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  • Get/Set nested property values

    - by Daniel Deer
    I'll try to be more descriptive here. A Few Q's: using: var foo = new Foo() { Bar = new Bar() { Value = "Value" } }; var value = DataBinder.Eval(foo, "Bar.Value"); Or: This one It is possible to retrieve an internal nested property using property path syntax. Is there a way to set/trigger a nested property (a regular property not DependencyProperty) easily with some kind of simple mechanisms as described here? I want to acheive something like: string newValue = "Hello World!"; DataBinder.EvalSet(foo, "Bar.Value", NewValue); Is there any mechanism that support both property path (for nested objects) and XPATHs (if the objects are XPATH navigable of course) ? again, that supports get and set options. Thanks, DD

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  • Binding ComboBox Item with a text property of different DataContext

    - by Jhelumi786
    Hi Everyone, I have a comboBox as below. What I want is to bind the selectedItem value to a Text property of a datacontext so that another DataTemplate can show the Image. Please note that the Combobox and Target Image elements are on two different DataTemplates so that's why I need to update the Text Property (ImageName) ofDataContext at backend. <ComboBox x:Name="cboOverlay" Grid.Row="0" Grid.Column="1" SelectedIndex="0" > <ComboBoxItem Name="BC_OL" IsSelected="True"> <StackPanel Orientation="Horizontal"> <Image Source="Images\BC_OL.jpg" Width="100" Height="25" Canvas.Top="0" Canvas.Left="0" /> <TextBlock Width="100" VerticalAlignment="Center" TextAlignment="Center"><Bold>Image1</Bold></TextBlock> </StackPanel> </ComboBoxItem> <ComboBoxItem Name="Indian_OL"> <StackPanel Orientation="Horizontal"> <Image Source="Images\Indian_OL.jpg" Width="100" Height="25" Canvas.Top="0" Canvas.Left="0" /> <TextBlock Width="100" VerticalAlignment="Center" TextAlignment="Center"><Bold>Image2</Bold></TextBlock> </StackPanel> </ComboBoxItem> </ComboBox> <Image Source="{Binding Path=Image}" Width="81" Height="25" Canvas.Top="0" Canvas.Left="0" />

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  • INotifyPropertyChanged Setter Style

    - by Ivovic
    In order to reflect changes in your data to the UI you have to implement INotifyPropertyChanged, okay. If I look at examples, articles, tutorials etc most of the time the setters look like something in that manner: public string MyProperty { //get [...] set { if (_correspondingField == value) { return; } _correspondingField = value; OnPropertyChanged("MyProperty"); } } No problem so far, only raise the event if you have to, cool. But you could rewrite this code to this: public string MyProperty { //get [...] set { if (_correspondingField != value) { _correspondingField = value; OnPropertyChanged("MyProperty"); } } } It should do the same (?), you only have one place of return, it is less code, it is less boring code and it is more to the point ("only act if necessary" vs "if not necessary do nothing, the other way round act"). So if the second version has its pros compared to the first one, why I see this style rarely? I don't consider myself being smarter than those people that write frameworks, published articles etc, therefore the second version has to have drawbacks. Or is it wrong? Or do I think too much? Thanks in advance

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  • Add Controls to GroupBox which was created dynamically

    - by phil13131
    I add GroupBoxes to an ItemsControl dynamically using: string name_ = "TestName", header_ = "TestHeader" GroupBox MyGroupBox = new GroupBox { Name = name_, Header= header_, Width = 240, Height = 150, Foreground=new SolidColorBrush(Color.FromArgb(255, 0, 0, 0)) }; MyItemsControl.Items.Add(MyGroupBox); Now I need to add content to this GroupBox, like a few TextBlocks created like: TextBlock MyTextBlock = new TextBlock {Text = "test"}; But I can't figure out how to do that. Normally to a Grid or something like that I would just use .Children.Add(MyTextBlock), but that doesn't work here. Also I have to be able to remove specific Items from the ItemsControl again (best would be by the name of the Item, name_ in this example).

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  • How to have a user control as a ListBoxItem

    - by Harry
    I want to bind a user control (View) to a ListBoxItem. The ListBox is bound to a collection of ViewModels. I have set the ListBox's ItemTemplate as so: <ListBox.ItemTemplate> <DataTemplate> <View:ContactView/> </DataTemplate> </ListBox.ItemTemplate> But all I get are blank ListBoxItems. I can click on them, but nothing is showing visually. My ContactView code is very simply: <Border> <DockPanel> <StackPanel DockPanel.Dock="Right" Orientation="Vertical"> <TextBlock Text="{Binding Path=ContactFirstName, FallbackValue=FirstName}" FontWeight="Bold" Margin="5, 0, 5, 0"></TextBlock> <TextBlock Text="{Binding Path=ContactLastName, FallbackValue=LastName}" FontWeight="Bold" Margin="5, 0, 5, 0"></TextBlock> <TextBlock Text="{Binding Path=ContactNumber, FallbackValue=Number}" Margin="5, 0, 5, 0"></TextBlock> </StackPanel> </DockPanel> </Border> What could be wrong with this? Thanks.

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  • Unit Testing: hard dependency MessageBox.Show()

    - by Sean B
    What ways can the SampleConfirmationDialog be unit tested? The SampleConfirmationDialog would be exercised via acceptance tests, however how could we unit test it, seeing as MessageBox is not abstract and no matching interface? public interface IConfirmationDialog { /// <summary> /// Confirms the dialog with the user /// </summary> /// <returns>True if confirmed, false if not, null if cancelled</returns> bool? Confirm(); } /// <summary> /// Implementation of a confirmation dialog /// </summary> public class SampleConfirmationDialog : IConfirmationDialog { /// <summary> /// Confirms the dialog with the user /// </summary> /// <returns>True if confirmed, false if not, null if cancelled</returns> public bool? Confirm() { return MessageBox.Show("do operation x?", "title", MessageBoxButton.YesNo, MessageBoxImage.Question) == MessageBoxResult.Yes; } }

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  • How can data templates in generic.xaml get applied automatically?

    - by Thiado de Arruda
    I have a custom control that has a ContentPresenter that will have an arbitrary object set as it content. This object does not have any constraint on its type, so I want this control to display its content based on any data templates defined by application or by data templates defined in Generic.xaml. If in a application I define some data template(without a key because I want it to be applied automatically to objects of that type) and I use the custom control bound to an object of that type, the data template gets applied automatically. But I have some data templates defined for some types in the generic.xaml where I define the custom control style, and these templates are not getting applied automatically. Here is the generic.xaml : If I set an object of type 'PredefinedType' as the content in the contentpresenter, the data template does not get applied. However, If it works if I define the data template in the app.xaml for the application thats using the custom control. Does someone got a clue? I really cant assume that the user of the control will define this data template, so I need some way to tie it up with the custom control.

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  • Enable "Current Page" in PrintDialog

    - by mizipzor
    Im using a System.Windows.Controls.PrintDialog to let the user print one or more pages from my application. This is what I currently got: PrintDialog printDialog = new PrintDialog(); printDialog.PageRangeSelection = PageRangeSelection.AllPages; printDialog.UserPageRangeEnabled = true; if (printDialog.ShowDialog() == true) { // do print ... } Im looking for the option to enable the Current Page radio button in the dialog. How to enable it?

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  • What is the easiest way to generate a Valid x:Name?

    - by just in case
    I am generating some Xaml based on some other source of input. In some cases I am generating x:Name values but they have invalid characters. I found this article on MSDN: XamlName Grammar Which describes the grammar of a x:Name tag but doesn't tell me how to actually apply this. Clearly there is some code to validate this name at runtime but what is the easiest way to actually fix up a string with invalid characters?

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  • How to get the text with in the datatemplate?

    - by rakish
    I have used below code <DataTemplate x:Key="myTemplate"> <TextBlock Text="Hi"></TextBlock> </DataTemplate> in this case i can able to get the textblock text by using below code DataTemplate myTemplate = this.Resources["myTemplate"] as DataTemplate; TextBlock rootElement = myTemplate.LoadContent() as TextBlock; //I can get the text "rootElement.text " but when i use binding means i cant able to get the text <DataTemplate x:Key="myTemplate"> <TextBlock Text="{Binding EmployeeName}"></TextBlock> </DataTemplate>

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  • How to remove the shadow from a librarystack

    - by red-X
    I'm currently in a project where I need a LibraryStack with no visuals at all, so it would just show the content. If I just remove the background a shadow stays in view which I cant seem to remove... This code looks like: <s:LibraryStack Background="Transparent"> <s:LibraryStackItem Background="AliceBlue"/> <s:LibraryStackItem Background="Bisque"/> <s:LibraryStackItem Background="Salmon"/> </s:LibraryStack> This stack is just for explaining purposes, the actual stack is added in the code behind in c#. So preferably any answers that would be usefull to add in c#.

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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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  • Setting a DataGrid background color based on the previous row

    - by Zipper
    I'm trying to setup a grid where I do column sorting, but I wanted to do zebra striping, only rather than every other row or every x rows, I want it to be based on the value of cells. i.e. All cells that contain 0 have a blue background, the next value would have a white background, the next value would be blue, etc.... The problem I have is that I can't seem to find where to actually do the setting of the background colors. I'm using a custom sorter and I tried setting it in there after I re-order the list and set the data source, but it appears that when the data source is set, that the rows don't exist yet. I tried using the DataContextChanged, but that event doesn't seem to be firing. Here is what I have now. namespace Foo.Bar { public partial class FooBar { List<Bla> ResultList { get; set; } SolidColorBrush stripeOneColor = new SolidColorBrush(Colors.Gold); SolidColorBrush stripeTwoColor = new SolidColorBrush(Colors.White); //********************************************************************************************* public Consistency() { InitializeComponent(); } //********************************************************************************************* override protected void PopulateTabWithData() { ResultList = GetBlas(); SortAndGroup("Source"); } //********************************************************************************************* private void SortAndGroup(string colName) { IOrderedEnumerable <Bla> ordered = null; switch (colName) { case "Source": case "ID": ordered = ResultList.OrderBy(r => r.Source).ThenBy(r => r.ID); break; case "Name": ordered = ResultList.OrderBy(r => r.Source).ThenBy(r => r.Name); break; case "Message": ordered = ResultList.OrderBy(r => r.Message); break; default: throw new Exception(colName); } ResultList = ordered.ThenBy(r => r.Source).ThenBy(r => r.ID).ToList(); // tie-breakers consistencyDataGrid.ItemsSource = null; consistencyDataGrid.ItemsSource = ResultList; ColorRows(); } //********************************************************************************************* private void consistencyDataGrid_Sorting(object sender, System.Windows.Controls.DataGridSortingEventArgs e) { SortAndGroup(e.Column.Header.ToString()); e.Handled = true; } private void ColorRows() { for (var i = 0; i < ResultList.Count; i++) { var currentItem = ResultList[i]; var row = myDataGrid.ItemContainerGenerator.ContainerFromItem(currentItem) as DataGridRow; if (row == null) { continue; } if (i > 0) { var previousItem = ResultList[i - 1]; var previousRow = myDataGrid.ItemContainerGenerator.ContainerFromItem(previousItem) as DataGridRow; if (currentItem.Source == previousItem.Source) { row.Background = previousRow.Background; } else { if (previousRow.Background == stripeOneColor) { row.Background = stripeTwoColor; } else { row.Background = stripeOneColor; } } } else { row.Background = stripeOneColor; } } } } } }

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  • Setting Image.Source doesn't update when loading from a resource.

    - by ChrisF
    I've got this definition in my XAML: <Image Name="AlbumArt" Source="/AlbumChooser2;component/Resources/help.png" /> The image is display OK on startup. In my code I'm looking for mp3's to play and I display the associated album art in this Image. Now if there's no associated image I want to display a "no image" image. So I've got one defined and I load it using: BitmapImage noImage = new BitmapImage( new Uri("/AlbumChooser2;component/Resources/no_image.png", UriKind.Relative)); I've got a helper class that finds the image if there is one (returning it as a BitmapImage), or returns null if there isn't one: if (findImage.Image != null) { this.AlbumArt.Source = findImage.Image; // This works } else { this.AlbumArt.Source = noImage; // This doesn't work } In the case where an image is found the source is updated and the album art gets displayed. In the case where an image isn't found I don't get anything displayed - just a blank. I don't think that it's the setting of AlbumArt.Source that's wrong, but the loading of the BitmapImage. If I use a different image it works, but if I recreate the image it doesn't work. What could be wrong with the image?

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  • PropertyChanged Event of ObservableCollection

    - by developer
    Hi All, I have a observable collection of viewmodel objects. How can I subscribe to the Property Changed event of each view model in my collection as they are created and track which ones have been changed, so that I can updated them to my database. List<DomainObject> objectsToSave = new List<DomainObject>(); foreach (Test val in dirtyObjs) { objectsToSave.AddRange(val.GetObjectsToSave()); } //DB changes bool saveSucceeded = DataServices.SaveMultiple(objectsToSave);

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  • WFP Validation & IDataErrorInfo

    - by Jefim
    A note - the classes I have are EntityObject classes! I have the following class: public class Foo { public Bar Bar { get; set; } } public class Bar : IDataErrorInfo { public string Name { get; set; } #region IDataErrorInfo Members string IDataErrorInfo.Error { get { return null; } } string IDataErrorInfo.this[string columnName] { get { if (columnName == "Name") { return "Hello error!"; } Console.WriteLine("Validate: " + columnName); return null; } } #endregion } XAML goes as follows: <StackPanel Orientation="Horizontal" DataContext="{Binding Foo.Bar}"> <TextBox Text="{Binding Path=Name, ValidatesOnDataErrors=true}"/> </StackPanel> I put a breakpoint and a Console.Writeline on the validation there - I get no breaks. The validation is not executed. Can anybody just press me against the place where my error lies?

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  • What do you name the "other" kind of view-model in an MVVM project?

    - by DanM
    With MVVM, I think of a view-model as a class that provides all the data and commands that a view needs to bind to. But what happens when I have a database entity object, say a Customer, and I want to build a class that shapes or flattens the Customer class for use in a data grid. For example, maybe this special Customer object would have a property TotalOrders, which is actually calculated using a join with a collection of Order entities. My question is, what do I call this special Customer class? In other situations, I'd be tempted to call it a CustomerViewModel, but I feel like "overloading" the notion of a view-model like this would be confusing in an MVVM project. What would you suggest?

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  • Setting a property in XAML for a User Control

    - by Ben
    Hi, I have a user control that has a property of type Integer, that i am trying to set in the XAML Template to be that of a property within the bindingsource. If I set the property using a hard coded integer i.e. <MyControl MyIntegerProperty="3" /> This works fine, but if i try <MyControl MyIntegerProperty="{Binding MyDataContextIntegerProperty}" /> it fails. I know that the integer property on MyDataContext is returning a valid integer, and i know that this format works, as directly above this in the template, i have the line <TextBlock Text="{Binding MyDataContextStringProperty}" /> which works correctly. Is there any flag that i need to set on my User Controls Integer property to allow this to work? Or am i doing something else wrong? Thanks

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  • ScaleTransform and CenterX

    - by Vasco Correia
    I have the following code <Canvas Width="800" Height="600"> ... In the UserControl I animate the ScaleTranform to 1. I want UserControl to "grow" from its center, but it "grows" from the upper left corner of it. The values in CenterX and CenterY do nothing. How can I make it Scale as I want? Thanks in advance.

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  • MVVM Binding To Property == Null

    - by LnDCobra
    I want to show some elements when a property is not null. What is the best way of achieving this? The following is my ViewModel: class ViewModel : ViewModelBase { public Trade Trade { get { return _trade; } set { SetField(ref _trade, value, () => Trade); } } private Trade _trade; } ViewModelBase inherits INotifyPropertyChanged and contains SetField() The Following is the Trade class: public class Trade : INotifyPropertyChaged { public virtual Company Company { get { return _company; } set { SetField(ref _company, value, () => Company); } } private Company _company; ...... } This is part of my View.xaml <GroupBox Visibility="{Binding Path=Trade.Company, Converter={StaticResource boolToVisConverter}}" /> I would like this groupbox to show only if Trade.Company is not null (so when a user selects a company). Would I need to create a custom converter to check for null and return the correct visibility or is there one in .NET?

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  • Microsoft Surface: "Read" the tag value of an IdentityTag

    - by sofri
    Hi, is it possible to read the value of an IdentityTag if you place it on the TagVisualizer, without having initalized it before? I would like to use the tags for registering a new object on the Surface but having all the "free" IdentityTags in a Collection for initalizing them all... There must be a better way to do in I think. But the TagVisualizer doesn't seem to do anything when you put a tag on it that it doesn't know.

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  • Textblock doesnt get updated when rendered in memory?

    - by veechi
    I have a text block which as part of a custom control.I added the custom control as a child of grid which in turn is added as child of a Canvas.All of these contorl are instantiated in memory and are not rendered on the UI.When I update the value of the TextBlock and emboss the canvas on an image, the updated value doesnt appear on the embossed image.Here is the code snippet:- System.Windows.Controls.Canvas embossCanvas = new System.Windows.Controls.Canvas(); System.Windows.Controls.Grid grid = new Grid(); MyControl myctrl= new MyControl(); int wd = (int)myctrl.ActualWidth; int ht = (int)myctrl.ActualHeight; embossCanvas.Width = wd; embossCanvas.Height = ht; grid.Children.Add(myctrl); embossCanvas.Children.Add(grid); myctrl.txtBlk.UpdateLayout(); grid.UpdateLayout(); embossCanvas.Measure(new System.Windows.Size(embossCanvas.Width, embossCanvas.Height)); embossCanvas.Arrange(new System.Windows.Rect(0, 0, embossCanvas.Width, (int)embossCanvas.Height)); embossCanvas.UpdateLayout(); RenderTargetBitmap renderBmp = new RenderTargetBitmap(wd, ht, 96, 96, System.Windows.Media.PixelFormats.Default); renderBmp.Render(embossCanvas);

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  • problem loading resource from class library

    - by mishal153
    I have a class library (mylibrary) which has a resource called "close.png". I used redGate reflector to confirm that the resource is actually present in the dll. Now i use mylibrary.dll in a project where i attempt to extract this "close.png" resource like this : BitmapImage crossImage = new BitmapImage(); crossImage.BeginInit(); crossImage.UriSource = new Uri(@"/mylibrary;component/Resources/close.png", UriKind.RelativeOrAbsolute); crossImage.EndInit(); This BitmapImage crossImage is then used like : Button closeButton = new Button() { Content = new System.Windows.Controls.Image() { Source = crossImage }, MaxWidth = 20, MaxHeight = 20 }; On doing this i get no exceptions being thrown but the button shows no image. Also, i do see some exception info if i investigate the button's 'content' in the debugger.

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  • A new MEF error I've not seen before -- "The export is not assignable to type..."

    - by Dave
    I was very surprised to get this error today, as it's one that I've never encountered before. Everything in the code looked okay, so I did some searches. The previous questions and their respective answers didn't help. This one was solved when the poster made sure his assembly references were consistent. I don't have this issue right now because I'm currently referencing another project in my solution. This one was solved when the poster was instructed to use ImportMany, but I am already using it (I think properly, too) to try to load multiple plugins This one was solved when the poster realized that there was a platform target mismatch. I've already gone through my projects to ensure that everything targets x86. So here's what I am trying to do. I have a plugin that owns a connection to a device. I might also need to be able to share that connection with another plugin. I decided that the cleanest way to do this was to create an interface that would allow the slave plugin to request its own connection to the device. Let's just call it IConnectionSharer. If the slave plugin does not need to borrow this connection and has its own, then it should use its own implementation of IConnectionSharer to connect to the device. My "master" plugin (the one that owns the connection to the device) implements IConnectionSharer. It also exports this via ExportAttribute. My "slave" plugin assembly defines a class that also implements and exports IConnectionSharer. When the application loads, the intent is for my slave plugin, via MEF, to enumerate all IConnectionSharers and store them in an IEnumerable<IConnectionSharer>. It does so like this: [ImportMany] public IEnumerable<IConnectionSharer> AllSharedConnections { get; set; } But during part composition, I get the error the export 'Company.MasterPlugin (ContractName="IConnectionSharer")' is not assignable to type 'IConnectionSharer'. The error message itself seems clear enough -- it's as if MEF thinks my master plugin doesn't inherit from IConnectionSharer... but it does! Can anyone suggest further debugging strategies? I'm going to start the painful process of single stepping through the MEF source.

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