ModelMeshPartCollection.cs

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
 
namespace Microsoft.Xna.Framework.Graphics;
 
public sealed class ModelMeshPartCollection : ReadOnlyCollection<ModelMeshPart>
{
    public struct Enumerator : IEnumerator<ModelMeshPart>, IDisposable, IEnumerator
    {
        private ModelMeshPart[] wrappedArray;
 
        private int position;
 
        public ModelMeshPart Current => wrappedArray[position];
 
        object IEnumerator.Current => Current;
 
        internal Enumerator(ModelMeshPart[] wrappedArray)
        {
            this.wrappedArray = wrappedArray;
            position = -1;
        }
 
        public bool MoveNext()
        {
            position++;
            if (position >= wrappedArray.Length)
            {
                position = wrappedArray.Length;
                return false;
            }
            return true;
        }
 
        void IEnumerator.Reset()
        {
            position = -1;
        }
 
        public void Dispose()
        {
        }
    }
 
    private ModelMeshPart[] wrappedArray;
 
    internal ModelMeshPartCollection(ModelMeshPart[] parts)
        : base((IList<ModelMeshPart>)parts)
    {
        wrappedArray = parts;
    }
 
    public new Enumerator GetEnumerator()
    {
        return new Enumerator(wrappedArray);
    }
}