可以使用此句柄来查询异步读取操作的状态。注意：为避免内存泄漏，必须调用 Dispose。
| JobHandle | 在读取操作完成时完成的 JobHandle。 |
| ReadCount | The number of read commands performed for this read operation. Will return zero until the reads have begun. |
| Status | 读取操作的当前状态。 |
| Cancel | Cancels the AsyncReadManager.Read operation on this handle. |
| Dispose | 处置 ReadHandle。将其用于释放内部资源以便重用。 |
| GetBytesRead | Returns the total number of bytes read by all the ReadCommand operations the asynchronous file read request. |
| GetBytesReadArray | Returns an array containing the number of bytes read by the ReadCommand operations during the asynchronous file read request, where each index corresponds to the ReadCommand index. |
| IsValid | 检查 ReadHandle 是否有效。 |