Questions tagged [dependency-properties]
A property in WPF and Silverlight that can be set through methods such as, styling, data binding, animation, and inheritance.
dependency-properties
2,314
questions
379
votes
14
answers
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views
INotifyPropertyChanged vs. DependencyProperty in ViewModel
When implementing the ViewModel in a Model-View-ViewModel architecture WPF application there seem to be two major choices how to make it databindable. I have seen implementations that use ...
- 49.3k
143
votes
3
answers
64k
views
What is a dependency property?
What is a dependency property in .Net (especially in WPF context). What is the difference from the regular property?
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101
votes
5
answers
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views
What's the difference between a dependency property and an attached property in WPF?
What's the difference between a (custom) dependency property and an attached property in WPF? What are the uses for each? How do the implementations typically differ?
- 29k
86
votes
6
answers
63k
views
Listen to changes of dependency property
Is there any way to listen to changes of a DependencyProperty? I want to be notified and perform some actions when the value changes but I cannot use binding. It is a DependencyProperty of another ...
- 17.6k
79
votes
2
answers
33k
views
How do You Create a Read-Only Dependency Property?
How do you create a read-only dependancy property? What are the best-practices for doing so?
Specifically, what's stumping me the most is the fact that there's no implementation of
...
- 21.1k
72
votes
2
answers
23k
views
Is there a way to specify a custom dependency property's default binding mode and update trigger?
I would like to make it so that, as default, when I bind to one of my dependency properties the binding mode is two-way and update-trigger is property changed. Is there a way to do this?
Here is an ...
- 2,459
69
votes
7
answers
84k
views
A 'Binding' can only be set on a DependencyProperty of a DependencyObject
From a custom control based on TextBox, I created a property named Items, in this way:
public class NewTextBox : TextBox
{
public ItemCollection Items { get; set; }
}
When using the custom ...
- 1,105
63
votes
3
answers
52k
views
What are the defaults for Binding.Mode=Default for WPF controls?
In WPF Binding.Mode, when selecting Default, it depends in the property being binded.
I am looking for some list or some convention or any information for the defaults for the various controls.
I ...
- 104k
59
votes
4
answers
16k
views
What's the difference between Dependency Property SetValue() & SetCurrentValue()
The reason why I am asking this is because I was recommended by @Greg D (from this question) to use SetCurrentValue() instead, but a look at the docs and didn't see whats the difference. Or whats does ...
- 86.5k
57
votes
9
answers
37k
views
Error while removing project dependency in VS2010
I have a large solution with number of projects.
Some the projects depend on others (never a circular dependency though).
When I tried to remove a dependency of a project, I am getting an error ...
- 3,384
52
votes
9
answers
35k
views
Hiding inherited members
I'm looking for some way to effectively hide inherited members. I have a library of classes which inherit from common base classes. Some of the more recent descendant classes inherit dependency ...
- 12.2k
45
votes
2
answers
20k
views
Setters not run on Dependency Properties?
Just a short question, to clarify some doubts. Are setters not run when an element is bound to a dependency property?
public string TextContent
{
get { return (string)GetValue(TextContentProperty)...
- 86.5k
44
votes
4
answers
23k
views
DependencyProperty.Register() or .RegisterAttached()
What's the difference between the two, when should RegisterAttached() be used instead of .Register()?
- 21.6k
42
votes
2
answers
16k
views
Why dependency properties?
Why did Microsoft go the route of making dependency properties and dependency objects instead of using reflection and maybe attributes?
- 9,338
39
votes
1
answer
24k
views
How to use Attached property within a style?
I have created an Image within a ButtonStyle. Now I have created an Attached Property so that I can set the Source for that Image. Should be straight forward but I am stuck with it.
This is my ...
- 65.6k
38
votes
5
answers
27k
views
What is the difference between Property and Dependency Property
Dependency properties are created the same way as properties.
Is a dependency property used only while creating a custom control?
37
votes
5
answers
17k
views
When to use a WPF Dependency Property versus INotifyPropertyChanged
Do folks have any guidance on when a simple .NET property that fires INotifyPropertyChanged.PropertyChanged is sufficient in a view model? Then when do you want to move up to a full blown dependency ...
- 199k
35
votes
3
answers
43k
views
Why do I get a DependencyProperty.UnsetValue when converting a value in a MultiBinding?
I have an extremely simple IMultiValueConverter that simply OR's two values. In the example below, I want to invert the first value using an equally simple boolean inverter.
<MultiBinding ...
- 5,656
28
votes
1
answer
5k
views
WPF - Compilation error: Tags of type 'PropertyArrayStart' are not supported in template sections
Ordinarily I wouldn't just post an error message on SO, but after a Google search only found one hit, I thought I'd at least open the floor for this error here on SO.
I have a custom control called ...
- 308k
28
votes
3
answers
40k
views
Wpf UserControl and MVVM
I am thinking about writing a WPF User Control for my application. I am using MVVM in my application.
User control's may require Dependency Properties that can be set my Parent View. when using MVVM,...
- 1,685
28
votes
1
answer
45k
views
Binding to custom dependency property - again
The task: implement the simplest Dependency Property ever, which can be used in xaml like that:
<uc:MyUserControl1 MyTextProperty="{Binding Text}"/>
I think that this answer is quite ...
- 3,230
27
votes
3
answers
19k
views
ObservableCollection dependency property does not update when item in collection is deleted
I have a attached property of type ObservableCollection on a control. If I add or remove items from the collection, the ui does not update. However if I replace the collection within with a new one ...
- 905
26
votes
5
answers
24k
views
Quickly create dependency properties in VS
Is there any way to speed up creating dependency properties in Visual Studio? Like some template or refactoring option that will make dependency property out of normal one. Anything. I create a lot of ...
- 17.6k
26
votes
1
answer
8k
views
How can I change the default value of an inherited dependency property?
How can I change the default value for an inherited dependency property? In our case, we've created a subclass of Control which by default has its Focusable set to 'true'. We want our subclass to ...
- 29.8k
26
votes
2
answers
40k
views
How to simply bind this to ConverterParameter?
I have problem and i don't know how to solve this simple, i have many points like this, then solution should be not complicated.
I have main project with Settings and main XAML.
I have dependency ...
- 16.5k
26
votes
2
answers
11k
views
Dependency Property dependent on another
How can one register a dependency property whose value is calculated using the value of another dependency property?
Because the .NET property wrappers are bypassed by WPF at run-time, one should not ...
- 1,717
24
votes
7
answers
27k
views
'{DependencyProperty.UnsetValue}' is not a valid value for property 'FocusVisualStyle'
I have a weird error I'm trying to debug with no luck.
I have subclassed hwndhost showing some content, I have the following function in that class to set to fullscreen:
private void ...
- 1,959
24
votes
2
answers
15k
views
Defining InputBindings within a Style
I'm creating a WPF app using the MVVM design pattern, and I'm trying to extend the TabItem control so that it closes the tab when the user clicks the middle mouse button. I'm trying to achieve this ...
- 1,773
24
votes
3
answers
23k
views
Twoway-bind view's DependencyProperty to viewmodel's property?
Multiple sources on the net tells us that, in MVVM, communication/synchronization between views and viewmodels should happen through dependency properties. If I understand this correctly, a dependency ...
- 19.7k
23
votes
2
answers
31k
views
Binding to UserControl DependencyProperty
I have created a UserControl with some DependencyProperties (in the example here only one string property). When I instantiate the Usercontrol, I can set the property of the UserControl and it is ...
- 789
23
votes
1
answer
21k
views
WPF ValidationRule with dependency property
Suppose you have a class inheriting from ValidationRule:
public class MyValidationRule : ValidationRule
{
public string ValidationType { get; set; }
public override ValidationResult ...
- 12.2k
23
votes
1
answer
25k
views
Custom Control Dependency Property Binding
I am going insane trying to get this to work with even the most basic example. I cannot for the life of me get binding to work. Here is a super easy example that is not working for me. I MUST be doing ...
- 2,408
22
votes
2
answers
22k
views
WPF usercontrol Twoway binding Dependency Property
I created a Dependency Property in the usercontrol, but however changes in the usercontrol was NOT notified to the Viewmodel
Usercontrol
<UserControl x:Class="DPsample.UserControl1"
...
- 4,315
22
votes
2
answers
9k
views
Why dependency properties in WPF has to be Static
Why a dependency property has to be Static?
I have seen that it has been already asked in some post here, but I am not able to understand it properly.
It will be great if someone can help me ...
- 5,286
22
votes
1
answer
28k
views
How to use PropertyChangedCallBack
I have a TextBox Binded to a dependancy property, I have implemented a PropertyChangedCallBack function, when the text changes I need to call textbox.ScrollToEnd() but I cant since the PropertChanged ...
- 8,946
22
votes
4
answers
9k
views
WPF override IsEnabled from Parent
I just searched for a way to enable a child control while the parent control has IsEnabled = false.
All answers that I have found up to now say that it is not possible - one has to enable the parent ...
- 1,361
20
votes
4
answers
9k
views
What's the framework mechanism behind dependency properties?
I have been reading about dependency properties in several books but all have one thing in common, they just tell us how they are implemented( using static readonly DependencyProperty etc.) but does ...
- 5,408
20
votes
4
answers
29k
views
What is a dependency property? What is its use? [duplicate]
Possiblity:
What is a dependency property?
What is a dependency property? How does it differ from a normal property? What is the purpose of dependency properties? And why it is used, when it is ...
- 620
20
votes
4
answers
11k
views
Maven: Import pom properties from different pom
I would like to import properties from a project X pom file into my project Y pom such as library versions. I do not want to make the project X my project's parent.
I have tried to include project ...
- 1,327
19
votes
2
answers
50k
views
How to bind to a WPF dependency property when the datacontext of the page is used for other bindings?
How to bind to a WPF dependency property when the datacontext of the page is used for other bindings? (Simple question)
- 50.3k
19
votes
3
answers
7k
views
Getting "<Property Name> was already registered by "<Control Name>" error in WPF
I have a user control in WPF that has a binding to a Dependency Property. When I try to compile the app, I get a "Property Name" was already registered by "ControlName" error, and the designer shows a ...
- 1,330
19
votes
5
answers
21k
views
How to debug DependencyProperty.Unsetvalue errors when the InnerException is null
I have a custom login usercontrol that has a normal textbox and a passwordbox.
Blend refuses to cooperate with the PasswordBox saying that "DP.UnsetValue" is not valid for PasswordChar property. ...
- 2,583
19
votes
5
answers
29k
views
Binding UserControl Dependency Property and MVVM
I have a MainWindow containing a UserControl, both implemented in MVVM-pattern.
The MainWindowVM has properties that I want to bind to properties in the UserControl1VM. But this doesn't work.
Here's ...
- 747
19
votes
1
answer
6k
views
C# WPF Attached Properties - Error: "The property does not exist in XML namespace"
I need to create a new property to existing WPF controls (Groupbox, textbox, checkbox, etc), one that will storage its acess Level, therefore I've found out Attached Properties.
I used as example this ...
- 787
18
votes
1
answer
11k
views
How to subscribe to change DependencyProperty? [duplicate]
Possible Duplicate:
Listen to changes of dependency property
Excuse me for my English.
I need to create a class that could subscribe to change DependencyProperty, and depending on the new value ...
- 1,765
18
votes
2
answers
21k
views
Listen to DependencyProperty changed event and get the old value
I have the following code to subscribe to property changed event for VisiblePosition property of Column class:
DependencyPropertyDescriptor dpd = DependencyPropertyDescriptor.FromProperty(ColumnBase....
- 12.3k
18
votes
2
answers
6k
views
DependencyProperty doesn't fire ValueChanged when new value is the same
Ok so here's the problem: I wrote a UserControl which receives a new value say like every 100ms and does something with it. It has to handle each new value setter, even if the value didn't change. The ...
- 7,533
17
votes
7
answers
1k
views
Demystifying Dependency Properties
I have read about dependency properties a lot on SO and other sites. But, really haven't found a great explanation and am still confused. I use both SL and WPF. Are they different in SL and WPF, in ...
- 8,098
17
votes
3
answers
12k
views
Binding a PyQT/PySide widget to a local variable in Python
I'm pretty new to PySide/PyQt, I'm coming from C#/WPF. I've googled alot on this topic but it no good answer seems to show up.
Ii want to ask is there a way where I can bind/connect a QWidget to a ...
- 802
17
votes
5
answers
6k
views
Need a short and clear definition for "Dependency Properties"
I'm trying to figure out what exactly Dependency Properties are, but when I look anywhere for a definition, I only find "how to use" but not "what it is".
Imagine you are asked on a job interview - ...
- 21k