I found something surprising today..

I was seeing this code which was trying to remove an item from a list. This list object was derived from List<T> and did not override the collection based methods.

I noticed that the original code did not remove the item from the list even though it tried to:

listObject.Remove(listObject.Find(delegate(listItemObject p) { return p.MyProperty == x.MyProperty && p.MyProperty2 == x.MyProperty2; }));

This looked fishy, so I changed this code to use LINQ to objects to get a list of items to remove and then I removed the items one by one inside a for loop just to see whether it would work or not.

Surprise Surprise! - It did not work.

Finally, I had to use the RemoveAll() method passing in this condition as an anonymous method to make the code remove it.

I could not understand why it would not remove the item when I called remove on an object which I got from within the list itself.

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