Question

Is there a way in c# to do something like this:

public void Foo<T>()
{
    T[] arr = Goo() as T[];
}

Where Goo returns an object[], Using reflection or whatever?

Answer 1

You could use LINQ:

public void Foo<T>()
{
    T[] arr = Goo().OfType<T>().ToArray();
}

In your example you are casting the object[] to T[] which will also work if the two types match exactly:

public void Foo<T>()
{
    T[] arr = Goo() as T[];
    if (arr != null)
    {
        // use the array
    }
}

For example this will work in the following case:

public object[] Goo()
{
    return new string[] { "a", "b" };
}

and then calling Foo like this:

Foo<string>();