# ContainsKey(in HierarchyNode)

> Determine whether or not the HierarchyNodeMapUnmanaged<T> contains the specified HierarchyNode.

## Definition

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

## ContainsKey(HierarchyNode)

```csharp
public bool ContainsKey(in HierarchyNode node)
```

### Parameters

**** (\[HierarchyNode]\(/engine/6000.5/script-reference/unity/hierarchy/hierarchynode)): The hierarchy node.

### Returns

| Type                                                          | Description                                                                                                                                                                                                                                               |
| ------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [bool](https://learn.microsoft.com/dotnet/api/system.boolean) | `true` if the [HierarchyNodeMapUnmanaged\<T>](/engine/6000.5/script-reference/unity/hierarchy/hierarchynodemapunmanaged1.md) contains the specified [HierarchyNode](/engine/6000.5/script-reference/unity/hierarchy/hierarchynode.md), `false` otherwise. |