asynchronous operations

• Ends a pending asynchronous operation started with
  启动的挂起的异步操作。
• Overridden . ends a pending asynchronous operation started with
  启动的挂起的异步操作。
• Represents the status of an asynchronous operation
  表示异步操作的状态。
• Object that indicates the status of the asynchronous operation
  一个指示异步操作状态的
• The synchronization context for the asynchronous operation
  用于异步操作的同步上下文。
• Tracks the lifetime of an asynchronous operation
  跟踪异步操作的生存期。
• Objects store information about an asynchronous operation
  对象存储有关异步操作的信息。
• Indicates the state of the asynchronous operation
  指示异步操作的状态。
• Ends the lifetime of an asynchronous operation
  结束异步操作的生存期。
• Polling for the status of an asynchronous operation
  轮询异步操作的状态