如何将动态列表从 IronPython 传递到 C#

Question

我想要一个 python 应用程序来将通用列表传递到我的 C# 代码。我创建了一个演示应用程序来重现我遇到的问题。

我有这个 python 代码 (Python 2.7)，MainApp.py，它调用 C# DLL (.NET 4.7)：

import clr, sys

sys.path.append(r"C:\PathToMyProject\ClassLibrary1\bin\Debug")
clr.AddReference(r"C:\PathToMyProject\ClassLibrary1\bin\Debug\ClassLibrary1.dll")

from ClassLibrary1 import Class1

class Person:
    def __init__(self, Name):
        self.Name = Name


myclass = Class1()

nameList = []
nameList.append(Person("Joe"))
nameList.append(Person("Mary"))
nameList.append(Person("Chris"))

result = myclass.SayHello(nameList)

print(result)

请注意，我有一个 Person 个对象的列表，nameList，我正试图通过。这是 C# 代码：

using System.Collections.Generic;

namespace ClassLibrary1
{
    public class Class1
    {
        public string SayHello(List<dynamic> names)
        {
            return $"Hello, {names.Count} people!";
        }
    }
}

SayHello方法接受一个参数List<dynamic>。但是，当运行 >python MainApp.py:

时，我收到以下错误

Traceback (most recent call last): File ".\MainApp.py", line 20, in result = myclass.SayHello(nameList) TypeError: No method matches given arguments for SayHello: (<type 'list'>)

Answer 1

我用下面的代码解决了：

MainApp.py:

import clr, sys

sys.path.append(r"C:\Projects\temp\ClassLibrary1\bin\Debug")
clr.AddReference(r"C:\Projects\temp\ClassLibrary1\bin\Debug\ClassLibrary1.dll")

from ClassLibrary1 import Class1
from ClassLibrary1 import Person

myclass = Class1()

nameList = []
nameList.append(Person("Joe"))
nameList.append(Person("Mary"))
nameList.append(Person("Chris"))

result = myclass.SayHello(nameList)

print(result)

Class1.cs:

namespace ClassLibrary1
{
    public class Class1
    {
        public string SayHello(dynamic[] names)
        {
            foreach (var item in names)
            {
                System.Console.WriteLine(item.Name);
            }

            return $"Hello, {names.Length} people!";
        }
    }

    public class Person
    {
        public Person(string name)
        {
            Name = name;
        }

        public string Name { get; set; }
    }
}

我做的第一件事是将 SayHello 参数类型从 List<dynamic> 更改为 dynamic[]。

public string SayHello(dynamic[] names)

这修复了类型错误，但我开始收到一条新消息：

Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at Python.Runtime.Runtime.PyObject_GetAttrString(IntPtr pointer, String name) at Python.Runtime.PyObject.GetAttr(String name) at Python.Runtime.PyObject.TryGetMember(GetMemberBinder binder, Object& result) at CallSite.Target(Closure , CallSite , Object ) at System.Dynamic.UpdateDelegates.UpdateAndExecute1[T0,TRet](CallSite site, T0 arg0) at ClassLibrary1.Class1.SayHello(Object[] names) in C:\Projects\csharp-nine-cookbook\csharp-nine-cookbook\CSharp9Cookbook\ClassLibrary1\Class1.cs:line 11 --- End of inner exception stack trace --- at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at Python.Runtime.MethodBinder.Invoke(IntPtr inst, IntPtr args, IntPtr kw, MethodBase info, MethodInfo[] methodinfo) at Python.Runtime.MethodObject.Invoke(IntPtr target, IntPtr args, IntPtr kw, MethodBase info) at Python.Runtime.MethodBinding.tp_call(IntPtr ob, IntPtr args, IntPtr kw)

显然 IronPython 不允许我将自定义类型从 python 传递到 C#。为了解决这个问题，我在 C# 代码中添加了 Person class：

public class Person
{
    public Person(string name)
    {
        Name = name;
    }

    public string Name { get; set; }
}

然后我从 python 代码中删除了自定义 Person class 并引用了 C# 代码中的那个：

from ClassLibrary1 import Person

之后一切正常。

如何将动态列表从 IronPython 传递到 C#

How to pass a dynamic list from IronPython to C#

c#

python

ironpython

dynamic-language-runtime