Child window can't be moved or closed

Question

2.00/5 (1 vote)

See more:

I have a C# winForm app that spawns a child window...my users have 4 or more monitors and whenever they move the child window to the one of the other monitors they can't move or close the child window. the mouse pointer takes on the shape of 'double arrows' as though it's in resize mode

Does anyone have any idea what's going on here? I've never had this issue before when spawning child windows.

Posted 9-May-12 5:20am

d.allen101

Updated 9-May-12 5:40am

v3

Add a Solution

Comments

Sergey Alexandrovich Kryukov 9-May-12 11:56am

No, they are not child window. The child-parent relationship is effectively made defunct for forms, in contrast to controls.
How can we see where your problem is?
Could you make a complete but short code sample manifesting this problem?
--SA

BobJanova 9-May-12 12:06pm

nice triple post there SAK ;)

Sergey Alexandrovich Kryukov 9-May-12 12:13pm

Site malfunction. Let's see how delete works -- Chris promised improvements... :-)
--SA

BobJanova 9-May-12 12:08pm

I doubt this is to do with parent/child windows (although as SAK hints at, it's actually 'owner/owned' with forms in .Net, parent/child is strictly a different thing). Most likely you are doing something in the wrong thread and either stalling the UI thread or trying to do UI interactions in another thread.

If you can create a simple example which fails for you, without any external dependencies or 'clever code', that would be interesting. My suspicion is that in the process of making such an example you will discover which component of your application is responsible for this weird side effect.

Sergey Alexandrovich Kryukov 9-May-12 12:16pm

Yes, owner/owned should be used, but many neglect it. Formally there is also a Parent property -- works for all controls but forms, throws exception unless you assign false to TopLevel, which would produce the ugliest result. I agree, weird stuff is most likely the result of weird code.
--SA

Shahin Khorshidnia 9-May-12 14:05pm

Yes SA, one day you disabused me too.

Sergey Alexandrovich Kryukov 9-May-12 17:23pm

What do you mean? when?
--SA

Shahin Khorshidnia 12-May-12 2:37am

Don't you remember? But I never forget this lesson and thank you:) : http://www.codeproject.com/Answers/353258/How-to-show-date-time-picker-in-form2#answer1

Sergey Alexandrovich Kryukov 14-May-12 15:41pm

You reminded me, thank you; there was a number of cases like that. Using this occasion, I would like to say: this is such a pleasure to see a person like you, who uses criticism to fix the problems, get better knowledge, etc. There are way too many cases when people do not accept criticism and behave aggressively. Criticism is one of the critical tools in science, arts and technology; in response to it, a decent person either tries to proof her/his point or improve herself/himself, or do the combination of both. It's sad that so many people do not understand it.
--SA

Shahin Khorshidnia 15-May-12 0:11am

Yes SA, and thank you :)

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

A-s-h-l-e-y · Answer 1 · 2012-05-09T17:03:00

Solution 1

I created a multi screen app and found the solution was to create the child windows as separate forms in the designer then use them as an array so child[] c = new child[3];
Then you can pass the relevant data to each form through for(int i,i==3,i++){c[i].text="example";}

Posted 9-May-12 17:03pm

A-s-h-l-e-y

Updated 9-May-12 17:04pm

v3

d.allen101 · Answer 2 · 2012-05-14T18:16:00

Solution 2

moved form worker thread to main thread

Posted 14-May-12 18:16pm

d.allen101