c# - Does Class need to implement IEnumerable to use Foreach

Question

This is in C#, I have a class that I am using from some else's DLL. It does not implement IEnumerable but has 2 methods that pass back a IEnumerator. Is there a way I can use a foreach loop on these. The class I am using is sealed.

Answer 1

foreach does not require IEnumerable, contrary to popular belief. All it requires is a method GetEnumerator that returns any object that has the method MoveNext and the get-property Current with the appropriate signatures.

/EDIT: In your case, however, you're out of luck. You can trivially wrap your object, however, to make it enumerable:

class EnumerableWrapper {
    private readonly TheObjectType obj;

    public EnumerableWrapper(TheObjectType obj) {
        this.obj = obj;
    }

    public IEnumerator<YourType> GetEnumerator() {
        return obj.TheMethodReturningTheIEnumerator();
    }
}

// Called like this:

foreach (var xyz in new EnumerableWrapper(yourObj))
    …;

/EDIT: The following method, proposed by several people, does not work if the method returns an IEnumerator:

foreach (var yz in yourObj.MethodA())
    …;