如何将python回调传递给c#函数调用 [英] How to pass python callback to c# function call
问题描述
我正在尝试使用 python 中的 C# 类,在 mono/ubuntu 上使用 python.net.
I am trying to use C# classes from python, using python.net on mono / ubuntu.
到目前为止,我设法用一个参数完成了一个简单的函数调用.我现在要做的是将 python 回调传递给 C# 函数调用.
So far I managed to do a simple function call with one argument work. What I am now trying to do is pass a python callback to the C# function call.
我尝试了以下变体,但均无效.有人可以展示如何使其工作吗?
I tried the following variations below, none worked. Can someone show how to make that work?
// C# - testlib.cs
class MC {
public double method1(int n) {
Console.WriteLine("Executing method1" );
/* .. */
}
public double method2(Delegate f) {
Console.WriteLine("Executing method2" );
/* ... do f() at some point ... */
/* also tried f.DynamicInvoke() */
Console.WriteLine("Done executing method2" );
}
}
Python 脚本
import testlib, System
mc = testlib.MC()
mc.method1(10) # that works
def f():
print "Executing f"
mc.method2(f)
# does not know of method2 with that signature, fair enough...
# is this the right way to turn it into a callback?
f2 = System.AssemblyLoad(f)
# no error message, but f does not seem to be invoked
mc.method2(f2)
推荐答案
尝试传递 Action
或 Func
而不仅仅是原始函数:
Try to pass Action
or Func
instead of just raw function:
我在这里使用了 IronPython(因为现在我的任何机器上都没有安装 Mono,但是根据 Python.NET 文档 我认为它应该有效实际上你的代码几乎没问题,但你需要根据你的需要导入 Action
或 Func
委托.
I used IronPython here (because right now I don't have mono installed on any of my machines but according of Python.NET documentation I think it should work
Actually your code is almost ok but you need to import Action
or Func
delegate depends on what you need.
python 代码:
import clr
from types import *
from System import Action
clr.AddReferenceToFileAndPath(r"YourPathTestLib.dll")
import TestLib
print("Hello")
mc = TestLib.MC()
print(mc.method1(10))
def f(fakeparam):
print "exec f"
mc.method2(Action[int](f))
这是一个控制台输出:
Hello
Executing method1
42.0
Executing method2
exec f
Done executing method2
C# 代码:
using System;
namespace TestLib
{
public class MC
{
public double method1(int n)
{
Console.WriteLine("Executing method1");
return 42.0;
/* .. */
}
public double method2(Delegate f)
{
Console.WriteLine("Executing method2");
object[] paramToPass = new object[1];
paramToPass[0] = new int();
f.DynamicInvoke(paramToPass);
Console.WriteLine("Done executing method2");
return 24.0;
}
}
}
我再次阅读了 Python.net 的文档使用泛型,也发现了这个
I read docs for Python.net Using Generics again and also found this Python.NET Naming and resolution of generic types look like you need to specify parameter type explicitly
引自那里:
一个(反射的)泛型类型定义(如果存在泛型类型定义与给定的基本名称,并且没有具有该名称的非泛型类型).这种通用类型可以使用 [] 语法将定义绑定到封闭的泛型类型.尝试去使用 () 实例化泛型类型 def 会引发 TypeError.
a (reflected) generic type definition (if there exists a generic type definition with the given base name, and no non-generic type with that name). This generic type definition can be bound into a closed generic type using the [] syntax. Trying to instantiate a generic type def using () raises a TypeError.
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