thread method parameters

Question

Hello I create 3 threads but I need that they use one array list in common to insert data , my question is that I create a thread like this Thread t = new Thread(doThread); but if you see do thread it’s a method without parameters but i want to pass the array list mentioned before. It´s possible ?

Answer 1

You can use a ParameterizedThreadStart Delegate

For example,

ArrayList theList = new ArrayList(); 
Thread t = new Thread(doThread);
t.Start(theList);

This will work as long as your delegate, doThread, has a matching signature of:

public delegate void ParameterizedThreadStart(
    Object obj
)

More information about the ParameterizedStart delegate can be found here.

Edit - just read that you will be needing more than an ArrayList. Keep in mind that while it only accepts one parameter, you can create your own Object as a wrapper for everything that you need to send to the method.

public class SendDataExample
{
   public ArrayList myList { get; set; }
   public string myString { get; set; }
}

You could then use the Object in your delegate like this:

public void doThread(object data)
{
    var sendDataExample = (SendDataExample)data;
    ArrayList myList = sendDataExample.myList;
    string myString = sendDataExample.myString;
    ...
}