Why is calling a Native Array in a ComponentSystem Entities.Foreach generating garbage?

I am trying to sync up some transforms with an Entity. I don't wanna use the built in stuff from Unity, too heavy for my needs. But I am wondering why this is generating garbage. I am just trying to get a struct value. It generates garbage (4k instances for some reason).

I really don't understand. No garbage should be generated here. I am not generating anything, it is a Native Array, so no garbage should come out of that. Is boxing happening somehow?

Or is there a better way. I want to keep a list of Transforms accessible so that the GameObject Transform can push it's position on the entity transform for physics reasons.

Code (CSharp):

1.  
2. Entities.ForEach((Entity e, ref Translation translation, ref Rotation rotation) =>
3. {
4.      if(IndexRef.TryGetValue(e, out int item))
5.      {
6.             // Does nothing
7.      }
8. }

 

Entities.ForEach generates garbage because you are creating a delegate every time you call it unless cached.

https://jacksondunstan.com/articles/3765

Great article on delegates and garbage.

-edit-

if you want to avoid garbage you need to do something like this

Code (CSharp):

1. private EntityQueryBuilder.F_EDD<Translation, Rotation> method;
2.  
3. start{
4.     this.method = YOURMETHOD;
5. }
6.  
7. update {
8.     Entities.ForEach(this.method);
9. }
10.  
11. private void YOURMETHOD(Entity e, ref Translation translation, ref Rotation rotation)
12. {
13. }

I consider it an issue with Entities.ForEach and hope they can somehow fix it with IL2CPP at some point.

 

Ohhhhhh, I am creating a new action. I hate delegates and stay away from them usually. Of course, what a dummy

Thanks for the help. You have saved me so much time. I had no idea how that was working. I tend to keep to jobs stuff unless I am affecting the world transforms in Old Unity.

Edit: Updated everything and no garbage. I can't thank you enough @tertle. You are a lifesaver!