HOW DO I ADD THE SAME EXPANDER MULTIPLE TIMES TO A STACK PANEL IN WPF

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HOW DO I ADD THE SAME EXPANDER MULTIPLE TIMES TO A STACK PANEL IN WPF
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;
using MotionControl.PropertiesForms;

namespace MotionControl
{
///

/// Interaction logic for MainWindow.xaml
///

public partial class MainWindow : Window
{

public MainWindow()
{

InitializeComponent();

DispatcherTimer timer1 = new DispatcherTimer();
timer1.Interval = TimeSpan.FromSeconds(1);
timer1.Tick += timer_Tick;
timer1.Start();
}
void timer_Tick(object sender, EventArgs e)
{

if (MicroPosition.Default.DeviceName == "Micro Position Control")
{

expander2.Visibility = Visibility.Visible;

// create new tab item

// add controls to tab item, this case I added just a textbox

stackpanel1.Children.Add(expander2);

}
else if (MicroPosition.Default.DeviceName == "Temperature Sensor")
{
Display dis = new Display();

expander3.Visibility = Visibility.Visible;
if (MicroPosition.Default.DeviceName == "Temperature Sensor")
{
for (int i = 0; i <= 15; i++)
{
if (i > 0)
{
stack.Children.Add(expander3);
}
}

}
else if (MicroPosition.Default.DeviceName == "New Devices")
{
expander4.Visibility = Visibility.Visible;
stack.Children.Add(expander4);

}

}

}
}
}

Posted 23-Apr-15 21:04pm

Member 11521909

Updated 23-Apr-15 21:08pm

v2

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Comments

Sergey Alexandrovich Kryukov 24-Apr-15 3:23am

Why?
—SA

1 solution

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Sergey Alexandrovich Kryukov · Accepted Answer · 2015-04-23T21:21:00

Solution 1

This is a special feature of WPF: no object can be added more than once to the logical tree of the whole UI (see also: https://msdn.microsoft.com/en-us/library/ms753391%28v=vs.110%29.aspx[^]).

On attempt to add a reference to the same UI element in more than two places in the UI, an exception will be thrown. If you want to add several expanders, you have to create several different instances of System.Windows.Controls.Expander.

—SA

Posted 23-Apr-15 21:21pm

Sergey Alexandrovich Kryukov

Updated 23-Apr-15 21:23pm

v2

Comments

Member 11521909 24-Apr-15 3:31am

how do u create those instances? will i be able to create the expanders with the same content in it?

Sergey Alexandrovich Kryukov 24-Apr-15 3:39am

In a usual way, via the constructor; or XAML will do it for you.
—SA

Member 11521909 24-Apr-15 3:49am

if it is not much of a trouble for u, could u type down the code

Sergey Alexandrovich Kryukov 24-Apr-15 3:59am

Sure:
var expander1 = new System.Windows.Controls.Expander();
var expander2 = new System.Windows.Controls.Expander();
//...
somePanel.Children.Add( // for example,
expander1);
somePanel.Children.Add(expander2);
//...

But what's wrong with using XAML? Perhaps, variable number of UI elements changing during runtime?...

—SA

Member 11521909 24-Apr-15 3:33am

the expander name is micro position controller n it appears on clicking a button n i want another expander by the name micro position controller2 on clicking the same button with the same content in it. is that possible?

Sergey Alexandrovich Kryukov 24-Apr-15 3:44am

Not clear; needs explanations. But you can have as many expanders as seem to be reasonable. Aren't you trying to create a behavior like that of Visual Studio Toolbox, showing and hiding different sections?

Another idea would be using TreeView instead of multiple Extenders. Essentially, it will be much easier and more flexible. And WPF allows you to keep absolutely any UI elements in nodes, not just texts.

—SA

Member 11521909 24-Apr-15 3:58am

i'm actually trying to create something similiar to lab view. so those expanders are devices n the content in them are the commands for the devices. on choosing the device name from a combo box belonging to a form n clicking the ok button the expander appears.What i have to do now is when i choose the device name again n click the ok button i want the same exapnder to appear with a change in name(micro position control 2)

Sergey Alexandrovich Kryukov 24-Apr-15 4:09am

It's not an adequate use of expanders; they are designed to save a room on the screen, to hide some detail. If you explain the semantic of the on-screen device, we could discuss the UI design, but it would take a separate question. If you post such question and want me to participate, please leave me a link in a comment to this comment.

(And by the way, I don't know anything worse then Lab View. The whole idea is disastrous. One of my first computer-science conference presentation was anti-lab view, attracted certain interest; many people I talked with tend to agree with me... :-)

—SA

Member 11521909 25-Apr-15 0:54am

I know, but what can I say, the boss wants me to do it the lab view way. I have no clue on this, I,m just a beginner. if u could give me your email id i could mail u the code so that u could help me complete the program. Hope u don't mind that. If its too much of a trouble for u i'll try finding alternative ways. I appreciate what u have done for me so far. Thank you!!

Sergey Alexandrovich Kryukov 25-Apr-15 5:44am

You are welcome.
Good luck, call again.
—SA

Member 11521909 24-Apr-15 3:35am

or is it possible to create a tabs inside the expanded region of an expander

Sergey Alexandrovich Kryukov 24-Apr-15 3:41am

Expander can work as a container for any UI elements. You can use TabControl inside it, if you want.
Perhaps you need me to help you to do the UI design, then you need to ask a question explaining the design goals...
—SA