Question DynamicBuffer in foreach loop

Greetings!

I'm trying to modify dynamic buffer in the foreach loop, but getting this error:
"Foreach iteration variable 'fmodFloatParameters' is immutable. Cannot modify struct member when accessed struct is not classified as a variable".

But in ECS Manual it is said: "DynamicBuffer<T> type parameters in SystemAPI.Query<T> are read-write access by default.".
Why I cannot modify it in my case? Help, please !

Code (CSharp):

1.  
2. using System;
3. using Unity.Entities;
4. using Unity.Mathematics;
5. using Weapons.Audio.FMOD.Authoring;
6. using Weapons.Audio.FMOD.Components;
7.  
8. namespace Weapons.Audio.FMOD.Systems
9. {
10.     [UpdateInGroup(typeof(PresentationSystemGroup))]
11.     public class FmodUpdateFloatParametersSystem: ISystem
12.     {
13.         public void OnUpdate(ref SystemState state)
14.         {
15.             foreach (var (fmodFloatParameters, floatParameters, fmodSound)
16.                    in SystemAPI.Query<DynamicBuffer<FMODFloatParameter>, DynamicBuffer<FloatParameter>, RefRO<FMODSound>>()
17.                        .WithChangeFilter<FloatParameter>())
18.              {
19.                 int length = math.min(fmodFloatParameters.Length, floatParameters.Length);
20.                
21.                 for (int i = 0; i < length; i++)
22.                 {
23.                     var floatParameter = floatParameters[i];
24.                     FMODFloatParameter fmodFloatParameter = fmodFloatParameters[i];
25.                    
26.                     if (Math.Abs(fmodFloatParameter.CurrentValue - floatParameter.Value) < 0.0001f) continue;
27.                     fmodSound.ValueRO.Event.setParameterByID(fmodFloatParameter.ParameterID, floatParameter.Value);
28.  
29.                     fmodFloatParameter.CurrentValue = floatParameter.Value;
30.                     fmodFloatParameters[i] = fmodFloatParameter;
31.                 }
32.                
33.              }
34.         }
35.     }
36. }
37.  

 

Anyone?...

 

if you get your buffer as a native array (AsNativeArray()) you should be able to write to it.