Castle.MonoRail.Framework.Helpers.FormHelper.GetArrayElement C# (CSharp) Method

		private static object GetArrayElement(object instance, int index)
		{
			IList list = instance as IList;

			if (list == null && instance != null && instance.GetType().IsGenericType)
			{
				Type instanceType = instance.GetType();

				Type[] genArguments = instanceType.GetGenericArguments();

				Type genType = instanceType.GetGenericTypeDefinition().MakeGenericType(genArguments);
				
				// I'm not going to retest for IList implementation as 
				// if we got here, the AssertIsValidArray has run successfully

				PropertyInfo countPropInfo = genType.GetProperty("Count");

				int count = (int) countPropInfo.GetValue(instance, null);
				
				if (count == 0 || index + 1 > count)
				{
					return null;
				}

				PropertyInfo indexerPropInfo = genType.GetProperty("Item");

				return indexerPropInfo.GetValue(instance, new object[] { index });
			}
			
			if (list == null || list.Count == 0 || index + 1 > list.Count)
			{
				return null;
			}

			return list[index];
		}