How can I add a DynamicBuffer to a SystemHandle?

Unity Engine
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1

How can I add a DynamicBuffer to a SystemHandle?
The EntityManager has

public DynamicBuffer<T> AddBuffer<T>(Entity entity)

and

public DynamicBuffer<T> GetBuffer<T>(SystemHandle system, bool isReadOnly = false)

I haven’t found a way to add a DynamicBuffer to a SystemHandle.

2

https://docs.unity3d.com/Packages/com.unity.entities@1.3/api/Unity.Entities.EntityManager.AddComponent.html#Unity_Entities_EntityManager_AddComponent_Unity_Entities_SystemHandle_Unity_Entities_ComponentType_

3

Are you suggesting to use

EntityManager.AddComponent<DynamicBuffer<T>>(state.SystemHandle)

like this?

4

em.AddComponent(systemHandle, ComponentType.ReadWrite<BufferElement>());

5

Have a error: ArgumentException: Type BufferElement is an IBufferElementData type, however it has no fields and is thus invalid; this will waste chunk space for no benefit. If you want an empty component, consider using IComponentData instead.

6

General user error. Makes no sense to have a buffer element type with no fields. Add something to it.

7

Thanks!