Solved

How do I pass parameters/objects to an Eventhandler?

Posted on 2008-10-11
2
2,947 Views
Last Modified: 2013-12-17
I am confused as to how I have to pass parameters/objects to an Eventhandler?

I have:

linklabel.click  += new EventHandler(hwIDForm);
linklabel is a LinkLabel type object.

which points to a method with signature:

private static void hwIDForm(object sender, EventArgs e){}

I derived a new class from EventArgs and added to it the ability to return the objects I want to pass, but I am at a loss as to how I pass it to hwIDForm when I define the event, there are no overloads to specify.
Any help is appreciated. MSDN
0
Comment
Question by:Matt_Du
2 Comments
 
LVL 55

Accepted Solution

by:
Jaime Olivares earned 125 total points
ID: 22695539
in this case, you can't. the click event has a defined argument class. What you you want to pass? you can put some info at linklabel's Tag property, so you can retrieve as:

object info = (sender as Control).Tag;
0
 
LVL 26

Assisted Solution

by:Anurag Thakur
Anurag Thakur earned 125 total points
ID: 22697370
As already mentioned by Jaime Olivares you cannot use the click event. In order to use your own event you have to take the following steps

How to Raise an Event
At a minimum, you must do three things to raise an event:

Create a delegate:
// C#
public delegate void MyEventHandler(object sender, EventArgs e);

Create an event member:
// C#
public event MyEventHandler MyEvent;

Invoke the delegate within a method when you need to raise the event, as the following code demonstrates:
// C#
MyEventHandler handler = MyEvent;
EventArgs e = new EventArgs();
if (handler != null)
{
    // Invokes the delegates.
    handler(this, e);
}
// Note that C# checks to determine whether handler is null.

Additionally, you can derive a custom class from EventArgs if you need to pass information to the event handler.

0

Featured Post

DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The object model of .Net can be overwhelming at times – so overwhelming that quite trivial tasks often take hours of research. In this case, the task at hand was to populate the datagrid from SQL Server database in Visual Studio 2008 Windows applica…
This document covers how to connect to SQL Server and browse its contents.  It is meant for those new to Visual Studio and/or working with Microsoft SQL Server.  It is not a guide to building SQL Server database connections in your code.  This is mo…
This demo shows you how to set up the containerized NetScaler CPX with NetScaler Management and Analytics System in a non-routable Mesos/Marathon environment for use with Micro-Services applications.
When you create an app prototype with Adobe XD, you can insert system screens -- sharing or Control Center, for example -- with just a few clicks. This video shows you how. You can take the full course on Experts Exchange at http://bit.ly/XDcourse.

914 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now