| flags | 要设置的标志。 |
设置标志，描述有关如何执行命令缓冲区的意图。
通过将执行标志设置为 none 以外的任何其他值，可以在发出与执行的预期方法不兼容的命令时抛出异常。 例如，旨在与异步计算一起使用的命令缓冲区不能包含纯粹用于渲染的命令。 此方法只能针对空命令缓冲区进行调用，因此请在构建之后或调用 CommandBuffer.Clear 之后立即调用它。
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