Hello, I was wondering if there was a way to check there was already a
form open before opening a new one, sorry that doesnt seem clear, here
is an example:
The following button opens a new form
private void btnAbout_Click( object sender, EventArgs e)
{
avernusAbout About = new avernusAbout();
About.StartPosi tion = FormStartPositi on.Manual;
About.Location = new Point(this.Loca tion.X,
this.Location.Y );
About.Show();
this.Hide();
}
is there a way to check if the form is already open before It opens the
new form?
Any help would be greatly appreciated 9 41661
If you are using .NET 2.0, use Application.Ope nForms as in:
foreach (Form a in Application.Ope nForms)
{
if (a is avernusAbout)
{
// About form is open
break;
}
// About form is not open...
}
<Ke*******@gmai l.comwrote in message
news:11******** **************@ i42g2000cwa.goo glegroups.com.. .
Hello, I was wondering if there was a way to check there was already a
form open before opening a new one, sorry that doesnt seem clear, here
is an example:
The following button opens a new form
private void btnAbout_Click( object sender, EventArgs e)
{
avernusAbout About = new avernusAbout();
About.StartPosi tion = FormStartPositi on.Manual;
About.Location = new Point(this.Loca tion.X,
this.Location.Y );
About.Show();
this.Hide();
}
is there a way to check if the form is already open before It opens the
new form?
Any help would be greatly appreciated
Maybe I should have provided you with a tad bit more information, what
I needed to do if the form was currently open is show it. How could I
go about doing that?
Siva M wrote:
If you are using .NET 2.0, use Application.Ope nForms as in:
foreach (Form a in Application.Ope nForms)
{
if (a is avernusAbout)
{
// About form is open
break;
}
// About form is not open...
}
<Ke*******@gmai l.comwrote in message
news:11******** **************@ i42g2000cwa.goo glegroups.com.. .
Hello, I was wondering if there was a way to check there was already a
form open before opening a new one, sorry that doesnt seem clear, here
is an example:
The following button opens a new form
private void btnAbout_Click( object sender, EventArgs e)
{
avernusAbout About = new avernusAbout();
About.StartPosi tion = FormStartPositi on.Manual;
About.Location = new Point(this.Loca tion.X,
this.Location.Y );
About.Show();
this.Hide();
}
is there a way to check if the form is already open before It opens the
new form?
Any help would be greatly appreciated
Ke*******@gmail .com wrote:
Maybe I should have provided you with a tad bit more information, what
I needed to do if the form was currently open is show it. How could I
go about doing that?
Why not make the Form a singleton? Something like this:
public class MyForm : System.Windows. Forms.Form
{
private static MyForm _instance = null;
private void MyForm()
{
... usual constructor stuff ...
}
public MyForm Instance
{
get
{
if (MyForm._instan ce == null)
{
MyForm._instanc e = new MyForm();
}
return MyForm._instanc e;
}
}
}
Now, whenever you want to show the form, just say:
MyForm.Instance .Show();
No need to search, and it works in .NET 1.1 and 2.0. Will that work for
you?
Bruce, I am not sure how to implement that singleton, however I will do
some research on the subject, thankyou all for your help
Bruce Wood wrote:
Ke*******@gmail .com wrote:
Maybe I should have provided you with a tad bit more information, what
I needed to do if the form was currently open is show it. How could I
go about doing that?
Why not make the Form a singleton? Something like this:
public class MyForm : System.Windows. Forms.Form
{
private static MyForm _instance = null;
private void MyForm()
{
... usual constructor stuff ...
}
public MyForm Instance
{
get
{
if (MyForm._instan ce == null)
{
MyForm._instanc e = new MyForm();
}
return MyForm._instanc e;
}
}
}
Now, whenever you want to show the form, just say:
MyForm.Instance .Show();
No need to search, and it works in .NET 1.1 and 2.0. Will that work for
you?
Ke*******@gmail .com wrote:
Maybe I should have provided you with a tad bit more information, what
I needed to do if the form was currently open is show it. How could I
go about doing that?
To use the previous poster's example (which is a good one):
foreach (Form a in Application.Ope nForms)
{
if (a is avernusAbout)
{
a.TopMost = true; // Moves it to the top of the window stack
// or (if it is simply not visible)
a.Visible = true;
}
// About form is not open...
}
Matt
KelsMckin,
Bruce just provided you with a complete working code example of how to do it
as a singleton. All you have to do it try it. There are certainly other ways,
but I'd vote for Bruce's example as being both elegant and simple.
Peter
--
Co-founder, Eggheadcafe.com developer portal: http://www.eggheadcafe.com
UnBlog: http://petesbloggerama.blogspot.com
"Ke*******@gmai l.com" wrote:
Bruce, I am not sure how to implement that singleton, however I will do
some research on the subject, thankyou all for your help
Bruce Wood wrote:
Ke*******@gmail .com wrote:
Maybe I should have provided you with a tad bit more information, what
I needed to do if the form was currently open is show it. How could I
go about doing that?
Why not make the Form a singleton? Something like this:
public class MyForm : System.Windows. Forms.Form
{
private static MyForm _instance = null;
private void MyForm()
{
... usual constructor stuff ...
}
public MyForm Instance
{
get
{
if (MyForm._instan ce == null)
{
MyForm._instanc e = new MyForm();
}
return MyForm._instanc e;
}
}
}
Now, whenever you want to show the form, just say:
MyForm.Instance .Show();
No need to search, and it works in .NET 1.1 and 2.0. Will that work for
you?
Matt's code should do the trick.
<Ke*******@gmai l.comwrote in message
news:11******** **************@ p79g2000cwp.goo glegroups.com.. .
Maybe I should have provided you with a tad bit more information, what
I needed to do if the form was currently open is show it. How could I
go about doing that?
Siva M wrote:
If you are using .NET 2.0, use Application.Ope nForms as in:
foreach (Form a in Application.Ope nForms)
{
if (a is avernusAbout)
{
// About form is open
break;
}
// About form is not open...
}
<Ke*******@gmai l.comwrote in message
news:11******** **************@ i42g2000cwa.goo glegroups.com.. .
Hello, I was wondering if there was a way to check there was already a
form open before opening a new one, sorry that doesnt seem clear, here
is an example:
The following button opens a new form
private void btnAbout_Click( object sender, EventArgs e)
{
avernusAbout About = new avernusAbout();
About.StartPosi tion = FormStartPositi on.Manual;
About.Location = new Point(this.Loca tion.X,
this.Location.Y );
About.Show();
this.Hide();
}
is there a way to check if the form is already open before It opens the
new form?
Any help would be greatly appreciated
a.TopMost = true; // Moves it to the top of the window stack
IIRC, this toggles the "always on top" behaviour; a combination of
Activate(), Focus() and BringToFront() would probably be more in order,
otherwise the user could find it hard to get rid of the form (to the
background) afterwards.
Marc
Bruce Wood wrote:
[...]
Why not make the Form a singleton? Something like this:
[...]
This will work if there'll only ever be one instance of that form. But
sometimes, you'll have to make sure there's only one instnce of a certain
form per business object, e. g. to open a customer form once per customer
and bring it to top otherwise.
We're keeping a Dictionary of our opened forms with a combination of form
class name and business object id as a key and look it up whenever we want
to open a new view, then proceed pretty much as you did... This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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