Pass Arguments To Method When Multithreading

Question

So, I'm trying to pass an argument to a method that I want to participate in multithreading. So, I wrote code that looks like this:

    new Thread (Go(ineedthis)).Start();
    Go();

  static void Go(string ineedthis)
  {
    lock (locker)
    {
      if (!done) { Console.WriteLine ("Done"); done = true; }
    }
  }

However, I can't pass the argument ineedthis, because it will give an error when you insert it like I did in the first line. Conversely, if you don't give an argument when making the thread for the method, it will also give an error.

So, how does one pass an argument to a method when creating a thread?

Thanks! Note: I just started c# yesterday, so I'm totally new to this. Please explain well so I get more out of it!

EDIT - Errors:

Error   1   The best overloaded method match for 'System.Threading.Thread.Thread(System.Threading.ParameterizedThreadStart)' has some invalid arguments     23  21  test


Error   2   Argument 1: cannot convert from 'method group' to 'System.Threading.ParameterizedThreadStart'   23  32  test

possible duplicate of [How to pass parameters to ThreadStart method in Thread?](http://stackoverflow.com/questions/3360555/how-to-pass-parameters-to-threadstart-method-in-thread) — Steven Doggart, Jul 10 '12 at 19:10

score 3 · Accepted Answer · answered Jul 10 '12 at 19:08

3

I think you are looking for something more like this:

  var t = new Thread (Go); 
t.Start(ineedthis);

You first create a thread that details what the method will be when run on the background thread. You then start the thread, passing in any parameters as needed. See MSDN for more info.

answered Jul 10 '12 at 19:08

Josh

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Didn't work, errors same as posted above. Second line didn't throw anything, first line got mad – Jakexx360 Jul 10 '12 at 19:10
1

Change your Go method to be Go(object ineedthis) – Josh Jul 10 '12 at 19:14

score 1 · Answer 2 · answered Jul 10 '12 at 19:11

You need a ParameterizedThreadStart delegate:

new Thread (Go).Start(ineedthis);

and the method signature needs to be object ineedthis, not string ineedthis:

static void Go(object ineedthis)
{
  string data = (string)ineedthis;
  lock (locker)
  {
    if (!done) { Console.WriteLine ("Done"); done = true; }
  }
}

score 1 · Answer 3 · answered Jul 10 '12 at 19:14

1

You can use Task Parallel Library for this.

Task.Factory.StartNew(() => Go("test"));

answered Jul 10 '12 at 19:14

L.B

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score 0 · Answer 4 · answered Jul 10 '12 at 19:30

0

This should also work:

new Thread (() => Go(ineedthis)).Start();

That wraps the method call inside a zero-argument lambda that is assignable to a ThreadStart.

answered Jul 10 '12 at 19:30

Rytmis

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score 0 · Answer 5 · answered Mar 19 '14 at 21:10

0

    Thread workerThread = new Thread (() => go("example"));
    workerThread.Start();

answered Mar 19 '14 at 21:10

john Peralta

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Pass Arguments To Method When Multithreading

5 Answers5