Question

I’m having trouble figuring out how to get Powershell to call an indexer on my class. The class looks something like this (vastly simplified):

public interface IIntCounters
{
    int this[string counterName] { get; set; }
}

public class MyClass : IIntCounters
{
    public IIntCounters Counters { get { return this; } }

    int IIntCounters.this[string counterName]
        { get { ...return something... } }
}

If I new up this class I can’t just use the bracket operator on it – I get an “unable to index” error. I also tried using get_item(), which is what Reflector shows me the indexer ultimately becomes in the assembly, but that gets me a “doesn’t contain a method named get_item” error.

UPDATE: this appears specific to my use of explicit interfaces. So my new question is: is there a way to get Powershell to see the indexer without switching away from explicit interfaces? (I really don’t want to modify this assembly if possible.)

Answer 1

This works for me (uses reflection):

$obj = new-object MyClass
$p = [IIntCounters].GetProperty("Item")
$p.GetValue($obj, @("counterName"))