User control events on windows form

Daniel

I have a user control that contains a tab control on it. The control is used on a form. When I debug/test the control events (by running the app and loading the form), they don't seem to be firing on the form. I want to take action when the user changes tabs.

Thanks in advance.

Daniel

9 Replies

Know the answer? Post it — somebody with the same question will find it here.

Mike Gold19y ago
Here is a full sample:

User Control:

namespace TestPropogateTabEvent

{

public partial class UserControlWithTab : UserControl

{

public UserControlWithTab()

{

InitializeComponent();

}

public delegate void TabSelectionEventHandler(object sender, EventArgs e);

public event TabSelectionEventHandler PropogateSelectionChange;

private void tabControl1_SelectedIndexChanged(object sender, EventArgs e)
{

if (PropogateSelectionChange != null)
{
PropogateSelectionChange(sender, e);
}

}

}

}

Form Class:

namespace TestPropogateTabEvent

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

userControlWithTab1.PropogateSelectionChange += new UserControlWithTab.TabSelectionEventHandler(userControlWithTab1_PropogateSelectionChange);

}

void userControlWithTab1_PropogateSelectionChange(object sender, EventArgs e)

{

MessageBox.Show("Tab In User Control Pressed");

}

}

}
Mike Gold19y ago

Hi Daniel,

I've constructed a sample in the reply below. basically you are "bubbling up" the event from the tab in the user control into the form.
Daniel19y ago
Here is my code. I can't seemed to get it working

UserControl.cs
(declared outside of class)
public delegate void TabPageClickHandler(object sender, TabPageClickEventArgs e);

(declared inside of class)
public event TabPageClickHandler TabPageClick;

protected void OnTabPageClick(string tabName)
{
            //if anyone listening for event data
            //if an object is registered to be notifed of the event
            if (TabPageClick != null)
            {
                TabPageClickEventArgs args = new TabPageClickEventArgs();
                args.TabName = tabName;
                TabPageClick(this, args);
                MessageBox.Show("OnTabPageClick fired");
            }
}

//To run my test
private void tabClassProdEng_Selected(object sender, TabControlEventArgs e)
{
     OnTabPageClick(e.TabPageIndex.ToString());
}

Form.cs
(within initializecomponent() section)

ucProdEngineering.TabPageClick +=new TabPageClickHandler(ucProdEngineering_TabPageClick);
// I get an error above: "The name 'ucProdEngineering_TabPageClick' does not exist in the current context"

Thanks.

Daniel
Daniel19y ago
Thanks Jan.

Can you recommend the proper event to put the user control side code into?
- tabPage_Click
- tabControl_TabIndexChanged
- ???
Is there a benefit to one over the other....?

Thanks,

Daniel
Daniel19y ago
Thanks a million for posted an example of this. I will try it tomorrow and let you know how it works out.

I really appreciate the help.

Daniel
Jan Montano19y ago
UserControl1.cs:

public event TabControlEventHandler TabSelectedEvent;
tabControl1.Selected += new TabControlEventHandler(tabControl1_Selected);

void tabControl1_Selected(object sender, TabControlEventArgs e)
{
TabSelectedEvent(sender, e);

}

Form1.cs

userControl11.TabSelectedEvent+= new TabControlEventHandler(userControl11_TabSelectedEvent);

void userControl11_TabSelectedEvent(object sender, TabControlEventArgs e)
{
MessageBox.Show(e.TabPageIndex.ToString());

}

*If you want to handle tabpage_click event, just call the tabselectedevent from the tabpage_click event instead.
Daniel19y ago
Hi Richard,

I have read some initial info on custom events, but may need some additional help on the concept.

I want to handle the TabPage_click event (on my user control) on the form that that the control resides on. I am not quite sure how to pull that off.

Thanks in advance for any help you or ANYONE can provide.

Thanks,

Daniel
Daniel19y ago
Thanks for the post Richard.

I will google customer events first and then contain post back if I am still having problems.

Daniel
Richard Blythe19y ago
The event is fired but it is only visible inside the confines of you usercontrol class. If you want to trap the event inside the form you will need to write a custom event. Aw it ain't that hard! Do a google search on custom events and if you are still confused, let me know and I'll help you.

Cheers!
Richard