如何将此C#2委托示例转换为C#3 lambda语法?

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

C#3 lambda语法示例:

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

但是如何将其转换为lambda语法呢?特别是,我如何获得 两个参数 (对象s,DoWorkEventArgs args)是否使用“=>”传递?

_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);
    }
};