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# D3D12CommandList::BeginQuery
```cpp
void BeginQuery(ID3D12QueryHeap* queryHeap, QueryType type, uint32_t index);
```
开始查询。
**参数:**
- `queryHeap` - 查询堆
- `type` - 查询类型
- `index` - 查询索引
**复杂度:** O(1)
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**示例:**
```cpp
ID3D12QueryHeap* queryHeap = /* 获取查询堆 */;
cmdList.BeginQuery(queryHeap, QueryType::Timestamp, 0);
```
## 相关文档
- [D3D12CommandList 总览](command-list.md) - 返回类总览
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- [EndQuery](end-query.md) - 结束查询
- [ResolveQueryData](resolve-query-data.md) - 解析查询数据