hear your thoughts/comments/suggestions!

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  • A WPF Image Button

    - by psheriff
    Instead of a normal button with words, sometimes you want a button that is just graphical. Yes, you can put an Image control in the Content of a normal Button control, but you still have the button outline, and trying to change the style can be rather difficult. Instead I like creating a user control that simulates a button, but just accepts an image. Figure 1 shows an example of three of these custom user controls to represent minimize, maximize and close buttons for a borderless window. Notice the highlighted image button has a gray rectangle around it. You will learn how to highlight using the VisualStateManager in this blog post.Figure 1: Creating a custom user control for things like image buttons gives you complete control over the look and feel.I would suggest you read my previous blog post on creating a custom Button user control as that is a good primer for what I am going to expand upon in this blog post. You can find this blog post at http://weblogs.asp.net/psheriff/archive/2012/08/10/create-your-own-wpf-button-user-controls.aspx.The User ControlThe XAML for this image button user control contains just a few controls, plus a Visual State Manager. The basic outline of the user control is shown below:<Border Grid.Row="0"        Name="borMain"        Style="{StaticResource pdsaButtonImageBorderStyle}"        MouseEnter="borMain_MouseEnter"        MouseLeave="borMain_MouseLeave"        MouseLeftButtonDown="borMain_MouseLeftButtonDown">  <VisualStateManager.VisualStateGroups>  ... MORE XAML HERE ...  </VisualStateManager.VisualStateGroups>  <Image Style="{StaticResource pdsaButtonImageImageStyle}"         Visibility="{Binding Path=Visibility}"         Source="{Binding Path=ImageUri}"         ToolTip="{Binding Path=ToolTip}" /></Border>There is a Border control named borMain and a single Image control in this user control. That is all that is needed to display the buttons shown in Figure 1. The definition for this user control is in a DLL named PDSA.WPF. The Style definitions for both the Border and the Image controls are contained in a resource dictionary names PDSAButtonStyles.xaml. Using a resource dictionary allows you to create a few different resource dictionaries, each with a different theme for the buttons.The Visual State ManagerTo display the highlight around the button as your mouse moves over the control, you will need to add a Visual State Manager group. Two different states are needed; MouseEnter and MouseLeave. In the MouseEnter you create a ColorAnimation to modify the BorderBrush color of the Border control. You specify the color to animate as “DarkGray”. You set the duration to less than a second. The TargetName of this storyboard is the name of the Border control “borMain” and since we are specifying a single color, you need to set the TargetProperty to “BorderBrush.Color”. You do not need any storyboard for the MouseLeave state. Leaving this VisualState empty tells the Visual State Manager to put everything back the way it was before the MouseEnter event.<VisualStateManager.VisualStateGroups>  <VisualStateGroup Name="MouseStates">    <VisualState Name="MouseEnter">      <Storyboard>        <ColorAnimation             To="DarkGray"            Duration="0:0:00.1"            Storyboard.TargetName="borMain"            Storyboard.TargetProperty="BorderBrush.Color" />      </Storyboard>    </VisualState>    <VisualState Name="MouseLeave" />  </VisualStateGroup></VisualStateManager.VisualStateGroups>Writing the Mouse EventsTo trigger the Visual State Manager to run its storyboard in response to the specified event, you need to respond to the MouseEnter event on the Border control. In the code behind for this event call the GoToElementState() method of the VisualStateManager class exposed by the user control. To this method you will pass in the target element (“borMain”) and the state (“MouseEnter”). The VisualStateManager will then run the storyboard contained within the defined state in the XAML.private void borMain_MouseEnter(object sender,  MouseEventArgs e){  VisualStateManager.GoToElementState(borMain,    "MouseEnter", true);}You also need to respond to the MouseLeave event. In this event you call the VisualStateManager as well, but specify “MouseLeave” as the state to go to.private void borMain_MouseLeave(object sender, MouseEventArgs e){  VisualStateManager.GoToElementState(borMain,     "MouseLeave", true);}The Resource DictionaryBelow is the definition of the PDSAButtonStyles.xaml resource dictionary file contained in the PDSA.WPF DLL. This dictionary can be used as the default look and feel for any image button control you add to a window. <ResourceDictionary  ... >  <!-- ************************* -->  <!-- ** Image Button Styles ** -->  <!-- ************************* -->  <!-- Image/Text Button Border -->  <Style TargetType="Border"         x:Key="pdsaButtonImageBorderStyle">    <Setter Property="Margin"            Value="4" />    <Setter Property="Padding"            Value="2" />    <Setter Property="BorderBrush"            Value="Transparent" />    <Setter Property="BorderThickness"            Value="1" />    <Setter Property="VerticalAlignment"            Value="Top" />    <Setter Property="HorizontalAlignment"            Value="Left" />    <Setter Property="Background"            Value="Transparent" />  </Style>  <!-- Image Button -->  <Style TargetType="Image"         x:Key="pdsaButtonImageImageStyle">    <Setter Property="Width"            Value="40" />    <Setter Property="Margin"            Value="6" />    <Setter Property="VerticalAlignment"            Value="Top" />    <Setter Property="HorizontalAlignment"            Value="Left" />  </Style></ResourceDictionary>Using the Button ControlOnce you make a reference to the PDSA.WPF DLL from your WPF application you will see the “PDSAucButtonImage” control appear in your Toolbox. Drag and drop the button onto a Window or User Control in your application. I have not referenced the PDSAButtonStyles.xaml file within the control itself so you do need to add a reference to this resource dictionary somewhere in your application such as in the App.xaml.<Application.Resources>  <ResourceDictionary>    <ResourceDictionary.MergedDictionaries>      <ResourceDictionary         Source="/PDSA.WPF;component/PDSAButtonStyles.xaml" />    </ResourceDictionary.MergedDictionaries>  </ResourceDictionary></Application.Resources>This will give your buttons a default look and feel unless you override that dictionary on a specific Window or User Control or on an individual button. After you have given a global style to your application and you drag your image button onto a window, the following will appear in your XAML window.<my:PDSAucButtonImage ... />There will be some other attributes set on the above XAML, but you simply need to set the x:Name, the ToolTip and ImageUri properties. You will also want to respond to the Click event procedure in order to associate an action with clicking on this button. In the sample code you download for this blog post you will find the declaration of the Minimize button to be the following:<my:PDSAucButtonImage       x:Name="btnMinimize"       Click="btnMinimize_Click"       ToolTip="Minimize Application"       ImageUri="/PDSA.WPF;component/Images/Minus.png" />The ImageUri property is a dependency property in the PDSAucButtonImage user control. The x:Name and the ToolTip we get for free. You have to create the Click event procedure yourself. This is also created in the PDSAucButtonImage user control as follows:private void borMain_MouseLeftButtonDown(object sender,  MouseButtonEventArgs e){  RaiseClick(e);}public delegate void ClickEventHandler(object sender,  RoutedEventArgs e);public event ClickEventHandler Click;protected void RaiseClick(RoutedEventArgs e){  if (null != Click)    Click(this, e);}Since a Border control does not have a Click event you will create one by using the MouseLeftButtonDown on the border to fire an event you create called “Click”.SummaryCreating your own image button control can be done in a variety of ways. In this blog post I showed you how to create a custom user control and simulate a button using a Border and Image control. With just a little bit of code to respond to the MouseLeftButtonDown event on the border you can raise your own Click event. Dependency properties, such as ImageUri, allow you to set attributes on your custom user control. Feel free to expand on this button by adding additional dependency properties, change the resource dictionary, and even the animation to make this button look and act like you want.NOTE: You can download the sample code for this article by visiting my website at http://www.pdsa.com/downloads. Select “Tips & Tricks”, then select “A WPF Image  Button” from the drop down list.

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  • Why binding is not a native feature in most of the languages?

    - by Gulshan
    IMHO binding a variable to another variable or an expression is a very common scenario in mathematics. In fact, in the beginning, many students think the assignment operator(=) is some kind of binding. But in most of the languages, binding is not supported as a native feature. In some languages like C#, binding is supported in some cases with some conditions fulfilled. But IMHO implementing this as a native feature was as simple as changing the following code- int a,b,sum; sum := a + b; a = 10; b = 20; a++; to this- int a,b,sum; a = 10; sum = a + b; b = 20; sum = a + b; a++; sum = a + b; Meaning placing the binding instruction as assignments after every instruction changing values of any of the variable contained in the expression at right side. After this, trimming redundant instructions (or optimization in assembly after compilation) will do. So, why it is not supported natively in most of the languages. Specially in the C-family of languages? Update: From different opinions, I think I should define this proposed "binding" more precisely- This is one way binding. Only sum is bound to a+b, not the vice versa. The scope of the binding is local. Once the binding is established, it cannot be changed. Meaning, once sum is bound to a+b, sum will always be a+b. Hope the idea is clearer now. Update 2: I just wanted this P# feature. Hope it will be there in future.

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  • .NET WPF Charting Control

    - by Randy Minder
    We're very close to wrapping up a WPF dashboarding application using SSRS (.RDLC files) and the Microsoft Report Viewer. For a number of reasons, this combination has turned out to be less than what we had hoped. One of the biggest problems is that the Microsoft Report Viewer is not a WPF control. We've had other problems as well. Our app consists of at least 5 tabs and each tab has at least 4-5 charts on it. All the charts update on their own timed schedules (like every 15-30 minutes). For the next version I'd like to explore other .NET charting tools for WPF. Performance is absolutely critical. As is resource usage. The tool must support WPF and as many chart types as possible. Can anyone recommend (or not recommend) charting tools they have experience with? We own Telerik and I've dabbled with their charting control. At the 30K foot level, it seems quite nice.

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  • WPF DataGrid issue with db40

    - by Rich Blumer
    I am using the following code to populate a wpf datagrid with items in my db4o OODB: IObjectContainer db = Db4oEmbedded.OpenFile(Db4oEmbedded.NewConfiguration(), "C:\Dev\ContractKeeper\Database\ContractKeeper.yap"); var contractTypes = db.Query(typeof(ContractType)); this.dataGrid1.ItemsSource = contractTypes.ToList(); Here is the XAML: <Window x:Class="ContractKeeper.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:dg="http://schemas.microsoft.com/wpf/2008/toolkit" Title="Window1" Height="300" Width="300"> <Grid> <dg:DataGrid AutoGenerateColumns="True" Margin="12,102,12,24" Name="dataGrid1" /> </Grid> </Window> When the items get bound to the datagrid, the gridlines appear like there are records but no data is displayed. Has anyone had this issue with db4o and the wpf datagrid?

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  • User Control inherit from ListBox in Wpf?

    - by Rev
    Hi. I want to make a user Control in WPf with same properties and events like ListBox.(can add items , remove them , selecting ,...) on way in windows App is use a user control which is inherit form ListBox. but in WPF I don't know how make User Control inherit from ListBox (or other WPF Control)!!! I write this code but it had an exception public partial class InboxListItem : ListBox { public InboxListItem() { InitializeComponent(); } and It's Xaml file <UserControl x:Class="ListBoxControl.InboxListItem" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:myTypes="clr-namespace:ListBoxControl" />

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  • What is Silverlight's relationship -- if any -- to WPF?

    - by xarzu
    I was working with a WPF application and I decided that the controls and graphics I wanted to display on the grid might look better if it was a silverlight component. I thought this way because of all the cool silverlight controls that look very flash-like. But now that I have gottem my Visual Studio 2010 set up with SIlverlight, it seems that every silverlight app I can make are ASP.NET in nature. It seems that instead of a cool GUI control to make, Silverlight is telling me that it is primarely a dataflow sort of application for the web. What is the relationship, if any, between WPF and Silverlight. Can I or can I not put a silverlight control into my existing WPF application?

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  • WPF Show Open TabItem Names in a List View

    - by mr justinator
    I'm trying to display a list of open tab names in a listview or listbox (recommendations?). Been going through the different type of binding options and I'm able to bind to a single tab name but it displays vertical instead of horizontal. Here is my XAML: <ListView DockPanel.Dock="Left" Height="352" Name="listView1" Width="132" ItemsSource="{Binding ElementName=RulesTab, Path=Name}" IsSynchronizedWithCurrentItem="True" FlowDirection="LeftToRight" HorizontalAlignment="Left" HorizontalContentAlignment="Left" DataContext="{Binding}"> Any pointers would be greatly appreciated as I'd like to be able to see a list of all the tabs open and then double click on one to bring the tab into focus. Many thanks!

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  • Dependency Property Set Priority: CodeBehind vs. XAML

    - by LukePet
    When I initialize a control property from code, the binding to the same property defined on XAML don't work. Why? For Example, I set control properties on startup with this statements: myControl.SetValue(UIElement.VisibilityProperty, DefaultProp.Visibility); myControl.SetValue(UIElement.IsEnabledProperty, DefaultProp.IsEnabled); and on xaml I bind the property of myControl in this way: IsEnabled="{Binding Path=IsKeyControlEnabled}" now, when the property "IsKeyControlEnabled" changes to false, myControl remains enabled (because it's initialize with true value). How can I do?

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  • JavaScript Data Binding Frameworks

    - by dwahlin
    Data binding is where it’s at now days when it comes to building client-centric Web applications. Developers experienced with desktop frameworks like WPF or web frameworks like ASP.NET, Silverlight, or others are used to being able to take model objects containing data and bind them to UI controls quickly and easily. When moving to client-side Web development the data binding story hasn’t been great since neither HTML nor JavaScript natively support data binding. This means that you have to write code to place data in a control and write code to extract it. Although it’s certainly feasible to do it from scratch (many of us have done it this way for years), it’s definitely tedious and not exactly the best solution when it comes to maintenance and re-use. Over the last few years several different script libraries have been released to simply the process of binding data to HTML controls. In fact, the subject of data binding is becoming so popular that it seems like a new script library is being released nearly every week. Many of the libraries provide MVC/MVVM pattern support in client-side JavaScript apps and some even integrate directly with server frameworks like Node.js. Here’s a quick list of a few of the available libraries that support data binding (if you like any others please add a comment and I’ll try to keep the list updated): AngularJS MVC framework for data binding (although closely follows the MVVM pattern). Backbone.js MVC framework with support for models, key/value binding, custom events, and more. Derby Provides a real-time environment that runs in the browser an in Node.js. The library supports data binding and templates. Ember Provides support for templates that automatically update as data changes. JsViews Data binding framework that provides “interactive data-driven views built on top of JsRender templates”. jQXB Expression Binder Lightweight jQuery plugin that supports bi-directional data binding support. KnockoutJS MVVM framework with robust support for data binding. For an excellent look at using KnockoutJS check out John Papa’s course on Pluralsight. Meteor End to end framework that uses Node.js on the server and provides support for data binding on  the client. Simpli5 JavaScript framework that provides support for two-way data binding. WinRT with HTML5/JavaScript If you’re building Windows 8 applications using HTML5 and JavaScript there’s built-in support for data binding in the WinJS library.   I won’t have time to write about each of these frameworks, but in the next post I’m going to talk about my (current) favorite when it comes to client-side JavaScript data binding libraries which is AngularJS. AngularJS provides an extremely clean way – in my opinion - to extend HTML syntax to support data binding while keeping model objects (the objects that hold the data) free from custom framework method calls or other weirdness. While I’m writing up the next post, feel free to visit the AngularJS developer guide if you’d like additional details about the API and want to get started using it.

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  • WPF TabControl - how to preserve control state within tab items (MVVM pattern)

    - by Tim Coulter
    I am a newcomer to WPF, attempting to build a project that follows the recommendations of Josh Smith's excellent article describing The Model-View-ViewModel Design Pattern. Using Josh's sample code as a base, I have created a simple application that contains a number of "workspaces", each represented by a tab in a TabControl. In my application, a workspace is a document editor that allows a hierarchical document to be manipulated via a TreeView control. Although I have succeeded in opening multiple workspaces and viewing their document content in the bound TreeView control, I find that the TreeView "forgets" its state when switching between tabs. For example, if the TreeView in Tab1 is partially expanded, it will be shown as fully collapsed after switching to Tab2 and returning to Tab1. This behaviour appears to apply to all aspects of control state for all controls. After some experimentation, I have realized that I can preserve state within a TabItem by explicitly binding each control state property to a dedicated property on the underlying ViewModel. However, this seems like a lot of additional work, when I simply want all my controls to remember their state when switching between workspaces. I assume I am missing something simple, but I am not sure where to look for the answer. Any guidance would be much appreciated. Thanks, Tim Update: As requested, I will attempt to post some code that demonstrates this problem. However, since the data that underlies the TreeView is complex, I will post a simplified example that exhibits the same symtoms. Here is the XAML from the main window: <TabControl IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding Path=Docs}"> <TabControl.ItemTemplate> <DataTemplate> <ContentPresenter Content="{Binding Path=Name}" /> </DataTemplate> </TabControl.ItemTemplate> <TabControl.ContentTemplate> <DataTemplate> <view:DocumentView /> </DataTemplate> </TabControl.ContentTemplate> </TabControl> The above XAML correctly binds to an ObservableCollection of DocumentViewModel, whereby each member is presented via a DocumentView. For the simplicity of this example, I have removed the TreeView (mentioned above) from the DocumentView and replaced it with a TabControl containing 3 fixed tabs: <TabControl> <TabItem Header="A" /> <TabItem Header="B" /> <TabItem Header="C" /> </TabControl> In this scenario, there is no binding between the DocumentView and the DocumentViewModel. When the code is run, the inner TabControl is unable to remember its selection when the outer TabControl is switched. However, if I explicitly bind the inner TabControl's SelectedIndex property ... <TabControl SelectedIndex="{Binding Path=SelectedDocumentIndex}"> <TabItem Header="A" /> <TabItem Header="B" /> <TabItem Header="C" /> </TabControl> ... to a corresponding dummy property on the DocumentViewModel ... public int SelecteDocumentIndex { get; set; } ... the inner tab is able to remember its selection. I understand that I can effectively solve my problem by applying this technique to every visual property of every control, but I am hoping there is a more elegant solution.

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  • MVVM: Binding radio buttons to a view model?

    - by David Veeneman
    I have been trying to bind a group of radio buttons to a view model using the IsChecked button. After reviewing other posts, it appears that the IsChecked property simply doesn't work. I have put together a short demo that reproduces the problem, which I have included below. Here is my question: Is there a straightforward and reliable way to bind radio buttons using MVVM? Thanks. Additional information: The IsChecked property doesn't work for two reasons: When a button is selected, the IsChecked properties of other buttons in the group don't get set to false. When a button is selected, its own IsChecked property does not get set after the first time the button is selected. I am guessing that the binding is getting trashed by WPF on the first click. Demo project: Here is the code and markup for a simple demo that reproduces the problem. Create a WPF project and replace the markup in Window1.xaml with the following: <Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300" Loaded="Window_Loaded"> <StackPanel> <RadioButton Content="Button A" IsChecked="{Binding Path=ButtonAIsChecked, Mode=TwoWay}" /> <RadioButton Content="Button B" IsChecked="{Binding Path=ButtonBIsChecked, Mode=TwoWay}" /> </StackPanel> </Window> Replace the code in Window1.xaml.cs with the following code (a hack), which sets the view model: using System.Windows; namespace WpfApplication1 { /// <summary> /// Interaction logic for Window1.xaml /// </summary> public partial class Window1 : Window { public Window1() { InitializeComponent(); } private void Window_Loaded(object sender, RoutedEventArgs e) { this.DataContext = new Window1ViewModel(); } } } Now add the following code to the project as Window1ViewModel.cs: using System.Windows; namespace WpfApplication1 { public class Window1ViewModel { private bool p_ButtonAIsChecked; /// <summary> /// Summary /// </summary> public bool ButtonAIsChecked { get { return p_ButtonAIsChecked; } set { p_ButtonAIsChecked = value; MessageBox.Show(string.Format("Button A is checked: {0}", value)); } } private bool p_ButtonBIsChecked; /// <summary> /// Summary /// </summary> public bool ButtonBIsChecked { get { return p_ButtonBIsChecked; } set { p_ButtonBIsChecked = value; MessageBox.Show(string.Format("Button B is checked: {0}", value)); } } } } To reproduce the problem, run the app and click Button A. A message box will appear, saying that Button A's IsChecked property has been set to true. Now select Button B. Another message box will appear, saying that Button B's IsChecked property has been set to true, but there is no message box indicating that Button A's IsChecked property has been set to false--the property hasn't been changed. Now click Button A again. The button will be selected in the window, but no message box will appear--the IsChecked property has not been changed. Finally, click on Button B again--same result. The IsChecked property is not updated at all for either button after the button is first clicked.

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  • WPF: Binding to ListBoxItem.IsSelected doesn't work for off-screen items

    - by Qwertie
    In my program I have a set of view-model objects to represent items in a ListBox (multi-select is allowed). The viewmodel has an IsSelected property that I would like to bind to the ListBox so that selection state is managed in the viewmodel rather than in the listbox itself. However, apparently the ListBox doesn't maintain bindings for most of the off-screen items, so in general the IsSelected property is not synchronized correctly. Here is some code that demonstrates the problem. First XAML: <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock>Number of selected items: </TextBlock> <TextBlock Text="{Binding NumItemsSelected}"/> </StackPanel> <ListBox ItemsSource="{Binding Items}" Height="200" SelectionMode="Extended"> <ListBox.ItemContainerStyle> <Style TargetType="{x:Type ListBoxItem}"> <Setter Property="IsSelected" Value="{Binding IsSelected}"/> </Style> </ListBox.ItemContainerStyle> </ListBox> <Button Name="TestSelectAll" Click="TestSelectAll_Click">Select all</Button> </StackPanel> C# Select All handler: private void TestSelectAll_Click(object sender, RoutedEventArgs e) { foreach (var item in _dataContext.Items) item.IsSelected = true; } C# viewmodel: public class TestItem : NPCHelper { TestDataContext _c; string _text; public TestItem(TestDataContext c, string text) { _c = c; _text = text; } public override string ToString() { return _text; } bool _isSelected; public bool IsSelected { get { return _isSelected; } set { _isSelected = value; FirePropertyChanged("IsSelected"); _c.FirePropertyChanged("NumItemsSelected"); } } } public class TestDataContext : NPCHelper { public TestDataContext() { for (int i = 0; i < 200; i++) _items.Add(new TestItem(this, i.ToString())); } ObservableCollection<TestItem> _items = new ObservableCollection<TestItem>(); public ObservableCollection<TestItem> Items { get { return _items; } } public int NumItemsSelected { get { return _items.Where(it => it.IsSelected).Count(); } } } public class NPCHelper : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; public void FirePropertyChanged(string prop) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(prop)); } } Two separate problems can be observed. If you click the first item and then press Shift+End, all 200 items should be selected; however, the heading reports that only 21 items are selected. If you click "Select all" then all items are indeed selected. If you then click an item in the ListBox you would expect the other 199 items to be deselected, but this does not happen. Instead, only the items that are on the screen (and a few others) are deselected. All 199 items will not be deselected unless you first scroll through the list from beginning to end (and even then, oddly enough, it doesn't work if you perform scrolling with the little scroll box). My questions are: Can someone explain precisely why this occurs? Can I avoid or work around the problem?

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  • MEF CompositionInitializer for WPF

    - by Reed
    The Managed Extensibility Framework is an amazingly useful addition to the .NET Framework.  I was very excited to see System.ComponentModel.Composition added to the core framework.  Personally, I feel that MEF is one tool I’ve always been missing in my .NET development. Unfortunately, one perfect scenario for MEF tends to fall short of it’s full potential is in Windows Presentation Foundation development.  In particular, there are many times when the XAML parser constructs objects in WPF development, which makes composition of those parts difficult.  The current release of MEF (Preview Release 9) addresses this for Silverlight developers via System.ComponentModel.Composition.CompositionInitializer.  However, there is no equivalent class for WPF developers. The CompositionInitializer class provides the means for an object to compose itself.  This is very useful with WPF and Silverlight development, since it allows a View, such as a UserControl, to be generated via the standard XAML parser, and still automatically pull in the appropriate ViewModel in an extensible manner.  Glenn Block has demonstrated the usage for Silverlight in detail, but the same issues apply in WPF. As an example, let’s take a look at a very simple case.  Take the following XAML for a Window: <Window x:Class="WpfApplication1.MainView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="220" Width="300"> <Grid> <TextBlock Text="{Binding TheText}" /> </Grid> </Window> This does nothing but create a Window, add a simple TextBlock control, and use it to display the value of our “TheText” property in our DataContext class.  Since this is our main window, WPF will automatically construct and display this Window, so we need to handle constructing the DataContext and setting it ourselves. We could do this in code or in XAML, but in order to do it directly, we would need to hard code the ViewModel type directly into our XAML code, or we would need to construct the ViewModel class and set it in the code behind.  Both have disadvantages, and the disadvantages grow if we’re using MEF to compose our ViewModel. Ideally, we’d like to be able to have MEF construct our ViewModel for us.  This way, it can provide any construction requirements for our ViewModel via [ImportingConstructor], and it can handle fully composing the imported properties on our ViewModel.  CompositionInitializer allows this to occur. We use CompositionInitializer within our View’s constructor, and use it for self-composition of our View.  Using CompositionInitializer, we can modify our code behind to: public partial class MainView : Window { public MainView() { InitializeComponent(); CompositionInitializer.SatisfyImports(this); } [Import("MainViewModel")] public object ViewModel { get { return this.DataContext; } set { this.DataContext = value; } } } We then can add an Export on our ViewModel class like so: [Export("MainViewModel")] public class MainViewModel { public string TheText { get { return "Hello World!"; } } } MEF will automatically compose our application, decoupling our ViewModel injection to the DataContext of our View until runtime.  When we run this, we’ll see: There are many other approaches for using MEF to wire up the extensible parts within your application, of course.  However, any time an object is going to be constructed by code outside of your control, CompositionInitializer allows us to continue to use MEF to satisfy the import requirements of that object. In order to use this from WPF, I’ve ported the code from MEF Preview 9 and Glenn Block’s (now obsolete) PartInitializer port to Windows Presentation Foundation.  There are some subtle changes from the Silverlight port, mainly to handle running in a desktop application context.  The default behavior of my port is to construct an AggregateCatalog containing a DirectoryCatalog set to the location of the entry assembly of the application.  In addition, if an “Extensions” folder exists under the entry assembly’s directory, a second DirectoryCatalog for that folder will be included.  This behavior can be overridden by specifying a CompositionContainer or one or more ComposablePartCatalogs to the System.ComponentModel.Composition.Hosting.CompositionHost static class prior to the first use of CompositionInitializer. Please download CompositionInitializer and CompositionHost for VS 2010 RC, and contact me with any feedback. Composition.Initialization.Desktop.zip Edit on 3/29: Glenn Block has since updated his version of CompositionInitializer (and ExportFactory<T>!), and made it available here: http://cid-f8b2fd72406fb218.skydrive.live.com/self.aspx/blog/Composition.Initialization.Desktop.zip This is a .NET 3.5 solution, and should soon be pushed to CodePlex, and made available on the main MEF site.

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  • Binding Image.Source to String in WPF ?

    - by Mohammad
    I have below XAML code : <Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" DataContext="{Binding RelativeSource={RelativeSource Self}}" WindowStartupLocation="CenterScreen" Title="Window1" Height="300" Width="300"> <Grid> <Image x:Name="TestImage" Source="{Binding Path=ImageSource}" /> </Grid> </Window> Also, there is a method that makes an Image from a Base64 string : Image Base64StringToImage(string base64ImageString) { try { byte[] b; b = Convert.FromBase64String(base64ImageString); MemoryStream ms = new System.IO.MemoryStream(b); System.Drawing.Image img = System.Drawing.Image.FromStream(ms); ////////////////////////////////////////////// //convert System.Drawing.Image to WPF image System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(img); IntPtr hBitmap = bmp.GetHbitmap(); System.Windows.Media.ImageSource imageSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions()); Image wpfImage = new Image(); wpfImage.Source = imageSource; wpfImage.Width = wpfImage.Height = 16; ////////////////////////////////////////////// return wpfImage; } catch { Image img1 = new Image(); img1.Source = new BitmapImage(new Uri(@"/passwordManager;component/images/TreeView/empty-bookmark.png", UriKind.Relative)); img1.Width = img1.Height = 16; return img1; } } Now, I'm gonna bind TestImage to the output of Base64StringToImage method. I've used the following way : public string ImageSource { get; set; } ImageSource = Base64StringToImage("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").Source.ToString(); but nothing happen. How can I fix it ? BTW, I'm dead sure that the base64 string is correct

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  • Binding update adds news series to WPF Toolkit chart (instead of replacing/updating series)

    - by Mal Ross
    I'm currently recoding a bar chart in my app to make use of the Chart class in the WPF Toolkit. Using MVVM, I'm binding the ItemsSource of a ColumnSeries in my chart to a property on my viewmodel. Here's the relevant XAML: <charting:Chart> <charting:ColumnSeries ItemsSource="{Binding ScoreDistribution.ClassScores}" IndependentValuePath="ClassName" DependentValuePath="Score"/> </charting:Chart> And the property on the viewmodel: // NB: viewmodel derived from Josh Smith's BindableObject public class ExamResultsViewModel : BindableObject { // ... private ScoreDistributionByClass _scoreDistribution; public ScoreDistributionByClass ScoreDistribution { get { return _scoreDistribution; } set { if (_scoreDistribution == value) { return; } _scoreDistribution = value; RaisePropertyChanged(() => ScoreDistribution); } } However, when I update the ScoreDistribution property (by setting it to a new ScoreDistribution object), the chart gets an additional series (based on the new ScoreDistribution) as well as keeping the original series (based on the previous ScoreDistribution). To illustrate this, here are a couple of screenshots showing the chart before an update (with a single data point in ScoreDistribution.ClassScores) and after it (now with 3 data points in ScoreDistribution.ClassScores): Now, I realise there are other ways I could be doing this (e.g. changing the contents of the original ScoreDistribution object rather than replacing it entirely), but I don't understand why it's going wrong in its current form. Can anyone help?

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  • Wpf binding problem

    - by Erez
    I have in my window a rectangle with a tooltip, Clicking the button suppose to change the tooltip text but it doesn't. XAML: <Grid> <Grid.RowDefinitions> <RowDefinition/> <RowDefinition/> <RowDefinition/> </Grid.RowDefinitions> <Grid.Resources> <ToolTip x:Key="@tooltip"> <TextBlock Text="{Binding Name}"/> </ToolTip> </Grid.Resources> <TextBlock Text="{Binding Name}" Background="LightCoral" /> <Rectangle Width="200" Height="200" Fill="LightBlue" VerticalAlignment="Center" HorizontalAlignment="Center" ToolTip="{DynamicResource @tooltip}" Grid.Row="1"/> <Button Click="Button_Click" Grid.Row="2" Margin="20">Click Me</Button> </Grid> code behind: public partial class Window1 : Window { public Window1() { DataContext = new Person { Name = "A" }; InitializeComponent(); } private void Button_Click(object sender, RoutedEventArgs e) { DataContext = new Person { Name = "B" }; } }

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  • Two Way Data Binding With a Object in WPF,Image Control

    - by Candy
    Sorry, my English is not very good, I have a object "Stuffs" "Stuffs" have a Property “Icon” now: xaml <Button Click="Button_Click"><Image Width="80" Height="80" Source="{Binding Path=Icon,Converter={StaticResource ImageConverter}}"/></Button> cs private void Button_Click(object sender, RoutedEventArgs e) { IconFloder.Title = "Icon"; String IconFloderPath = AppDomain.CurrentDomain.BaseDirectory + ItemIconFloder; if (!System.IO.Directory.Exists(IconFloderPath)) System.IO.Directory.CreateDirectory(IconFloderPath); IconFloder.InitialDirectory = IconFloderPath; IconFloder.Filter = "Image File|*.jpeg"; IconFloder.ValidateNames = true; IconFloder.CheckPathExists = true; IconFloder.CheckFileExists = true; if (IconFloder.ShowDialog() == true) { HideImage.Text = ItemIconFloder + "\\" + IconFloder.SafeFileName; ((sender as Button).Content as Image).Source = new ImageConverter().Convert(ItemIconFloder + "\\" + IconFloder.SafeFileName, Type.GetType("System.Windows.Media.ImageSource"), null, new System.Globalization.CultureInfo("en-US")) as ImageSource; } } class ImageConverter:IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { if (value is string&&!String.IsNullOrEmpty(value.ToString())) { try { return new BitmapImage(new Uri(AppDomain.CurrentDomain.BaseDirectory + value)); } catch { } } return null; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } } I would like to click buttons, change the picture, Also change Data Binding Stuffs.Icon But failed,I have no idea?I need help? I do not know whether I speak clearly

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  • XAML Binding to complex value objects

    - by Gus
    I have a complex value object class that has 1) a number or read-only properties; 2) a private constructor; and 3) a number of static singleton instance properties [so the properties of a ComplexValueObject never change and an individual value is instantiated once in the application's lifecycle]. public class ComplexValueClass { /* A number of read only properties */ private readonly string _propertyOne; public string PropertyOne { get { return _propertyOne; } } private readonly string _propertyTwo; public string PropertyTwo { get { return _propertyTwo; } } /* a private constructor */ private ComplexValueClass(string propertyOne, string propertyTwo) { _propertyOne = propertyOne; _propertyTwo = PropertyTwo; } /* a number of singleton instances */ private static ComplexValueClass _complexValueObjectOne; public static ComplexValueClass ComplexValueObjectOne { get { if (_complexValueObjectOne == null) { _complexValueObjectOne = new ComplexValueClass("string one", "string two"); } return _complexValueObjectOne; } } private static ComplexValueClass _complexValueObjectTwo; public static ComplexValueClass ComplexValueObjectTwo { get { if (_complexValueObjectTwo == null) { _complexValueObjectTwo = new ComplexValueClass("string three", "string four"); } return _complexValueObjectTwo; } } } I have a data context class that looks something like this: public class DataContextClass : INotifyPropertyChanged { private ComplexValueClass _complexValueClass; public ComplexValueClass ComplexValueObject { get { return _complexValueClass; } set { _complexValueClass = value; PropertyChanged(this, new PropertyChangedEventArgs("ComplexValueObject")); } } } I would like to write a XAML binding statement to a property on my complex value object that updates the UI whenever the entire complex value object changes. What is the best and/or most concise way of doing this? I have something like: <Object Value="{Binding ComplexValueObject.PropertyOne}" /> but the UI does not update when ComplexValueObject as a whole changes.

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  • Binding UpdateSourceTrigger=Explicit, updates source at program startup

    - by GTD
    I have following code: <Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300"> <Grid> <TextBox Text="{Binding Path=Name, Mode=OneWayToSource, UpdateSourceTrigger=Explicit, FallbackValue=default text}" KeyUp="TextBox_KeyUp" x:Name="textBox1"/> </Grid> public partial class Window1 : Window { public Window1() { InitializeComponent(); } private void TextBox_KeyUp(object sender, KeyEventArgs e) { if (e.Key == Key.Enter) { BindingExpression exp = this.textBox1.GetBindingExpression(TextBox.TextProperty); exp.UpdateSource(); } } } public class ViewModel { public string Name { set { Debug.WriteLine("setting name: " + value); } } } public partial class App : Application { protected override void OnStartup(StartupEventArgs e) { base.OnStartup(e); Window1 window = new Window1(); window.DataContext = new ViewModel(); window.Show(); } } I want to update source only when "Enter" key is pressed in textbox. This works fine. However binding updates source at program startup. How can I avoid this? Am I missing something?

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  • WPF binding problem

    - by xine
    I've got some bindings in UI: <Window x:Class="Tester.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="377" Width="562" xmlns:my="clr-namespace:MyApp"> <Grid> <TextBlock Text="{Binding Path=current.Text}" Name="Text1" /> <TextBlock Text="{Binding Path=current.o.Text}" Name="Text2" /> </Grid> </Window> Code: class Coordinator : INotifyPropertyChanged{ List<Myclass1> list; int currId = 0; public Myclass1 current{ return list[currId]; } public int CurrId { get { return currId; } set { currId = value; this.PropertyChanged(this,new PropertyChangedEventArgs("current")); } } class Myclass1{ public string Text{get;} public Myclass2 o{get;} } class Myclass2{ public string Text{get;} } When currId changes Tex1 in UI changes too,but Text2 doesn't. I'm assuming this happens because Text2's source isn't updated. Does anyone know how to fix it?

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