Trying to expose an event on a web user control to the designer

Question

User-2105009887 posted

I am creating a web user control that has several server controls on it, like Buttons and LinkButtons.  I have created several public properties in the web user control for use during design mode, and these show up nicely in the designer's Properties panel just fine.  I would like to do the same for an event I created in the web user control.  I can't seem to get it to be "seen" in the designer.  Is this even possible to do with a web user control, and, if so, what are the steps?

Thanks a lot!

 P.S.  I am working in Visual Web Developer 2008, if that makes a difference.

 

 

Answer 1

User-1301077487 posted

here is what u can do

 

 

 

create an event of ur user control

 Partial Class usercontrol
    Inherits System.Web.UI.UserControl

 Public Event control_event As control_delegate 

  Public Delegate Sub control_delegate(ByVal sender As Object, ByVal e As EventArgs)------------------------->delegate

 

 attach a handler to ur event

 Protected Sub page_init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
      

  AddHandler control_event, AddressOf _controlHandler

 

    End Sub

 

now suppose u need to raise this event  on button click u just need to raise this event  in button click handler

like this

protected void Button1_Click(object sender, EventArgs e)
  {
  
RaiseEvent control_event(me,e)
  
  }

 

 

and handle it  with its handler

like this

 

 Protected Sub  _controlHandler(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.SliderTextChange
       

//user control handler  add your code here  

    End Sub

 

 

 

 

Answer 2

User1187105292 posted

 

I created a TextBox variable in one of my C# classes and did a Go To Definition on it.

This is what I found:

public event EventHandler TextChanged;

Doing the same trick in VB should work.

Best I can do for you besides that is to suggest you read the chapters on event handlers in the language you are using.  (That's what I would have to do to get farther!)  Hope this helps you on your way!

Answer 3

User-2105009887 posted

Thanks for the replies, but each reply so far sort of misses the mark in its own way.  I already know how to create a delegate and an event and raise the event (I use C# by the way.)  And I've been scouring MSDN and books but keep coming up short there.

What I want to make happen is that, in Visual Studio, after my web user control is dragged onto an .aspx page, you should be able to click on it and then go to the properties panel for it and set various value properties I created (this part works already) and also click on the Events (Lightning bolt) button and see an event listed there that I created (right now, the Events button never even lights up.)  Double clicking in that entry would create an event handler stub in the current .aspx.cs file so you can code what to do based on the event args that I pass in.   

Is this possible to do for a web user control (obviously the data properties its possible for, but I mean the event part)? If not, I guess I have to create a server control from scratch, but if it is possible, what do I need to do?

Answer 4

User1187105292 posted

I created a class library project and created a custom control in it.  I defined an event per my prior post.  (I didn't write the code to make the event do something as you already know how to do that.)  I compiled the class library.

Then I went to my web app and added the class library as a reference.

I added the control to the toolbar (because vs2005 is "irregular" in performing that task), then dragged the control to a webpage.

Right click to properties on the control, press the event button and there was the event in the list.

 

Answer 5

User-2105009887 posted

Thank you. I guess the answer is that it can only be done by creating a custom control in a class library and can't be done for a straight web user control.  I'm kinda confused as to why, though, since either way the control will have the same inheritance.  But, again, thanks.

Answer 6

User1187105292 posted

I guess the answer is that it can only be done by creating a custom control in a class library and can't be done for a straight web user control.  I'm kinda confused as to why, though, since either way the control will have the same inheritance. 

Sorry, I normally only do custom controls, so I can't say one way or the other. 

Answer 7

User-342808847 posted

The answer is NO you cannot see the events in your Properties window. Check out http://bytes.com/forum/thread474190.html.