Windows Forms

10-Jan-09 0:48

hi i need help creating dynamic array button for my panel

which will generate the butons depending on how many records are in the database

i am doing it in C# windows form vs 2005

so far wat i have is
Button[] btnvalveselect = new Button[count];

can anyone help?

modified on Saturday, January 10, 2009 8:15 AM

Dave Kreskowiak10-Jan-09 3:02

Dave Kreskowiak

10-Jan-09 3:02

Depending on the number of records you're talking about, this can get out hand VERY quickly. You have to keep track of each button you create, wire up the event handlers you're going to need, and then, upon data refreshes, disconnect the event handlers, destroy the previous set of buttons and then create a new set.

Creating controls is expensive. Redrawing all those controls is, also, very expensive. The more controls you have, the longer it'll take your form to draw itself. So, if these buttons are going to end up in a scrolling environment, you may find that, with an increasing number of controls, scrolling performance slows down, dramatically.

To create a new Button:

Button newButton = new Button();
newButton.Location = new Point(x, y);
newButton.Size = new Size(100, 50);
newButton.Text = "Some Caption";
... blah, blah, blah ...
btnvalveselect[index] = newButton;
this.Controls.Add(newButton);

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Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

neodeaths10-Jan-09 3:54

10-Jan-09 3:54

yes i know how to create the button but i dont know how to make the btnvalveselect[index] dynamic
as

is there like a redim function?

or dynamic way to create it so that it have no limit to the size it can hold?

Luc Pattyn10-Jan-09 4:08

10-Jan-09 4:08

if the count can change, consider a List< Button> instead of an Array; that will hold any number
of Buttons, and you can Add, Remove and enumerate them (e.g. with foreach).

Smile | :)

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Love, happiness and fewer bugs for 2009!

neodeaths10-Jan-09 4:36

10-Jan-09 4:36

ah i see what u mean but my ideal gui currently is a panel which hold a dynamically amount of buttons which would navigate by buttons outside the panel.

so far i have been able to get it all down except how to make a button array dynamic to hold an uncertain amount of array number.

any idea how?

and by the way i agree that a list box or buttons would solve the button easily too.
how ever i think because of the specific way i am placing the buttons in the panels i may have to choose the first way.

Luc Pattyn10-Jan-09 4:54

10-Jan-09 4:54

Are you familiar with generic lists, such as List< Button> or the old ArrayList?
If not, I suggest you read up on them, you won't use many arrays once you understand them.
They behave pretty much like a stretchable array, they can grow and shrink, you don't have to know
the size when you create them, and you can use an index on them as if they were arrays (internally
they are).

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Love, happiness and fewer bugs for 2009!

Luc Pattyn10-Jan-09 3:51

10-Jan-09 3:51

Hi,

if you are listing something (possibly with an unknown count), then want to operate on a subset of the
listed items, I would look at some of the listing Controls, ListBox is the first candidate.

Choose its SelectionMode appropriately and provide a single Button to operate on the selected items.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Love, happiness and fewer bugs for 2009!

neodeaths10-Jan-09 4:03

10-Jan-09 4:03

yeah i understand that a listbox or a combo box will be good for it

but unfortunately it must be buttons as its easier to click and its a requirement

Luc Pattyn10-Jan-09 4:07

How to add a MouseHover Event to Label which is created at runtime using C#

10-Jan-09 4:07

Your app could react on a ListBox click too (effectively turning the entire row into one big button);
and you can always disable (or undo) selection mechanisms, if you don't need them.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Love, happiness and fewer bugs for 2009!

K V Sekhar8-Jan-09 21:09

Re: How to add a MouseHover Event to Label which is created at runtime using C#

8-Jan-09 21:09

Hi all,

I am creating labels at runtime and adding into panel.
I wants to create MouseHover Event to Label at runtime
For that i tried in following way.
But its giving Error "No Overload method 'lbl_MouseHover' matches to delegate 'System.EventHandler"..

for (int i = 1; i < 10; i++)
{
Label lbl = new Label();
lbl.AllowDrop = true;
lbl.Size = new Size(50, 16);
lbl.TextAlign = ContentAlignment.MiddleLeft;
lbl.ImageAlign = ContentAlignment.MiddleLeft;
lbl.Name ="lbl_" +i.ToString();

pnl.Controls.Add(lbl);

lbl.MouseHover +=new EventHandler(lbl_MouseHover); //Error

}

public void lbl_MouseHover(object sender, MouseEventArgs e)
{

}

please suggest me where i did wrong.......

Thanks in advance

dan!sh 8-Jan-09 21:25

dan!sh

8-Jan-09 21:25

sekhar.k wrote:
public void lbl_MouseHover(object sender, MouseEventArgs e)

~~MouseEventArgs~~ EventArgs

Thats it.

The word "politics" describes the process so well: "Poli" in Latin meaning "many" and "tics" meaning "bloodsucking creatures."

Re: How to add a MouseHover Event to Label which is created at runtime using C#

K V Sekhar8-Jan-09 23:40

How to Display both image and text in a DataGridview Cell using c#.net

8-Jan-09 23:40

Thanks for your suggestion.
Its worked...

K V Sekhar8-Jan-09 2:52

Re: How to Display both image and text in a DataGridview Cell using c#.net [modified]

8-Jan-09 2:52

Hi all,

I have a requirement of displaying both image and text in a single cell of DataGridview(Windiws Application).

Is this possible ,if yes please suggest me how to approach....

Thanks in advance
cheers,
sekhar

dan!sh 8-Jan-09 3:49

dan!sh

8-Jan-09 3:49

1. Provide padding in the TextboxColumn and then draw the image in the space created in the column using OnPaint.

2. Create your own datagridview column using the existing datagridviewtextboxcolumn class.

The word "politics" describes the process so well: "Poli" in Latin meaning "many" and "tics" meaning "bloodsucking creatures."

modified on Thursday, January 8, 2009 9:56 AM

Re: How to Display both image and text in a DataGridview Cell using c#.net

K V Sekhar8-Jan-09 23:40