Creating Threads in C#

Question

I am trying to get a thread working in C# to reset the time and run another function alongside it. The code I have is:

Thread loopTime = new Thread(this.someFunction);
loopTime.Start();

for (int i = 0; i < 20; i++)
{
    ChangeTimeFunction(someTime);
    Thread.Sleep(200);
}

I am getting a threading error if I pass in this.SomeFunction(). This cannot be used according to Visual Studio. I could have the for loop as a thread but I do not know how to pass in the variable someTime.

Is there a way to either pass the variable into the loop if it was a function or call the for loop from within the function.

Thanks for any help.

UPDATE:

someFunction is a recorded methods using Visual Studio. This cannot be used outside the main thread. I would need to put the for loop inside the thread I am creating. Does any one know how to do this?

Thanks

Could you include the definiton of someFunction ?

Henk Holterman
– Henk Holterman

2010-08-05 14:14:09 +00:00
Commented Aug 5, 2010 at 14:14 — Henk Holterman
– Henk Holterman, Commented Aug 5, 2010 at 14:14

Powerlord · Accepted Answer · 2010-08-05 14:21:33Z

4

Is there a way to either pass the variable into the loop if it was a function or call the for loop from within the function.

.NET has two delegates for starting threads. The first is ThreadStart, which just calls a method with no arguments.

The second is ParameterizedThreadStart, which calls a method with a single object as a parameter.

C# will implicitly create a ParameterizedThreadStart delegate if you pass a method in the Thread constructor that has an object argument. You then send an object to it using the thread's .Start(Object) method.

For example, to make the for loop a thread, assuming someTime is a DateTime and including a cast to that effect:

Thread loopTime = new Thread(someFunction);
loopTime.Start(someTime);

public void someFunction(object someTime) {
    for (int i = 0; i < 20; i++)
    {
        // Note the cast here... I assumed it's a DateTime
        ChangeTimeFunction((DateTime) someTime);
        Thread.Sleep(200);
    }
}

answered Aug 5, 2010 at 14:21

Powerlord

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1 Comment

chrisg Over a year ago

@ R. Bemrose -- The ParameterizedThreadStart link was perfect. Thanks +1

JMcCarty · Accepted Answer · 2010-08-05 14:05:59Z

0

I think this link: http://msdn.microsoft.com/en-us/library/aa645740%28VS.71%29.aspx can explain what you need to do. It seems the ThreadStart delaget will allow you to pass it a function to execute when the thread is started.

answered Aug 5, 2010 at 14:05

JMcCarty

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Alex Krupnov · Accepted Answer · 2010-08-05 14:07:48Z

0

It does not sound like problem of "this" qualifier.

Does your someFunction accept a parameter? If yes you can either:

Make it parameterless and pass data thru member field

Use can use closure to pass variable from the outer scope.

int i = 2;
Thread t = new Thread(x =>
                          {
                              i++;                                      
                          });

t.Start();

answered Aug 5, 2010 at 14:07

Alex Krupnov

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