How to get End Simulation EntityCommandBuffer System in ECS 1.0?

Questions & Answers
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1

I ask ECS questions but I always got an old version answer of ECS.
For example, World.GetOrCreateSystem() is not the right way in ECS 1.0

private EndSimulationEntityCommandBufferSystem endSimulationEcbSystem;
public void OnCreate(ref SystemState state)
{
    endSimulationEcbSystem = World.GetOrCreateSystem();
    // ...
}
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2

This is how you get EndSimulationEntityCommandBufferSystem in com.unity.entities 1.0 now:

public void OnUpdate ( ref SystemState state )
{
    var endSimulationEcbSystem = SystemAPI.GetSingleton<EndSimulationEntityCommandBufferSystem.Singleton>();
    var ecb = endSimulationEcbSystem.CreateCommandBuffer( state.WorldUnmanaged );
}

It’s a singleton component now. No need to store a reference to it in a local field.

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