[英]How to pass python callback to c# function call
I am trying to use C# classes from python, using python.net on mono / ubuntu. 我正在尝试使用python中的C#类,在mono / ubuntu上使用python.net。
So far I managed to do a simple function call with one argument work. 到目前为止,我设法用一个参数工作做一个简单的函数调用。 What I am now trying to do is pass a python callback to the C# function call. 我现在要做的是将python回调传递给C#函数调用。
I tried the following variations below, none worked. 我在下面尝试了以下变化,没有效果。 Can someone show how to make that work? 有人可以展示如何使这项工作?
// 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 script 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)
Try to pass Action
or Func
instead of just raw function: 尝试传递Action
或Func
而不仅仅是原始函数:
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. 我在这里使用IronPython(因为现在我没有在我的任何机器上安装单声道,但根据Python.NET 文档,我认为它应该工作实际上你的代码几乎没问题,但你需要导入Action
或Func
委托取决于什么你需要。
python code: python代码:
import clr
from types import *
from System import Action
clr.AddReferenceToFileAndPath(r"YourPath\TestLib.dll")
import TestLib
print("Hello")
mc = TestLib.MC()
print(mc.method1(10))
def f(fakeparam):
print "exec f"
mc.method2(Action[int](f))
This is a console output: 这是一个控制台输出:
Hello
Executing method1
42.0
Executing method2
exec f
Done executing method2
C# code: 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;
}
}
}
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 我再次阅读Python.net 使用Generics的文档,并发现这个Python.NET命名和泛型类型的解析看起来像你需要明确指定参数类型
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). (反射)泛型类型定义(如果存在具有给定基本名称的泛型类型定义,并且没有具有该名称的非泛型类型)。 This generic type definition can be bound into a closed generic type using the [] syntax. 可以使用[]语法将此泛型类型定义绑定到封闭的泛型类型中。 Trying to instantiate a generic type def using () raises a TypeError. 尝试使用()实例化泛型类型def会引发TypeError。
It looks like you should define your Delegate explicitly: 看起来您应该明确定义Delegate:
class MC {
// Define a delegate type
public delegate void Callback();
public double method2(Callback f) {
Console.WriteLine("Executing method2" );
/* ... do f() at some point ... */
/* also tried f.DynamicInvoke() */
Console.WriteLine("Done executing method2" );
}
}
Then from the Python code (this is a rough guess based from the docs ): 然后从Python代码(这是一个基于文档的粗略猜测):
def f():
print "Executing f"
# instantiate a delegate
f2 = testlib.MC.Callback(f)
# use it
mc.method2(f2)
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