# GetEntityIds(Hierarchy, ReadOnlySpan<HierarchyNode>, Span<EntityId>)

> Get the entity ids corresponding to the given hierarchy nodes.

## Definition

* **Type:** Method
* **Namespace:** [Unity.Hierarchy](/engine/6000.5/script-reference/unity/hierarchy.md)
* **Assembly:** UnityEngine.HierarchyModule

```csharp
public static void GetEntityIds(this Hierarchy hierarchy, ReadOnlySpan<HierarchyNode> nodes, Span<EntityId> outEntityIds)
```

### Parameters

**** (\[Hierarchy]\(/engine/6000.5/script-reference/unity/hierarchy/hierarchy)): The hierarchy.**** (\[ReadOnlySpan\<HierarchyNode>]\(https\://learn.microsoft.com/dotnet/api/system.readonlyspan-1)): The hierarchy nodes.**** (\[Span\<EntityId>]\(https\://learn.microsoft.com/dotnet/api/system.span-1)): The EntityIds.