update

ConcurrentList.cs

@@ -0,0 +1,104 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AutoSellerNS
+{
+	public class ConcurrentList<T> : ConcurrentDictionary<int, T>, IList<T>
+	{
+		int m_Order = 0;
+
+		public T this[int index]
+		{
+			get
+			{
+				T value;
+				if (ContainsKey(index) == true)
+				{
+					TryGetValue(index, out value);
+					return value;
+				}
+				else
+				{
+					throw new IndexOutOfRangeException();
+				}
+			}
+
+			set
+			{
+				AddOrUpdate(index, value, (k, v) => value);
+			}
+		}
+
+		public bool IsReadOnly
+		{
+			get
+			{
+				return false;
+			}
+		}
+
+		public void Add(T item)
+		{
+			TryAdd(m_Order++, item);
+		}
+
+		public bool Contains(T item)
+		{
+			return Contains(item);
+		}
+
+		public void CopyTo(T[] array, int arrayIndex)
+		{
+			throw new NotImplementedException();
+		}
+
+		public int IndexOf(T item)
+		{
+			foreach(var kv in this)
+			{
+				if (kv.Value.Equals(item))
+					return kv.Key;
+			}
+
+			return -1;
+		}
+
+		public void Insert(int index, T item)
+		{
+			if(index < 0 || index >= m_Order)
+				throw new ArgumentOutOfRangeException();
+
+			this[index] = item;
+		}
+
+		public bool Remove(T item)
+		{
+			int index = IndexOf(item);
+			if (index < 0)
+				return false;
+
+			this[index] = default(T);
+			return true;
+		}
+
+		public void RemoveAt(int index)
+		{
+			if (index < 0 || ContainsKey(index) == false)
+				throw new ArgumentOutOfRangeException();
+
+			this[index] = default(T);
+		}
+
+		IEnumerator<T> IEnumerable<T>.GetEnumerator()
+		{
+			foreach(var kv in this)
+			{
+				yield return kv.Value;
+			}
+		}
+	}
+}