how to passing parameters through dependencyproperty

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hi all

iam creating a property with help of dependencyproperty.

C#

public bool IsPurpule
      {
          get { return (bool)GetValue(IsPurpuleProperty); }
          set { SetValue(IsPurpuleProperty, value); }
      }

      // Using a DependencyProperty as the backing store for IsPurpule.  This enables animation, styling, binding, etc...
      public static readonly DependencyProperty IsPurpuleProperty =
          DependencyProperty.Register("IsPurpule", typeof(bool), typeof(mystackpanel), new UIPropertyMetadata(false, IsPurplePropertyChanged));

      private static void IsPurplePropertyChanged(DependencyObject dependency, DependencyPropertyChangedEventArgs args)
      {
          mystackpanel stackpanel = dependency as mystackpanel;

          if (stackpanel != null)
          {
                                     //if i want pass color from xaml how to pass the colr insted of brushes.purple
              stackpanel.Background = Brushes.Purple;
          }

      }

XML

//xaml code
                       //here insted of bool variable i want to pass color?  
<local:mystackpanel IsPurpule="True" >

        </local:mystackpanel>

how can i do this let me know?

Thanks in advance

Posted 12-Jul-12 22:29pm

U@007

Updated 13-Jul-12 0:03am

v3

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Comments

markovl 13-Jul-12 4:35am

This doesn't make much sense. Why not use the StackPanel.Background property to assign a background?

U@007 13-Jul-12 4:38am

if i want to create mycustomcolor(as a background) property
how can i do?

2 solutions

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markovl · Answer 1 · 2012-07-12T22:58:00

Solution 2

If you want to achieve similar functionality to the Background property, you could use a Brush type DependencyProperty:

C#

public Brush MyCustomColor
{
    get { return (Brush)GetValue(MyCustomColorProperty); }
    set { SetValue(MyCustomColorProperty, value); }
}
		
public static readonly DependencyProperty MyCustomColorProperty =
    DependencyProperty.Register("MyCustomColor", typeof(Brush), typeof(mystackpanel));

Posted 12-Jul-12 22:58pm

markovl

Comments

U@007 13-Jul-12 6:03am

implement onproperty also

markovl 13-Jul-12 6:27am

Try to do that yourself. Otherwise how do to you expect to learn?

U@007 16-Jul-12 1:47am

public Brush MyBackground
{
get { return (Brush)GetValue(MyBackgroundProperty); }
set { SetValue(MyBackgroundProperty, value); }
}

// Using a DependencyProperty as the backing store for MyBackground. This enables animation, styling, binding, etc...
public static readonly DependencyProperty MyBackgroundProperty =
DependencyProperty.Register("MyBackground", typeof(Brush), typeof(mystackpanel),new PropertyMetadata(System.Windows.Media.Brushes.White,MyCustomBackground));

private static void MyCustomBackground(DependencyObject dendencey, DependencyPropertyChangedEventArgs args)
{
mystackpanel stack = dendencey as mystackpanel;
if (stack != null)
{ //how can i pass here the parameter (color from xaml)
stack.MyBackground = System.Windows.Media.Brushes.Red;
}
}

markovl 16-Jul-12 1:59am

It is not quite clear what you're trying to achieve here.
The MyCustomBackground callback is called when the value of MyBackground changes - if you assign a value to it from XAML it will become the value of MyBackground.

I suggest you read on dependency properties:
- on MSDN: http://msdn.microsoft.com/en-us/library/ms752914.aspx
- a nice series by Josh Smith: http://joshsmithonwpf.wordpress.com/2007/05/16/demystifying-dependency-properties/

Santhosh Kumar Jayaraman · Answer 2 · 2012-07-12T22:44:00

Solution 1

Instead of bool make it as typeof string

Posted 12-Jul-12 22:44pm

Santhosh Kumar Jayaraman