如何使Linq扩展方法在ObservableCollection上可用<T>

Question

I've written a class that inherits from ObservableCollection<T> . I would like to be able to use the LINQ extensions methods like FirstOrDefault , like what you may get if you inherit from an implementation of IEnumerable<T> , or List<T> . How would I accomplish this?

Answer 1

ObservableCollection is based on Collection which implements IEnumerable. You are probably just missing the using statement.

You might find it useful to use a VS addon like resharper which works all these things out for you, suggests fixes, improvements etc to your code (eg you type .First() and a tooltip appears saying "press alt+enter to add a reference to System.Linq") very very handy. I could never live without it now.