How can i set a default value for a dependency property of type derived from dependencyobject

Question

I am new to WPF and this is my first post. I have created a class called 'Fruit' that descends from 'DependencyObject' and adds and extra property called 'Apple'. I have created a new custom control that includes a Dependency Property called 'MyFruit' of type 'Fruit'. My question is, how can i set the default value for the properties within 'MyFruit' object (i.e. the 'Apple' property? I would like to set this in XAML using the object.

public class Gauge : Control {     .     .     .      //---------------------------------------------------------------------     #region MyFruit Dependency Property      public Fruit MyFruit     {         get { return (Fruit)GetValue(MyFruitProperty); }         set { SetValue(MyFruitProperty, value); }     }      public static readonly DependencyProperty MyFruitProperty =         DependencyProperty.Register("MyFruit", typeof(Fruit), typeof(CircularGauge), null);      #endregion   }    //------------------------------------------------------------------------- #region Fruit class  public class Fruit : DependencyObject {     private int apple;      public int Apple     {         get { return apple; }         set { apple = value; }     }   }  #endregion 

Answer 1

Instead of null in your dependency property metadata insert

new UIPropertyMetadata("YOUR DEFAULT VALUE GOES HERE") 

So now it becomes

public static readonly DependencyProperty MyFruitProperty =     DependencyProperty.Register("MyFruit", typeof(Fruit), typeof(CircularGauge), new UIPropertyMetadata("YOUR DEFAULT VALUE GOES HERE")); 

Answer 2

You need to use PropertyMetaData like this:

class MyValidation {     public bool status     {         get { return (bool)GetValue(statusProperty); }         set { SetValue(statusProperty, value); }     }          public static readonly DependencyProperty statusProperty = DependencyProperty.Register("status", typeof(bool), typeof(MyValidation),new PropertyMetadata(false)); }