Message in Chinese (Simplified) (中文(简体))
入口点返回一个标记为“CompletedSynchronously = true”的 IAsyncResult 实例，但从未同步调用过 AsyncCallback。如果操作是同步完成的，并且 AsyncCallback 不是 null，则必须在入口点返回至调用方之前同步调用该回调。
Unlocalized message
The entry point returned an IAsyncResult instance that was marked 'CompletedSynchronously = true', but AsyncCallback was never invoked synchronously. If an operation completes synchronously and AsyncCallback is non-null, the callback must be invoked synchronously before the entry point returns to its caller.
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