_Core/Collections/DictionaryOrdered.cs

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/*
 * Author: Kishore Reddy
 * Url: http://commonlibrarynet.codeplex.com/
 * Title: CommonLibrary.NET
 * Copyright: � 2009 Kishore Reddy
 * License: LGPL License
 * LicenseUrl: http://commonlibrarynet.codeplex.com/license
 * Description: A C# based .NET 3.5 Open-Source collection of reusable components.
 * Usage: Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Collections;
using System.Collections.Generic;


namespace ComLib
{
    /// <summary>
    /// This class implements an ordered dictionary.
    /// </summary>
    /// <typeparam name="TKey">Type of dictionary key.</typeparam>
    /// <typeparam name="TValue">Type of dictionary value.</typeparam>
    [Serializable]
    public class DictionaryOrdered<TKey, TValue> :  IDictionary<TKey, TValue>
    {
        #region Private Data members
        private IList<TKey> _list = null;
        private IDictionary<TKey, TValue> _map = null;
        #endregion


        #region Constructors
        /// <summary>
        /// Creates a new instance of this class
        /// without any key/value pairs.
        /// </summary>
        public DictionaryOrdered()
        {
            _list = new List<TKey>();
            _map = new Dictionary<TKey, TValue>();
        }
        #endregion


        #region IDictionary<TKey,TValue> Members
        /// <summary>
        /// Add to key/value for both forward and reverse lookup.
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public void Add(TKey key, TValue value)
        {
            // Add to map and list.
            _map.Add(key, value);
            _list.Add(key);
        }