Cast/Convert IEnumerable to IEnumerable?

Question

The following complies but at run time throws an exception. What I am trying to do is to cast a class PersonWithAge to a class of Person. How do I do this and what is the work around? ``` class Person { public int Id { get; set; } public string Name { get; set; } } class PersonWithAge { public int Id { get; set; } public string Name { get; set; } public int Age { get; set; } } class Program { static void Main(string[] args) { IEnumerable pwa = new List { new PersonWithAge {Id = 1, Name = "name1", Age = 23}, new PersonWithAge {Id = 2, Name = "name2", Age = 32} }; IEnumerable p = pwa.Cast(); foreach (var i in p) { Console.WriteLine(i.Name); } } } ``` EDIT: By the way PersonWithAge will always contain the same properties as Person plus a couple more. EDIT 2 Sorry guys but I should have made this a bit clearer, say I have two db views in a database that contains the same columns but view 2 contains 1 extra field. My model view entities are gen…

Accepted Answer

You can't cast because they are different types. You have two choices:

1) Change the class so that PersonWithAge inherits from person.

```
class PersonWithAge : Person
{
        public int Age { get; set; }
}
```

2) Create new objects:

```
IEnumerable<Person> p = pwa.Select(p => new Person { Id = p.Id, Name = p.Name });
```

Cast/Convert IEnumerable<T> to IEnumerable<U>?

Solution

Problem