Re: Windows Form does not show if created in other thread - C# Discussion Boards

Re: Windows Form does not show if created in other thread

20-Jul-09 4:27

Tank you very much, but I need to pass some parameters to my Form Object. Methodinvoker does not support this - how can I solve this problem?

DaveyM6920-Jul-09 4:41

DaveyM69

20-Jul-09 4:41

It can be done like this

BeginInvoke(new MethodInvoker(
 delegate() { method(parameters); }) );

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
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Re: Windows Form does not show if created in other thread

gehbitte20-Jul-09 4:59

Re: Windows Form does not show if created in other thread

20-Jul-09 4:59

Tank you but somehow this won't work - BeginInvoke is not recognized from VS...

gehbitte20-Jul-09 5:04

Re: Windows Form does not show if created in other thread

20-Jul-09 5:04

It works when I implement the function

private void BeginInvoke(MethodInvoker methodInvoker)
       {
           methodInvoker.Invoke();
       }

but the form is also not shown.

For the glimpse of a second I see another window in the taskbar but it disappears almost instantly.

gehbitte20-Jul-09 5:40

Re: Windows Form does not show if created in other thread

20-Jul-09 5:40

Ok I found out that when I stay in the method where the Form was created with the simple command

while (Program.buywindow_open)
           {
               Thread.Sleep(10);
           }

the window is shown, but not responding....

DaveyM6920-Jul-09 7:51

DaveyM69

20-Jul-09 7:51

That's because as soon as the form is shown the thread is done and so the form closes, here you're just delaying it by 10ms. What you need is the thread to not end until the form closes.

I'm no expert in threading, I know nothing apart from the principles, so treat these ideas with great caution!

You can call ShowDialog() instead of Show() as it doesn't return until the form is closed so it will stay open and be responsive, but not act as a Dialog to the form on the main thread.

void OpenBuyWindow()
{
    Form form = new Form();
    form.ShowDialog();
}

An ugly (maybe dangerous?) alternative is to replicate what happens in the Program.cs

void OpenBuyWindow()
{
    Application.Run(new Form());
}

Re: Windows Form does not show if created in other thread

gehbitte20-Jul-09 21:41

Re: Windows Form does not show if created in other thread

20-Jul-09 21:41

Many thanks! Form.ShowDialog works!

Luc Pattyn20-Jul-09 3:51

Horizontal ScrollBar does not work in the TextBox control... anymore.

20-Jul-09 3:51

gehbitte wrote:
Why?

Controls (a Form is a Control) can only be operated upon by the thread that creates them, as they are not thread-safe. Controls reside in Forms, and Forms are interconnected in many ways (Parent, z-order, etc). The net result is all Controls need to be created and operated upon by the main thread only; for anything else you need to use Control.Invoke

Smile | :)

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iscript20-Jul-09 3:21

Re: Horizontal ScrollBar does not work in the TextBox control... anymore.

20-Jul-09 3:21

I was just wondering if anybody knows how to fix the scrollbar problem with the TextBox control in WinForms. When I set ScrollBars.Horizontal, it still doesn't show up, even when the text extends the width of the textbox.

Here's the code I'm using:

t.ScrollBars = ScrollBars.Horizontal;

I've searched on Google, Bing and MSDN, but all I keep seeing are Custom TextBox control's made by other people which is not what I'm after. I'm not opposed to the idea, but all I really want is to use a simple, standard control. Has anybody had this sort of problem before?

DaveyM6920-Jul-09 3:31

DaveyM69

20-Jul-09 3:31

It'll only work if Multiline is true and WordWrap is false.

Re: Horizontal ScrollBar does not work in the TextBox control... anymore.

iscript20-Jul-09 3:39

Re: Horizontal ScrollBar does not work in the TextBox control... anymore.

20-Jul-09 3:39

Sorry DaveyM69 I should have also mentioned that WordWrap is false and that Multiline is also set to true. MKy bad. Thanks for your response though.

stancrm20-Jul-09 3:31

stancrm

20-Jul-09 3:31

Have you ever tried to stay at one topic, no repost...!!!

Read MSDN : http://msdn.microsoft.com/en-us/library/system.windows.forms.textbox.scrollbars.aspx[^]

Set WordWrap = false, then you can see your ScrollBars.Horizontal

Re: Horizontal ScrollBar does not work in the TextBox control... anymore. [modified]

iscript20-Jul-09 3:43

Re: Horizontal ScrollBar does not work in the TextBox control... anymore.

20-Jul-09 3:43

Don't make accusations based on bullshi7. I only created this account no more than an hour ago. Idiot. I have not re-posted anything, ever.

modified on Monday, July 20, 2009 9:49 AM

Luc Pattyn20-Jul-09 3:53

Re: Horizontal ScrollBar does not work in the TextBox control... anymore.

20-Jul-09 3:53

iscript wrote:
Don't make accusations based on bullshi7. ... Idiot.

Nice one. You want to become popular right away?

Unsure | :~

Luc Pattyn [Forum Guidelines] [My Articles]

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iscript20-Jul-09 4:28

Re: Horizontal ScrollBar does not work in the TextBox control... anymore.

20-Jul-09 4:28

I'm sorry Luc, I don't mean to offend you, or
anybody
for that matter, but I stand by my statement. I'm not proud of what I said, but I don't like being accused of doing something that I haven't done. I've been accused of such things in the past on other forums and won't tolerate it anymore.

I completely understand that if a message hasn't been answered right away that obviously other people don't know the answer OR don't feel like replying OR are too busy OR etc etc... Nobody on here has to give help. And I understand that.

What I don't understand is how someone could accuse me of re-posting when it obviously isn't the case.

Anyway, I think I might go and find another forum or something where I feel more relaxed and don't get accused of reposting.

Luc Pattyn20-Jul-09 4:45

Re: Horizontal ScrollBar does not work in the TextBox control... anymore.

20-Jul-09 4:45

Hi iscript,

chill out man. the reply you've got earlier probably was ill-advised. However that is no reason for name calling; we do get a lot of new members who are not familiar with the site rules, and start posting similar questions everywhere and all the time; and create several accounts for no good reasons. So we sometimes are on the defensive here.

I hope you'll get answers to your questions, and you learn to value this site, as CodeProject is a wonderful community.

Cheers.

Luc Pattyn [Forum Guidelines] [My Articles]

The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Show formatted code inside PRE tags, and give clear symptoms when describing a problem.

iscript20-Jul-09 4:58

Re: Horizontal ScrollBar does not work in the TextBox control... anymore.

20-Jul-09 4:58

Thank you Luc, for making me feel welcome.

I'm sorry to hear that you're (C.P Members) on the defensive at times due to similar questions. That must be irritating. I'll be on my best behavior from now on. I'm going to apologize to that person now.

Thanks
Smile | :)

Luc Pattyn20-Jul-09 5:09

Re: Horizontal ScrollBar does not work in the TextBox control... anymore.

20-Jul-09 5:09

Luc Pattyn [Forum Guidelines] [My Articles]

The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Show formatted code inside PRE tags, and give clear symptoms when describing a problem.

iscript20-Jul-09 5:04

Re: Horizontal ScrollBar does not work in the TextBox control... anymore.

20-Jul-09 5:04

Hi Stancrm,

Thanks for the link. I should have mentioned in my original post that I already had Word-Wrap set to false and Multiline set to true, I completely forgot to mention it. As for my insult, I'm sorry I lashed out at you like I did, it wasn't very nice. I'm sorry.

Smile | :)

iScript.

OriginalGriff20-Jul-09 3:32

OriginalGriff

20-Jul-09 3:32

iscript wrote:
I've searched on Google, Bing and MSDN

You didn't search too hard then - its on MSDN: http://msdn.microsoft.com/en-us/library/system.windows.forms.textbox.scrollbars.aspx[^]

It says that Horizontal scroll bars are only avaiable when Wordwrap is set to false. So, either you have wordwrap on, or you have multiline off - in which case there is no space for a scroll bar so you don't get one either.

No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.

This message is made of fully recyclable Zeros and Ones

Re: Horizontal ScrollBar does not work in the TextBox control... anymore.

iscript20-Jul-09 3:45

Re: Horizontal ScrollBar does not work in the TextBox control... anymore.

20-Jul-09 3:45

I have multiline set to true and wordwrap set to false. The horizontal scrollbar has always worked. But for some reason it doesn't work anymore. It never shows up.

PIEBALDconsult20-Jul-09 5:06

PIEBALDconsult

20-Jul-09 5:06

I just tried it (VS 2008 SP1) and I got it/them. As long as you also allowed space for the scroll bar.

Re: Horizontal ScrollBar does not work in the TextBox control... anymore.

iscript20-Jul-09 5:15