c# multithreading method name expected

Question

I'm trying to create a loop which creates a thread for each program in a list, but i'm getting a "method name expected" error upon passing perimeters on the code below;

for (i = 0; i <= programs.Count; i++)
{
    checkProcess check = new checkProcess();
    // check.isRunning();

    string filename = programs[i].Filename;
    string filepath = programs[i].Filepath;

    mWorkerThread = new Thread(new ThreadStart(check.isRunning(filename, filepath)));

    mWorkerThread.Start();
}

I read a little on delegates but couldn't seem to get them to work in the context of my problem. Any help would be greatly appreciated as to what direction i should be heading.

To tell you the truth i'm not sure how..lemme take a quick look. Edit: got it! — Kestami, Apr 16 '12 at 15:09

score 12 · Accepted Answer · answered Apr 16 '12 at 14:59

12

The thread target ought to be something executable and not the result of your method.

mWorkerThread = new Thread(new ThreadStart(check.isRunning(filename, filepath)));

In your case above, you try to create a new instance of ThreadStart with the return value of check.IsRunning(...). What you want is something like

mWorkerThread = new Thread( () => check.isRunning(filename, filepath) );

answered Apr 16 '12 at 14:59

Matten

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Works brilliantly : ) thank you. What does the => symbolise exactly? – Kestami Apr 16 '12 at 15:03
It's an anonymous function definition. More info on http://msdn.microsoft.com/en-us/library/bb397687.aspx – Matten Apr 16 '12 at 15:04

score 2 · Answer 2 · edited May 23 '17 at 11:43

In your statement mWorkerThread = new Thread(new ThreadStart(check.isRunning(filename, filepath))); check.isRunning is the method name that called on the start of the thread.

Thread t = new Thread(new ThreadStart(ThreadMethod));
t.Start("My Parameter");

// method that will be called
    private void ThreadMethod(object parameter)
    {
        // parameter equals to "My Parameter"
    }

Another expect is the anonymous delegate method that make your method inline.. using lambda expression:

   Thread t = new Thread(new ThreadStart(()=>ThreadMethod(parmaValue) ));
    t.Start("My Parameter");

Ref: ThreadStart with parameters

c# multithreading method name expected

2 Answers2