IObservableVectorの実装クラスって？

もしかして無い？こんなの毎回実装するなんて、信じられないよ。本番までには出てきて！

namespace Application3.Common
{
    using System.Collections.Generic;
    using System.Linq;
    using Windows.Foundation.Collections;

    class ObservableVector<T> : IObservableVector<T>
    {
        private List<T> inner;

        public ObservableVector() : this(Enumerable.Empty<T>())
        {
        }

        public ObservableVector(IEnumerable<T> source)
        {
            this.inner = new List<T>(source);
        }

        public event VectorChangedEventHandler<T> VectorChanged;
        private void RaiseVectorChanged(CollectionChange collectionChange, int index)
        {
            var h = this.VectorChanged;
            if (h != null)
            {
                h(this, new VectorChangedEventArgs { CollectionChange = collectionChange, Index = (uint)index });
            }
        }

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

        public void Insert(int index, T item)
        {
            this.inner.Insert(index, item);
            this.RaiseVectorChanged(CollectionChange.ItemInserted, index);
        }

        public void RemoveAt(int index)
        {
            this.inner.RemoveAt(index);
            this.RaiseVectorChanged(CollectionChange.ItemRemoved, index);
        }

        public T this[int index]
        {
            get
            {
                return this.inner[index];
            }
            set
            {
                this.inner[index] = value;
                this.RaiseVectorChanged(CollectionChange.ItemChanged, index);
            }
        }

        public void Add(T item)
        {
            this.inner.Add(item);
            this.RaiseVectorChanged(CollectionChange.ItemInserted, this.inner.Count - 1);
        }

        public void Clear()
        {
            this.inner.Clear();
            this.RaiseVectorChanged(CollectionChange.Reset, 0);
        }

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

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

        public int Count
        {
            get { return this.inner.Count; }
        }

        public bool IsReadOnly
        {
            get { return false; }
        }

        public bool Remove(T item)
        {
            var index = this.inner.IndexOf(item);
            if (index == -1)
            {
                return false;
            }
            this.RemoveAt(index);
            return true;
        }

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

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

        class VectorChangedEventArgs : IVectorChangedEventArgs
        {
            public CollectionChange CollectionChange { get; set; }
            public uint Index { get; set; }
        }

    }
}