如何从IronPython脚本将Lambda表达式传递给C#构造函数? [英] How to pass a lambda expression to a C# constructor from an IronPython script?

问题描述

我正在将IronPython编写引擎集成到我的C#raytracer中，到目前为止，尽管我是Python的新手，但仍然很容易.但是，有一件事我需要帮助.我有一个C#类，它定义了一个像这样的构造函数:

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)

在C#中，我将这样实例化:

In C#, I would instantiate this like so:

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

我不太清楚如何在IronPython中为Action对象进行类似的分配，所以Python语法看起来如何?

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?

推荐答案

假设我解释了此权利，并且Action是泛型委托，则可以进行以下工作(包括我使用的存根).

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);
    }
    }
 }

我已更正以上内容以使用System.Action，并且不再需要显式反射.不过有点奇怪.由于某种原因，我可以构造一个用户创建的委托，例如:

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);

但不能通过System.Action来执行.例如.

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

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

explicitSystemAction为空. TestAction的定义为:

explicitSystemAction is null. TestAction was just defined as:

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

但是幸运的是，做这件事很好:

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

CameraAnimation(System.Action) 

或

CameraAnimation(TestAction)

尽管出于某种原因，我不记得我第一次尝试时能正常工作...

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

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