How can I convert IEnumerable<object> to List<IFoo> where each object is an IFoo?

问题

How can I convert IEnumerable<object> to List<IFoo> where each object is an IFoo?

I have an IEnumerable<object>, someCollection, and each item in someCollection is an IFoo instance. How can I convert someCollection into a List<IFoo>? Can I use convert or cast or something instead of looping through and building up a list?

回答1:

Using LINQ, you can use Cast to cast the items, and use ToList to get a list.

Try:

 IEnumerable<object> someCollection; //Some enumerable of object.
 var list = someCollection.Cast<IFoo>().ToList();

回答2:

someCollection.Cast<IFoo>().ToList()

回答3:

Try this:

enumerable.Cast<IFoo>().ToList();

来源：https://stackoverflow.com/questions/10855836/how-can-i-convert-ienumerableobject-to-listifoo-where-each-object-is-an-ifoo