How to Resolve Thread Problem in My application

Question

4.00/5 (1 vote)

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Dear Friends,

Here i facing the Typical Problem in my Application iam using the Progress Bar Image that functionality iam using in another form when in Start button iam calling the functionality through Start Button

in start Button i written the code:

C#

thrd = new System.Threading.Thread(new System.Threading.ThreadStart(opendashboard1));
              thrd.IsBackground = true;
              thrd.Start();

Before executing the Functionality iam slepping this thread.

C#

if (signalsim == 1)
                                     {
                                         try
                                         {
                                             comm.Close();
                                             scrTemp.Start();

                                             Thread.Sleep(50000);
                                             scrTemp.Refresh();
                                             string str = scrTemp.Status.ToString();
                                             if (str == "StartPending")
                                             {
                                                 XtraMessageBox.Show("Gsm Modem is Not Connected");
                                                 
                                                     thrd.Abort();
                                               
                                                 Kill_UnwantedService();
                                                 this.Enabled = true;
                                                 picboxSMSService.Image = DEMIS_SERVER.Properties.Resources.new_close_30;
                                                 btnSMSService.Text = "START";
                                                 scrTemp.Refresh();
                                             }
                                             else if (str == "Running")
                                             {
                                                 XtraMessageBox.Show("SMS Service Connected Sucessfully..");
                                               
                                                
                                                     thrd.Abort();
                                                    
                                                
                                                 this.Enabled = true;
                                                 btnSMSService.Text = "STOP";
                                                 picboxSMSService.Image = DEMIS_SERVER.Properties.Resources.new_ok_30;
                                             }
                                             else if (str == "Stopped")
                                             {
                                                 XtraMessageBox.Show("Gsm Modem Device is Not Connected");
                                                
                                                     thrd.Abort();
                                                

                                                 this.Enabled = true;
                                                 btnSMSService.Text = "START";
                                                 picboxSMSService.Image = DEMIS_SERVER.Properties.Resources.new_close_30;

                                             }
                                         }
                                         catch (Exception ex)
                                         {

                                         }

                                     }

Here in thread.abort iam getting the Exception like some Unhandled exception is coming.I dont know why its coming.If any information please share with me.

Regards,

AnilKumar.D

Posted 11-Sep-12 1:44am

Anil Honey 206

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[no name] 11-Sep-12 7:49am

Knowing what the exception is, is really really helpful

3 solutions

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Rock (Multithreaded) · Answer 1 · 2012-09-11T01:57:00

Solution 1

You need to handle this error.

C#

try
{
thrd.Abort();
}
catch(Exception){}

///By the way, abort() is not a good practice to stop a thread// 
//Read msdn System.Threading documentation//

Posted 11-Sep-12 1:57am

Rock (Multithreaded)

Updated 11-Sep-12 1:59am

v2

Comments

Anil Honey 206 11-Sep-12 8:01am

Can u give the exact method how to abort the thread like this situation.

Rock (Multithreaded) 11-Sep-12 8:04am

Can you post your thread method [opendashboard1()].

Anil Honey 206 11-Sep-12 8:06am

private void opendashboard1()
{
xf4 = new ProgressForm();
xf4.ShowDialog();
}
after this iam calling that form like this

thrd = new System.Threading.Thread(new System.Threading.ThreadStart(opendashboard1));
thrd.IsBackground = true;
thrd.Start();

Rock (Multithreaded) 11-Sep-12 8:08am

Just a minute...

Rock (Multithreaded) 11-Sep-12 8:09am

Are you using opendashboard1() method in a winForm?

Anil Honey 206 11-Sep-12 8:10am

s its a windows application

Rock (Multithreaded) 11-Sep-12 8:14am

Does Class of opendashboard1() method extends System.Windows.Form class? ( :Form )

Anil Honey 206 11-Sep-12 8:17am

iam not get u but that opendashbord1() method executes from windows.form class.

_Amy · Answer 2 · 2012-09-11T02:10:00

Solution 2

Obviously, you'll get that error. because before aborting the thread you are not checking the current status of the thread whether the thread is alive or not.
Try this to abort the thread:

C#

//If the thread is alive
if(thrd.IsAlive)
{
    //Then abort the thread
    thrd.Abort();
}

View Threading Tutorial[^] for the reference.

--Amit

Posted 11-Sep-12 2:10am

_Amy

Comments

Anil Honey 206 11-Sep-12 8:12am

Thanks i will check it in my application

Rock (Multithreaded) · Answer 3 · 2012-09-11T02:25:00

Solution 3

//Remember, if you'r using a UI component(eg: button, window,textbox...) then, don't use directly UI component inside threading....

private void opendashboard1()
{
this.Invoke(

C#

(MethodInvoker)delegate()
           {
            xf4 = new ProgressForm();
            xf4.ShowDialog();
           });
        }

But tell me, Why you'r opening this Dialog inside a thread?

Posted 11-Sep-12 2:25am

Rock (Multithreaded)

Updated 11-Sep-12 2:28am

v2

Comments

Rock (Multithreaded) 11-Sep-12 8:32am

If you only want to open a dialog, then don't use threading.

Anil Honey 206 12-Sep-12 0:04am

actually i create dashboard for my application in that dashboard start button is there to run the windows service.The windows service will take time to activate mean while i blocked the dashboard because user not intract anything on the dashboard until the windows service start so i write the code this.Enabled = false; so after this i called the progress bar form and sleep the thread after the windows service starts i abort the thread.But this functionality works sometime.And some times it showing error.

Rock (Multithreaded) 12-Sep-12 1:43am

Send me Complete dashboard window code...I will send you complete Code.

Anil Honey 206 13-Sep-12 2:52am

thrd = new System.Threading.Thread(new System.Threading.ThreadStart(opendashboard1)); thrd.IsBackground = true; thrd.Start();
this is the code iam calling the progress bar window.

Rock (Multithreaded) 13-Sep-12 3:01am

You need to Dispose() your ProgressForm before Abort thread.
xf4.Dispose();

Rock (Multithreaded) 13-Sep-12 3:02am

Send me the code of ProgressForm();

Anil Honey 206 13-Sep-12 5:34am

I have not return any code in ProgressForm() just i deigned the form and iam calling the form through thread.