在C＃中，将接口列表强制转换为对象列表的推荐方法是什么？

Question

I have code that returns and array of IVehicle interface

  IEnumerable<IVehicle> allVehicles = GetAllVehicles();

and I know that all of these objects are Car objects. What is the right way to cast

IEnumerable<IVehicle>

to

IEnumerable<Car>

as i need to pass these into another function that requires <Enumerable<Car>

Answer 1

您可以像这样进行投射：

var allCars = allVehicles.Cast<Car>();

Answer 2

I'm not sure if that's actually what's needed, but it can be done using a Linq extension method as follows.

IEnumerable<Car> Cars = allVehicles.Cast<Car>();

However this will throw an exception if one of the members in allVehicles is not a Car ; if desired, this can be circumvented as follows.

IEnumerable<Car> Cars = allVehicles.OfType<Car>().Cast<Car>();