473,322 Members | 1,314 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,322 software developers and data experts.

Question regardingThreading

Hi all,

I am having application in c# with on main form and other 3 classes.

Say suppose i have class1, class2.

I have progressbar in main form which i have to update.

I have one method in main class which is my thread procedure.

In thread procedure i am calling method of class1. In method of class
one i am calling method of class2.

And in method of class2 i am raising one event with parameter as
percengate which i am trapping in class1. and again in class1 i am
raising that event which is getting trapped in main form.

This whole process is in thread.

My question is what i am doing as said above is write or not. Means
whether i am updating UI thread properly or not by raising event.

Please correct me if i am wrong.

Thanks in advance.
Archana.

Feb 17 '06 #1
5 1206
archana wrote:
I am having application in c# with on main form and other 3 classes.

Say suppose i have class1, class2.

I have progressbar in main form which i have to update.

I have one method in main class which is my thread procedure.

In thread procedure i am calling method of class1. In method of class
one i am calling method of class2.

And in method of class2 i am raising one event with parameter as
percengate which i am trapping in class1. and again in class1 i am
raising that event which is getting trapped in main form.

This whole process is in thread.

My question is what i am doing as said above is write or not. Means
whether i am updating UI thread properly or not by raising event.


No. Event handlers (by default, anyway) execute in whatever thread
raises the event. When you update the main form, you should use
Control.Invoke/BeginInvoke to make sure you're accessing the UI in the
appropriate thread.

Jon

Feb 17 '06 #2
Hi,
thanks for your reply.

Here i am posting my code :-
namespace class1
{

public delegate void ProgressEventHandler( object sender,
CustomEventArg e );

public class DataReaderWriter : IDisposable
{
public event ProgressEventHandler OnProgress;
private DataClient dcReader;

public DataReaderWriter()
{
this.dcReader.ChangedPercentage
+= new CustomEventHandler(this.InsertProgress);

}
public void InsertProgress(object
sender, CustomEventArg e)
{
OnProgress(sender,e);
}
public void StartProcess()
{
this.dcreader.StartProcess1();

}

}

}
Public classs DataClient()
{

public delegate void CustomEventHandler( object sender, CustomEventArg
ev );
public event CustomEventHandler ChangedPercentage;

Publiv void StartProcess1();
{
CustomEventArg args = new CustomEventArg();
args.StatusOfProcess = precentage;
args.FileName = this.fileName;
if( ChangedPercentage != null )
{
ChangedPercentage( this, args );
}
}

}

And code in my main form is like :-

On button click:-

this.dbFileReader.OnProgress += new
ProgressEventHandler(this.ProgressStepChange);
workerMatchThread = new Thread(new ThreadStart(StartProcess3));
workerMatchThread.Start();
public void StartProess3()
{
This.dbreader. StartProcess
}

private void ProgressStepChange(object sender,CustomEventArg e)
{
if(e.StatusOfProcess < 100)
{
this.pgr.Value = e.StatusOfProcess;
this.txtFileName.Text = e.FileName;
}
}
Please tell me If i am wrong.

Thanks in advance.

Feb 17 '06 #3
Hi,
I didn't read all of your post, but I believe that a progress should be
update once in a second, or even in a larger period.
With this in mind, I would create a timer in the form to update your
controls - this timer should access some property on your thread that
indicates the progress. This is really light. I think that's the easier
solution...

"archana" <tr**************@yahoo.com> wrote in message
news:11*********************@g14g2000cwa.googlegro ups.com...
Hi all,

I am having application in c# with on main form and other 3 classes.

Say suppose i have class1, class2.

I have progressbar in main form which i have to update.

I have one method in main class which is my thread procedure.

In thread procedure i am calling method of class1. In method of class
one i am calling method of class2.

And in method of class2 i am raising one event with parameter as
percengate which i am trapping in class1. and again in class1 i am
raising that event which is getting trapped in main form.

This whole process is in thread.

My question is what i am doing as said above is write or not. Means
whether i am updating UI thread properly or not by raising event.

Please correct me if i am wrong.

Thanks in advance.
Archana.

Feb 17 '06 #4
Hi,
At some point you need to send the event to the UI thread. as you have a
link of calls when only at the end you update your UI you need to use
InvokeRequired to check if you need to invoke or not.

alternatively you can use control.invoke in the procedure that started the
thread and do all the other calls right in the UI thread, unless that the
methods you call do a long processing you should consider this approach.
--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"archana" <tr**************@yahoo.com> wrote in message
news:11*********************@g14g2000cwa.googlegro ups.com...
Hi all,

I am having application in c# with on main form and other 3 classes.

Say suppose i have class1, class2.

I have progressbar in main form which i have to update.

I have one method in main class which is my thread procedure.

In thread procedure i am calling method of class1. In method of class
one i am calling method of class2.

And in method of class2 i am raising one event with parameter as
percengate which i am trapping in class1. and again in class1 i am
raising that event which is getting trapped in main form.

This whole process is in thread.

My question is what i am doing as said above is write or not. Means
whether i am updating UI thread properly or not by raising event.

Please correct me if i am wrong.

Thanks in advance.
Archana.

Feb 17 '06 #5
archana <tr**************@yahoo.com> wrote:
Please tell me If i am wrong.


Yes - you've got no calls to Control.BeginInvoke/Invoke, so you're
accessing the UI from the wrong thread. See
http://www.pobox.com/~skeet/csharp/t...winforms.shtml
for more information.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
Feb 18 '06 #6

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

3
by: Stevey | last post by:
I have the following XML file... <?xml version="1.0"?> <animals> <animal> <name>Tiger</name> <questions> <question index="0">true</question> <question index="1">true</question> </questions>
7
by: nospam | last post by:
Ok, 3rd or is it the 4th time I have asked this question on Partial Types, so, since it seems to me that Partial Types is still in the design or development stages at Microsoft, I am going to ask...
3
by: Ekqvist Marko | last post by:
Hi, I have one Access database table including questions and answers. Now I need to give answer id automatically to questionID column. But I don't know how it is best (fastest) to do? table...
10
by: glenn | last post by:
I am use to programming in php and the way session and post vars are past from fields on one page through to the post page automatically where I can get to their values easily to write to a...
10
by: Rider | last post by:
Hi, simple(?) question about asp.net configuration.. I've installed ASP.NET 2.0 QuickStart Sample successfully. But, When I'm first start application the follow message shown. ========= Server...
53
by: Jeff | last post by:
In the function below, can size ever be 0 (zero)? char *clc_strdup(const char * CLC_RESTRICT s) { size_t size; char *p; clc_assert_not_null(clc_strdup, s); size = strlen(s) + 1;
56
by: spibou | last post by:
In the statement "a *= expression" is expression assumed to be parenthesized ? For example if I write "a *= b+c" is this the same as "a = a * (b+c)" or "a = a * b+c" ?
2
by: Allan Ebdrup | last post by:
Hi, I'm trying to render a Matrix question in my ASP.Net 2.0 page, A matrix question is a question where you have several options that can all be rated according to several possible ratings (from...
3
by: Zhang Weiwu | last post by:
Hello! I wrote this: ..required-question p:after { content: "*"; } Corresponding HTML: <div class="required-question"><p>Question Text</p><input /></div> <div...
0
by: DolphinDB | last post by:
Tired of spending countless mintues downsampling your data? Look no further! In this article, you’ll learn how to efficiently downsample 6.48 billion high-frequency records to 61 million...
0
by: ryjfgjl | last post by:
ExcelToDatabase: batch import excel into database automatically...
0
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
1
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
0
by: Vimpel783 | last post by:
Hello! Guys, I found this code on the Internet, but I need to modify it a little. It works well, the problem is this: Data is sent from only one cell, in this case B5, but it is necessary that data...
0
by: jfyes | last post by:
As a hardware engineer, after seeing that CEIWEI recently released a new tool for Modbus RTU Over TCP/UDP filtering and monitoring, I actively went to its official website to take a look. It turned...
1
by: CloudSolutions | last post by:
Introduction: For many beginners and individual users, requiring a credit card and email registration may pose a barrier when starting to use cloud servers. However, some cloud server providers now...
1
by: Defcon1945 | last post by:
I'm trying to learn Python using Pycharm but import shutil doesn't work
1
by: Shællîpôpï 09 | last post by:
If u are using a keypad phone, how do u turn on JavaScript, to access features like WhatsApp, Facebook, Instagram....

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.