silverlight EventHandlerList could not be found

**a82720** · Sep 3 '13, 02:17 AM

It's easy to obtain the values for the properties and fields or invoke methods but it has been difficult for me to get the delegate from an EventInfo.

I have tried following the instructions from this website:

http://bobpowell.net/eventsubscribers.aspx

This works to display the events in WINDOWS FORMS

Code:

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public Delegate[] GetEventSubscribers(object target, string eventName)
        {
            string WinFormsEventName = "Event" + eventName;
            Type t = target.GetType();          
            do
            {
                FieldInfo[] fia = t.GetFields(BindingFlags.Static | BindingFlags.Instance | BindingFlags.NonPublic);
                foreach (FieldInfo fi in fia)
                {
                    if (fi.Name == eventName)
                    {
                        //we've found the compiler generated event
                        Delegate d = fi.GetValue(target) as Delegate;
                        if (d != null)
                            return d.GetInvocationList();
                    }
                    if (fi.Name == WinFormsEventName)
                    {
                        //we've found an EventHandlerList key
                        //get the list
                        EventHandlerList ehl = (EventHandlerList)target.GetType().GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy).GetValue(target, null);
                        //and dereference the delegate.
                        Delegate d = ehl[fi.GetValue(target)];
                        if (d != null)
                            return d.GetInvocationList();
                    }
                }
                t = t.BaseType;
            } while (t != null);

            return new Delegate[] { };
        }

        private void button1_Click(object sender, EventArgs e)
        {
            System.Reflection.EventInfo[] eventInfo = button1.GetType().GetEvents();
            for (int i = 0; i < eventInfo.Length; i++)
            {
                textBox1.Text = GetEventSubscribers(button1, eventInfo[i].Name).Length.ToString() + "    " + textBox1.Text;
                Delegate[] dels = GetEventSubscribers(button1, eventInfo[i].Name);
                string text = string.Join(", ", dels.Select(d => d.Method.Name));
                textBox2.Text = text + ". " + textBox2.Text;
            }
        }      
    }
}

However, this WILL NOT WORK FOR SILVERLIGHT because Silverlight does not have a 'EVENTHANDERLIS T'

Any ideas for how I can display the event VALUES in Silverlight?

I also tried this.

Code:

namespace eventhandlers
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            Type t = sender.GetType();
            FieldInfo fi = t.GetFields(BindingFlags.Static | BindingFlags.Instance | BindingFlags.NonPublic);

            EventHandler eh = (EventHandler)fi.GetValue(sender);

            System.Reflection.EventInfo[] eventInfo = button1.GetType().GetEvents();                
            Delegate[] dels = eh.GetInvocationList();
            foreach(Delegate del in eh.GetInvocationList() )
            {
                string text = del.Method.Name;
                textBlock1.Text = text + ". " + textBlock1.Text;
            }
        }
    }
}

But I get the error "FieldAccessExc eption was unhandled by user code' and ''SilverlightAp p1.MainPage.but ton1_Click (System.Object, System.Windows. RoutedEventArgs )' method 'System.Windows .Controls.Primi tives.ButtonBas e._isLoaded' failed to access the field." at

Code:

 EventHandler eh = (EventHandler)fi.GetValue(sender);