【Windows8开发】异步编程进阶篇之 单线程套间(STA)及如何控制task执行上下文
（请大家注意了，本文涉及的概念相当重要，开发中相当管用）开始就先来看一段代码：
auto workItemDelegate = [this](IAsyncAction^ workItem) { this->Btn->Content = "thread";};auto workItemHandler = ref new Windows::System::Threading::WorkItemHandler(workItemDelegate);Windows::System::Threading::ThreadPool::RunAsync(workItemHandler, Windows::System::Threading::WorkItemPriority::Low);