help :about event in c#

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i am studying c# recently and understand many object-oriented ideas.
acording to "event" in c# ,i think it is very useful. my question is:
if there is a main form and another subform in my project and the subform is
actived in mainform by constructing a subform object and calling showdialog method. at the same time there is a button in subform, when user click this button ,we can do something in button_click event handler funtion created by .net .
how can i inform the main form that the subform is now dealing with button_click event and set the focus on main form.
thanks.

Posted 1-Nov-11 6:12am

wuxi_taihu

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3 solutions

Solution 1

Changing focus this way is a bad idea, but you can do the following for the events :

1) Expose the button on the subform by setting the modifier to public and attaching on to it in the main form.

2) Creating a new event and firing that in the sub form, and attaching on to it in the main form as before.

Posted 1-Nov-11 6:20am

Mehdi Gholam

Solution 3

There is no such concept as "subform", period. Please ask about something valid.

—SA

Posted 1-Nov-11 6:27am

Sergey Alexandrovich Kryukov

v2

Comments

wuxi_taihu 1-Nov-11 12:36pm

sorry ,subform means another form which is shown by a function in main form

DaveyM69 1-Nov-11 16:21pm

It's quite obvious that he means a 'Child' form i.e. one that is instanciated by another (main in this case) as the other posters realised.
As a regular in QA you should also realise that what you posted is a comment not a solution. I'll leave it for you to ammend.

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fjdiewornncalwe · Accepted Answer · 2011-11-01T06:23:00

Because you are using the ShowDialog function to show your 2nd form, you won't be able to return focus to your main form without closing the new dialog. The first thing to do is to open your 2nd form using Show and not ShowDialog.
Then you can define an event in your second form. It can be as simple as this:

C#

public delegate void NoArgsEvent();
public event NoArgsEvent OnButtonClickEventNotify;

To cause the event to fire, just add a simple little block of code into your button click handler on form2.

if( OnButtonClickEventNotify != null )
{
    OnButtonClickEventNotify();
}

Then in your main form you just have to consume the event when you create an instance of your 2nd form:

C#

var dlg = new form2();
form2.OnButtonClickEventNotify += YourHandler;

void YourHandler()
{
    // Do something useful here.
    focus(); // To set the focus back to the main form.
}