BackgroundWorker with anonymous methods?

Question

I\'m gonna create a BackgroundWorker with an anonymous method.
I\'ve written the following code :

BackgroundWorker bgw = new B         


        

Answer 1

Lets make it simple

Lambda expressions are really handy to make the code shorter and more readable. However entry level programmers might find it a bit difficult to deal with. There are three separate concepts one should go through: anonymous methods, delegates and lambda expressions. A detailed walk-through of each of them is beyond the scope of this answer. I hope that the code example given below will serve the purpose of giving a quick view of the different approaches available.

class TestBed
{
    BackgroundWorker bgw = new BackgroundWorker();
    void sample()
    {            
        //approach #1
        bgw.DoWork += new DoWorkEventHandler(bgw_DoWork);
        //DoWorkEventHandler is nothing but a readily available delegate written by smart Microsoft guys

        //approach #2, to make it a little shorter
        bgw.DoWork += (s,e) => 
        {
            //...
        };
        //this is called lambda expression (see the => symbol)

        //approach #3, if lambda scares you
        bgw.DoWork += delegate 
        { 
            //... (but you can't have parameters in this approach
        };

        //approach #4, have a helper method to prepare the background worker
        prepareBgw((s,e)=>
        {
            //...
        }
        );

        //approach #5, helper along with a simple delegate, but no params possible
        prepareBgw(delegate 
        {
            //...
        }
        );

        //approach #6, helper along with passing the methodname as a delegate
        prepareBgw(bgw_DoWork);

        //approach #7, helper method applied on approach #1
        prepareBgw(new DoWorkEventHandler(bgw_DoWork));

    }

    void bgw_DoWork(object sender, DoWorkEventArgs e)
    {
        //...
    }
    void prepareBgw(DoWorkEventHandler doWork)
    {
        bgw.DoWork+= doWork;
    }
}

Note that we used "delegate" and not "Delegate" in this example (there is a difference between the two)