Solved

Threading in .net

Posted on 2009-04-14
7
235 Views
Last Modified: 2013-11-08
we are making an application which requires fetch from the database using a webservice. Until the fetch completes the application hangs. We incoroporated threads into the application both plain threads and background threads but none of them are able to bring the application out of the hang until the fetch completes. What could be wrong with our approach? we want a separate thread doing a fetch and doesnot effect the rest of the application!
0
Comment
Question by:sultansaadat
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 2
7 Comments
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 24141053
Could you possibly post some code dealing with where you are creating the thread and where you are making the threaded call to the webservice?
0
 

Author Comment

by:sultansaadat
ID: 24141179
here goes the code. This one has a simple call to an online database.
 ClassDAL cdl = new ClassDAL();
 DataSet ds = new DataSet();
 void testThread()
        {
            
            
             if (InvokeRequired)
            {
                   
                MethodInvoker method = new MethodInvoker(testThread);
                Invoke(method);
                return;
            }
 
           
            ClassDAL cdl = new ClassDAL();
            //DataSet ds = new DataSet();
            ds = cdl.getAllProducts();
 
        
           
        }
 
 private void button1_Click(object sender, EventArgs e)
        {
         
            this.backgroundWorker1.RunWorkerAsync();
            
            
            
        }
 private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
 
            testThread();
            //System.Threading.Thread.Sleep(500);
           
        }
 
        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            dataGridView1.DataSource = ds;
            dataGridView1.DataMember = ds.Tables[0].TableName;
        }

Open in new window

0
 

Author Comment

by:sultansaadat
ID: 24141197
our thread is not running asynchronously!
0
Increase Agility with Enabled Toolchains

Connect your existing build, deployment, management, monitoring, and collaboration platforms. From Puppet to Chef, HipChat to Slack, ServiceNow to JIRA, Splunk to New Relic and beyond, hand off data between systems to engage the right people.

Connect with xMatters.

 
LVL 6

Expert Comment

by:obrienslalom
ID: 24141968
Take a look at the documentation for the ISychronizeInvoke interface:
http://msdn.microsoft.com/en-us/library/system.componentmodel.isynchronizeinvoke_methods.aspx.
What happens with Invoke is that is basically just a call to BeginInvoke followed by a call to EndInvoke.  Invoke will be a synchronous call.
0
 

Author Comment

by:sultansaadat
ID: 24141991
Thanks. I will try the code now! :)
0
 

Author Comment

by:sultansaadat
ID: 24142027
basically we wont have to create other threads?
0
 
LVL 6

Accepted Solution

by:
obrienslalom earned 500 total points
ID: 24144223
I am not going to say that you don't need another thread.  That is what the BackGroundWorker will do for you.  What you are running into in your case is a bit odd actually.  A little background might be needed.

Imagine you have a single GUI thread, which creates a bunch of controls. Now you spawn off another thread to perform some work. This new thread shouldn't be able to update the controls created and owned by the GUI thread.

Invoke/BeginInvoke transfers the tasks onto the GUI threads. That is why you are seeing an unresponsive interface.  You are spawning a background worker, which just transfers the work right back to the original thread.

So, basically, you don't need to use Invoke unless you are updating the controls on the GUI.  So do as much work as you can first, then use Invoke when you have to (which will be any cross-thread updates).
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Today I had a very interesting conundrum that had to get solved quickly. Needless to say, it wasn't resolved quickly because when we needed it we were very rushed, but as soon as the conference call was over and I took a step back I saw the correct …
The article shows the basic steps of integrating an HTML theme template into an ASP.NET MVC project
In this video, viewers are given an introduction to using the Windows 10 Snipping Tool, how to quickly locate it when it's needed and also how make it always available with a single click of a mouse button, by pinning it to the Desktop Task Bar. Int…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…

691 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