How to pass a lambda expression to a C# constructor from an IronPython script?

I'm integrating an IronPython scritping engine into my C# raytracer which, so far, has been a breeze even though I'm completely new to Python. There is one particular thing, though, that I need help with. I have a C# class which defines a constructor like this:

public CameraAnimation(Action<Camera, float> animation)

In C#, I would instantiate this like so:

var camAnimation = new CameraAnimation((camera, time) => camera.Position += new Vector(1, 0, 0));

I can't quite figure out how to make a similar assignment for the Action object in IronPython, so how would the Python syntax look?

From stackoverflow

• Assuming I interpreted this right, and Action is a generic delegate, the below works (the stubs I used are included).

  Python:

  import clr
  clr.AddReference("IronPythonDelegates")
  
  import IronPythonDelegates
  
  def camActionPy(camera, time):
    print "Camera: " + str(camera) + ", time: " + str(time)
  
  IronPythonDelegates.CameraAnimation(camActionPy);
  

  CSharp:

  namespace IronPythonDelegates
  {
      public class Camera{}
  
      public class CameraAnimation
      {
      private System.Action<Camera, float> animation;
  
      public CameraAnimation(System.Action<Camera, float> animation)
      {
          this.animation = animation;
          this.animation(new Camera(), 1.5f);
      }
      }
   }
  

  I corrected the above to use System.Action, and it no longer requires explicit reflection. It's a bit weird though. For some reason, I could construct a user-created delegate like:

  explicitTestAction = IronPythonDelegates.TestAction[IronPythonDelegates.Camera, System.Single](camActionPy);
  IronPythonDelegates.CameraAnimation(explicitTestAction);
  

  but could not do so with System.Action. E.g. with

  explicitSystemAction = System.Action[IronPythonDelegates.Camera, System.Single](camActionPy)
  IronPythonDelegates.CameraAnimation(explicitSystemAction);
  

  explicitSystemAction is null. TestAction was just defined as:

  public delegate void TestAction(T1 one, T2 two);

  But luckily either way it's fine to just do:

  CameraAnimation(System.Action) or CameraAnimation(TestAction)

  though for some reason I don't remember that working when I first tried...

  Matthew Flaschen : Note, I found System.Action, but unfortunately changing it to use that inexplicably broke the code... Looking at it now.

  srivatsn : Did you add a reference to System.Core.dll? System.Action is defined in mscorlib but System.Action is defined in System.Core.

  Matthew Flaschen : Yes, I have a reference to System.Core. As noted, I have it working now.