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  • Dependency Property

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    A Dependency property is a property which allow the analytical code to modify the properties of an object to minimize a data necessities by giving a powerful reporting system about to change of a data in a particular way.


    In dot net generally we have a two types of properties:
    1. Normal property
    2. DependencyProperty


     In this blog we discuss the Dependency property.
    To implement the Dependency Property we need to implement a UserControl class from a INotifyPropertyChanged interface first.

    public partial class UserControlDependencyProperty  : UserControl, INotifyPropertyChanged 
    { 
        public event PropertyChangedEventHandler PropChange; 
        protected void OnPropertyChanged(string propName) 
        { 
            if (PropChange!= null) 
            { 
                PropChange(this, new PropertyChangedEventArgs(propName)); 
            } 
        } 
    }
    

     

    Now create a normal property with name "Triangle"

    public string Triangle
    {  
        get { return GetValue(TriangleProperty).ToString(); }  
        set { SetValue(TriangleProperty, value); } 
    }
    

     

    After creating normal property we need to pass a property field that is used to store the data in above code as a parameter to a Register method to register the DependencyProperty in the CLR.

    public static readonly DependencyProperty TriangleProperty =
      DependencyProperty.Register("Triangle", typeof(string), typeof(UserControlDependencyProperty),
      new PropertyMetadata(string.Empty, OnTrianglePropertyChanged));

     

    Code for OnTrianglePropertyChanged event handler:

    private static void OnTrianglePropertyChanged(DependencyObject dependObject, 
                   DependencyPropertyChangedEventArgs e) 
    {  
        UserControlDependencyProperty userControl = dependObject as UserControlDependencyProperty ;  
        UserControlDependencyProperty.OnPropertyChanged("Triangle");  
        UserControlDependencyProperty.OnTrianglePropertyChanged(e); 
    }
    private void OnTrianglePropertyChanged(DependencyPropertyChangedEventArgs e) 
    { 
        txt1.Text = Triangle; 
    }
    

     

    Code for XAML

    <local:UserControlDependencyProperty triangle=" This is the Dependency Property Example" />

     

     

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