c# send parameters to anonymous thread function

Question

I am using the next code to open a thread:

var thread = new Thread(() =>{  
   /*thread code*/  
});  
thread.Name = "Thread1";  
thread.Start();`

I wish to pass an object to the thread function so I tried this approach:

var thread = new Thread(() =>(myObject){  
}); 

But this is not working, so you have any idea how to do it?

Answer 1

Define the object that you want to reference from your anonymous function ahead of your function, like this:

var myObject = ... // <<== Define object here
var thread = new Thread(() => {
    Console.WriteLine("My object: {0}", myObject);
    /*thread code*/  
});  
thread.Name = "Thread1";  
thread.Start();

C# compiler will automatically capture the myObject object in the process of creating the anonymous function, making it available to use inside the function body.

Answer 2

The version you are using is a ThreadStart which takes no argument, we have to use a ParameterizedThreadStart which takes 1 argument (of type object ), so the corresponding lambda expression for that delegate would be something like this:

var thread = new Thread((arg) =>{  
    //use the arg here ...
});
//then run the thread like this
thread.Start(myObject);

Note that the Start method has an overload taking one argument allowing you to pass in the actual argument for the thread when running it.