| id | 项目或包标识符。 |
| tag | 数据流索引。 |
获取帧中每个 ID 和标签 对的元数据块总数。
对于给定 ID、''标签' '对，相同帧中的多个 Profiler.EmitFrameMetaData 调用会形成与帧关联的多个元数据数组。
这可以用于将数据分为小部分写入流中，从而减少保存生成的数据所需的内存量。
使用 GetFrameMetaDataCount 方法获取此帧中提供的元数据数组总数。
使用 ID 标识来自项目或包的元数据。
使用 tag 区分不同数据流。
另请参阅：GetFrameMetaData、Profiler.EmitFrameMetaData。
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