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  • How can I bind another DependencyProperty to the IsChecked Property of a CheckBox?

    - by speedmetal
    Here's an example of what I'm trying to accomplish: <Window x:Class="CheckBoxBinding.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <StackPanel> <CheckBox Name="myCheckBox">this</CheckBox> <Grid> <Grid.Resources> <Style TargetType="ListBox"> <Style.Triggers> <Trigger Property="{Binding ElementName=myCheckBox, Path=IsChecked}" Value="True"> <Setter Property="Background" Value="Red" /> </Trigger> </Style.Triggers> </Style> </Grid.Resources> <ListBox> <ListBoxItem>item</ListBoxItem> <ListBoxItem>another</ListBoxItem> </ListBox> </Grid> </StackPanel> </Window> When I try to run it, I get this XamlParseException: A 'Binding' cannot be set on the 'Property' property of type 'Trigger'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject. So how can I bind a property on the ListBox to the IsChecked property of a CheckBox?

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  • How do I test if a property exists on a object before reading its value?

    - by Jeremy Rudd
    I'm attempting to read a property on a series of Sprites. This property may or may not be present on these objects, and may not even be declared, worse than being null. My code is: if (child["readable"] == true){ // this Sprite is activated for reading } And so Flash shows me: Error #1069: Property selectable not found on flash.display.Sprite and there is no default value. Is there a way to test if a property exists before reading its value? Something like: if (child.isProperty("readable") && child["readable"] == true){ // this Sprite is activated for reading }

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  • WPF custom DependencyProperty notify changes

    - by morsanu
    Hey guys I have a class called MyComponent and it has a DependencyProperty caled BackgroundProperty. public class MyComponent { public MyBackground Background { get { return (MyBackground)GetValue(BackgroundProperty); } set { SetValue(BackgroundProperty, value); } } public static readonly DependencyProperty BackgroundProperty = DependencyProperty.Register("Background", typeof(MyBackground), typeof(MyComponent), new FrameworkPropertyMetadata(default(MyBackground), new PropertyChangedCallback(OnPropertyChanged))); } MyBackground is a class that derives from DependencyObject and it has some DependencyProperties. public class MyBackground : DependencyObject { public Color BaseColor { set { SetValue(BaseColorProperty, value); } get { return (Color)GetValue(BaseColorProperty); } } public static readonly DependencyProperty BaseColorProperty = DependencyProperty.Register("BaseColor", typeof(Color), typeof(MyBackground ), new UIPropertyMetadata(Colors.White)); [...] } Now, what I want is when a property from MyBackground is changed, MyComponent to be notified that MyBackground has changed and the PropertyChangedCallback named OnPropertyChanged to be called.

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  • How can I load a property lazily in JDO (on Google App Engine)?

    - by luciano
    I have this code in one of my @PersistenceCapable classes: @Persistent private Blob data; The Blob can be quite big, so I'd like to load it lazily since most of the times I don't need it. How can I annotate that property to avoid immediate loading? I could create another class that contains the Blob alone and then use a lazy one-to-one, but I'd like to solve this with annotations.

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  • Getting 'this' pointer inside dependency property changed callback

    - by mizipzor
    I have the following dependency property inside a class: class FooHolder { public static DependencyProperty CurrentFooProperty = DependencyProperty.Register( "CurrentFoo", typeof(Foo), typeof(FooHandler), new PropertyMetadata(OnCurrentFooChanged)); private static void OnCurrentFooChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { FooHolder holder = (FooHolder) d.Property.Owner; // <- something like this // do stuff with holder } } I need to be able to retrieve a reference to the class instance in which the changed property belongs. This is since FooHolder has some event handlers that needs to be hooked/unhooked when the value of the property is changed. The property changed callback must be static, but the event handler is not.

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  • c# Reflection - Find the Generic Type of a Collection

    - by Andy Clarke
    Hi, I'm reflecting a property 'Blah' its Type is ICollection public ICollection<string> Blah { get; set; } private void button1_Click(object sender, RoutedEventArgs e) { var pi = GetType().GetProperty("Blah"); MessageBox.Show(pi.PropertyType.ToString()); } This gives me (as you'd expect!) ICollection<string> ... But really I want to get the collection type i.e. ICollection (rather than ICollection<string>) - does anyone know how i'd do this please?

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  • In Javascript, by what mechanism does setting an Image src property trigger an image load?

    - by brainjam
    One of the things you learn early on when manipulating a DOM using Javascript is the following pattern: var img = new Image(); // Create new Image object img.onload = function(){ // execute drawImage statements here } img.src = 'myImage.png'; // Set source path As far as I know, in general when you set an object property there are no side effects. So what is the mechanism for triggering an image load? Is it just magic? Or can I use a similar mechanism to implement a class Foo that supports a parallel pattern? var foo = new Foo(); // Create new object foo.barchanged = function(){ // execute something after side effect has completed } foo.bar = 'whatever'; // Assign something to 'bar' property I'm vaguely aware of Javascript getters and setters. Is this how Image.src triggers a load?

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  • WPF - How do I use the UserControl with a dependency property and view model?

    - by user320849
    Hello, My goal is to have a user select a year and a month. Translate the selection into a date and have the user control send the date back to my view model. That part works for me....However, I cannot get the ViewModel's initial date to set those drop downs. public static readonly DependencyProperty Date = DependencyProperty.Register("ReturnDate", typeof(DateTime), typeof(DatePicker), new FrameworkPropertyMetadata{BindsTwoWayByDefault = true,}); public DateTime ReturnDate { get { return Convert.ToDateTime(GetValue(Date)); } set { SetDropDowns(value); SetValue(Date, value); } } The SetDropDowns(value) just sets the selected items on the combo boxes, however, the program never makes it to that method. On the view I am using: <cc1:DatePicker ReturnDate="{Binding Path=StartDate, Mode=TwoWay}" IsStart="True" /> If this has been answered, then my bad. I looked around and didn't see anything that worked for me. Thus, when the program loads how do I get the value from the view model to a method in order to set the combo boxes? Thanks, -Scott

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  • Use of type 'id' in cocoa class

    - by gotye
    Hey guys, I want to implement a class which can be used by two classes of my project. One is manipulating 'NewsRecord' objects. One is manipulating 'GalleriesRecord' objects. In another class, I may use one of the two objects so i do something like that : // header class id myNewsRecordOrGalleriesRecord; // class.m // NewsRecord and GalleriesRecord have both the title property NSLog(myNewsRecordOrGalleriesRecord.title); and i get : error : request for member 'title' in something not a structure or union any ideas :D ? Thanks. Gotye How am I supposed to do it ?

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  • Ambiguous scénario for iPhone memory management

    - by gotye
    Hey guys, i have some difficulties to understand this scénario ... i create an object i set its retained property to something i Forget to release its property i release the object as i didn't release the property in the dealloc method, Will the scénario result in a memory leak or Will the property be released automatically ? And yes, i read the memory management guide ;) cheers, gotye.

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  • dynamic class property $$value in php

    - by cellis
    How can i reference a class property knowing only a string? class Foo { public $bar; public function TestFoobar() { $this->foobar('bar'); } public function foobar($string) { echo $this->$$string; //doesn't work } } what is the correct way to eval the string?

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  • How can I bind to a helper property in Silverlight

    - by Matt
    For the sake of argument, here's a simple person class public class Person : DependencyObject, INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; public static readonly DependencyProperty FirstNameProperty = DependencyProperty.Register( "FirstName", typeof ( string ), typeof ( Person ), null ); public static readonly DependencyProperty LastNameProperty = DependencyProperty.Register( "LastName", typeof( string ), typeof( Person ), null ); public string FirstName { get { return ( string ) GetValue( FirstNameProperty ); } set { SetValue( FirstNameProperty, value ); if(PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs( "FirstName" )); } } public string LastName { get { return ( string ) GetValue( LastNameProperty ); } set { SetValue( LastNameProperty, value ); if ( PropertyChanged != null ) PropertyChanged( this, new PropertyChangedEventArgs( "LastName" ) ); } } } I want to go about creating a readonly property like this public string FullName { get { return FirstName + " " + LastName; } } How does binding work in this scenario? I've tried adding a DependancyProperty and raised the PropertyChanged event for the fullname. Basically I just want to have a property that I can bind to that returns the fullname of a user whenever the first or last name changes. Here's the final class I'm using with the modifications. public class Person : DependencyObject, INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; public static readonly DependencyProperty FirstNameProperty = DependencyProperty.Register( "FirstName", typeof ( string ), typeof ( Person ), null ); public static readonly DependencyProperty LastNameProperty = DependencyProperty.Register( "LastName", typeof( string ), typeof( Person ), null ); public static readonly DependencyProperty FullNameProperty = DependencyProperty.Register( "FullName", typeof( string ), typeof( Person ), null ); public string FirstName { get { return ( string ) GetValue( FirstNameProperty ); } set { SetValue( FirstNameProperty, value ); if ( PropertyChanged != null ) { PropertyChanged( this, new PropertyChangedEventArgs( "FirstName" ) ); PropertyChanged( this, new PropertyChangedEventArgs( "FullName" ) ); } } } public string LastName { get { return ( string ) GetValue( LastNameProperty ); } set { SetValue( LastNameProperty, value ); if ( PropertyChanged != null ) { PropertyChanged( this, new PropertyChangedEventArgs( "LastName" ) ); PropertyChanged( this, new PropertyChangedEventArgs( "FullName" ) ); } } } public string FullName { get { return GetValue( FirstNameProperty ) + " " + GetValue( LastNameProperty ); } } }

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  • Custom XAML property

    - by Scott Silvi
    Hey all - I've seen a library that allows me to do this inside my XAML, which sets the visibility of the control based on whether or not the user is in a role: s:Authorization.RequiresRole="Admin" Using that library with my database requires a bunch of coding that I can't really do right now. Ultimately here's what I want to know... I have received the authenticated users role from my SPROC, and its currently stored in my App.xaml.cs as a property (not necessary for the final solution, just FYI for now). I want to create a property (dependency property? attached property?) that allows me to say something very similar to what the other library has: RequiresRole="Admin", which would collapse the visibility if the user is not in the Admin role. Can anyone point me in the right direction on this? Thanks, Scott

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  • C# function called after dependency property have been set

    - by mizipzor
    My code currently looks like this: private Foo myFoo; public Foo CurrentFoo { get { return myFoo; } set { SetFoo(value); } } private void SetFoo(Foo newFoo) { // Do stuff // Here be dragons myFoo = newFoo; } To be able to bind it in XAML/WPF I need to turn Foo into a dependency property: public static DependencyProperty CurrentFooProperty = DependencyProperty.Register("CurrentFoo", typeof(Foo), typeof(FooHandler), new PropertyMetadata(false)); public Foo CurrentFoo { get { return (Foo)GetValue(CurrentFooProperty); } set { SetValue(CurrentFooProperty, value); } } Ive heard that you shouldnt do magic inside the actual C# property set {}, since it might not be called but the value is written directly to the dependency property. If this is false, let me know, it seems like the most obvious and simple route to take. I know I can add a validation function to the dependency property but I assume that it shouldnt be used for this? I need to communicate the change to legacy systems that cannot yet be bound in XAML. Whats the best way to approach this problem?

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  • How to use java property files?

    - by Click Upvote
    So I have a list of key/value pairs of configuration values I want to store as java property files, and later load and iterate through. Questions: Do I need to store the file in the same package as the class which will load them, or is there any specific location where it should be placed? Does the file need to end in any specific extension or is .txt ok? How can I load the file in the code And how can I iterate through the values inside?

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  • .NET DefaultValue attribute

    - by Aaron
    I've heard people say a few different things about the DefaultValue attribute including: "It sets the value of the property before anything else uses it." "It doesn't work for autoproperties." "It's only for decoration. You must manually set actual default values." Which (if any) is right? Does DefaultValue actually set default values? Are there cases where it doesn't work? Is it best just not to use it?

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  • javascript object access performance

    - by youdontmeanmuch
    In Javascript, when your getting a property of an object, is there a performance penalty to getting the whole object vs only getting a property of that object? Also Keep in mind I'm not talking about DOM access these are pure simple Javascript objects. For example: Is there some kind of performance difference between the following code: Assumed to be faster but not sure: var length = some.object[key].length; if(length === condition){ // Do something that doesnt need anything inside of some.object[key] } else{ var object = some.object[key]; // Do something that requires stuff inside of some.object[key] } I think this would be slower but not sure if it matters. var object = some.object[key]; if(object.length === condition){ // Do something that doesnt need anything inside of some.object[key] } else{ // Do something that requires stuff inside of some.object[key] }

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  • Adding and altering multiple text items to a Canvas -- what approach?

    - by philologon
    I am attempting to use a Canvas to create a simple Cad application. I have been able to get lines to draw as I want. For now the only other thing I need is text. The user should be able to edit the text in place. ?Is one of these better to use for this over the others? Rich Text TextBlock TextBox Label A more important question, though, is once I have chosen which class to use for implementation, how do I set and get the text value in code? Since the app is in essence a cad application, text will be added, deleted, and altered often, so I am not attempting to put these in XAML, but code-behind. That is why I am asking about how to do this in code. If the answer is "use X.SetValue()" (or that family of methods), then please tell me what I am supposed to do with the required DependencyProperty reference? TIA. Paul

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  • @property setter for BOOL.

    - by George
    Hi, I'm having problems setting a BOOL using @property and @synthesize. I'm using @property BOOL isPaused; And I can get it by using [myObject isPaused]; but I cannot manage to set it. I'd like to use [myObject setPaused: NO];. I also tried @property (setter=setPaused) BOOL isPaused; but if I'm not mistaking, then I need to write that setter myself.

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  • How to make a private property?

    - by mystify
    I tried to make a private property in my *.m file: @interface MyClass (Private) @property (nonatomic, retain) NSMutableArray *stuff; @end @implementation MyClass @synthesize stuff; // not ok Compiler claims that there's no stuff property declared. But there's a stuff. Just in an anonymous category. Let me guess: Impossible. Other solutions?

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  • representing an XML config file with an IXmlSerializable class

    - by Sarah Vessels
    I'm writing in C# and trying to represent an XML config file through an IXmlSerializable class. I'm unsure how to represent the nested elements in my config file, though, such as logLevel: <?xml version="1.0" encoding="utf-8" ?> <configuration> <logging> <logLevel>Error</logLevel> </logging> <credentials> <user>user123</user> <host>localhost</host> <password>pass123</password> </credentials> <credentials> <user>user456</user> <host>my.other.domain.com</host> <password>pass456</password> </credentials> </configuration> There is an enum called LogLevel that represents all the possible values for the logLevel tag. The tags within credentials should all come out as strings. In my class, called DLLConfigFile, I had the following: [XmlElement(ElementName="logLevel", DataType="LogLevel")] public LogLevel LogLevel; However, this isn't going to work because <logLevel> isn't within the root node of the XML file, it's one node deeper in <logging>. How do I go about doing this? As for the <credentials> nodes, my guess is I will need a second class, say CredentialsSection, and have a property such as the following: [XmlElement(ElementName="credentials", DataType="CredentialsSection")] public CredentialsSection[] AllCredentials; Edit: okay, I tried Robert Love's suggestion and created a LoggingSection class. However, my test fails: var xs = new XmlSerializer(typeof(DLLConfigFile)); using (var stream = new FileStream(_configPath, FileMode.Open, FileAccess.Read, FileShare.Read)) { using (var streamReader = new StreamReader(stream)) { XmlReader reader = new XmlTextReader(streamReader); var file = (DLLConfigFile)xs.Deserialize(reader); Assert.IsNotNull(file); LoggingSection logging = file.Logging; Assert.IsNotNull(logging); // fails here LogLevel logLevel = logging.LogLevel; Assert.IsNotNull(logLevel); Assert.AreEqual(EXPECTED_LOG_LEVEL, logLevel); } } The config file I'm testing with definitely has <logging>. Here's what the classes look like: [Serializable] [XmlRoot("logging")] public class LoggingSection : IXmlSerializable { public XmlSchema GetSchema() { return null; } [XmlElement(ElementName="logLevel", DataType="LogLevel")] public LogLevel LogLevel; public void ReadXml(XmlReader reader) { LogLevel = (LogLevel)Enum.Parse(typeof(LogLevel), reader.ReadString()); } public void WriteXml(XmlWriter writer) { writer.WriteString(Enum.GetName(typeof(LogLevel), LogLevel)); } } [Serializable] [XmlRoot("configuration")] public class DLLConfigFile : IXmlSerializable { [XmlElement(ElementName="logging", DataType="LoggingSection")] public LoggingSection Logging; }

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  • How to create an attached-property to change a resource's property?

    - by king.net
    I have a DrawingBrush as a resource like this: <DrawingBrush x:Key="Calendar" Stretch="Uniform"> <DrawingBrush.Drawing> <DrawingGroup> <DrawingGroup.Children> <GeometryDrawing Geometry="F1 M 28.0917,2.13333C 42.4005,2.13333 54,13.7329 54,28.0417C 54,42.3504 42.4004,53.95 28.0917,53.95C 13.7829,53.95 2.18334,42.3504 2.18334,28.0417C 2.18334,13.7329 13.7829,2.13333 28.0917,2.13333 Z "> <GeometryDrawing.Pen> <Pen Thickness="4" LineJoin="Round" Brush="#FF000000"/> </GeometryDrawing.Pen> </GeometryDrawing> <GeometryDrawing Geometry="F1 M 16.9667,16.7083L 39.7167,16.7083L 39.7167,41.625L 16.9667,41.625L 16.9667,16.7083 Z "> <GeometryDrawing.Pen> <Pen Thickness="2.66667" StartLineCap="Square" EndLineCap="Square" MiterLimit="2.75" Brush="#FF000000"/> </GeometryDrawing.Pen> </GeometryDrawing> <GeometryDrawing Brush="#FF000000" Geometry="F1 M 15.6333,15.9583L 40.7167,15.9583L 40.7167,25.2917L 15.6333,25.2917L 15.6333,15.9583 Z "/> <GeometryDrawing Brush="#FFFFFFFF" Geometry="F1 M 18.2167,11.9583L 22.9667,11.9583L 22.9667,20.875L 18.2167,20.875L 18.2167,11.9583 Z "> <GeometryDrawing.Pen> <Pen Thickness="1.33333" StartLineCap="Square" EndLineCap="Square" MiterLimit="2.75" Brush="#FF000000"/> </GeometryDrawing.Pen> </GeometryDrawing> <GeometryDrawing Brush="#FFFFFFFF" Geometry="F1 M 33.7167,11.925L 38.4667,11.925L 38.4667,20.8417L 33.7167,20.8417L 33.7167,11.925 Z "> <GeometryDrawing.Pen> <Pen Thickness="1.33333" StartLineCap="Square" EndLineCap="Square" MiterLimit="2.75" Brush="#FF000000"/> </GeometryDrawing.Pen> </GeometryDrawing> <GeometryDrawing Brush="#FF000000" Geometry="F1 M 28.0154,36.2658L 28.0154,37.4894L 21.6254,37.4894C 21.6169,37.1934 21.6615,36.908 21.7592,36.6333C 21.915,36.1815 22.165,35.7425 22.5091,35.3162C 22.8533,34.8899 23.3617,34.4091 24.0344,33.8738C 25.0782,32.983 25.776,32.295 26.1279,31.81C 26.4799,31.3249 26.6558,30.8551 26.6558,30.4005C 26.6558,29.9473 26.4894,29.5653 26.1566,29.2544C 25.8238,28.9435 25.3904,28.7881 24.8565,28.7881C 24.2915,28.7881 23.8393,28.9442 23.5001,29.2565C 23.161,29.5688 22.9892,30.0018 22.985,30.5556L 21.7614,30.4196C 21.8449,29.5345 22.1576,28.86 22.6993,28.3962C 23.241,27.9323 23.9686,27.7004 24.882,27.7004C 25.8054,27.7004 26.5358,27.9596 27.0733,28.4779C 27.6107,28.9963 27.8795,29.6385 27.8795,30.4047C 27.8795,30.7942 27.8065,31.1769 27.6607,31.5529C 27.5148,31.9289 27.2726,32.3251 26.9341,32.7415C 26.5957,33.1579 26.0115,33.7215 25.1816,34.4325C 24.4692,35.0216 24.0008,35.4214 23.7763,35.6317C 23.5518,35.842 23.3667,36.0533 23.2208,36.2658L 28.0154,36.2658 Z "/> <GeometryDrawing Brush="#FF000000" Geometry="F1 M 33.3178,37.4894L 33.3178,35.1781L 28.9671,35.1781L 28.9671,33.9545L 33.5897,27.8364L 34.5414,27.8364L 34.5414,33.9545L 35.765,33.9545L 35.765,35.1781L 34.5414,35.1781L 34.5414,37.4894L 33.3178,37.4894 Z M 33.3178,33.9545L 33.3178,30.1774L 30.4648,33.9545L 33.3178,33.9545 Z "/> </DrawingGroup.Children> </DrawingGroup> </DrawingBrush.Drawing> </DrawingBrush> And I can use it like this: <Rectangle Fill="{DynamicResource Calender}" /> Now, my question is: how can I create an attached-property to change all brushes on my resource? e.g. I be able to create this: <Rectangle Fill="{DynamicResource Calendar}" attached:IconHelper.Foreground="Blue" /> on my Rectangle and in my resource, I can get: <DrawingBrush x:Key="Calendar" Stretch="Uniform"> <DrawingBrush.Drawing> <DrawingGroup> <DrawingGroup.Children> <GeometryDrawing Geometry="blah blah"> <GeometryDrawing.Pen> <Pen Brush={attached:ReadItFromAboveRectangle}/> </GeometryDrawing.Pen> </GeometryDrawing> <GeometryDrawing Geometry="blah blah"> <GeometryDrawing.Pen> <Pen Brush={attached:ReadItFromAboveRectangle}/> </GeometryDrawing.Pen> <!-- etc... --> Is there any way to read an attached-property on Rectangle in Calendar resource? Or is there any other way to do this? Thanks in advance.

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  • Binding between Usercontrol with listbox and parent control (MVVM)

    - by walkor
    I have a UserControl which contains a listbox and few buttons. <UserControl x:Class="ItemControls.ListBoxControl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"> <Grid> <ListBox:ExtendedListBox SelectionMode="Single" ItemsSource="{Binding LBItems}" Height="184"> <ListBox.ItemTemplate> <DataTemplate> <CheckBox Content="{Binding}"/> </DataTemplate> </ListBox.ItemTemplate> </ListBox> <Button Command="RemoveCommand"/> </Grid> </UserControl> And the code behind: public static readonly DependencyProperty RemoveCommandProperty = DependencyProperty.Register("RemoveCommand", typeof(ICommand), typeof(ListBoxControl), null); public ICommand RemoveCommand { get { return (ICommand)GetValue(RemoveCommandProperty); } set { SetValue(RemoveCommandProperty, value); } } public static readonly DependencyProperty LBItemsProperty = DependencyProperty.Register("LBItems", typeof(IEnumerable), typeof(ListBoxControl), null); public IEnumerable LBItems { get { return (IEnumerable)GetValue(LBItemsProperty); } set { SetValue(LBItemsProperty, value); } } I'm using this control in the view like this: <ItemControls:ListBoxControl Height="240" Width="350" LBItems="{Binding Items, Converter={StaticResource ItemsConverter}, Mode=TwoWay}" RemoveCommand="{Binding RemoveCommand}"/> The command works fine, though the listbox binding doesn't. My question is - WHY?

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