Re: Accessing Dynamically Added User Controls - C# Discussion Boards

9-Dec-05 11:19

On my form (MainWindow) I have a TabControl called MonitorTabs. I programmatically add a tab to it for each user I want to monitor. Then I add a user control called Monitor that contains a group of controls including a timer (RefreshTimer) to that tab.

From MainWindow, I call a function that needs to reset the interval on RefreshTimer on the currently selected tab. The number of RefreshTimers is dynamic, one for each User Control/Tab, and I don't know how to access any of them let alone the one that is currently selected. The timer is set to public, and still nothing shows up.

Can anyone help?

Polis Pilavas9-Dec-05 11:58

Polis Pilavas

9-Dec-05 11:58

What you are asking is how to access the currently selected tab? If yes, the following line of code popups a MessageBox with the text of the currently selected tab:

MessageBox.Show(this.tabControl1.SelectedTab.Text);

If I understood otherwise, please try being a bit more specific with your question

Regards,
Polis

Can you practice what you teach?

Mikan239-Dec-05 12:08

9-Dec-05 12:08

Sorry I wasn't clear enough.

On each tab is a user control called Monitor. So if I have three tabs, then there are three Monitors. Monitor has various elements including a timer, a datagridview, a treeview, etc... since they are part of the same user control, they are all named the same.

So for example, I want to set refreshTimer on Monitor on tab 2 (the currently selected tab). How would I access that refreshTimer.

I have tried the following without success

MonitorTabs.SelectedTab.Monitor.refreshTimer<br />
MonitorTabs.SelectedTab.refreshTimer<br />
MonitorTabs.TabPages[MonitorTabs.SelectedIndex].Monitor.refreshTimer

Thanks

Polis Pilavas9-Dec-05 12:15

Polis Pilavas

9-Dec-05 12:15

Hmm... if I get it right, I would keep track of each Monitor's instance name on each tab (e.g. I would add "Monitor1" on tab1, "Monitor2" on tab2 and so on. Then, in order to access them, I would locate them by their names).

Regards,
Polis

Can you practice what you teach?

Mikan239-Dec-05 12:27

9-Dec-05 12:27

That makes sense but I've never tried that before (somewhat new at this), could you demonstrate please? This is my current code.

TabPage newMonitorTab = new TabPage(TabTitle);<br />
MonitorTabs.TabPages.Add(newMonitorTab);<br />
            <br />
MonitorTab monitor = new MonitorTab();<br />
newMonitorTab.Controls.Add(monitor);

Thanks!

Polis Pilavas9-Dec-05 12:46

Polis Pilavas

9-Dec-05 12:46

You could write something like this:

// Add "monitor1" on tab1
TabPage tab1 = new TabPage("Tab 1");
MonitorTabs.TabPages.Add(tab1);

MonitorTab monitor1 = new MonitorTab();
tab1.Controls.Add(monitor1);


// Add "monitor2" on tab2
TabPage tab2 = new TabPage("Tab 2");
MonitorTabs.TabPages.Add(tab2);

MonitorTab monitor2 = new MonitorTab();
tab2.Controls.Add(monitor2);

// And so on...

This way, you know that tab1 has monitor1 on it, and tab2 has monitor2. So if the selectedTab is tab1 then you access monitor1 by writing something like this.monitor1

Hope this makes sense.

Regards,
Polis

Can you practice what you teach?

Mikan239-Dec-05 13:09

9-Dec-05 13:09

Its getting closer, I have added them and can access them to a point using the following:

MonitorTab monitor = new MonitorTab();<br />
monitor.Name = "Monitor" + MonitorTabs.TabPages.Count.ToString();

But I still can't access that control except using a foreach looping through the controls on the tab, which doesn't allow me to access the timer. Any suggestions?

[Marc]9-Dec-05 13:52

[Marc]

9-Dec-05 13:52

You can also make an hashtable, like [Tab] - [Monitor]:

private HashTable monitors = new HashTable();

MonitorTab GetMonitor(TabPage tab) {
  return (MonitorTab) monitors(tab);
}

void AddTab() {
  TabPage newMonitorTab = new TabPage(TabTitle);
  MonitorTabs.TabPages.Add(newMonitorTab);

  MonitorTab monitor = new MonitorTab();
  newMonitorTab.Controls.Add(monitor);

  monitors.Add(newMonitorTab, monitor);
}

// Then you can do:
MonitorTab selectedMonitor = GetMonitor(this.tabControl1.SelectedTab);

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Mikan239-Dec-05 14:05

String functions like C and VB

9-Dec-05 14:05

That worked great! Thank you both! *sigh of relief*

GlennP.9-Dec-05 9:09

9-Dec-05 9:09

Hi, can anyone help I need a string manipulation to do the same as Len(in VB) or strlen()in C as well as Mid$ in VB or strstr()in C. This is to allow me to pick off bits in a string to send them to the RS232 Smile | :)

Doh!

-- modified at 15:17 Friday 9th December, 2005

Wjousts9-Dec-05 9:16

Wjousts

9-Dec-05 9:16

Look at the String class[^] in MSDN. All you need to know.

GlennP.9-Dec-05 9:20

9-Dec-05 9:20

I tried that it comes up with LEN which I can't get to work, or is it something like string.LEN, I am a little desperate!
Glenn

Doh!

Colin Angus Mackay9-Dec-05 9:55

Colin Angus Mackay

9-Dec-05 9:55

What!? Where? No where in the linked page is there a LEN() or string.LEN

string myString = "Some text";
myString.Length

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Wjousts9-Dec-05 10:06

Wjousts

9-Dec-05 10:06

GlennP. wrote:
I tried that it comes up with LEN which I can't get to work

What are you talking about? Where on the link I posted did it mention LEN? It did quite clearly mention Length and Substring which can be used in place of Len and Mid from VB. So what's the problem?

GlennP.10-Dec-05 4:35

10-Dec-05 4:35

I am sorry I was using the MSDN that came with the version of .NET which is different from the from the online version, All I can say is a nights sleep is required at least once a week!! sorry! Smile | :)

Doh!

Dave Kreskowiak10-Dec-05 5:11

Dave Kreskowiak

10-Dec-05 5:11

The one that can with Visual Studio .NET doesn't mention LEN either! Are you sure you were looking at the .NET version or the older VB6 version?

RageInTheMachine9532
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Nish Nishant9-Dec-05 10:30

Nish Nishant

9-Dec-05 10:30

If you use VC++ 2005, you can access the .NET libraries as well as use your favorite C and C++ stuff (like strstr or std::string).

GlennP.10-Dec-05 4:38