Threads

[C# Learner]

After a thread has executed and finished, when I try to call its
Start() method again, it throws an exception.

Is it necessary create a new Thread instance every time? Can't I just
re-use the same one?

<relevant parts of the code>

private Thread thread;

public WinForm()
{
thread = new Thread(new ThreadStart(ThreadedCode));
}

private void button1_Click(object sender, System.EventArgs e)
{
thread.Start();
}

private void ThreadedCode()
{
for (int i = 0; i < 10; ++i) {
Text += i;
}
}

</relevant parts of the code>

TIA

 

[Jon Skeet [C# MVP]]

After a thread has executed and finished, when I try to call its
Start() method again, it throws an exception.

Is it necessary create a new Thread instance every time? Can't I just
re-use the same one?

Yes, you need to create a new Thread each time. However, your code is
already not thread-safe - you should only alter the GUI within the
GUI's thread, using Control.Invoke.

 

[Guest]

What exception?

 

[Jon Skeet [C# MVP]]

What exception?

Given the documentation, I'd expect it to be a ThreadStateException.