The event is seen differently from outside the class .. try this. I
think you can only do this for classes that you have control over.
public class Test
{
public event EventHandler Something;
public void DoSomething()
{
if (Something != null)
{
Something(this, null);
}
}
public void PrintListenners()
{
PrintListenners(Something);
}
static void PrintListenners(Delegate del)
{
foreach (Delegate d in del.GetInvocationList())
{
Console.WriteLine("Method Name: {0}", d.Method);
Console.WriteLine("Type Name: {0}", d.Target);
}
}
}
class Program
{
static void Main(string[] args)
{
Test t = new Test();
t.Something += new EventHandler(t_Something);
t.Something += new EventHandler(t_Something2);
t.PrintListenners();
}
static void t_Something2(object sender, EventArgs e)
{
Console.Write("Something2");
}
static void t_Something(object sender, EventArgs e)
{
Console.Write("Something");
}
}
Cheers,
Greg
On 2/14/07, Mike Andrews <[EMAIL PROTECTED]> wrote:
Thank you
After some investigation, I cannot seem to get this to work.
I created this method:
private static void DisplayDelegate(Delegate obj) {
foreach (Delegate d in obj.GetInvocationList()) {
Console.WriteLine("Method Name: {0}", d.Method);
Console.WriteLine("Type Name: {0}", d.Target);
}
}
and called the method as such:
DisplayDelegate(cb.CheckedChanged)
where
cb is a System.Web.UI.WebControls.CheckBox
and the compiler tells me:
The event 'System.Web.UI.WebControls.CheckBox.CheckedChanged' can only
appear on the left hand side of += or -=
What might I be doing incorrectly here?
Is what I want to do even possible?
Thanks,
Mike
On 2/14/07, Phil Sayers <[EMAIL PROTECTED]> wrote:
>
> google for GetInvocationList
> that should point you in the right direction
>
>
> -----Original Message-----
> From: Discussion of advanced .NET topics.
> [mailto:[EMAIL PROTECTED] Behalf Of Mike Andrews
> Sent: Wednesday, February 14, 2007 2:52 PM
> To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM
> Subject: [ADVANCED-DOTNET] Determining if an event has been assigned a
> delegate...
>
>
> Guys,
>
> Do any of you know if it's possible to determine if an event for an object
> has been assigned a delegate?
>
> Example:
>
> Dim cb As New CheckBox()
> cb.Name = "MyCheckBox"
> AddHandler(cb.CheckChanged, AddressOf CheckChanged)
>
> ...
>
> Public Sub CheckChanged(Object sender, EventArgs e)
> ...
> End Sub
>
> Is it possible to know if cb.CheckChanged has been assigned a handler or
> not?
>
> Thanks,
> Mike
>
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