# UpdatePrefabInstancesEventArgs

> A change of this type indicates that prefab instances in an open scene have been updated due to a change to the source prefab.

## Definition

* **Type:** Struct
* **Namespace:** [UnityEditor](/engine/6000.3/script-reference/unityeditor.md)
* **Assembly:** UnityEditor

```csharp
public struct UpdatePrefabInstancesEventArgs
```

## Constructors

| Constructor                                                                                                                                                                                                   | Description                |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------- |
| [UpdatePrefabInstancesEventArgs(UnityEngine.SceneManagement.Scene,Unity.Collections.NativeArray\{System.Int32}.ReadOnly)](/engine/6000.3/script-reference/unityeditor/updateprefabinstanceseventargs/ctor.md) | Constructs a new instance. |

## Properties

| Property                                                                                                 | Description                                                                                                                                           |
| -------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------- |
| [instanceIds](/engine/6000.3/script-reference/unityeditor/updateprefabinstanceseventargs/instanceids.md) | The instance ID for each root [GameObject](/engine/6000.3/script-reference/unityengine/gameobject.md) of the prefab instances that have been updated. |
| [scene](/engine/6000.3/script-reference/unityeditor/updateprefabinstanceseventargs/scene.md)             | The scene containing all of the prefab instances that have been updated.                                                                              |