Extension method not accessible from list of derived type-CodePudding

I'm working on a little practice project for myself and I'm trying to call this extension method in my tests

var days = account.Transactions.PassDays(10, Today);

which gives me this error

CS1929    'List<Transaction>' does not contain a definition for 'PassDays' and the best extension method overload 'PassTime.PassDays(List<Event>, int, DateTime)' requires a receiver of type 'List<Event>'

The using statement is highlighted, the extension method is declared as

public static IEnumerable<Day> PassDays(this List<Event> events, int daysToPass, DateTime startTime)

The List I'm trying to use it on is of a class that derives from the Event class. Everything I've read suggests this should work.

public record Transaction : Event

public record Event : IEvent

CodePudding user response：

using

public static IEnumerable<Day> PassDays(this IEnumerable<IEvent> events, int daysToPass, DateTime startTime)

fixed this. (IEvent was not necessary for this but I made the change in anticipation of it being more useful) maybe someone else can explain why this worked.