Event handling with usercontrol containing other controls

[jralford]

Hi,

Another question from a C# newbie:
I have a usercontrol class that includes a customized control.
Now, if I create an instance of the class, and click on it, a click
event is raised for the customized control within the class. This is
good.
What I also want is to raise a click event for the class itself.

For instance,
If I have class A (user control), with Custombutton B in it,
I create an instance of A.
then at runtime if I click on B, My Custombutton code can see the
click and act accordingly (which is good), however, my A class wont
report back that the A usercontrol has been clicked.
How can I do this?

I am guessing it is something like, within the class, declare
delegates etc, and if the Custombutton B is clicked, raise an event.

If this is the case, an example would be nice

(what I am actually trying to do here is have a usercontrol within a
form that I can click and drag around the screen. However, that
usercontrol has other controls within it. I should be able to click
and drag from anywhere within the usercontrol, even if clicking on
other controls)


Thanks very much.

 

[Joe Mayo]

Hi jralford,

You should wrap the Click event in your UserControl something like this:

namespace WebFormTest1
{
using System;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

/// <summary>
/// Summary description for WebUserControl1.
/// </summary>
public class WebUserControl1 : System.Web.UI.UserControl
{
protected System.Web.UI.WebControls.Button Button1;

public event EventHandler Click;

private void Page_Load(object sender, System.EventArgs e)
{
}

#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.Button1.Click += new System.EventHandler(this.Button1_Click);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void Button1_Click(object sender, System.EventArgs e)
{
if (null != Click)
{
Click(sender, e);
}
}
}
}

And given this HTML:

....
<form id="Form1" method="post" runat="server">
<P>
<uc1:WebUserControl1 id="WebUserControl11"
runat="server"></uc1:WebUserControl1>
</P>
</form>
....

Here's the WebForm snippet where it is used:

....
public class WebForm1 : System.Web.UI.Page
{
protected WebUserControl1 WebUserControl11;

private void Page_Load(object sender, System.EventArgs e)
{
WebUserControl11.Click += new EventHandler(WebUserControl1_Click);
}

private void WebUserControl1_Click(object sender, EventArgs e)
{
Response.Write("WebUserControl has been Clicked!");
}
....

Joe
--
http://www.csharp-station.com

Hi,

Another question from a C# newbie:
I have a usercontrol class that includes a customized control.
Now, if I create an instance of the class, and click on it, a click
event is raised for the customized control within the class. This is
good.
What I also want is to raise a click event for the class itself.

For instance,
If I have class A (user control), with Custombutton B in it,
I create an instance of A.
then at runtime if I click on B, My Custombutton code can see the
click and act accordingly (which is good), however, my A class wont
report back that the A usercontrol has been clicked.
How can I do this?

I am guessing it is something like, within the class, declare
delegates etc, and if the Custombutton B is clicked, raise an event.

If this is the case, an example would be nice

(what I am actually trying to do here is have a usercontrol within a
form that I can click and drag around the screen. However, that
usercontrol has other controls within it. I should be able to click
and drag from anywhere within the usercontrol, even if clicking on
other controls)


Thanks very much.