WPF Dependency Property

That's like third article I've read and I still don't understand what dependency property is. So it's an object in your class. Your class should inherit from DependencyObject in order to use DependencyProperty. But I still don't understand what DependencyProperty is and how to use it. Why no one explains DependencyProperty.Register method and how to use it? What are this list of arguments you passed to the Register method ("MyProperty", typeof(string), typeof(CarDependencyProperty)? Why no one explains DependencyProperty class, its members and how to use it? What's the purpose of MyCar property? Where do you get GetValue and SetValue methods from? What are they doing, exactly? "They get and set value" duh. But where do they get and set what value, exactly?? There are like 20 questions that need to be answered in order to understand that DependencyProperty object and how to use it but no one answers them and talks about this DependencyProperty object like everyone who's reading already knows all this information. But if I knew all this information beforehand, I wouldn't search and open your article in the first place. In pre-requisites you said "Before doing that, I hope you are familiar with some basic knowledge of the CLR, Object-Oriented Programming and have made at least one simple WPF application". Then you start your application with Window.Resources and continue with XAML extensions and data binding. That's far from "at least one" and "simple WPF application". That's advanced stuff that you don't learn in first chapters of books. People start using XAML extensions either at the end of intro C#/WPF/XAML books(few tenths of simple applications) or in the intermidiate level books(Mastering WPF, Design Patterns books or alike).

Clear explanation. Thanks for it

What is CarDependency in 1st line of MyButton_Click(object sender, RoutedEventArgs e)?

Good work keep it up

NOT completed , you should explain with complete example ,what you have shared is half.

Not helpful

public class CarDependencyProperty : DependencyObject { //Register Dependency Property public static readonly DependencyProperty CarDependency = DependencyProperty.Register("MyProperty", typeof(string), typeof(CarDependencyProperty)); public string MyCar { get { return (string)GetValue(CarDependency); } set { SetValue(CarDependency, value); } } } in XAML.cs file private void MyButton_Click(object sender, RoutedEventArgs e) { CarDependencyProperty dpSample = TryFindResource("CarDependency") as CarDependencyProperty; MessageBox.Show(dpSample.MyCar); } in XAML file <Window.Resources> <local:CarDependencyProperty x:Key="CarDependency"></local:CarDependencyProperty> </Window.Resources> <Grid> <Grid.RowDefinitions> <RowDefinition /> <RowDefinition /> </Grid.RowDefinitions> <Label Content="Enter Car:" Grid.Row="0" VerticalAlignment="Center" /> <TextBox Text="{Binding Path=MyCar, Source={StaticResource CarDependency }}" Name="MyTextCar" Height="25" Width="150" HorizontalAlignment="Right" Margin="0,18,165,18" /> <Button Name="MyButton" Content="Click Me!" Height="25" Click="MyButton_Click" Width="150" Grid.Row="1" /> </Grid>

Demo will work with below code changes . Copy below code into noted pad and then paste into XMAL file

Complete sample code is so confusing, its better that please don't post the code if it is not correct.

I think instead of DependencyPropertySample in DependencyProperty ,we have to use typeof(CarDependencyProperty)

Can you please explain about "DependencyPropertySample"? I tried and not getting information about "DependencyPropertySample" . Please explain...

"DependencyPropertySample" , where this class is defined?

nice article but it leaves many of the important concept of DP

Thought of posting an article on Dependency Property...but this is great and I dropped the idea...wonderful post...keep posting :)

it is not working...

Hi Deepika, i have tried to follow you code but i am not getting what is DependencyPropertySample. please clarify

Nice writeup

Nice article:)

a nice Article

Also note that in the sample code, I do not understand how the XAML is related to the Code Behind. In the XAML is "CarDependency" twice but I do not see how that is related to the CarDependencyProperty class. I see that the CarDependencyProperty class has a member called CarDependency; is that how the XAML is related to the Code Behind? If the local:DependencyPropertySample resource, StaticResource CarDependency Source of the TextBox and the CarDependency member of the CarDependencyProperty are all related then it would really help to explain how.

Welcome to C# Corner. Thank you for explaining Dependency Properties, I was not familiar with the definition of the term. You explained it well except there is one thing that I think it would help if it was clarified. You say that a Dependency Property is "in a dictionary of keys and values provided by the base class DependencyObject". It is not clear to me however where that is.

Nice Artcle,Welcome to c-sharp corner.

Good start deepika welcome to the c# corner