Adding multithreading to method with parameters?

[VM]

I'm trying to add multithreading to my win application but I'm having
trouble with the code since the method to be threaded has parameters. How
can I add multithreading to a method with parameters? MSDN says ThreadStart
cannot take parameters, so how can I do it?

public System.Threadin g.Thread Thread_LoadAZM;
public void LoadFile(string sFileName)
{
Thread_LoadAZM= System.Threadin g.Thread(new
System.Threadin g.ThreadStart(t his.loadAuditFi le)); //error
Thread_LoadAZM. Start();
}

private void loadAuditFile(s tring sFileName)
{
.....
}

Thanks again for your help.

[Nicholas Paldino [.NET/C# MVP]]

VM,

You can't, technically, but you can get around it. Since the delegate
that you pass to the Thread constructor (through a delegate) is attached to
a class, you can access members of that class when your method is called.
So, what you have to do is set the appropriate members of the class, then
start the thread, and have the thread access them when the entry point for
the thread first starts.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"VM" <vo******@yahoo .com> wrote in message
news:es******** ******@TK2MSFTN GP09.phx.gbl...

I'm trying to add multithreading to my win application but I'm having
trouble with the code since the method to be threaded has parameters. How
can I add multithreading to a method with parameters? MSDN says ThreadStart cannot take parameters, so how can I do it?

public System.Threadin g.Thread Thread_LoadAZM;
public void LoadFile(string sFileName)
{
Thread_LoadAZM= System.Threadin g.Thread(new
System.Threadin g.ThreadStart(t his.loadAuditFi le)); //error
Thread_LoadAZM. Start();
}

private void loadAuditFile(s tring sFileName)
{
....
}

Thanks again for your help.

[VM]

I'm not sure I understand what you're saying...
Do you mean that I should declare the variables globally from within the
class so the method can access those members? I was working on somethins
like this:

private string _sFileName;
public void DisplayAuditFil e(string sFileName)
{
_sFileName = sFileName;
ThreadStart thr_loadAZM = new ThreadStart(loa dAuditFile);
Thread AZMThread = new Thread (thr_loadAZM);
AZMThread.Name = "myThread";
AZMThread.Start ();
}

private void loadAuditFile()
{
// I use _sFileName here
}

Thanks.again.
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote in
message news:Ox******** ******@TK2MSFTN GP10.phx.gbl...

VM,

You can't, technically, but you can get around it. Since the delegate
that you pass to the Thread constructor (through a delegate) is attached to a class, you can access members of that class when your method is called.
So, what you have to do is set the appropriate members of the class, then
start the thread, and have the thread access them when the entry point for
the thread first starts.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"VM" <vo******@yahoo .com> wrote in message
news:es******** ******@TK2MSFTN GP09.phx.gbl...

I'm trying to add multithreading to my win application but I'm having
trouble with the code since the method to be threaded has parameters. How can I add multithreading to a method with parameters? MSDN says

ThreadStart

cannot take parameters, so how can I do it?

public System.Threadin g.Thread Thread_LoadAZM;
public void LoadFile(string sFileName)
{
Thread_LoadAZM= System.Threadin g.Thread(new
System.Threadin g.ThreadStart(t his.loadAuditFi le)); //error
Thread_LoadAZM. Start();
}

private void loadAuditFile(s tring sFileName)
{
....
}

Thanks again for your help.

[Nicholas Paldino [.NET/C# MVP]]

VM,

You pretty much got it. If you have to have multiple threads hitting
the same method and worry about maintaining the state, you can always
refactor out that code into another class which will do nothing but have the
method which you want to execute, as well as the state needed to run that
code.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"VM" <vo******@yahoo .com> wrote in message
news:ur******** *****@TK2MSFTNG P11.phx.gbl...

I'm not sure I understand what you're saying...
Do you mean that I should declare the variables globally from within the
class so the method can access those members? I was working on somethins
like this:

private string _sFileName;
public void DisplayAuditFil e(string sFileName)
{
_sFileName = sFileName;
ThreadStart thr_loadAZM = new ThreadStart(loa dAuditFile);
Thread AZMThread = new Thread (thr_loadAZM);
AZMThread.Name = "myThread";
AZMThread.Start ();
}

private void loadAuditFile()
{
// I use _sFileName here
}

Thanks.again.
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote in message news:Ox******** ******@TK2MSFTN GP10.phx.gbl...

VM,

You can't, technically, but you can get around it. Since the delegate

that you pass to the Thread constructor (through a delegate) is attached

to

a class, you can access members of that class when your method is called. So, what you have to do is set the appropriate members of the class, then start the thread, and have the thread access them when the entry point for the thread first starts.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"VM" <vo******@yahoo .com> wrote in message
news:es******** ******@TK2MSFTN GP09.phx.gbl...

I'm trying to add multithreading to my win application but I'm having
trouble with the code since the method to be threaded has parameters.

How can I add multithreading to a method with parameters? MSDN says

ThreadStart

cannot take parameters, so how can I do it?

public System.Threadin g.Thread Thread_LoadAZM;
public void LoadFile(string sFileName)
{
Thread_LoadAZM= System.Threadin g.Thread(new
System.Threadin g.ThreadStart(t his.loadAuditFi le)); //error
Thread_LoadAZM. Start();
}

private void loadAuditFile(s tring sFileName)
{
....
}

Thanks again for your help.

[Daniel Pratt]

Hi VM,

"VM" <vo******@yahoo .com> wrote in message
news:es******** ******@TK2MSFTN GP09.phx.gbl...

I'm trying to add multithreading to my win application but I'm having
trouble with the code since the method to be threaded has parameters. How
can I add multithreading to a method with parameters? MSDN says ThreadStart cannot take parameters, so how can I do it?

public System.Threadin g.Thread Thread_LoadAZM;
public void LoadFile(string sFileName)
{
Thread_LoadAZM= System.Threadin g.Thread(new
System.Threadin g.ThreadStart(t his.loadAuditFi le)); //error
Thread_LoadAZM. Start();
}

private void loadAuditFile(s tring sFileName)
{
....
}

Another option (which, frankly, I'm surprised doesn't get more "press")
is to use a custom delegate. So within your class you might have a delegate
declared like this:

private delegate void LoadFileHandler (string sFileName);

Then, to call the LoadFile method on another thread, you could use code
like this:

...
LoadFileHandler handler = new LoadFileHandler (this.LoadFile) ;
handler.BeginIn voke(someFileNa me, null, null);
...

The BeginInvoke method is generated automatically by the compiler from
the delegate declaration. BeginInvoke has all the parameters defined by the
delegate plus one for passing a callback delegate and one for passing a
"state" parameter. Besides making the parameter passing much easier, the
above also has the advantage of using the thread pool, which is usually a
better idea than creating your own threads.

Regards,
Daniel

[Jon Skeet [C# MVP]]

VM <vo******@yahoo .com> wrote:

I'm trying to add multithreading to my win application but I'm having
trouble with the code since the method to be threaded has parameters.

See http://www.pobox.com/~skeet/csharp/threadstart.html

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Eddie]

Hi

A method I use for this is to encapsulate the thread (method) in a class. Isntead of passing parameters, you can set the properties on the class, then call the method. I got this technique from an article on MSDN.
http://msdn.microsoft.com/library/de...net09272002.as

Download the code sample and have a good look..

Cheers