添加一个numberof用于访问特定索引下的索引器对象，不过这个有意义吗？

Runtime/MicroLibrary/MacroList.cs

@@ -166,6 +166,24 @@ namespace XericLibrary.Runtime.MacroLibrary
 
 		#endregion
 
+		#region LinQ<EFBFBD><EFBFBD>չ
 
+		/// <summary>
+		/// <20><>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD>µĵ<C2B5><C4B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+		/// </summary>
+		/// <typeparam name="T"></typeparam>
+		/// <param name="list"></param>
+		/// <param name="index"></param>
+		/// <returns><3E><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD><D4AD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><C3BB><EFBFBD>ҵ<EFBFBD><D2B5><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD>Ĭ<EFBFBD><C4AC></returns>
+		public static T NumberOf<T>(this IEnumerable<T> list, int index)
+		{
+			var count = index;
+			foreach(var item in list)
+				if(0 < --count)
+					return item;
+			return default(T);
+		}
+
+		#endregion
 	}
 }