用IronPython在C中运行特定的Python函数

Question

到目前为止，我有一个简单的类，它包装了一个python引擎（IronPython）供我使用。虽然代码看起来很大，但其实很简单，所以我将其复制到这里，以便更清楚地说明我的问题。

代码如下：

public class PythonInstance
{
    ScriptEngine engine;
    ScriptScope scope;
    ScriptSource source;

    public PythonInstance()
    {
        engine = Python.CreateEngine();
        scope = engine.CreateScope();
    }

    public void LoadCode(string code)
    {
        source = engine.CreateScriptSourceFromString(code, Microsoft.Scripting.SourceCodeKind.Statements);
        source.Compile();
    }

    public void SetVariable(string key, dynamic variable)
    {
        scope.SetVariable(key, variable);
    }

    public void RunCode()
    {
        source.Execute(scope);
    }

    public void CallFunction(string function)
    {
        //?????? no idea what to call here
    }

}

所以，它工作得很好，但它只允许我一次执行所有的python脚本。。。但我想做的是能够从pythos脚本中调用特定的函数。

那么，我的问题是：如何调用加载脚本中的特定函数？

我试图找到一些信息或教程，但不幸的是找不到任何东西。

Answer 1

可以使用ScriptScope.GetVariable获取实际的函数，然后像调用c#函数一样调用它。 像这样使用： C#代码：

var var1,var2=...
ScriptEngine engine = Python.CreateEngine();
ScriptScope scope = engine.CreateScope();
engine.ExecuteFile(@"C:\test.py", scope);
dynamic testFunction = scope.GetVariable("test_func");
var result = testFunction(var1,var2);

Python代码：

def test_func(var1,var2):
    ...do something...

我花了一段时间才弄明白，很简单。。可惜没有好的IronPython文档。希望这有帮助：）

Answer 2

多亏了评论中的建议，我才知道如何使用它。我现在有：

public class PythonInstance
{
    private ScriptEngine engine;
    private ScriptScope scope;
    private ScriptSource source;
    private CompiledCode compiled;
    private object pythonClass;

    public PythonInstance(string code, string className = "PyClass")
    {
        //creating engine and stuff
        engine = Python.CreateEngine();
        scope = engine.CreateScope();

        //loading and compiling code
        source = engine.CreateScriptSourceFromString(code, Microsoft.Scripting.SourceCodeKind.Statements);
        compiled = source.Compile();

        //now executing this code (the code should contain a class)
        compiled.Execute(scope);

        //now creating an object that could be used to access the stuff inside a python script
        pythonClass = engine.Operations.Invoke(scope.GetVariable(className));
    }

    public void SetVariable(string variable, dynamic value)
    {
        scope.SetVariable(variable, value);
    }

    public dynamic GetVariable(string variable)
    {
        return scope.GetVariable(variable);
    }

    public void CallMethod(string method, params dynamic[] arguments)
    {
        engine.Operations.InvokeMember(pythonClass, method, arguments);
    }

    public dynamic CallFunction(string method, params dynamic[] arguments)
    {
        return engine.Operations.InvokeMember(pythonClass, method, arguments);
    }

}

要测试它：

        PythonInstance py = new PythonInstance(@"
class PyClass:
    def __init__(self):
        pass

    def somemethod(self):
        print 'in some method'

    def isodd(self, n):
        return 1 == n % 2
");
        py.CallMethod("somemethod");
        Console.WriteLine(py.CallFunction("isodd", 6));