public class ReadOnlyDictionary<TKey, TValue> : IDictionary<TKey, TValue>
{
    #region Private Fields

    private IDictionary<TKey, TValue> _original;

    #endregion

    #region Constructors

    public ReadOnlyDictionary(IDictionary<TKey, TValue> original)
    {
        _original = original;
    }

    #endregion

    #region IDictionary<TKey,TValue> Members

    public void Add(TKey key, TValue value)
    {
        throw new NotSupportedException();
    }

    public bool ContainsKey(TKey key)
    {
        return _original.ContainsKey(key);
    }

    public ICollection<TKey> Keys
    {
        get { return _original.Keys; }
    }

    public bool Remove(TKey key)
    {
        throw new NotSupportedException();
    }

    public bool TryGetValue(TKey key, out TValue value)
    {
        return _original.TryGetValue(key, out value);
    }

    public ICollection<TValue> Values
    {
        get { return _original.Values; }
    }

    public TValue this[TKey key]
    {
        get
        {
            return _original[key];
        }
        set
        {
            throw new NotSupportedException();
        }
    }

    #endregion

    #region ICollection<KeyValuePair<TKey,TValue>> Members

    public void Add(KeyValuePair<TKey, TValue> item)
    {
        throw new NotSupportedException();
    }

    public void Clear()
    {
        throw new NotSupportedException();
    }

    public bool Contains(KeyValuePair<TKey, TValue> item)
    {
        return _original.Contains(item);
    }

    public void CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex)
    {
        _original.CopyTo(array, arrayIndex);
    }

    public int Count
    {
        get { return _original.Count; }
    }

    public bool IsReadOnly
    {
        get { return true; }
    }

    public bool Remove(KeyValuePair<TKey, TValue> item)
    {
        throw new NotSupportedException();
    }

    #endregion

    #region IEnumerable<KeyValuePair<TKey,TValue>> Members

    public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
    {
        return _original.GetEnumerator();
    }

    #endregion

    #region IEnumerable Members

    System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
    {
        return _original.GetEnumerator();
    }

    #endregion
}

public class ReadOnlyList<T> : IList<T>
{
    #region Private Fields

    private IList<T> _original;

    #endregion

    #region Constructors

    public ReadOnlyList(IList<T> original)
    {
        _original = original;
    }

    #endregion

    #region IList<T> Members

    public int IndexOf(T item)
    {
        return _original.IndexOf(item);
    }

    public void Insert(int index, T item)
    {
        throw new NotSupportedException();
    }

    public void RemoveAt(int index)
    {
        throw new NotSupportedException();
    }

    public T this[int index]
    {
        get
        {
            return _original[index];
        }
        set
        {
            throw new NotSupportedException();
        }
    }

    #endregion

    #region ICollection<T> Members

    public void Add(T item)
    {
        throw new NotSupportedException();
    }

    public void Clear()
    {
        throw new NotSupportedException();
    }

    public bool Contains(T item)
    {
        return _original.Contains(item);
    }

    public void CopyTo(T[] array, int arrayIndex)
    {
        _original.CopyTo(array, arrayIndex);
    }

    public int Count
    {
        get { return _original.Count; }
    }

    public bool IsReadOnly
    {
        get { return true; }
    }

    public bool Remove(T item)
    {
        throw new NotSupportedException();
    }

    #endregion

    #region IEnumerable<T> Members

    public IEnumerator<T> GetEnumerator()
    {
        return _original.GetEnumerator();
    }

    #endregion

    #region IEnumerable Members

    System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
    {
        return _original.GetEnumerator();
    }

    #endregion
}