如何将该C＃2委托示例转换为C＃3 lambda语法？

Question

---

I've got this example where I convert a C# 2 delegate example:

 Predicate<string> predicate2 = delegate(string n) { return n.StartsWith("J"); }; IList<string> namesWithJ2 = Tools.Filter(names, predicate2); Tools.Dump(namesWithJ2); 

to C# 3 lambda syntax example:

 var filteredNames = Tools.Filter(names, n => n.StartsWith("J")); Tools.Dump(filteredNames); 

---

But how to I convert this to lambda syntax? Particularly, how do I get the two parameters (object s, DoWorkEventArgs args) to be passed using the "=>"?

 _worker.DoWork += delegate(object s, DoWorkEventArgs args) { BackgroundWorker worker = s as BackgroundWorker; for (int i = 0; i < 10; i++) { if (worker.CancellationPending) { args.Cancel = true; return; } Thread.Sleep(1000); worker.ReportProgress(i + 1); } }; 

Answer 1

_worker.DoWork += (s, args) => {
    ....
};

Or if the compiler can't figure out the exact types of s and args:

_worker.DoWork += (object s, DoWorkEventArgs args) => {
    ....
};

Answer 2

The outline of the form is

_worker.DoWork += (s, args) => {body of method};

Other punctuation as the compiler advises