Util/MyClass/ObservableCollectionEx.cs

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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;

namespace Util.MyClass
{
    /// <summary>
    /// Expanded ObservableCollection to include some List<T> Methods
    /// </summary>
    [Serializable]
    public class ObservableCollectionEx<T> : ObservableCollection<T>
    {

        /// <summary>
        /// Constructors
        /// </summary>
        public ObservableCollectionEx() : base() { }
        public ObservableCollectionEx(List<T> l) : base(l) { }
        public ObservableCollectionEx(IEnumerable<T> l) : base(l) { }

        #region Sorting

        /// <summary>
        /// Sorts the items of the collection in ascending order according to a key.
        /// </summary>
        /// <typeparam name="TKey">The type of the key returned by <paramref name="keySelector"/>.</typeparam>
        /// <param name="keySelector">A function to extract a key from an item.</param>
        public void Sort<TKey>(Func<T, TKey> keySelector)
        {
            InternalSort(Items.OrderBy(keySelector));
        }

        /// <summary>
        /// Sorts the items of the collection in descending order according to a key.
        /// </summary>
        /// <typeparam name="TKey">The type of the key returned by <paramref name="keySelector"/>.</typeparam>
        /// <param name="keySelector">A function to extract a key from an item.</param>
        public void SortDescending<TKey>(Func<T, TKey> keySelector)
        {
            InternalSort(Items.OrderByDescending(keySelector));
        }

        /// <summary>
        /// Sorts the items of the collection in ascending order according to a key.
        /// </summary>
        /// <typeparam name="TKey">The type of the key returned by <paramref name="keySelector"/>.</typeparam>
        /// <param name="keySelector">A function to extract a key from an item.</param>
        /// <param name="comparer">An <see cref="IComparer{T}"/> to compare keys.</param>
        public void Sort<TKey>(Func<T, TKey> keySelector, IComparer<TKey> comparer)
        {
            InternalSort(Items.OrderBy(keySelector, comparer));
        }

        /// <summary>
        /// Moves the items of the collection so that their orders are the same as those of the items provided.
        /// </summary>
        /// <param name="sortedItems">An <see cref="IEnumerable{T}"/> to provide item orders.</param>
        private void InternalSort(IEnumerable<T> sortedItems)