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  • How to force VS to react on a changing of an attached property in design time?

    - by sedovav
    Imagine, we have a wpf class library with a window1.xaml and a resource dictionary res.xaml defined in it. I know how to use styles that defined in the res.xaml for the controls that defined into the window: <Window x:Class="...Window1"> <Window.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="res.xaml"/> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> <\Window.Resources> </Window> So we can use the dictionary's styles for all elements into the window (except the window element... I don't know how to set the style from the res.xaml for the window :( ). I saw the article where describes how to create and use attached property to add resource dictionaries to a FrameworkElement.Resources.MergedDictionaries list. It's good! We can do the same as we done in the example above but we can use the window style now. It looks like this: <Window x:Class="...Window1" xmlns: resources="..." resources:SharedResources.MergedDictionaries="res.xaml"> </Window> That's good but VS2008 cannot recognize resources from res.xaml in design time. So we have a sad situation: all styles from res.xaml are available in run-time but in the design-time VS cannot display the window (it can't find the mentioned styles). Does anybody know how to fix this situation?

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  • Change function into dependencyproperty

    - by Jaya Willianto
    Hi everyone.. I am new to XAML and WPF and I am learning about DependencyProperty and Path. For example, I have a function like this public byte[] DownloadPicture() { WebClient webClient = new WebClient(); byte[] data; data = webClient.DownloadData("https://graph.facebook.com/4/picture&type=large"); return data; } and I have dependencyproperty like this public static DependencyProperty DownloadPicProperty = DependencyProperty.Register("DownloadPic", typeof(byte), typeof(ImageControl), new PropertyMetadata(false)); How can I connect the DependencyProperty with the DownloadPicture function I wrote? Any suggestions? What should I write in the CLR wrapper?

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  • @property objective-c sintax

    - by okami
    I'm looking for the sintax of the getter/setter. Which is the setter and which is the getter?? Is the readwrite attribute the getter? Is the assign the setter? @interface SomeClass : NSObject { NSString *str; NSDate *date; } @property (readwrite, assign) NSString *str; @property (readwrite, assign) NSDate *date;

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  • Dependencyproperty doesn't have value on load

    - by Jakob
    My problem is this, I have a UC called profile that contains another UC called FollowImageControl. In my Profile.xaml i declaretively bind a property of FollowImageControl called FollowerId to a CurrentUserId from Profile.xaml.cs. Problem is that I CurrentUserId is assigned in Profile.xaml.cs; the Profile.xaml code-behind. This means that I do not initially get the FollowerId. I have these methods in the FollowImageControl.xaml.cs: public static readonly DependencyProperty _followUserId = DependencyProperty.Register("FollowUserId", typeof(Guid), typeof(FollowImageControl), null); public Guid FollowUserId { get { return (Guid)GetValue(_followUserId); } set { SetValue(_followUserId, value); } } public FollowImageControl() { // Required to initialize variables InitializeComponent(); LoggedInUserId = WebContext.Current.User.UserId; var ctx = new NotesDomainContext(); if (ctx.IsFollowingUser(LoggedInUserId, FollowUserId).Value) SwitchToDelete.Begin(); } private void AddImg_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { if (LoggedInUserId != FollowUserId) { var ctx = new NotesDomainContext(); ctx.FollowUser(FollowUserId, LoggedInUserId); ctx.SubmitChanges(); } } THE WEIRD THING IS that when i insert breakpoints the FollowerUserId in FollowImageControl() is 0, but it has a value in AddImg_MouseLeftButtonDown, and there is no inbetween logic that sets the value of it. How is this??? Here's a little more code info: This is my binding from profile.xaml <internalCtrl:FollowImageControl FollowUserId="{Binding ElementName=ProfileCtrl, Path=CurrentUserId}" /> this is my constructor in profile.xaml.cs wherein the CurrentUserId is set public static readonly DependencyProperty _CurrentUserId = DependencyProperty.Register("CurrentUserId", typeof(Guid), typeof(Profile), null); public Guid CurrentUserId { get { return (Guid)GetValue(_CurrentUserId); } set { SetValue(_CurrentUserId, value); } } public Profile(Guid UserId) { CurrentUserId = UserId; InitializeComponent(); Loaded += new RoutedEventHandler(Profile_Loaded); } I'm seriously dumbfound that one minute the FollowerId has no value, and the next it holds the right, without me having changed the value in the code-behind.

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  • Binding lineargradientbrush color with property

    - by user1629894
    I have a problem with color in gradientstop. I want binding offset color with my property that return color (System.Windows.Media), but not working and return defalt color Transparent. If binding same property with Foreground Label is working. This style is in ResourceDictionary. <Style TargetType="{x:Type TabControl}"> <Setter Property="Background"> <Setter.Value> <LinearGradientBrush StartPoint="0 0" EndPoint="0 1"> <LinearGradientBrush.GradientStops> <GradientStop Offset="0.1" Color="Black" /> <GradientStop Offset="1" Color="{Binding Path=MyColor}" /> </LinearGradientBrush.GradientStops> </LinearGradientBrush> </Setter.Value> </Setter> </Style> and it's working: <Style TargetType="{x:Type Label}"> <Setter Property="Foreground" Value="{Binding Path=MyColor, Converter={StaticResource ColorToBrush}}" /> </Style> my property is: public Color MyColor { set { myColor = value; NotifyPropertyChanged("MyColor"); } get { return myColor; } } Thank you everybody for answers

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  • How to extract object reference from property access lamda

    - by Jim C
    Here's a follow-up question to http://stackoverflow.com/questions/2820660/get-name-of-property-as-a-string. Given a method Foo (error checking omitted for brevity): // Example usage: Foo(() => SomeClass.SomeProperty) // Example usage: Foo(() => someObject.SomeProperty) void Foo(Expression<Func<T>> propertyLambda) { var me = propertyLambda.Body as MemberExpression; var pi = me.Member as PropertyInfo; bool propertyIsStatic = pi.GetGetMethod().IsStatic; object owner = propertyIsStatic ? me.Member.DeclaringType : ???; ... // Execute property access object value = pi.GetValue(owner, null); } I've got the static property case working but don't know how to get a reference to someObject in the instance property case. Thanks in advance.

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  • how to store data with many categories and many properties efficiently?

    - by Mickey Shine
    We have a large number of data in many categories with many properties, e.g. category 1: Book properties: BookID, BookName, BookType, BookAuthor, BookPrice category 2: Fruit properties: FruitID, FruitName, FruitShape, FruitColor, FruitPrice We have many categories like book and fruit. Obviously we can create many tables for them (MySQL e.g.), and each category a table. But this will have to create too many tables and we have to write many "adapters" to unify manipulating data. The difficulties are: 1) Every category has different properties and this results in a different data structure. 2) The properties of every categoriy may have to be changed at anytime. 3) Hard to manipulate data if each category a table (too many tables) How do you store such kind of data?

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  • AppEngine: Can I write a Dynamic property (db.Expando) with a name chosen at runtime?

    - by MarcoB
    If I have an entity derived from db.Expando I can write Dynamic property by just assigning a value to a new property, e.g. "y" in this example: class MyEntity(db.Expando): x = db.IntegerProperty() my_entity = MyEntity(x=1) my_entity.y = 2 But suppose I have the name of the dynamic property in a variable... how can I (1) read and write to it, and (2) check if the Dynamic variable exists in the entity's instance? e.g. class MyEntity(db.Expando): x = db.IntegerProperty() my_entity = MyEntity(x=1) # choose a var name: var_name = "z" # assign a value to the Dynamic variable whose name is in var_name: my_entity.property_by_name[var_name] = 2 # also, check if such a property esists if my_entity.property_exists(var_name): # read the value of the Dynamic property whose name is in var_name print my_entity.property_by_name[var_name] Thanks...

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  • Get name of maven pom file

    - by dacwe
    I am running a Maven (2) release build with with: mvn -f release.xml clean deploy and want to get the currently running pom file name (release.xml) into a property or mojo. Is it possible?

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  • How to read a Dependency property from a method

    - by PaN1C_Showt1Me
    XAML: <my:Control ItemsSource="{StaticResource MySource}" A="true" /> Assume a Control with a dependency property A with a default value false; and a method to handle the Source Collection: protected override void OnItemsSourceChanged(System.Collections.IEnumerable oldValue, System.Collections.IEnumerable newValue) {} in which you want to look at A and readout its value (which is true). how would you ensure, that A is already initialized and has a given value? Or how should this be done correctly ? In my case A is something like AllowLateBinding .. Could coerce callback help me?

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  • C# - Check which event changed / accessed a Property

    - by binil
    I have a class with property say private string fieldSelectedItem; public string FieldSelectedItem { get { return fieldSelectedItem; } set { fieldSelectedItem = value; } } it is accessed from many place. I came across a situation that the a property in class is accessed by some event. and also some event is changing the value. i tried debugging. is it possible to check which event/function has changed/accessed the property. is there any method to do so.

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  • Class Method not working in objective c

    - by byteSlayer
    In my code I have a class called 'ProfileShareViewController', In which I have imported another class I have created called 'OwnProfileData', And I have also created an Instance of that class (class = OwnProfileData) as a property Of 'ProfileShareViewController' and synthesized it (instance called 'OwnProfile'). In another class I have called 'EditProfileViewController', I have imported the 'ProfileShareViewController', and now I am trying to change a property of the OwnProfile object from the ProfileShareViewController within the EditProfileViewController class. For some reason that doesn't work. I have Tried typing: [[ProfileShareViewController ownProfile] setName:@"Ido"]; (The property I am trying to set is Name, and as it is synthesized in OwnProfileData, I am using 'setName'). This doesn't work and I get the warning: "No known class method for selector 'ownMethod'. Any Idea as for why that might happen and how I can fix this? Thanks for your comments! Any support is highly appreciated!

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  • How can a property resolve its own name and type with reflection?

    - by Tim Santeford
    Is there a way for a property to access its own name and type at runtime using reflection? I want to access this info without hard coding the name or index of the property in the class. Simple Example Code: Private ReadOnly Property MyProperyName() As String Get Console.WriteLine((Get Current Property Info).Type.ToString) Console.WriteLine((Get Current Property Info).Name) Return "" End Get End Property Expected output: System.String MyPropertyName

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  • Delphi static method of a class returning property value

    - by mitko.berbatov
    I'm making a Delphi VCL application. There is a class TStudent where I have two static functions: one which returns last name from an array of TStudent and another one which returns the first name of the student. Their code is something like: class function TStudent.FirstNameOf(aLastName: string): string; var i : integer; begin for i := 0 to Length(studentsArray) - 1 do begin if studentsArray[i].LastName = aLastName then begin result := studentsArray[i].FirstName; Exit; end; end; result := 'no match was found'; end; class function TStudent.LastNameOf(aFirstName: string): string; var i : integer; begin for i := 0 to Length(studentsArray) - 1 do begin if studentsArray[i].FirstName = aFirstName then begin result := studentsArray[i].LastName; Exit; end; end; result := 'no match was found'; end; My question is how can I avoid writing almost same code twice. Is there any way to pass the property as parameter of the functions.

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  • when i set property(retain), one "self" = one "retain"?

    - by Walter
    although I'm about to finish my first app, I'm still confused about the very basic memory management..I've read through many posts here and apple document, but I'm still puzzled.. For example..I'm currently doing things like this to add a label programmatically: @property (retain, nonatomic) UILabel *showTime; @sythesize showTime; showTime = [[UILabel alloc] initWithFrame:CGRectMake(45, 4, 200, 36)]; [self.showTime setText:[NSString stringWithFormat:@"%d", time]]; [self.showTime setFont:[UIFont fontWithName:@"HelveticaRoundedLT-Bold" size:23]]; [self.showTime setTextColor:numColor]; self.showTime.backgroundColor = [UIColor clearColor]; [self addSubview:self.showTime]; [showTime release]; this is my current practice, for UILabel, UIButton, UIImageView, etc... [Alloc init] it without self., coz I know this will retain twice.. but after the allocation, I put back the "self." to set the attributes.. My gut feel tells me I am doing wrong, but it works superficially and I found no memory leak in analyze and instruments.. can anyone give my advice? when I use "self." to set text and set background color, does it retain one automatically? THX so much!

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  • Python "callable" attribute (pseudo-property)

    - by mgilson
    In python, I can alter the state of an instance by directly assigning to attributes, or by making method calls which alter the state of the attributes: foo.thing = 'baz' or: foo.thing('baz') Is there a nice way to create a class which would accept both of the above forms which scales to large numbers of attributes that behave this way? (Shortly, I'll show an example of an implementation that I don't particularly like.) If you're thinking that this is a stupid API, let me know, but perhaps a more concrete example is in order. Say I have a Document class. Document could have an attribute title. However, title may want to have some state as well (font,fontsize,justification,...), but the average user might be happy enough just setting the title to a string and being done with it ... One way to accomplish this would be to: class Title(object): def __init__(self,text,font='times',size=12): self.text = text self.font = font self.size = size def __call__(self,*text,**kwargs): if(text): self.text = text[0] for k,v in kwargs.items(): setattr(self,k,v) def __str__(self): return '<title font={font}, size={size}>{text}</title>'.format(text=self.text,size=self.size,font=self.font) class Document(object): _special_attr = set(['title']) def __setattr__(self,k,v): if k in self._special_attr and hasattr(self,k): getattr(self,k)(v) else: object.__setattr__(self,k,v) def __init__(self,text="",title=""): self.title = Title(title) self.text = text def __str__(self): return str(self.title)+'<body>'+self.text+'</body>' Now I can use this as follows: doc = Document() doc.title = "Hello World" print (str(doc)) doc.title("Goodbye World",font="Helvetica") print (str(doc)) This implementation seems a little messy though (with __special_attr). Maybe that's because this is a messed up API. I'm not sure. Is there a better way to do this? Or did I leave the beaten path a little too far on this one? I realize I could use @property for this as well, but that wouldn't scale well at all if I had more than just one attribute which is to behave this way -- I'd need to write a getter and setter for each, yuck.

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  • Binding one dependency property to another

    - by Gregory Dodd
    I have a custom Tab Control that I have created, but I am having an issue. I have an Editable TextBox as part of the custom TabControl View. <Controls:EditableTextControl x:Name="PageTypeName" Style="{StaticResource ResourceKey={x:Type Controls:EditableTextControl}}" Grid.Row="0" TabIndex="0" Uid="0" AutomationProperties.AutomationId="PageTypeNameTextBox" AutomationProperties.Name="PageTypeName" Visibility="{Binding ElementName=PageTabControl,Path=ShowPageType}"> <Controls:EditableTextControl.ContextMenu> <ContextMenu x:Name="TabContextMenu"> <MenuItem Header="Rename Page Type" Command="{Binding Path=PlacementTarget.EnterEditMode, RelativeSource={RelativeSource AncestorType=ContextMenu}}" AutomationProperties.AutomationId="RenamePageTypeMenuItem" AutomationProperties.Name="RenamePageType"/> <MenuItem Header="Delete Page Type" Command="{Binding Path=PageTypeDeletedCommand}" AutomationProperties.AutomationId="DeletePageTypeMenuItem" AutomationProperties.Name="DeletePageType"/> </ContextMenu> </Controls:EditableTextControl.ContextMenu> <Controls:EditableTextControl.Content> <!--<Binding Path="CurrentPageTypeViewModel.Name" Mode="TwoWay"/>--> <Binding ElementName="PageTabControl" Path="CurrentPageTypeName" Mode ="TwoWay"/> </Controls:EditableTextControl.Content> </Controls:EditableTextControl> In the Content section I am binding to a Dependency Prop called CurrentPageTypeName. This Depedency prop is part of this custom Tab Control. public static DependencyProperty CurrentPageTypeNameProperty = DependencyProperty.Register("CurrentPageTypeName", typeof(object), typeof(TabControlView)); public object CurrentPageTypeName { get { return GetValue(CurrentPageTypeNameProperty) as object; } set { SetValue(CurrentPageTypeNameProperty, value); } } In another view, where I am using the custom TabControl I then bind my property, with the actual name value, to CurrentPageTypeName property as seen below: <Views:TabControlView Grid.Row="0" Name="RunPageTabControl" TabItemsSource="{Binding RunPageTypeViewModels}" SelectedTab="{Binding Converter={StaticResource debugConverter}}" CurrentPageTypeName="{Binding Path=RunPageName, Mode=TwoWay}" TabContentTemplateSelector="{StaticResource tabItemTemplateSelector}" SelectedIndex="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.SelectedTabIndex}" ShowPageType="Hidden" > <!--<Views:TabControlView.TabContentTemplate> <DataTemplate DataType="{x:Type ViewModels:RunPageTypeViewModel}"> <RunViews:RunPageTypeView/> </DataTemplate> </Views:TabControlView.TabContentTemplate>--> </Views:TabControlView> My problem is that nothing seems to be happening. It is grabbing its Content from the Itemsource, and not from my chained Dependency props. Is what I am trying even possible? If so, what have I done wrong. Thanks for looking.

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  • readonly property setter

    - by Anonymous Coward
    Hi Everyone After a extensive debugging session I found that the problem was that I called the setter of a readonly property. Is there a trick to provoke a compiler warning when this happens? Because marking the setter private does not work. Cheers, CA

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  • ASP.NET UserControl Uri property

    - by Roedel
    I want to pass a property of the type System.Uri to an WebControl from inside an aspx page. Is it possible to pass the property like that: <MyUserControl id="myusercontrol" runat="server"> <MyUrlProperty> <System.Uri>http://myurl.com/</System.Uri> </MyUrlProperty> </MyUserControl> instead of: <MyUserControl id="myusercontrol" runat="server" MyUrlProperty="http://myurl.com/" /> which can't be casted from System.String to System.Uri

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  • Why does set key not do anything in AES/SymmetricAlgorithm?

    - by acidzombie24
    This MESSED ME UP hard. I thought i was setting the key but i was not. No exceptions, nothing happen except bad results. Why is there a setter if everything is ignored and no exceptions are thrown when i attempt to write? What is the point of the setter on the Keys property? When i do the below Key value are not changed. After an hour when i realize what was happening i wrote the loop to verify. I also tried aes.Key[0] = val; var b = val == aes.Key[0]; (and messed with it in immediate mode). Why does it have this behavior? Array.Copy(myKey, aes.Key, aes.Key.Length); int i = 0; foreach (var v in aes.Key) { var b = myKey[i++] == v; if (!b) b = b; }

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  • How do I make an object a property of a model in Ruby on Rails?

    - by iTake
    I have this in my schema: create_table "robots_matches", :force => true do |t| t.integer "robot_id" t.integer "match_id" and I think I want to be able to load a robot and match from within my robots_match model so I can do something like this: robots_match.find(:id).get_robot().Name My attempt in the robots_matches model was this: def get_robot Robot.find(this.id) end I am super new to rails, so feel free to correct my architectural decision here.

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  • Resolve property at runtime. C#

    - by user1031381
    I have some class which have some code public IEnumerable<TypeOne> TypeOne { get { if (db != null) { var col = db.Select<TypeOne>(); if (col.Count > 0) return col; } return db2.TypeOne; } } public IEnumerable<TypeTwo> TypeTwo { get { if (db != null) { var col = db.Select<TypeTwo>(); if (col.Count > 0) return col; } return db2.TypeTwo; } } So as You can see there is a lot of duplicated Code and there are same property name and item type of enumerable. I want to call some property of object like "obj.MyProp". And MyProp must be resolved at runtime with some generic or non-generic method. Is it possible?

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  • Is read-only auto-imlemented property possible?

    - by abatishchev
    Hello. I found a topic on MSDN that talks that yes, this is possible. I did a test that seems to break this statement: using System; namespace Test { class Program { static void Main(string[] args) { Foo f = new Foo("1"); Console.WriteLine(f.Bar); // prints 1 f.Test("2"); Console.WriteLine(f.Bar);// successfully prints 2 } } class Foo { public Foo(string b) { this.Bar = b; } public string Bar { get; private set; } public void Test(string b) { // this would be impossible for readonly field! // next error would be occur: CS0191 or CS0191 // A readonly field cannot be assigned to (except in a constructor or a variable initializer) this.Bar = b; } } } Where am I wrong?

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  • Nested property class

    - by user998405
    I got 1 parent property class and 3 child property class. Here is my example Parent class public class blcSalesParam { public string selectFrom { get; set; } public string pageAction { get; set; } } Child class public class blcDeliveryOrder { public int? DeliveryID { get; set; } public string DeliveryCode { get; set; }

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