| 1. | Requests cancellation of a pending background operation
请求取消挂起的后台操作。 |
| 2. | How to : implement a form that uses a background operation
如何：实现使用后台操作的窗体 |
| 3. | If the background operation is already running , calling
如果后台操作已在运行，则再次调用 |
| 4. | To set up for a background operation , add an event handler for the
要为后台操作做好准备，请添加 |
| 5. | Starts execution of a background operation
开始执行后台操作。 |
| 6. | Walkthrough : implementing a form that uses a background operation
演练：实现一个使用后台操作的窗体 |
| 7. | Setting up for a background operation
为后台操作做好准备 |
| 8. | A parameter for use by the background operation to be executed in the
事件处理程序中执行的后台操作使用的参数。 |
| 9. | Submits a request to terminate the pending background operation and sets the
提交终止挂起的后台操作的请求，并将 |
| 10. | Event is raised , which in turn starts execution of your background operation
事件，该事件随后开始执行后台操作。 |
