Creating DependencyProperties for a Class

The following code is needed if you want to animate Padding.Top of a control.

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1. public class MyClass : UserControl  
2. {  
3.   public static readonly DependencyProperty PaddingTopProperty =   DependencyProperty.Register("PaddingTop", typeof(double), typeof(MyClass), new PropertyMetadata(0d, new PropertyChangedCallback(OnPaddingTopPropertyChanged)));  
4.   
5.   public double PaddingTop  
6.   {  
7.     get  
8.     {  
9.       return Padding.Top;  
10.     }  
11.     set  
12.     {  
13.       Padding = new Thickness(Padding.Left, value, Padding.Right, Padding.Bottom);  
14.     }  
15.   }  
16.   
17.   private static void OnPaddingTopPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)  
18.   {  
19.     (d as MyClass).PaddingTop = (double)e.NewValue;  
20.   }  
21. }  

public class MyClass : UserControl
{
  public static readonly DependencyProperty PaddingTopProperty =   DependencyProperty.Register("PaddingTop", typeof(double), typeof(MyClass), new PropertyMetadata(0d, new PropertyChangedCallback(OnPaddingTopPropertyChanged)));

  public double PaddingTop
  {
    get
    {
      return Padding.Top;
    }
    set
    {
      Padding = new Thickness(Padding.Left, value, Padding.Right, Padding.Bottom);
    }
  }

  private static void OnPaddingTopPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
  {
    (d as MyClass).PaddingTop = (double)e.NewValue;
  }
}