Solved

Messagebox.showdialog() and multithread

Posted on 2006-11-06
2
2,696 Views
Last Modified: 2012-08-13
Hello. In my c# app I want to use a Form as a dialog showing progress of time consuming operation. I mean:
I have the mainform, running on the unique main thread. When user click button a long update of data to a remote webservice is launched. I want the following beahvior: user click button, data update runs on the main thread (cause it update main form objects too); while the webservice is running I want that a form dialog is shown to the user (running on a second thread). The form will contain a progressbar update with the progress of the application. When the webservice finished, the second form will close. Here is my code:

//..main Thread:
System.Threading.Thread TR1 = new System.Threading.Thread(u);
Italia(); // <-- Webservice taking long time
TR1.Start();

private void u()
        {
            int y = this.Location.Y;
            int nav = ((SisCos)MdiParent).NavTree.Width;
            int parentlocx = this.MdiParent.Location.X;
            int parentlocy = this.MdiParent.Location.Y;
            Point pnt = new Point(parentlocx + nav + 5, parentlocy + y + 10);

            SisCosExplorer.UIsVarie.MessBoxSisCos MB = new SisCosExplorer.UIsVarie.MessBoxSisCos(); // <-- Derived from Form class: it's a form without border
            MB.Height = Convert.ToInt16(System.Math.Round(this.Height * .95, 0));
            MB.Width = Convert.ToInt16(System.Math.Round(this.Width * .95, 0));
            MB.Location = pnt;

            MB.ShowDialog();
        }

It' s all working great except for one thing: The second form (MB) it's not working like a dialog (even if i call MB.Showdialog). I mean, if the user click on the main form, main form is focused. And I don't want it at all cause the webservice it's uplaoding the main form. I think it's a thread problem. What can I do to make MB working like a real Dialog?
Thanks in advance
0
Comment
Question by:puckkk
2 Comments
 
LVL 48

Accepted Solution

by:
AlexFM earned 500 total points
ID: 17881021
This happens because you show modal dialog in the worker thread. Dialog is modal only inside of thread which created it.
General approach is creating all UI elements in the main thread, and running worker thread in background. Worker thread doesn't have any UI elements. It can pass progress and any other information to UI using Invoke or BeginInvoke methods:
http://www.codeproject.com/csharp/workerthread.asp

If you want to continue with your current approach, try to disable main form for the time when MB dialog is active. This can prevent main form to be activated by mouse (I didn't test this because I always use first way to run threads).
0
 

Author Comment

by:puckkk
ID: 17888707
I used the first (and best) way reading the article. That's exactyl what i neede. Thx a lot.
0

Featured Post

Gigs: Get Your Project Delivered by an Expert

Select from freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely and get projects done right.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
C# Offline Apllication 5 70
Signal R -send data to client: only if they are allowed to see it ? 1 49
Video Player 2017 5 20
Expression Evaluater 3 24
Article by: Najam
Having new technologies does not mean they will completely replace old components.  Recently I had to create WCF that will be called by VB6 component.  Here I will describe what steps one should follow while doing so, please feel free to post any qu…
This article describes a simple method to resize a control at runtime.  It includes ready-to-use source code and a complete sample demonstration application.  We'll also talk about C# Extension Methods. Introduction In one of my applications…
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

806 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question