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Codeproject: Events and event handling in C#[^]

30-Jul-07 22:06

Re: How decline event in C# class ? ? ? [modified]

Martin#30-Jul-07 22:41

Martin#

30-Jul-07 22:41

Hello,

Yanshof wrote:
is to send events from the some of the user control to this simple C#

Your UserControl should implement an event like this:

public event EventHandler SomethingChanged;

and fire it like this:

if (SomethingChanged!= null) 
{
    SomethingChanged(this, EventArgs.Empty); //or implement your own EventArgs
}

Your class, (which holds the instance of the form where the usercontrols are on) should implement a method which returns a list of your UserControl:

private ArrayList GetAllUserControls(Control c, ArrayList allUserControls)
{
    if(allUserControls == null)
    {
	allUserControls = new ArrayList();
    }
    if(c!=null)
    {
	if(c.Controls!=null)
	{
            foreach(Control actControl in c.Controls)
            {
		YourUserControl actYourControl = actControl as YourUserControl;
		if(actYourControl!=null)
		{
                    allUserControls.Add(actYourControl);
		}
		//recursive call
		allUserControls= GetAllUserControls(actControl, allUserControls);
            }
	}
    }
    return allUserControls;
}

And call it like that:

ArrayList allUserControls = GetAllUserControls(yourForm, null);

Then you can register the Events.
I would recommend a method which does also the unregistering for your Dispose method.

private void EditEvent(ArrayList allUserControls, bool register)
{
    foreach(object o in allUserControls)
    {
	YourUserControl actYourControl = o as YourUserControl;
	if(actYourControl!=null)
	{
            if(register)
            {
		actYourControl.SomethingChanged+=new EventHandler(actYourControl_SomethingChanged);
            }
            else
            {
		actYourControl.SomethingChanged-=new EventHandler(actYourControl_SomethingChanged);
            }
        }
    }
}

And call it like that (you have to pass the List of UserControls which you got from the GetAllUserControls method):

EditEvent(allUserControls, true);

and in the dispose method:

EditEvent(allUserControls, false);

To find the correct instance in the handler:

private void actYourControl_SomethingChanged(object sender, EventArgs e)
{
    YourUserControl actYourControl = sender as YourUserControl;
    if(actYourControl!=null)
    {
 
    }
}

Yanshof wrote:
the C# class will also send events to those user control.

Here I would use a static event in the class.

Hope it helps!

-- modified at 5:21 Tuesday 31st July, 2007

All the best,

Martin

Re: How decline event in C# class ? ? ?

Yanshof30-Jul-07 23:01

Yanshof

30-Jul-07 23:01

Can you please explain what do you meed in the line

"YourUserControl actYourControl = actControl as YourUserControl"

?

Thanks.

Re: How decline event in C# class ? ? ?

Martin#30-Jul-07 23:05

Martin#

30-Jul-07 23:05

Yanshof wrote:
YourUserControl actYourControl = actControl as YourUserControl

The 'as' operator tries to cast the Control instance "actControl" to an instance of YourUserControl.
If the cast is not working it will return 'null', an ddoes not throw an exception (like "(YourUserControl)actControl" would do)

All the best,

Martin

Re: How decline event in C# class ? ? ?

Martin#30-Jul-07 23:22

Martin#

30-Jul-07 23:22

Sorry, there was an error in this line, changed it now!

All the best,

Martin

Print the scrolled content of a windows form

pranu_1330-Jul-07 21:26

pranu_13

30-Jul-07 21:26

I have a windows application in .net 2.0. I use a webbrowser control to display an asp page which is on server. Below the browser control i display an electronic signature.

My requirement is to print this form. I tried to use the memorygraphics class and take the screenshot of the form and draw the image to printer. But this gives me only the part of the form visible on the client area.
The part which is visible on scrolling the form is left. I need the complete form along with the scrolled part.

How do i do this? Can any one help me?

Re: Print the scrolled content of a windows form

il_masacratore30-Jul-07 22:29

il_masacratore

30-Jul-07 22:29

Read this article. This maybe help you.

http://www.codeproject.com/cs/media/IECapture.asp

Visit my blog at http://dotnetforeveryone.blogspot.com/

Re: Print the scrolled content of a windows form

Herman<T>.Instance31-Jul-07 3:00

Herman<T>.Instance

31-Jul-07 3:00

<br />
Button btnPrint = new Button();<br />
btnPrint.Visible = false;<br />
btnPrint.Enabled = true;<br />
btnPrint.Click += new EventHandler(btnPrint_Click);<br />
btnPrint_Click(sender, e);<br />
<br />
...<br />
...<br />
<br />
private void btnPrint_Click(object sender, EventArgs e)<br />
    {<br />
        String Script = String.Empty;<br />
        Script = "<script language='javascript'>";<br />
        Script += "window.print();window.close();";<br />
        Script += "</script>";<br />
<br />
        ClientScript.RegisterStartupScript(this.GetType(), "print", Script);<br />
    }<br />

access modifiers

pavanteja30-Jul-07 21:20

30-Jul-07 21:20

can anybody explain about friend and protected friend briefly? i have seen somewhere it is protected or friend but not protected and friend...what is the use of protected friend? we have friend, protected separately? Smile | :)

pavan...

originSH30-Jul-07 22:04

30-Jul-07 22:04

It's not called 'friend' in C# it's 'internal'.

'internal' means any class in the same assembly can access it.
'protected' means any class that any inheriting class can access it.
'internal protected' (or 'protected internal' Wink | ;)

) means that any class in the same assembly AND any inheriting class can access it.

In .Net 2.0 you can have 'friend' assemblies. If you make an assembly a 'friend' of another then it will have access to anything marked internal as if it was in the same assembly.

MSDN: Access Modifiers[^]

MSDN: Friend Assemblies[^]

pavanteja30-Jul-07 23:11

30-Jul-07 23:11

thanks, some what i have cleared..

pavan...

Sonia Gupta30-Jul-07 23:33

Sonia Gupta

30-Jul-07 23:33

if u please explain it a little bit with an example.that explains the limit of using there modifiers
Thanks You.

Sonia Gupta
Soniagupta1@yahoo.co.in
Yahoo messengerId-soniagupta1
Love is Friendship and Friendship is Love....

originSH31-Jul-07 0:03

31-Jul-07 0:03

If theres any part of what I said that you don't understand go and buy a book on C#. Inheritance and assemblies are all very basic concepts and you need to understand the basics well if you want to use C# to it's full extent.

pavanteja31-Jul-07 1:00

31-Jul-07 1:00

Protected internal ………meaning is protected or internal…which is selected by including
Both a protected and an internal modifier in the member declaration. The intuitive meaning of protected internal is “access limited to this program or types derived from the containing class.

Protected internal is a union of protected and internal in terms of
providing access but not restricting.
Meaning
Inherited types, even though they belong to a different assembly, have
access to the protected internal members
Types that reside in the same assembly, even if they are not derived from
the type; also have access to the protected internal members

pavan...

satellite assembly

pavanteja31-Jul-07 19:12

31-Jul-07 19:12

do u have any idea abt satellite assembly? Laugh | :laugh:

pavan...

Top C#/.Net sites

koger30-Jul-07 20:36

koger

30-Jul-07 20:36

Hello

Could you give me your top-10 list of C#/.Net pages to visit?
I'm relatively new to .Net, so I only know this one Wink | ;)

Re: Top C#/.Net sites

Colin Angus Mackay30-Jul-07 21:20

Colin Angus Mackay

30-Jul-07 21:20

kak_karsten wrote:
Could you give me your top-10 list of C#/.Net pages to visit?

http://www.codeproject.com/[^]
http://www.codeproject.com/[^]
http://www.codeproject.com/[^]
http://www.codeproject.com/[^]
http://www.codeproject.com/[^]
http://www.codeproject.com/[^]
http://www.codeproject.com/[^]
http://www.codeproject.com/[^]
http://www.codeproject.com/[^]
http://www.codeproject.com/[^]

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My website

Re: Top C#/.Net sites

originSH30-Jul-07 22:10