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