# ResolveSystem<T>(SystemHandle)

> Obsolete. Use WorldUnmanaged.GetUnsafeSystemRef instead.

## Definition

* **Type:** Method
* **Namespace:** [Unity.Entities](/engine/7000.0/script-reference/unity/entities.md)
* **Assembly:** UnityEngine.EntitiesModule

> **Warning:**
>
> **Removed.** Use GetUnsafeSystemRef
>
> **Upgrade to** [WorldUnmanaged.GetUnsafeSystemRef](/engine/7000.0/script-reference/unity/entities/worldunmanaged/getunsafesystemref.md)

```csharp
public ref T ResolveSystem<T>(SystemHandle systemHandle) where T : unmanaged, ISystem
```

### Parameters

**** (\[SystemHandle]\(/engine/7000.0/script-reference/unity/entities/systemhandle)): The system handle

### Returns

| Type | Description |
| ---- | ----------- |
| T    |             |