ReadOnlyList.cs

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namespace System.Collections.Specialized;
 
internal sealed class ReadOnlyList : IList, ICollection, IEnumerable
{
    private readonly IList _list;
 
    public int Count => _list.Count;
 
    public bool IsReadOnly => true;
 
    public bool IsFixedSize => true;
 
    public bool IsSynchronized => _list.IsSynchronized;
 
    public object this[int index]
    {
        get
        {
            return _list[index];
        }
        set
        {
            throw new NotSupportedException(System.SR.NotSupported_ReadOnlyCollection);
        }
    }
 
    public object SyncRoot => _list.SyncRoot;
 
    internal ReadOnlyList(IList list)
    {
        _list = list;
    }
 
    public int Add(object value)
    {
        throw new NotSupportedException(System.SR.NotSupported_ReadOnlyCollection);
    }
 
    public void Clear()
    {
        throw new NotSupportedException(System.SR.NotSupported_ReadOnlyCollection);
    }
 
    public bool Contains(object value)
    {
        return _list.Contains(value);
    }
 
    public void CopyTo(Array array, int index)
    {
        _list.CopyTo(array, index);
    }
 
    public IEnumerator GetEnumerator()
    {
        return _list.GetEnumerator();
    }
 
    public int IndexOf(object value)
    {
        return _list.IndexOf(value);
    }
 
    public void Insert(int index, object value)
    {
        throw new NotSupportedException(System.SR.NotSupported_ReadOnlyCollection);
    }
 
    public void Remove(object value)
    {
        throw new NotSupportedException(System.SR.NotSupported_ReadOnlyCollection);
    }
 
    public void RemoveAt(int index)
    {
        throw new NotSupportedException(System.SR.NotSupported_ReadOnlyCollection);
    }
}