ReadOnlyCollectionBase.cs

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namespace System.Collections;
 
public abstract class ReadOnlyCollectionBase : ICollection, IEnumerable
{
    private ArrayList _list;
 
    protected ArrayList InnerList
    {
        get
        {
            if (_list == null)
            {
                _list = new ArrayList();
            }
            return _list;
        }
    }
 
    public virtual int Count => InnerList.Count;
 
    bool ICollection.IsSynchronized => InnerList.IsSynchronized;
 
    object ICollection.SyncRoot => InnerList.SyncRoot;
 
    void ICollection.CopyTo(Array array, int index)
    {
        InnerList.CopyTo(array, index);
    }
 
    public virtual IEnumerator GetEnumerator()
    {
        return InnerList.GetEnumerator();
    }
}