异步文件请求已完成，但一个或多个读取操作已被截断。
当描述读取操作的 ReadCommand 指定 Size 和 Offset 超出目标文件结尾时，就会发生截断读取。在读取操作完成后，使用 ReadHandle.GetBytesRead 获取请求读取的总字节数，或使用 ReadHandle.GetBytesReadAtIndex 获取单个 ReadCommand 读取的字节数。截断读取通常不会指示出现问题；文件中的所有数据均已读取，而且没有任何额外的字节被复制到读取缓冲区中。
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