ModelBoneCollection.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 ModelBoneCollection : ReadOnlyCollection<ModelBone>
{
    public struct Enumerator : IEnumerator<ModelBone>, IDisposable, IEnumerator
    {
        private ModelBone[] wrappedArray;
 
        private int position;
 
        public ModelBone Current => wrappedArray[position];
 
        object IEnumerator.Current => Current;
 
        internal Enumerator(ModelBone[] 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 ModelBone[] wrappedArray;
 
    public ModelBone this[string boneName]
    {
        get
        {
            if (!TryGetValue(boneName, out var value))
            {
                throw new KeyNotFoundException();
            }
            return value;
        }
    }
 
    internal ModelBoneCollection(ModelBone[] bones)
        : base((IList<ModelBone>)bones)
    {
        wrappedArray = bones;
    }
 
    public bool TryGetValue(string boneName, out ModelBone value)
    {
        if (string.IsNullOrEmpty(boneName))
        {
            throw new ArgumentNullException("boneName");
        }
        int count = base.Items.Count;
        for (int i = 0; i < count; i++)
        {
            ModelBone modelBone = base.Items[i];
            if (string.Compare(modelBone.Name, boneName, StringComparison.Ordinal) == 0)
            {
                value = modelBone;
                return true;
            }
        }
        value = null;
        return false;
    }
 
    public new Enumerator GetEnumerator()
    {
        return new Enumerator(wrappedArray);
    }
}