Is there a good example of using multiple forms.....

glennPattonPub

Hi, Does anybody know of a good example of using variables between multiple forms. I am in need of one as I could do it and now I can't (get, set and the rest!) Glenn

phil o

Maybe you could start here[^]

glennPattonPub

Great, thanks for that. But I'm looking for a way that Form1 can call up Form2, Form2 then has data that is passed back to Form1. Most of the methods I (yours included) Form1 passes the data to Form2 and not the other way I was looking at trying to alterone your methods to that but have come unstuck, is Properties approach the way to go or not and what is the overhead? All I'm think of doing is inputting three ints and away. Glenn

Henry Minute

I don't know if this will help: Getting User Input With Dialogs Part 1[^] Getting User Input From Dialogs - Part 2[^] If at all Part 2 is more likely to be useful.

Henry Minute Do not read medical books! You could die of a misprint. - Mark Twain Girl: (staring) "Why do you need an icy cucumber?" “I want to report a fraud. The government is lying to us all.”

DaveyM69

Have a look at my tip[^] then my article[^] for a more complete tutorial.

Dave

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Binging is like googling, it just feels dirtier. Please take your VB.NET out of our nice case sensitive forum.(Pete O'Hanlon)
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

realJSOP

Instead of doing it that way, you could just setup a static object that contains your data, and use that object in all of the forms. That way, when one form sets the data, the other form can read it, and change it as well.

.45 ACP - because shooting twice is just silly
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The Man from U N C L E

If you use ShowDialog to display Form2 then after it has closed all the properties of Form2 are available to you until the instance is disposed, or goes out of scope.

If you have knowledge, let others light their candles at it. Margaret Fuller (1810 - 1850) [My Articles] [My Website]

AussieLew

DaveyM69 wrote:

then my article[^] for a more complete tutorial

Had reason to use this recently, a very helpful article from a helpful guy. Thanks again Dave!

DaveyM69

:thumbsup:

Dave

If this helped, please vote & accept answer!

Binging is like googling, it just feels dirtier. Please take your VB.NET out of our nice case sensitive forum.(Pete O'Hanlon)
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

glennPattonPub

Hi, Thanks for that it works one way Form1 to Form2, I am trying to get Form2 to Form1 (Don't ask Tower of Babel situation). Now I am trying the method for Form1 to Form2 reversed and running into problems. Very unpolitical correct give me Global variables back I promise not to abuse them !(like I did) Glenn

AussieLew

Sounds similar to what I wanted to do. Form2 needed to set a menuitem on Form1. this was done by creating the event in Form2 registering the handler in Form1. Form 2 also needed to know the status of some menuitems in Form1. This was done by creating the event in Form2 with and registering the handler in Form1. This handler sets one of the custom eventargs properties and returns them to Form2. It was a combination of Daves examples. I'm sure DaveyM69 will explain it more succintly! Thread of my question is Here may help.

glennPattonPub

Great

DaveyM69

Hi, sorry for the delay in getting back. I'm having a busy day at work X| It seems AussieLew has guided you through. If you need any more help feel free to post back and I will have a look tonight (UK) if you are stuck or unsure.

Dave

If this helped, please vote & accept answer!

Binging is like googling, it just feels dirtier. Please take your VB.NET out of our nice case sensitive forum.(Pete O'Hanlon)
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

glennPattonPub

He has helped but I still need a little guidance as it all seems to be forward and not backward passing. Thanks Glenn

DaveyM69

glennPattonWork wrote:

all seems to be forward and not backward passing

No. Have a look at this exmple that does exactly what you want. Anything you don't understand, just ask!

// ThreeIntsEventArgs.cs
/* Arguments and delegate for FormChild.ThreeIntsEvent */

using System;

public delegate void ThreeIntsEventHandler(object sender, ThreeIntsEventArgs e);

public class ThreeIntsEventArgs : EventArgs
{
private int x;
private int y;
private int z;

public ThreeIntsEventArgs(int x, int y, int z)
{
    this.x = x;
    this.y = y;
    this.z = z;
}

public int X
{
    get { return x; }
}
public int Y
{
    get { return y; }
}
public int Z
{
    get { return z; }
}

}

// FormChild.cs
/* Click OK to raise event sending the three values */

using System.Drawing;
using System.Windows.Forms;

public partial class FormChild : Form
{
public event ThreeIntsEventHandler ThreeInts;

private NumericUpDown numericUpDownX;
private NumericUpDown numericUpDownY;
private NumericUpDown numericUpDownZ;
private Button buttonOK;

public FormChild()
{
    InitializeComponent();
    // numericUpDownX
    numericUpDownX = new NumericUpDown();
    numericUpDownX.Location = new Point(12, 12);
    // numericUpDownY
    numericUpDownY = new NumericUpDown();
    numericUpDownY.Location = new Point(12, 36);
    // numericUpDownZ
    numericUpDownZ = new NumericUpDown();
    numericUpDownZ.Location = new Point(12, 60);
    // buttonOK
    buttonOK = new Button();
    buttonOK.Text = "OK";
    buttonOK.Location = new Point(12, 84);
    buttonOK.Click += new System.EventHandler(buttonOK\_Click);
    // Add controls
    Controls.AddRange(new Control\[\] { numericUpDownX, numericUpDownY, numericUpDownZ, buttonOK });
    AcceptButton = buttonOK;
}

private void buttonOK\_Click(object sender, System.EventArgs e)
{
    OnThreeInts(new ThreeIntsEventArgs((int)numericUpDownX.Value, (int)numericUpDownY.Value, (int)numericUpDownZ.Value));
}
protected virtual void OnThreeInts(ThreeIntsEventArgs e)
{
    ThreeIntsEventHandler eh = ThreeInts;
    if (eh != null)
        eh(this, e);
}

}

// FormParent.cs
/* Click the Form tho open a new ch

glennPattonPub

Hi, I have had a fiddle it seems a little over compliated at the moment. I have a simpler method using the Panel component with three text boxe sand a button click to make the panel visible, once the variables are entered the panel is made invisible the values can be recorded. What the opinion of that? I have tried in a demo App does look too bad. Glenn

DaveyM69

If it works for you then cool :cool: I don't see how that helps you get values from one form to another though :confused: I'm planning another article that will be a bit more light hearted so more accessible on various OOP techniques/patterns including events/delegates (Observer Pattern). I'll post here when it's published, which will probably be a couple of weeks, as you may find it useful.

Dave

If this helped, please vote & accept answer!

Binging is like googling, it just feels dirtier. Please take your VB.NET out of our nice case sensitive forum.(Pete O'Hanlon)
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

DaveyM69

So you (and others) can see how simple events really are to create, I have posted a simple tip here[^].

Dave

If this helped, please vote & accept answer!

Binging is like googling, it just feels dirtier. Please take your VB.NET out of our nice case sensitive forum.(Pete O'Hanlon)
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)