How to pass parameters to ThreadStart method in Thread?

c# .net multithreading
Swapnil Gupta picture Swapnil Gupta · Jul 29, 2010 · Viewed 372.6k times · Source

How to pass parameters to Thread.ThreadStart() method in C#?

Suppose I have method called 'download'

public void download(string filename)
{
    // download code
}

Now I have created one thread in the main method:

Thread thread = new Thread(new ThreadStart(download(filename));

error method type expected.

How can I pass parameters to ThreadStart with target method with parameters?

Answer

Marc Gravell picture Marc Gravell · Jul 29, 2010

The simplest is just

string filename = ...
Thread thread = new Thread(() => download(filename));
thread.Start();

The advantage(s) of this (over ParameterizedThreadStart) is that you can pass multiple parameters, and you get compile-time checking without needing to cast from object all the time.

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