@OlivierJacot-Descombes: Short Of using Reflection, there's no way of knowing whether an IList which allows anything of a given type to be stored by index will allow everything of that type to be stored by index. Down Below I took part of a code I was looking at. I don't https://cobjectkullanm08439.blogerus.com/50712192/c-ienumerable-kullanımı-seçenekler