ReadOnlyReactiveCollection.cs

using DynamicData.Binding;
using ReactiveUI;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;

namespace WwtbamOld;

public abstract class ReadOnlyReactiveCollection<T> : ReactiveObject, IEnumerable<T>
{
    #region Fields

    protected readonly ObservableCollectionExtended<T> _collection;
    protected readonly ReadOnlyObservableCollection<T> _readOnlyCollection;

    #endregion Fields

    public ReadOnlyReactiveCollection()
    {
        _readOnlyCollection = new ReadOnlyObservableCollection<T>(_collection = new ObservableCollectionExtended<T>());
    }

    #region Properties

    public ReadOnlyObservableCollection<T> Collection => _readOnlyCollection;

    #endregion Properties

    public T this[int id] => _readOnlyCollection[id];

    #region IEnumerable<T>

    public IEnumerator<T> GetEnumerator() => ((IEnumerable<T>)_readOnlyCollection).GetEnumerator();

    IEnumerator IEnumerable.GetEnumerator() => ((IEnumerable)_readOnlyCollection).GetEnumerator();

    #endregion IEnumerable<T>
}