BackgroundWorker:线程执行完毕之后我们可以继续一些操作
示例：
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Main(string[] args)方法中：当前执行的线程编号：{0}", Thread.CurrentThread.ManagedThreadId);
//BackgroundWorker
//创建一个后台执行者对象
BackgroundWorker backWorker = new BackgroundWorker();
//设置该对象要在后台执行的方法
backWorker.DoWork += new DoWorkEventHandler(backWorker_DoWork);
//设置另外一个事件：当程序执行完毕后触发的事件
backWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backWorker_RunWorkerCompleted);
//开始执行
backWorker.RunWorkerAsync(new int[] { 1, 100 });
Console.WriteLine("主线程继续.......");
Console.ReadKey();
}
//当后台方法执行完毕后触发的事件
static void backWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
Console.WriteLine("backWorker_RunWorkerCompleted方法中：当前执行的线程编号：{0}", Thread.CurrentThread.ManagedThreadId);
Console.WriteLine("最后输出结果是：{0}", e.Result);
}
//要在后台执行的方法
static void backWorker_DoWork(object sender, DoWorkEventArgs e)
{
Console.WriteLine("backWorker_DoWork方法中：当前执行的线程编号：{0}", Thread.CurrentThread.ManagedThreadId);
if (e.Argument != null)
{
int[] arr = e.Argument as int[];
//把方法调用完毕后的值赋值给e.Result
e.Result = Sum(arr[0], arr[1]);
}
}
static int Sum(int from, int to)
{
int sum = 0;
for (int i = from; i <= to; i++)
{
sum += i;
}
return sum;
}
}