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

		private void AssertIsValidArray(object instance, string property, int index)
		{
			Type instanceType = instance.GetType();

			IList list = instance as IList;

			bool validList = false;

			if (list == null && instanceType.IsGenericType)
			{
				Type[] genArgs = instanceType.GetGenericArguments();

				Type genList = typeof(System.Collections.Generic.IList<>).MakeGenericType(genArgs);
				Type genTypeDef = instanceType.GetGenericTypeDefinition().MakeGenericType(genArgs);

				validList = genList.IsAssignableFrom(genTypeDef);
			}
			
			if (!validList && list == null)
			{
				throw new RailsException("The property {0} is being accessed as " + 
					"an indexed property but does not seem to implement IList. " + 
					"In fact the type is {1}", property, instanceType.FullName);
			}

			if (index < 0)
			{
				throw new RailsException("The specified index '{0}' is outside the bounds " + 
					"of the array. Property {1}", index, property);
			}
		}